svgedit/editor/svgcanvas.js

/*
 * svgcanvas.js
 *
 * Licensed under the Apache License, Version 2
 *
 * Copyright(c) 2009 Alexis Deveria
 * Copyright(c) 2009 Pavol Rusnak
 * Copyright(c) 2009 Jeff Schiller
 *
 */
/*
	TODOs for TransformList:

	* go through Selector.resize() and rework so that they are always rectangular
	* go through ungrouping again
	* ensure zooming works properly
	* ensure undo/redo works perfectly
*/
/*
	TODOs for Localizing:
	
	- rename tool_path to tool_fhpath in all localization files (already updated in UI and script)
	- rename tool_poly to tool_path in all localization files (already updated in UI and script)
	- rename poly_node_x to path_node_x globally
	- rename poly_node_y to path_node_y globally
	- rename svninfo_dim to svginfo_dim globally (typo)
	- provide translations in all other non-EN lang.XX.js files for:
		- path_node_x
		- path_node_y
		- seg_type
		- straight_segments
		- curve_segments
		- tool_node_clone
		- tool_node_delete
		- selLayerLabel
		- selLayerNames
		- sidepanel_handle
*/
var isWebkit = navigator.userAgent.indexOf("AppleWebKit") != -1;
if(!window.console) {
	window.console = {};
	window.console.log = function(str) {};
	window.console.dir = function(str) {};
}
if( window.opera ) {
	window.console.log = function(str) {opera.postError(str);}
}

// this defines which elements and attributes that we support
// TODO: add <a> elements to this
// TODO: add <marker> to this
// TODO: add <mask> to this
// TODO: add <pattern> to this
// TODO: add <symbol> to this
// TODO: add <tspan> to this
// TODO: add <use> to this
var svgWhiteList = {
	"circle": ["cx", "cy", "fill", "fill-opacity", "fill-rule", "id", "opacity", "r", "requiredFeatures", "stroke", "stroke-dasharray", "stroke-dashoffset", "stroke-linecap", "stroke-linejoin", "stroke-miterlimit", "stroke-opacity", "stroke-width", "systemLanguage", "transform"],
	"defs": [],
	"desc": [],
	"ellipse": ["cx", "cy", "fill", "fill-opacity", "fill-rule", "id", "opacity", "requiredFeatures", "rx", "ry", "stroke", "stroke-dasharray", "stroke-dashoffset", "stroke-linecap", "stroke-linejoin", "stroke-miterlimit", "stroke-opacity", "stroke-width", "systemLanguage", "transform"],
	"g": ["id", "display", "fill", "fill-opacity", "fill-rule", "opacity", "requiredFeatures", "stroke", "stroke-dasharray", "stroke-dashoffset", "stroke-linecap", "stroke-linejoin", "stroke-miterlimit", "stroke-opacity", "stroke-width", "systemLanguage", "transform"],
	"image": ["height", "id", "opacity", "requiredFeatures", "systemLanguage", "transform", "width", "x", "xlink:href", "xlink:title", "y"],
	"line": ["fill", "fill-opacity", "fill-rule", "id", "opacity", "requiredFeatures", "stroke", "stroke-dasharray", "stroke-dashoffset", "stroke-linecap", "stroke-linejoin", "stroke-miterlimit", "stroke-opacity", "stroke-width", "systemLanguage", "transform", "x1", "x2", "y1", "y2"],
	"linearGradient": ["id", "gradientTransform", "gradientUnits", "requiredFeatures", "spreadMethod", "systemLanguage", "x1", "x2", "y1", "y2"],
	"path": ["d", "fill", "fill-opacity", "fill-rule", "id", "opacity", "requiredFeatures", "stroke", "stroke-dasharray", "stroke-dashoffset", "stroke-linecap", "stroke-linejoin", "stroke-miterlimit", "stroke-opacity", "stroke-width", "systemLanguage", "transform"],
	"polygon": ["id", "fill", "fill-opacity", "fill-rule", "id", "opacity", "points", "requiredFeatures", "stroke", "stroke-dasharray", "stroke-dashoffset", "stroke-linecap", "stroke-linejoin", "stroke-miterlimit", "stroke-opacity", "stroke-width", "systemLanguage", "transform"],
	"polyline": ["id", "fill", "fill-opacity", "fill-rule", "opacity", "points", "requiredFeatures", "stroke", "stroke-dasharray", "stroke-dashoffset", "stroke-linecap", "stroke-linejoin", "stroke-miterlimit", "stroke-opacity", "stroke-width", "systemLanguage", "transform"],
	"radialGradient": ["id", "cx", "cy", "fx", "fy", "gradientTransform", "gradientUnits", "r", "requiredFeatures", "spreadMethod", "systemLanguage"],
	"rect": ["fill", "fill-opacity", "fill-rule", "height", "id", "opacity", "requiredFeatures", "rx", "ry", "stroke", "stroke-dasharray", "stroke-dashoffset", "stroke-linecap", "stroke-linejoin", "stroke-miterlimit", "stroke-opacity", "stroke-width", "systemLanguage", "transform", "width", "x", "y"],
	"stop": ["id", "offset", "requiredFeatures", "stop-color", "stop-opacity", "systemLanguage"],
	"switch": ["id", "requiredFeatures", "systemLanguage"],
	"svg": ["id", "height", "requiredFeatures", "systemLanguage", "transform", "viewBox", "width", "xmlns", "xmlns:xlink"],
	"text": ["fill", "fill-opacity", "fill-rule", "font-family", "font-size", "font-style", "font-weight", "id", "opacity", "requiredFeatures", "stroke", "stroke-dasharray", "stroke-dashoffset", "stroke-linecap", "stroke-linejoin", "stroke-miterlimit", "stroke-opacity", "stroke-width", "systemLanguage", "transform", "text-anchor", "x", "xml:space", "y"],
	"title": [],
};

function SvgCanvas(c)
{

var toXml = function(str) {
	return $('<p/>').text(str).html();
};
var fromXml = function(str) {
	return $('<p/>').html(str).text();
};

var pathFuncsStrs = ['Moveto','Lineto','CurvetoCubic','CurvetoQuadratic','Arc','LinetoHorizontal','LinetoVertical','CurvetoCubicSmooth','CurvetoQuadraticSmooth']
var pathFuncs = [0,'ClosePath'];
$.each(pathFuncsStrs,function(i,s){pathFuncs.push(s+'Abs');pathFuncs.push(s+'Rel');});

// These command objects are used for the Undo/Redo stack
// attrs contains the values that the attributes had before the change
function ChangeElementCommand(elem, attrs, text) {
	this.elem = elem;
	this.text = text ? ("Change " + elem.tagName + " " + text) : ("Change " + elem.tagName);
	this.newValues = {};
	this.oldValues = attrs;
	for (attr in attrs) {
		if (attr == "#text") this.newValues[attr] = elem.textContent;
		else this.newValues[attr] = elem.getAttribute(attr);
	}

	this.apply = function() {
		var bChangedTransform = false;
		for( attr in this.newValues ) {
			if (this.newValues[attr]) {
				if (attr == "#text") this.elem.textContent = this.newValues[attr];
				else this.elem.setAttribute(attr, this.newValues[attr]);
			}
			else {
				if (attr == "#text") this.elem.textContent = "";
				else {
					this.elem.setAttribute(attr, "");
					this.elem.removeAttribute(attr);
				}
			}
			if (attr == "transform") { bChangedTransform = true; }
		}
		// relocate rotational transform, if necessary
		if(!bChangedTransform) {
			var angle = canvas.getRotationAngle(elem);
			if (angle) {
				var bbox = elem.getBBox();
				var cx = round(bbox.x + bbox.width/2),
					cy = round(bbox.y + bbox.height/2);
				var rotate = ["rotate(", angle, " ", cx, ",", cy, ")"].join('');
				if (rotate != elem.getAttribute("transform")) {
					elem.setAttribute("transform", rotate);
				}
			}
		}
		// if we are changing layer names, re-identify all layers
		if (this.elem.tagName == "title" && this.elem.parentNode.parentNode == svgcontent) {
			identifyLayers();
		}		
		return true;
	};

	this.unapply = function() {
		var bChangedTransform = false;
		for( attr in this.oldValues ) {
			if (this.oldValues[attr]) {
				if (attr == "#text") this.elem.textContent = this.oldValues[attr];
				else this.elem.setAttribute(attr, this.oldValues[attr]);
			}
			else {
				if (attr == "#text") this.elem.textContent = "";
				else this.elem.removeAttribute(attr);
			}
			if (attr == "transform") { bChangedTransform = true; }
		}
		// relocate rotational transform, if necessary
		if(!bChangedTransform) {
			var angle = canvas.getRotationAngle(elem);
			if (angle) {
				var bbox = elem.getBBox();
				var cx = round(bbox.x + bbox.width/2),
					cy = round(bbox.y + bbox.height/2);
				var rotate = ["rotate(", angle, " ", cx, ",", cy, ")"].join('');
				if (rotate != elem.getAttribute("transform")) {
					elem.setAttribute("transform", rotate);
				}
			}
		}
		// if we are changing layer names, re-identify all layers
		if (this.elem.tagName == "title" && this.elem.parentNode.parentNode == svgcontent) {
			identifyLayers();
		}		
		return true;
	};

	this.elements = function() { return [this.elem]; }
}

function InsertElementCommand(elem, text) {
	this.elem = elem;
	this.text = text || ("Create " + elem.tagName);
	this.parent = elem.parentNode;

	this.apply = function() { 
		this.elem = this.parent.insertBefore(this.elem, this.elem.nextSibling); 
		if (this.parent == svgcontent) {
			identifyLayers();
		}		
	};

	this.unapply = function() {
		this.parent = this.elem.parentNode;
		this.elem = this.elem.parentNode.removeChild(this.elem);
		if (this.parent == svgcontent) {
			identifyLayers();
		}		
	};

	this.elements = function() { return [this.elem]; };
}

function RemoveElementCommand(elem, parent, text) {
	this.elem = elem;
	this.text = text || ("Delete " + elem.tagName);
	this.parent = parent;

	this.apply = function() {
		this.parent = this.elem.parentNode;
		this.elem = this.parent.removeChild(this.elem);
		if (this.parent == svgcontent) {
			identifyLayers();
		}		
	};

	this.unapply = function() { 
		this.elem = this.parent.insertBefore(this.elem, this.elem.nextSibling); 
		if (this.parent == svgcontent) {
			identifyLayers();
		}		
	};

	this.elements = function() { return [this.elem]; };
}

function MoveElementCommand(elem, oldNextSibling, oldParent, text) {
	this.elem = elem;
	this.text = text ? ("Move " + elem.tagName + " to " + text) : ("Move " + elem.tagName);
	this.oldNextSibling = oldNextSibling;
	this.oldParent = oldParent;
	this.newNextSibling = elem.nextSibling;
	this.newParent = elem.parentNode;

	this.apply = function() {
		this.elem = this.newParent.insertBefore(this.elem, this.newNextSibling);
		if (this.newParent == svgcontent) {
			identifyLayers();
		}
	};

	this.unapply = function() {
		this.elem = this.oldParent.insertBefore(this.elem, this.oldNextSibling);
		if (this.oldParent == svgcontent) {
			identifyLayers();
		}
	};

	this.elements = function() { return [this.elem]; };
}

// TODO: create a 'typing' command object that tracks changes in text
// if a new Typing command is created and the top command on the stack is also a Typing
// and they both affect the same element, then collapse the two commands into one

// this command object acts an arbitrary number of subcommands 
function BatchCommand(text) {
	this.text = text || "Batch Command";
	this.stack = [];

	this.apply = function() {
		var len = this.stack.length;
		for (var i = 0; i < len; ++i) {
			this.stack[i].apply();
		}
	};

	this.unapply = function() {
		for (var i = this.stack.length-1; i >= 0; i--) {
			this.stack[i].unapply();
		}
	};

	this.elements = function() {
		// iterate through all our subcommands and find all the elements we are changing
		var elems = [];
		var cmd = this.stack.length;
		while (cmd--) {
			var thisElems = this.stack[cmd].elements();
			var elem = thisElems.length;
			while (elem--) {
				if (elems.indexOf(thisElems[elem]) == -1) elems.push(thisElems[elem]);
			}
		}
		return elems; 
	};

	this.addSubCommand = function(cmd) { this.stack.push(cmd); };

	this.isEmpty = function() { return this.stack.length == 0; };
}

// private members

	// **************************************************************************************
	// FIXME: what's the right way to make this 'class' private to the SelectorManager? 
	function Selector(id, elem) {
		// this is the selector's unique number
		this.id = id;

		// this holds a reference to the element for which this selector is being used
		this.selectedElement = elem;

		// this is a flag used internally to track whether the selector is being used or not
		this.locked = true;

		// this function is used to reset the id and element that the selector is attached to
		this.reset = function(e) {
			this.locked = true;
			this.selectedElement = e;
			this.resize();
			selectorManager.update();
			this.selectorGroup.setAttribute("display", "inline");
		};

		// this holds a reference to the <g> element that holds all visual elements of the selector
		this.selectorGroup = addSvgElementFromJson({ "element": "g",
													"attr": {"id": ("selectorGroup"+this.id)}
													});

		// this holds a reference to the path rect
		this.selectorRect = this.selectorGroup.appendChild( addSvgElementFromJson({
								"element": "path",
								"attr": {
									"id": ("selectedBox"+this.id),
									"fill": "none",
									"stroke": "blue",
									"stroke-width": "1",
									"stroke-dasharray": "5,5",
									// need to specify this so that the rect is not selectable
									"style": "pointer-events:none"
								}
							}) );

		// this holds a reference to the grip elements for this selector
		this.selectorGrips = {	"nw":null,
								"n":null,
								"ne":null,
								"e":null,
								"se":null,
								"s":null,
								"sw":null,
								"w":null
								};
		this.rotateGripConnector = this.selectorGroup.appendChild( addSvgElementFromJson({
							"element": "line",
							"attr": {
								"id": ("selectorGrip_rotateconnector_" + this.id),
								"stroke": "blue",
								"stroke-width": "1"
							}
						}) );
		this.rotateGrip = this.selectorGroup.appendChild( addSvgElementFromJson({
							"element": "circle",
							"attr": {
								"id": ("selectorGrip_rotate_" + this.id),
								"fill": "lime",
								"r": 4,
								"stroke": "blue",
								"stroke-width": 2,
								"style": "cursor:url(images/rotate.png) 12 12, auto;"
							}
						}) );
		
		// add the corner grips
		for (dir in this.selectorGrips) {
			this.selectorGrips[dir] = this.selectorGroup.appendChild( 
				addSvgElementFromJson({
					"element": "circle",
					"attr": {
						"id": ("selectorGrip_resize_" + dir + "_" + this.id),
						"fill": "blue",
						"r": 4,
						"style": ("cursor:" + dir + "-resize"),
						// This expands the mouse-able area of the grips making them
						// easier to grab with the mouse.
						// This works in Opera and WebKit, but does not work in Firefox
						// see https://bugzilla.mozilla.org/show_bug.cgi?id=500174
						"stroke-width": 2,
						"pointer-events":"all",
						"display":"none"
					}
				}) );
		}

		this.showGrips = function(show) {
			// TODO: use suspendRedraw() here
			var bShow = show ? "inline" : "none";
			this.rotateGrip.setAttribute("display", bShow);
			this.rotateGripConnector.setAttribute("display", bShow);
			var elem = this.selectedElement;
			if(elem && (elem.tagName == "text")) bShow = "none";// || elem.tagName == "g")) bShow = "none";
			for (dir in this.selectorGrips) {
				this.selectorGrips[dir].setAttribute("display", bShow);
			}
			if(elem) this.updateGripCursors(canvas.getRotationAngle(elem));
		};
		
		// Updates cursors for corner grips on rotation so arrows point the right way
		this.updateGripCursors = function(angle) {
			var dir_arr = [];
			var steps = Math.round(angle / 45);
			if(steps < 0) steps += 8;
			for (dir in this.selectorGrips) {
				dir_arr.push(dir);
			}
			while(steps > 0) {
				dir_arr.push(dir_arr.shift());
				steps--;
			}
			var i = 0;
			for (dir in this.selectorGrips) {
				this.selectorGrips[dir].setAttribute('style', ("cursor:" + dir_arr[i] + "-resize"));
				i++;
			};
		};
		
		this.resize = function() {
			var selectedBox = this.selectorRect;
			var selectedGrips = this.selectorGrips;
			var selected = this.selectedElement;
			var sw = round(selected.getAttribute("stroke-width"));
			var offset = 1/canvas.getZoom();
			if (selected.getAttribute("stroke") != "none" && !isNaN(sw)) {
				offset += sw/2;
			}
			if (selected.tagName == "text") {
				offset += 2/canvas.getZoom();
			}
			var bbox = canvas.getBBox(this.selectedElement);
			if(selected.tagName == 'g') {
				// The bbox for a group does not include stroke vals, so we
				// get the bbox based on its children. 
				var stroked_bbox = canvas.getStrokedBBox(selected.childNodes);
				$.each(bbox, function(key, val) {
					bbox[key] = stroked_bbox[key];
				});
			}

			// loop and transform our bounding box until we reach our first rotation
			var tlist = canvas.getTransformList(this.selectedElement);
			var m = transformListToTransform(tlist).matrix;

			// This should probably be handled somewhere else, but for now
			// it keeps the selection box correctly positioned when zoomed
			m.e *= current_zoom;
			m.f *= current_zoom;
			
			// apply the transforms
			var l=bbox.x-offset, t=bbox.y-offset, w=bbox.width+(offset<<1), h=bbox.height+(offset<<1);
			var nbox = transformBox(l*current_zoom, t*current_zoom, w*current_zoom, h*current_zoom, m);

			// TODO: handle negative?

			var sr_handle = svgroot.suspendRedraw(100);

			var dstr = "M" + nbox.tl.x + "," + nbox.tl.y 
						+ " L" + nbox.tr.x + "," + nbox.tr.y 
						+ " " + nbox.br.x + "," + nbox.br.y
						+ " " + nbox.bl.x + "," + nbox.bl.y + "z";
			assignAttributes(selectedBox, {'d': dstr});
			
			var gripCoords = {
				nw: [nbox.tl.x, nbox.tl.y],
				ne: [nbox.tr.x, nbox.tr.y],
				sw: [nbox.bl.x, nbox.bl.y],
				se: [nbox.br.x, nbox.br.y],
				n:  [nbox.tl.x + (nbox.tr.x-nbox.tl.x)/2, nbox.tl.y + (nbox.tr.y-nbox.tl.y)/2],
				w:	[nbox.tl.x + (nbox.bl.x-nbox.tl.x)/2, nbox.tl.y + (nbox.bl.y-nbox.tl.y)/2],
				e:	[nbox.tr.x + (nbox.br.x-nbox.tr.x)/2, nbox.tr.y + (nbox.br.y-nbox.tr.y)/2],
				s:	[nbox.bl.x + (nbox.br.x-nbox.bl.x)/2, nbox.bl.y + (nbox.br.y-nbox.bl.y)/2]
			};
			$.each(gripCoords, function(dir, coords) {
				assignAttributes(selectedGrips[dir], {
					cx: coords[0], cy: coords[1]
				});
			});

			// we want to go 20 pixels in the negative transformed y direction, ignoring scale
			var dy = (nbox.tl.y - nbox.tr.y),
				dx = (nbox.tr.x - nbox.tl.x),
				theta = Math.atan2(dy,dx);
			dy = 20 * Math.cos(theta);
			dx = 20 * Math.sin(theta)
			var rotatept = {x:(l+w/2)*current_zoom,y:t*current_zoom};
			rotatept = transformPoint( rotatept.x, rotatept.y, m);
			assignAttributes(this.rotateGripConnector, { x1: nbox.tl.x + (nbox.tr.x-nbox.tl.x)/2, 
														y1: nbox.tl.y + (nbox.tr.y-nbox.tl.y)/2, 
														x2: rotatept.x-dx, y2: rotatept.y-dy });
			assignAttributes(this.rotateGrip, { cx: rotatept.x-dx, cy: rotatept.y-dy });
			
			svgroot.unsuspendRedraw(sr_handle);
		};

		// now initialize the selector
		this.reset(elem);
	};

	function SelectorManager() {

		// this will hold the <g> element that contains all selector rects/grips
		this.selectorParentGroup = null;

		// this is a special rect that is used for multi-select
		this.rubberBandBox = null;

		// this will hold objects of type Selector (see above)
		this.selectors = [];

		// this holds a map of SVG elements to their Selector object
		this.selectorMap = {};

		// local reference to this object
		var mgr = this;

		this.initGroup = function() {
			// remove old selector parent group if it existed
			if (mgr.selectorParentGroup && mgr.selectorParentGroup.parentNode) {
				mgr.selectorParentGroup.parentNode.removeChild(mgr.selectorParentGroup);
			}
			// create parent selector group and add it to svgroot
			mgr.selectorParentGroup = svgdoc.createElementNS(svgns, "g");
			mgr.selectorParentGroup.setAttribute("id", "selectorParentGroup");
			svgroot.appendChild(mgr.selectorParentGroup);
			mgr.selectorMap = {};
			mgr.selectors = [];
			mgr.rubberBandBox = null;
			mgr.update();
		};

		this.requestSelector = function(elem) {
			if (elem == null) return null;
			var N = this.selectors.length;
			// if we've already acquired one for this element, return it
			if (typeof(this.selectorMap[elem.id]) == "object") {
				this.selectorMap[elem.id].locked = true;
				return this.selectorMap[elem.id];
			}

			for (var i = 0; i < N; ++i) {
				if (this.selectors[i] && !this.selectors[i].locked) {
					this.selectors[i].locked = true;
					this.selectors[i].reset(elem);
					this.selectorMap[elem.id] = this.selectors[i];
					return this.selectors[i];
				}
			}
			// if we reached here, no available selectors were found, we create one
			this.selectors[N] = new Selector(N, elem);
			this.selectorParentGroup.appendChild(this.selectors[N].selectorGroup);
			this.selectorMap[elem.id] = this.selectors[N];
			return this.selectors[N];
		};
		this.releaseSelector = function(elem) {
			if (elem == null) return;
			var N = this.selectors.length;
			var sel = this.selectorMap[elem.id];
			for (var i = 0; i < N; ++i) {
				if (this.selectors[i] && this.selectors[i] == sel) {
					if (sel.locked == false) {
						console.log("WARNING! selector was released but was already unlocked");
					}
					delete this.selectorMap[elem.id];
					sel.locked = false;
					sel.selectedElement = null;
					sel.showGrips(false);

					// remove from DOM and store reference in JS but only if it exists in the DOM
					try {
						sel.selectorGroup.setAttribute("display", "none");
					} catch(e) { }

					break;
				}
			}
		};

		// this keeps the selector groups as the last child in the document
		this.update = function() {
			this.selectorParentGroup = svgroot.appendChild(this.selectorParentGroup);
		};

		this.getRubberBandBox = function() {
			if (this.rubberBandBox == null) {
				this.rubberBandBox = this.selectorParentGroup.appendChild(
						addSvgElementFromJson({ "element": "rect",
							"attr": {
								"id": "selectorRubberBand",
								"fill": "blue",
								"fill-opacity": 0.15,
								"stroke": "blue",
								"stroke-width": 0.5,
								"display": "none",
								"style": "pointer-events:none"
							}
						}));
			}
			return this.rubberBandBox;
		};

		this.initGroup();
	}
	// **************************************************************************************

	// **************************************************************************************
	// SVGTransformList implementation for Webkit 
	// These methods do not currently raise any exceptions.
	// These methods also do not check that transforms are being inserted or handle if
	// a transform is already in the list, etc.  This is basically implementing as much
	// of SVGTransformList that we need to get the job done.
	//
	//  interface SVGEditTransformList { 
	//		attribute unsigned long numberOfItems;
	//		void   clear (  )
	//		SVGTransform initialize ( in SVGTransform newItem )
	//		SVGTransform getItem ( in unsigned long index )
	//		SVGTransform insertItemBefore ( in SVGTransform newItem, in unsigned long index )
	//		SVGTransform replaceItem ( in SVGTransform newItem, in unsigned long index )
	//		SVGTransform removeItem ( in unsigned long index )
	//		SVGTransform appendItem ( in SVGTransform newItem )
	//		NOT IMPLEMENTED: SVGTransform createSVGTransformFromMatrix ( in SVGMatrix matrix );
	//		NOT IMPLEMENTED: SVGTransform consolidate (  );
	//	}
	// **************************************************************************************
	var svgTransformLists = {};
	var SVGEditTransformList = function(elem) {
		this._elem = elem || null;
		this._xforms = [];
		// TODO: how do we capture the undo-ability in the changed transform list?
		this._update = function() {
			var tstr = "";
			var concatMatrix = svgroot.createSVGMatrix();
			for (var i = 0; i < this.numberOfItems; ++i) {
				var xform = this._list.getItem(i);
				tstr += transformToObj(xform).text + " ";
			}
			this._elem.setAttribute("transform", tstr);
		};
		this._list = this;
		
		this.numberOfItems = 0;
		this.clear = function() { 
			this.numberOfItems = 0;
			this._xforms = [];
		};
		
		this.initialize = function(newItem) {
			this.numberOfItems = 1;
			this._xforms = [newItem];
		};
		
		this.getItem = function(index) {
			if (index < this.numberOfItems && index >= 0) {
				return this._xforms[index];
			}
			return null;
		};
		
		this.insertItemBefore = function(newItem, index) {
			var retValue = null;
			if (index >= 0) {
				if (index < this.numberOfItems) {
					var newxforms = new Array(this.numberOfItems + 1);
					// TODO: use array copying and slicing
					for ( var i = 0; i < index; ++i) {
						newxforms[i] = this._xforms[i];
					}
					newxforms[i] = newItem;
					for ( var j = i+1; i < this.numberOfItems; ++j, ++i) {
						newxforms[j] = this._xforms[i];
					}
					this.numberOfItems++;
					this._xforms = newxforms;
					retValue = newItem;
					this._list._update();
				}
				else {
					retValue = this._list.appendItem(newItem);
				}
			}
			return retValue;
		};
		
		this.replaceItem = function(newItem, index) {
			var retValue = null;
			if (index < this.numberOfItems && index >= 0) {
				this._xforms[index] = newItem;
				retValue = newItem;
				this._list._update();
			}
			return retValue;
		};
		
		this.removeItem = function(index) {
			var retValue = null;
			if (index < this.numberOfItems && index >= 0) {
				var retValue = this._xforms[index];
				var newxforms = new Array(this.numberOfItems - 1);
				for (var i = 0; i < index; ++i) {
					newxforms[i] = this._xforms[i];
				}
				for (var j = i; j < this.numberOfItems-1; ++j, ++i) {
					newxforms[j] = this._xforms[i+1];
				}
				this.numberOfItems--;
				this._xforms = newxforms;
				this._list._update();
			}
			return retValue;
		};
		
		this.appendItem = function(newItem) {
			this._xforms.push(newItem);
			this.numberOfItems++;
			this._list._update();
			return newItem;
		};
	};
	// **************************************************************************************

	var addSvgElementFromJson = function(data) {
		return canvas.updateElementFromJson(data)
	};

	var assignAttributes = function(node, attrs, suspendLength) {
		if(!suspendLength) suspendLength = 0;
		// Opera has a problem with suspendRedraw() apparently
		var handle = null;
		if (!window.opera) svgroot.suspendRedraw(suspendLength);

		for (i in attrs) {
			var ns = (i.substr(0,4) == "xml:" ? xmlns : 
				i.substr(0,6) == "xlink:" ? xlinkns : null);
			node.setAttributeNS(ns, i, attrs[i]);
		}
		
		if (!window.opera) svgroot.unsuspendRedraw(handle);
	};

	// remove unneeded attributes
	// makes resulting SVG smaller
	var cleanupElement = function(element) {
		var handle = svgroot.suspendRedraw(60);
		if (element.getAttribute('fill-opacity') == '1')
			element.removeAttribute('fill-opacity');
		if (element.getAttribute('opacity') == '1')
			element.removeAttribute('opacity');
		if (element.getAttribute('stroke') == 'none')
			element.removeAttribute('stroke');
		if (element.getAttribute('stroke-dasharray') == 'none')
			element.removeAttribute('stroke-dasharray');
		if (element.getAttribute('stroke-opacity') == '1')
			element.removeAttribute('stroke-opacity');
		if (element.getAttribute('stroke-width') == '1')
			element.removeAttribute('stroke-width');
		if (element.getAttribute('rx') == '0')
			element.removeAttribute('rx')
		if (element.getAttribute('ry') == '0')
			element.removeAttribute('ry')
		if (element.getAttribute('display') == 'inline')
			element.removeAttribute('display');
		svgroot.unsuspendRedraw(handle);
	};

	this.updateElementFromJson = function(data) {
		var shape = svgdoc.getElementById(data.attr.id);
		// if shape is a path but we need to create a rect/ellipse, then remove the path
		if (shape && data.element != shape.tagName) {
			current_layer.removeChild(shape);
			shape = null;
		}
		if (!shape) {
			shape = svgdoc.createElementNS(svgns, data.element);
			if (current_layer) {
				current_layer.appendChild(shape);
			}
		}
		assignAttributes(shape, data.attr, 100);
		cleanupElement(shape);
		return shape;
	};

	// TODO: declare the variables and set them as null, then move this setup stuff to
	// an initialization function - probably just use clear()
	var canvas = this;
	var container = c;
	var svgns = "http://www.w3.org/2000/svg";
	var xlinkns = "http://www.w3.org/1999/xlink";
	var xmlns = "http://www.w3.org/XML/1998/namespace";
	var idprefix = "svg_";
	var svgdoc  = c.ownerDocument;
	var svgroot = svgdoc.createElementNS(svgns, "svg");
	svgroot.setAttribute("width", 640);
	svgroot.setAttribute("height", 480);
	svgroot.setAttribute("id", "svgroot");
	svgroot.setAttribute("xmlns", svgns);
	svgroot.setAttribute("xmlns:xlink", xlinkns);
	container.appendChild(svgroot);
	var svgcontent = svgdoc.createElementNS(svgns, "svg");
	svgcontent.setAttribute('id', 'svgcontent');
	svgcontent.setAttribute('viewBox', '0 0 640 480');
	svgcontent.setAttribute("xmlns", svgns);
	svgcontent.setAttribute("xmlns:xlink", xlinkns);
	svgroot.appendChild(svgcontent);
	// TODO: make this string optional and set by the client
	// TODO: make sure this is always at the top of the SVG file right underneath the <svg> element
	var comment = svgdoc.createComment(" Created with SVG-edit - http://svg-edit.googlecode.com/ ");
	svgcontent.appendChild(comment);
	// TODO For Issue 208: this is a start on a thumbnail
//	var svgthumb = svgdoc.createElementNS(svgns, "use");
//	svgthumb.setAttribute('width', '100');
//	svgthumb.setAttribute('height', '100');
//	svgthumb.setAttributeNS(xlinkns, 'href', '#svgcontent');
//	svgroot.appendChild(svgthumb);
	// z-ordered array of tuples containing layer names and <g> elements
	// the first layer is the one at the bottom of the rendering
	var all_layers = [];
	var encodableImages = {};
	var last_good_img_url = 'images/logo.png';
	// pointer to the current layer <g>
	var current_layer = null;
	var save_options = {round_digits: 5};
	var d_attr = null;
	var started = false;
	var obj_num = 1;
	var start_x = null;
	var start_y = null;
	var start_transform = null;
	var current_mode = "select";
	var current_resize_mode = "none";
	
	var all_properties = {
		shape: {
			fill: "#FF0000",
			fill_paint: null,
			fill_opacity: 1,
			stroke: "#000000",
			stroke_paint: null,
			stroke_opacity: 1,
			stroke_width: 5,
			stroke_style: 'none',
			opacity: 1
		}
	};
	
	all_properties.text = $.extend(true, {}, all_properties.shape);
	$.extend(all_properties.text, {
		fill: "#000000",
		stroke_width: 0,
		font_size: 24,
		font_family: 'serif'
	});

	var cur_shape = all_properties.shape;
	var cur_text = all_properties.text;
	var cur_properties = cur_shape;
	
	var freehand_min_x = null;
	var freehand_max_x = null;
	var freehand_min_y = null;
	var freehand_max_y = null;
	var current_path = null;
	var current_path_pts = [];
	var current_path_pt = -1;
	var current_path_pt_drag = -1;
	var current_path_oldd = null;
	var current_ctrl_pt_drag = -1;
	var link_control_pts = false;
	var current_zoom = 1;
	// this will hold all the currently selected elements
	// default size of 1 until it needs to grow bigger
	var selectedElements = new Array(1); 
	// this holds the selected's bbox
	var selectedBBoxes = new Array(1);
	var justSelected = null;
	// this object manages selectors for us
	var selectorManager = new SelectorManager();
	var rubberBox = null;
	var events = {};
	var undoStackPointer = 0;
	var undoStack = [];
	var curBBoxes = [];

	// This method rounds the incoming value to the nearest value based on the current_zoom
	var round = function(val){
		return parseInt(val*current_zoom)/current_zoom;
	};

	// This method sends back an array or a NodeList full of elements that
	// intersect the multi-select rubber-band-box on the current_layer only.
	// 
	// Since the only browser that supports the SVG DOM getIntersectionList is Opera, 
	// we need to provide an implementation here.  We brute-force it for now.
	// 
	// Reference:
	// Firefox does not implement getIntersectionList(), see https://bugzilla.mozilla.org/show_bug.cgi?id=501421
	// Webkit does not implement getIntersectionList(), see https://bugs.webkit.org/show_bug.cgi?id=11274
	var getIntersectionList = function(rect) {
		if (rubberBox == null) { return null; }

		if(!curBBoxes.length) {
			// Cache all bboxes
			curBBoxes = canvas.getVisibleElements(current_layer, true);
		}
		
		var resultList = null;
		try {
			resultList = current_layer.getIntersectionList(rect, null);
		} catch(e) { }

		if (resultList == null || typeof(resultList.item) != "function") {
			resultList = [];

			var rubberBBox = rubberBox.getBBox();
			$.each(rubberBBox, function(key, val) {
				rubberBBox[key] = val / current_zoom;
			});
			var i = curBBoxes.length;
			while (i--) {
				if (Utils.rectsIntersect(rubberBBox, curBBoxes[i].bbox))  {
					resultList.push(curBBoxes[i].elem);
				}
			}
		}
		// addToSelection expects an array, but it's ok to pass a NodeList 
		// because using square-bracket notation is allowed: 
		// http://www.w3.org/TR/DOM-Level-2-Core/ecma-script-binding.html
		return resultList;
	};

	// FIXME: we MUST compress consecutive text changes to the same element
	// (right now each keystroke is saved as a separate command that includes the
	// entire text contents of the text element)
	// TODO: consider limiting the history that we store here (need to do some slicing)
	var addCommandToHistory = function(cmd) {
		// if our stack pointer is not at the end, then we have to remove
		// all commands after the pointer and insert the new command
		if (undoStackPointer < undoStack.length && undoStack.length > 0) {
			undoStack = undoStack.splice(0, undoStackPointer);
		}
		undoStack.push(cmd);
		undoStackPointer = undoStack.length;
	};

// private functions
	var getId = function() {
		if (events["getid"]) return call("getid", obj_num);
		return idprefix + obj_num;
	};

	var getNextId = function() {
		// ensure the ID does not exist
		var id = getId();
		while (svgdoc.getElementById(id)) {
			obj_num++;
			id = getId();
		}
		return id;
	};

	var call = function(event, arg) {
		if (events[event]) {
			return events[event](this,arg);
		}
	};

	// this function sanitizes the input node and its children
	// this function only keeps what is allowed from our whitelist defined above
	var sanitizeSvg = function(node) {
		// we only care about element nodes
		// automatically return for all comment, etc nodes
		// for text, we do a whitespace trim
		if (node.nodeType == 3) {
			node.nodeValue = node.nodeValue.replace(/^\s+|\s+$/g, "");
			// Remove empty text nodes
			if(!node.nodeValue.length) node.parentNode.removeChild(node);
		}
		if (node.nodeType != 1) return;
		var doc = node.ownerDocument;
		var parent = node.parentNode;
		// can parent ever be null here?  I think the root node's parent is the document...
		if (!doc || !parent) return;

		var allowedAttrs = svgWhiteList[node.nodeName];
		// if this element is allowed
		if (allowedAttrs != undefined) {
			var i = node.attributes.length;
			while (i--) {
				// if the attribute is not in our whitelist, then remove it
				// could use jQuery's inArray(), but I don't know if that's any better
				var attrName = node.attributes.item(i).nodeName;
				if (allowedAttrs.indexOf(attrName) == -1) {
					// TODO: do I need to call setAttribute(..., "") here for Fx2?
					node.removeAttribute(attrName);
				}
				if(attrName == 'd') {
					// Convert to absolute
					node.setAttribute('d',convertPath(node));
				}
			}

			// recurse to children
			i = node.childNodes.length;
			while (i--) { sanitizeSvg(node.childNodes.item(i)); }
		}
		// else, remove this element
		else {
			// remove all children from this node and insert them before this node
			var children = [];
			while (node.hasChildNodes()) {
				children.push(parent.insertBefore(node.firstChild, node));
			}

			// remove this node from the document altogether
			parent.removeChild(node);

			// call sanitizeSvg on each of those children
			var i = children.length;
			while (i--) { sanitizeSvg(children[i]); }

		}
	};

	var removeUnusedGrads = function() {
		var defs = svgcontent.getElementsByTagNameNS(svgns, "defs");
		if(!defs || !defs.length) return;
		
		var all_els = svgcontent.getElementsByTagNameNS(svgns, '*');
		var grad_uses = [];
		
		$.each(all_els, function(i, el) {
			var fill = el.getAttribute('fill');
			if(fill && fill.indexOf('url(#') == 0) {
				//found gradient
				grad_uses.push(fill);
			} 
			
			var stroke = el.getAttribute('stroke');
			if(stroke && stroke.indexOf('url(#') == 0) {
				//found gradient
				grad_uses.push(stroke);
			} 
		});
		
		var lgrads = svgcontent.getElementsByTagNameNS(svgns, "linearGradient");
		var grad_ids = [];
		var i = lgrads.length;
		while (i--) {
			var grad = lgrads[i];
			var id = grad.id;
			var url_id = 'url(#' + id + ')';
			if($.inArray(url_id, grad_uses) == -1) {
				// Not found, so remove
				grad.parentNode.removeChild(grad);
			}
		}
		
		// Remove defs if empty
		var i = defs.length;
		while (i--) {
			var def = defs[i];
			if(!def.getElementsByTagNameNS(svgns,'*').length) {
				def.parentNode.removeChild(def);
			}
		}
	}
	
	var svgCanvasToString = function() {
		removeUnusedGrads();
		canvas.clearPath(true);
		$.each(svgcontent.childNodes, function(i, node) {
			if(i && node.nodeType == 8 && node.data.indexOf('Created with') != -1) {
				svgcontent.insertBefore(node, svgcontent.firstChild);
			}
		});
		svgcontent.removeAttribute('id');
		var res = canvas.getResolution();
 		assignAttributes(svgcontent, {width: res.w, height: res.h});
		svgcontent.removeAttribute('viewBox');
		var output = svgToString(svgcontent, 0);
		assignAttributes(svgcontent, {id: 'svgcontent', 'viewBox':[0,0,res.w,res.h].join(' ')});
		return output;
	}

	var svgToString = function(elem, indent) {
		var out = new Array();
		if (elem) {
			cleanupElement(elem);
			var attrs = elem.attributes;
			var attr;
			var i;
			var childs = elem.childNodes;
			for (i=0; i<indent; i++) out.push(" ");
			out.push("<"); out.push(elem.nodeName);
			for (i=attrs.length-1; i>=0; i--) {
				attr = attrs.item(i);
				var attrVal = attr.nodeValue;
				
				if (attrVal != "") {
					if(attrVal.indexOf('pointer-events') == 0) continue;
					out.push(" "); 
					if(attr.localName == 'd') attrVal = convertPath(elem, true);
					if(!isNaN(attrVal)) {
						attrVal = shortFloat(attrVal);
					}
					
					// Embed images when saving 
					if(save_options.apply
						&& elem.nodeName == 'image' 
						&& attr.localName == 'href'
						&& save_options.images
						&& save_options.images == 'embed') {
						var img = encodableImages[attrVal];
						if(img) attrVal = img;
					}
					
					// map various namespaces to our fixed namespace prefixes
					// TODO: put this into a map and do a look-up instead of if-else
					if (attr.namespaceURI == xlinkns) {
						out.push('xlink:');
					}
					else if(attr.namespaceURI == 'http://www.w3.org/2000/xmlns/' && attr.localName != 'xmlns') {
						out.push('xmlns:');
					}
					else if(attr.namespaceURI == xmlns) {
						out.push('xml:');
					}
					out.push(attr.localName); out.push("=\""); 
					out.push(attrVal); out.push("\"");
				}
			}
			if (elem.hasChildNodes()) {
				out.push(">");
				indent++;
				var bOneLine = false;
				for (i=0; i<childs.length; i++)
				{
					var child = childs.item(i);
					if (child.id == "selectorParentGroup") continue;
					switch(child.nodeType) {
					case 1: // element node
						out.push("\n");
						out.push(svgToString(childs.item(i), indent));
						break;
					case 3: // text node
						var str = child.nodeValue.replace(/^\s+|\s+$/g, "");
						if (str != "") {
							bOneLine = true;
							out.push(toXml(str) + "");
						}
						break;
					case 8: // comment
						out.push("\n");
						out.push(new Array(indent+1).join(" "));
						out.push("<!--");
						out.push(child.data);
						out.push("-->");
						break;
					} // switch on node type
				}
				indent--;
				if (!bOneLine) {
					out.push("\n");
					for (i=0; i<indent; i++) out.push(" ");
				}
				out.push("</"); out.push(elem.nodeName); out.push(">");
			} else {
				out.push("/>");
			}
		}
		return out.join('');
	}; // end svgToString()

	this.embedImage = function(val, callback) {
	
		// Below is some code to fetch the data: URL representation
		// of local image files. It is commented out until we figure out
		// a way of introducing this as an option into the UI.  Also, it 
		// does not work in Firefox at all :(

		// load in the image and once it's loaded, get the dimensions
		$(new Image()).load(function() {
			// create a canvas the same size as the raster image
			var canvas = document.createElement("canvas");
			canvas.width = this.width;
			canvas.height = this.height;
			// load the raster image into the canvas
			canvas.getContext("2d").drawImage(this,0,0);
			// retrieve the data: URL
			try {
				var urldata = ';svgedit_url=' + encodeURIComponent(val);
				urldata = canvas.toDataURL().replace(';base64',urldata+';base64');
				encodableImages[val] = urldata;
			} catch(e) {
				encodableImages[val] = false;
			}
			last_good_img_url = val;
			if(callback) callback(encodableImages[val]);
		}).attr('src',val);
	}

	// importNode, like cloneNode, causes the comma-to-period
	// issue in Opera/Win/non-en. Thankfully we can compare to the original XML
	// and simply use the original value when necessary
	this.fixOperaXML = function(elem, orig_el) {
		var x_attrs = elem.attributes;
		$.each(x_attrs, function(i, attr) {
			if(attr.nodeValue.indexOf(',') == -1) return;
			// attr val has comma, so let's get the good value
			var ns = attr.prefix == 'xlink' ? xlinkns : 
				attr.prefix == "xml" ? xmlns : null;
			var good_attrval = orig_el.getAttribute(attr.localName);
			if(ns) {
				elem.setAttributeNS(ns, attr.nodeName, good_attrval);
			} else {
				elem.setAttribute(attr.nodeName, good_attrval);
			}
		});

		var childs = elem.childNodes;
		var o_childs = orig_el.childNodes;
		$.each(childs, function(i, child) {
			if(child.nodeType == 1) {
				canvas.fixOperaXML(child, o_childs[i]);
			}
		});
	}

	var recalculateAllSelectedDimensions = function() {
		var text = (current_resize_mode == "none" ? "position" : "size");
		var batchCmd = new BatchCommand(text);

		var i = selectedElements.length;
		while(i--) {
			var cmd = recalculateDimensions(selectedElements[i]);
			if (cmd) {
				batchCmd.addSubCommand(cmd);
			}
		}

		if (!batchCmd.isEmpty()) {
			addCommandToHistory(batchCmd);
			call("changed", selectedElements);
		}
	};
	
	/*
	
	The user changes shape geometry in one of several ways:
		- drag/moving it
		- rotating it
		- FUTURE: skewing it
		- resizing it
	(we ignore path node editing here)
	
	From a transformation point of view:
		- translations are always in the editor's frame of reference (NOT the element's)
		- rotations rotate the element's frame of reference
		- FUTURE: skewing skews the element's rotated frame of reference
		- resizing modifies the dimensions of the element in its rotated+skewed
		  frame of reference.
	
	Thus, from a coding point of view, what we do when the user is changing geometry is:
	
	- when the user drags an element, we PREPEND the tlist with a: 
			translate(tx,ty)
	- when the user rotates an element, we INSERT into the tlist a:
			rotate(angle,cx,cy) after any translates 
	- FUTURE: when the user skews an element, we INSERT into the tlist a:
			skewX(angle) or skewY(angle) after the rotate
	- when the user is resizing an element, we APPEND the tlist with a:
			translate(tx,ty) scale(sx,sy) translate(-tx,-ty)

	Thus, a simple element's transform list looks like the following:
		[ Translate ] [ Rotate ] [ SkewX/Y] [ Scale ]

	When the user is done changing the shape's geometry (i.e. upon lifting the mouse button)		
	we then attempt to reduce the transform list of the element by the following:
	
	- a translate can be removed by actually moving the element (modifying its x,y values)
	- a rotate cannot be removed
	- FUTURE: a skewX/skewY cannot be removed
	- a scale can be removed by resizing the element (modifying its width/height values)
		
	Thus, a simple element's transform list can always be reduced to:
		[ Rotate ] [ SkewX/Y ]
		
	However, a group is an element that contains one or more other elements, let's call 
	this a Complex Element.
		
	From the user point of view, a complex element is handled no differently 
	than a simple element.  Thus its transform list looks like the following:
		[ Translate] [ Rotate ] [ SkewX/SkewY ] [ Scale ]
		
	This means a complex element has a reduced transform list as:
		[ Rotate ] [ SkewX/SkewY ] [ Scale ]
		
	Next, we have to consider the case when a group is dissolved (ungrouped).  When
	the group is dissolving, the transform list must make its way down to the children.
	
	Thus, every child of the now-dissolved group inherits the transformlist.  Child N's 
	transform list looks like:
		[ Parent Rotate ] [ Parent SkewX/SkewY ] [ Parent Scale ] [ Rotate ] [ SkewX/SkewY ] [ Scale ]
	
	*/

	// this is how we map paths to our preferred relative segment types
	var pathMap = [ 0, 'z', 'M', 'M', 'L', 'L', 'C', 'C', 'Q', 'Q', 'A', 'A', 
					'L', 'L', 'L', 'L', // TODO: be less lazy below and map them to h and v
					'S', 'S', 'T', 'T' ];
	var truePathMap = [0, 'z', 'M', 'm', 'L', 'l', 'C', 'c', 'Q', 'q', 'A', 'a', 
						'H', 'h', 'V', 'v', 'S', 's', 'T', 't'];

	var logMatrix = function(m) {
		console.log([m.a,m.b,m.c,m.d,m.e,m.f]);
	};
	
	var remapElement = function(selected,changes,m) {
		var remap = function(x,y) { return transformPoint(x,y,m); };
		var scalew = function(w) { return m.a*w; }
		var scaleh = function(h) { return m.d*h; }
		var box = canvas.getBBox(selected);

		switch (selected.tagName)
		{
			case "line":
				var pt1 = remap(changes["x1"],changes["y1"]),
					pt2 = remap(changes["x2"],changes["y2"]);
				changes["x1"] = pt1.x;
				changes["y1"] = pt1.y;
				changes["x2"] = pt2.x;
				changes["y2"] = pt2.y;
				break;
			case "circle":
				var c = remap(changes["cx"],changes["cy"]);
				changes["cx"] = c.x;
				changes["cy"] = c.y;
				// take the minimum of the new selected box's dimensions for the new circle radius
				changes["r"] = Math.min(box.width/2,box.height/2);
				break;
			case "ellipse":
				var c = remap(changes["cx"],changes["cy"]);
				changes["cx"] = c.x;
				changes["cy"] = c.y;
				changes["rx"] = scalew(changes["rx"]);
				changes["ry"] = scaleh(changes["ry"]);
				break;
			case "rect":
			case "image":
				var pt1 = remap(changes["x"],changes["y"]);
				changes["x"] = pt1.x;
				changes["y"] = pt1.y;
				changes["width"] = scalew(changes["width"]);
				changes["height"] = scaleh(changes["height"]);
				break;
			case "text":
				var pt1 = remap(changes["x"],changes["y"]);
				changes["x"] = pt1.x;
				changes["y"] = pt1.y;
				break;
			case "polygon":
			case "polyline":
				var len = changes["points"].length;
				for (var i = 0; i < len; ++i) {
					var pt = changes["points"][i];
					pt = remap(pt.x,pt.y);
					changes["points"][i].x = pt.x;
					changes["points"][i].y = pt.y;
				}
				break;
			case "path":
				var len = changes["d"].length;
				var firstseg = changes["d"][0];
				var firstpt = remap(firstseg.x,firstseg.y);
				changes["d"][0].x = firstpt.x;
				changes["d"][0].y = firstpt.y;
				for (var i = 1; i < len; ++i) {
					var seg = changes["d"][i];
					var type = seg.type;
					// if absolute or first segment, we want to remap x, y, x1, y1, x2, y2
					// if relative, we want to scalew, scaleh
					if (type % 2 == 0) { // absolute
						var pt = remap(seg.x,seg.y),
							pt1 = remap(seg.x1,seg.y1),
							pt2 = remap(seg.x2,seg.y2);
						seg.x = pt.x;
						seg.y = pt.y;
						seg.x1 = pt1.x;
						seg.y1 = pt1.y;
						seg.x2 = pt2.x;
						seg.y2 = pt2.y;
						seg.r1 = scalew(seg.r1),
						seg.r2 = scaleh(seg.r2);
					}
					else { // relative
						seg.x = scalew(seg.x);
						seg.y = scaleh(seg.y);
						seg.x1 = scalew(seg.x1);
						seg.y1 = scaleh(seg.y1);
						seg.x2 = scalew(seg.x2);
						seg.y2 = scaleh(seg.y2);
						seg.r1 = scalew(seg.r1),
						seg.r2 = scaleh(seg.r2);
					}
				} // for each segment
				break;
		} // switch on element type to get initial values
		
		// now we have a set of changes and an applied reduced transform list
		// we apply the changes directly to the DOM
		// TODO: merge this switch with the above one and optimize
		switch (selected.tagName)
		{
			case "rect":
			case "image":
				changes.x = changes.x-0 + Math.min(0,changes.width);
				changes.y = changes.y-0 + Math.min(0,changes.height);
				changes.width = Math.abs(changes.width);
				changes.height = Math.abs(changes.height);
				assignAttributes(selected, changes, 1000);
				break;
			case "ellipse":
				changes.rx = Math.abs(changes.rx);
				changes.ry = Math.abs(changes.ry);
			case "circle":
				if(changes.r) changes.r = Math.abs(changes.r);
			case "line":
			case "text":
				assignAttributes(selected, changes, 1000);
				break;
			case "polyline":
			case "polygon":
				var len = changes["points"].length;
				var pstr = "";
				for (var i = 0; i < len; ++i) {
					var pt = changes["points"][i];
					pstr += pt.x + "," + pt.y + " ";
				}
				selected.setAttribute("points", pstr);
				break;
			case "path":
				var dstr = "";
				var len = changes["d"].length;
				for (var i = 0; i < len; ++i) {
					var seg = changes["d"][i];
					var type = seg.type;
					dstr += truePathMap[type];
					switch(type) {
						case 13: // relative horizontal line (h)
						case 12: // absolute horizontal line (H)
							dstr += seg.x + " ";
							break;
						case 15: // relative vertical line (v)
						case 14: // absolute vertical line (V)
							dstr += seg.y + " ";
							break;
						case 3: // relative move (m)
						case 5: // relative line (l)
						case 19: // relative smooth quad (t)
						case 2: // absolute move (M)
						case 4: // absolute line (L)
						case 18: // absolute smooth quad (T)
							dstr += seg.x + "," + seg.y + " ";
							break;
						case 7: // relative cubic (c)
						case 6: // absolute cubic (C)
							dstr += seg.x1 + "," + seg.y1 + " " + seg.x2 + "," + seg.y2 + " " +
								 seg.x + "," + seg.y + " ";
							break;
						case 9: // relative quad (q) 
						case 8: // absolute quad (Q)
							dstr += seg.x + "," + seg.y + " " + seg.x1 + "," + seg.y1 + " ";
							break;
						case 11: // relative elliptical arc (a)
						case 10: // absolute elliptical arc (A)
							dstr += seg.r1 + "," + seg.r2 + " " + seg.angle + " " + seg.largeArcFlag +
								" " + seg.sweepFlag + " " + seg.x + "," + seg.y + " ";
							break;
						case 17: // relative smooth cubic (s)
						case 16: // absolute smooth cubic (S)
							dstr += seg.x + "," + seg.y + " " + seg.x2 + "," + seg.y2 + " ";
							break;
					}
				}
				selected.setAttribute("d", dstr);
				break;
		}
		
	};
	
	// this function returns the command which resulted from the selected change
	// TODO: use suspendRedraw() and unsuspendRedraw() around this function
	var recalculateDimensions = function(selected) {
		if (selected == null) return null;
		
		var tlist = canvas.getTransformList(selected);

		// remove any stray identity transforms
		if (tlist && tlist.numberOfItems > 0) {
			var k = tlist.numberOfItems;
			while (k--) {
				var xform = tlist.getItem(k);
				if (xform.type == 0) {
					tlist.removeItem(k);
				}
				else if (xform.type == 1) {
					var m = xform.matrix;
					if (m.a == 1 && m.b == 0 && m.c == 0 && m.d == 1 && m.e == 0 && m.f == 0) {
						tlist.removeItem(k);
					}
				}
			}
		}
		
		// if this element had no transforms, we are done
		if (tlist.numberOfItems == 0) return null;
		
		// we know we have some transforms, so set up return variable		
		var batchCmd = new BatchCommand("Transform");
		
		// store initial values that will be affected by reducing the transform list
		var changes = {}, initial = null;
		switch (selected.tagName)
		{
			case "line":
				changes["x1"] = selected.getAttribute("x1");
				changes["y1"] = selected.getAttribute("y1");
				changes["x2"] = selected.getAttribute("x2");
				changes["y2"] = selected.getAttribute("y2");
				break;
			case "circle":
				changes["cx"] = selected.getAttribute("cx");
				changes["cy"] = selected.getAttribute("cy");
				changes["r"] = selected.getAttribute("r");
				break;
			case "ellipse":
				changes["cx"] = selected.getAttribute("cx");
				changes["cy"] = selected.getAttribute("cy");
				changes["rx"] = selected.getAttribute("rx");
				changes["ry"] = selected.getAttribute("ry");
				break;
			case "rect":
			case "image":
				changes["x"] = selected.getAttribute("x");
				changes["y"] = selected.getAttribute("y");
				changes["width"] = selected.getAttribute("width");
				changes["height"] = selected.getAttribute("height");
				break;
			case "text":
				changes["x"] = selected.getAttribute("x");
				changes["y"] = selected.getAttribute("y");
				break;
			case "polygon":
			case "polyline":
				initial = {};
				initial["points"] = selected.getAttribute("points");
				var list = selected.points;
				var len = list.numberOfItems;
				changes["points"] = new Array(len);
				for (var i = 0; i < len; ++i) {
					var pt = list.getItem(i);
					changes["points"][i] = {x:pt.x,y:pt.y};
				}
				break;
			case "path":
				initial = {};
				initial["d"] = selected.getAttribute("d");
				var segList = selected.pathSegList;
				var len = segList.numberOfItems;
				changes["d"] = new Array(len);
				for (var i = 0; i < len; ++i) {
					var seg = segList.getItem(i);
					changes["d"][i] = {
						type: seg.pathSegType,
						x: seg.x,
						y: seg.y,
						x1: seg.x1,
						y1: seg.y1,
						x2: seg.x2,
						y2: seg.y2,
						r1: seg.r1,
						r2: seg.r2,
						angle: seg.angle,
						largeArcFlag: seg.largeArcFlag,
						sweepFlag: seg.sweepFlag
					};
				}
				break;
		} // switch on element type to get initial values
		
		// if we haven't created an initial array in polygon/polyline/path, then 
		// make a copy of initial values and include the transform
		if (initial == null) {
			initial = $.extend(true, {}, changes);
		}
		// save the start transform value too
		initial["transform"] = start_transform ? start_transform : "";
		
		// if it's a group, we have special processing to flatten transforms
		if (selected.tagName == "g") {
			var tx = 0, ty = 0;
			var N = tlist.numberOfItems;
			
			// first, if it was a scale then the second-last transform will be it
			if (N >= 3 && tlist.getItem(N-2).type == 3 && 
				tlist.getItem(N-3).type == 2 && tlist.getItem(N-1).type == 2) 
			{
				// if the children are unrotated, pass the scale down directly
				// otherwise pass the equivalent matrix() down directly
				var tm = tlist.getItem(N-3).matrix;
				var sm = tlist.getItem(N-2).matrix;
				var tmn = tlist.getItem(N-1).matrix;
			
				var children = selected.childNodes;
				var c = children.length;
				while (c--) {
					var child = children.item(c);
					tx = 0;
					ty = 0;
					if (child.nodeType == 1) {
						var childTlist = canvas.getTransformList(child);
						var m = transformListToTransform(childTlist).matrix;
					
						var angle = canvas.getRotationAngle(child);
						if(angle || hasMatrixTransform(childTlist)) {
							var em = matrixMultiply(tm, sm, tmn, m);

							// this does not appear to work, something wrong with my logic here
							var e2t = svgroot.createSVGTransform();
							e2t.setMatrix(em);
							childTlist.clear();
							childTlist.appendItem(e2t,0);
						}
						// if not rotated or skewed, push the [T][S][-T] down to the child
						else {
							// update the transform list with translate,scale,translate
							
							// slide the [T][S][-T] from the front to the back
							// [T][S][-T][M] = [M][T2][S2][-T2]
							
							// [T][S][-T][M] = [T][S][M][-T2]
							// [-T2] = [M_inv][-T][M]
							var t2n = matrixMultiply(m.inverse(), tmn, m);
							// [T2] is always negative translation of [-T2]
							var t2 = svgroot.createSVGMatrix();
							t2.e = -t2n.e;
							t2.f = -t2n.f;
							
							// [T][S][-T][M] = [M][T2][S2][-T2]
							// [S2] = [T2_inv][M_inv][T][S][-T][M][-T2_inv]
							var s2 = matrixMultiply(t2.inverse(), m.inverse(), tm, sm, tmn, m, t2n.inverse());

							var translateOrigin = svgroot.createSVGTransform(),
								scale = svgroot.createSVGTransform(),
								translateBack = svgroot.createSVGTransform();
							translateOrigin.setTranslate(t2n.e, t2n.f);
							scale.setScale(s2.a, s2.d);
							translateBack.setTranslate(t2.e, t2.f);
							childTlist.appendItem(translateBack);
							childTlist.appendItem(scale);
							childTlist.appendItem(translateOrigin);
							batchCmd.addSubCommand( recalculateDimensions(child) );
						} // not rotated
					} // element
				} // for each child
				// Remove these transforms from group
				tlist.removeItem(N-1);
				tlist.removeItem(N-2);
				tlist.removeItem(N-3);
			}
			// next, check if the first transform was a translate 
			// if we had [ T1 ] [ M ] we want to transform this into [ M ] [ T2 ]
			// therefore [ T2 ] = [ M_inv ] [ T1 ] [ M ]
			else if ( (N == 1 || (N > 1 && tlist.getItem(1).type != 3)) && 
				tlist.getItem(0).type == 2) 
			{
				var T_M = transformListToTransform(tlist).matrix;
				tlist.removeItem(0);
				var M_inv = transformListToTransform(tlist).matrix.inverse();
				var M2 = matrixMultiply( M_inv, T_M );
				
				tx = M2.e;
				ty = M2.f;

				if (tx != 0 || ty != 0) {
					// now push this transform down to the children
					// FIXME: unfortunately recalculateDimensions depends on this global variable
					var old_start_transform = start_transform;
					start_transform = null;
					// we pass the translates down to the individual children
					var children = selected.childNodes;
					var c = children.length;
					while (c--) {
						var child = children.item(c);
						if (child.nodeType == 1) {
							var childTlist = canvas.getTransformList(child);
							var newxlate = svgroot.createSVGTransform();
							newxlate.setTranslate(tx,ty);
							childTlist.insertItemBefore(newxlate, 0);
							batchCmd.addSubCommand( recalculateDimensions(child) );
						}
					}
					start_transform = old_start_transform;
				}
			}
		}
		// else, it's a non-group
		else {
			var box = canvas.getBBox(selected);
			var center = {x: (box.x+box.width/2), y: (box.y+box.height/2)};
			var newcenter = {x: center.x, y: center.y };
			var m = svgroot.createSVGMatrix();

			// temporarily strip off the rotate
			var angle = canvas.getRotationAngle(selected);
			if (angle) {
				for (var i = 0; i < tlist.numberOfItems; ++i) {
					var xform = tlist.getItem(i);
					if (xform.type == 4) {
						tlist.removeItem(i);
						break;
					}
				}
			}

			var N = tlist.numberOfItems;
			var operation = 0;
			
			// first, if it was a scale then the second-last transform will be it
			// if we had [M][T][S][T] we want to extract the matrix equivalent of
			// [T][S][T] and push it down
			if (N >= 3 && tlist.getItem(N-2).type == 3 && 
				tlist.getItem(N-3).type == 2 && tlist.getItem(N-1).type == 2) 
			{
				operation = 3; // scale
				m = transformListToTransform(tlist,N-3,N-1).matrix;
				tlist.removeItem(N-1);
				tlist.removeItem(N-2);
				tlist.removeItem(N-3);
			}
			// if we had [T1][M] we want to transform this into [M][T2]
			// therefore [ T2 ] = [ M_inv ] [ T1 ] [ M ]
			else if ( (N == 1 || (N > 1 && tlist.getItem(1).type != 3)) && 
				tlist.getItem(0).type == 2) 
			{
				operation = 2; // translate
				var oldxlate = tlist.getItem(0).matrix,
					meq = transformListToTransform(tlist).matrix,
					meq_inv = meq.inverse();
				m = matrixMultiply( meq_inv, oldxlate, meq );
				tlist.removeItem(0);
			}
			else {
				operation = 4; // rotate
			}
			
			// if the shape was rotated, calculate what the center will be
			var xcenter = null;
			if (angle) {
				// calculate the new center from the translate
				if (operation == 2) {
					newcenter = transformPoint(center.x,center.y,m);
				}
				else if (operation == 3) {
					xcenter = transformPoint(center.x,center.y,m);
				}
			}

			if (operation == 2 || operation == 3) {
				remapElement(selected,changes,m);
			} // if we are remapping
			
			// if we had a rotation, re-add the rotation back with its original center
			if (angle) {
				var newRot = svgroot.createSVGTransform();
				newRot.setRotate(angle,newcenter.x,newcenter.y);
				tlist.insertItemBefore(newRot,0);
			}
			
			// at this point, the element looks exactly how we want it to look but its 
			// rotational center may be off in the case of a resize - we need to fix that
			if (angle && operation == 3) {
				box = canvas.getBBox(selected);
				m = transformListToTransform(tlist).matrix;

				// get its actual center
				newcenter = transformPoint(box.x+box.width/2, box.y+box.height/2, m);

				// determine the resultant delta translate to re-center
				var dx = newcenter.x - xcenter.x,
					dy = newcenter.y - xcenter.y;
				
				var delta = svgroot.createSVGMatrix().translate(dx,dy);
				remapElement(selected,changes,delta);

				var newRot = svgroot.createSVGTransform();
				newRot.setRotate(angle,newcenter.x,newcenter.y);
				tlist.replaceItem(newRot,0);
			}
		} // a non-group

		// if the transform list has been emptied, remove it
		if (tlist.numberOfItems == 0) {
			selected.removeAttribute("transform");
		}
		
		batchCmd.addSubCommand(new ChangeElementCommand(selected, initial));
		
		return batchCmd;
	};

// public events

	// Group: Selection

	// Function: clearSelection
	// Clears the selection.  The 'selected' handler is then called.
	this.clearSelection = function() {
		if (selectedElements[0] != null) {
			var len = selectedElements.length;
			for (var i = 0; i < len; ++i) {
				var elem = selectedElements[i];
				if (elem == null) break;
				selectorManager.releaseSelector(elem);
				selectedElements[i] = null;
				selectedBBoxes[i] = null;
			}
		}
		call("selected", selectedElements);
	};

	// TODO: do we need to worry about selectedBBoxes here?
	
	// Function: addToSelection
	// Adds a list of elements to the selection.  The 'selected' handler is then called.
	//
	// Parameters:
	// elemsToAdd - an array of DOM elements to add to the selection
	// showGrips - a boolean flag indicating whether the resize grips should be shown
	this.addToSelection = function(elemsToAdd, showGrips) {
		if (elemsToAdd.length == 0) { return; }
		// find the first null in our selectedElements array
		var j = 0;
		while (j < selectedElements.length) {
			if (selectedElements[j] == null) { 
				break;
			}
			++j;
		}
		
		// now add each element consecutively
		var i = elemsToAdd.length;
		while (i--) {
			var elem = elemsToAdd[i];
			// we ignore any selectors
			if (elem.id.substr(0,13) == "selectorGrip_") continue;
			// if it's not already there, add it
			if (selectedElements.indexOf(elem) == -1) {
				selectedElements[j] = elem;
				selectedBBoxes[j++] = this.getBBox(elem);
				var sel = selectorManager.requestSelector(elem);
				if (selectedElements.length > 1) {
					sel.showGrips(false);
				}
				call("selected", selectedElements);
			}
		}
		
		if(showGrips) {
			selectorManager.requestSelector(selectedElements[0]).showGrips(true);
		}
		else if (selectedElements.length > 1) {
			selectorManager.requestSelector(selectedElements[0]).showGrips(false);
		}

		// make sure the elements are in the correct order
		// See: http://www.w3.org/TR/DOM-Level-3-Core/core.html#Node3-compareDocumentPosition
	
		selectedElements.sort(function(a,b) {
			if(a && b && a.compareDocumentPosition) {
				return 3 - (b.compareDocumentPosition(a) & 6);	
			} else if(a == null) {
				return 1;
			}
		});
		
		// Make sure null value is at the end
		if(!selectedElements[0]) selectedElements.push(selectedElements.shift());
		
	};

	// TODO: could use slice here to make this faster?
	// TODO: should the 'selected' handler
	
	// Function: removeFromSelection
	// Removes elements from the selection.
	//
	// Parameters:
	// elemsToRemove - an array of elements to remove from selection
	this.removeFromSelection = function(elemsToRemove) {
		if (selectedElements[0] == null) { return; }
		if (elemsToRemove.length == 0) { return; }

		// find every element and remove it from our array copy
		var newSelectedItems = new Array(selectedElements.length);
		var newSelectedBBoxes = new Array(selectedBBoxes.length);
		var j = 0;
		var len = selectedElements.length;
		for (var i = 0; i < len; ++i) {
			var elem = selectedElements[i];
			if (elem) {
				// keep the item
				if (elemsToRemove.indexOf(elem) == -1) {
					newSelectedBBoxes[j] = selectedBBoxes[i];
					newSelectedItems[j++] = elem;
				}
				else { // remove the item and its selector
					selectorManager.releaseSelector(elem);
				}
			}
		}
		// the copy becomes the master now
		selectedElements = newSelectedItems;
		selectedBBoxes = newSelectedBBoxes;
	};
	
	this.addNodeToSelection = function(point) {
		// Currently only one node can be selected at a time, should allow more later
		// Should point be the index or the grip element?
		
		var is_closed = pathIsClosed(); 
		
		if(is_closed && point == current_path_pts.length/2 - 1) {
			current_path_pt = 0;
		} else {
			current_path_pt = point;
		}
		
		$('#pathpointgrip_container circle').attr('stroke','#00F');
		var grip = $('#pathpointgrip_' + point).attr('stroke','#0FF');
		$('#ctrlpointgrip_container circle').attr('fill', '#EEE');
		$('#ctrlpointgrip_' + current_path_pt + 'c1, #ctrlpointgrip_' + current_path_pt + 'c2').attr('fill','#0FF');
		
		updateSegLine();
		updateSegLine(true);
		
		call("selected", [grip[0]]);
	}

	// Some global variables that we may need to refactor
	var root_sctm = null;
	var mouse_target = null;

	// A (hopefully) quicker function to transform a point by a matrix
	// (this function avoids any DOM calls and just does the math)
	// Returns a x,y object representing the transformed point
	var transformPoint = function(x, y, m) {
		return { x: m.a * x + m.c * y + m.e, y: m.b * x + m.d * y + m.f};
	};
	
	// matrixMultiply() is provided because WebKit didn't implement multiply() correctly
	// on the SVGMatrix interface.  See https://bugs.webkit.org/show_bug.cgi?id=16062
	// This function tries to return a SVGMatrix that is the multiplication m1*m2.
	// As far as I can tell, there is no way for us to handle matrix multiplication 
	// of arbitrary matrices because we cannot directly set the a,b,c,d,e,f values
	// of the resulting matrix, we have to do it with translate/rotate/scale
	// TODO: Actually all browsers seem to allow setting of a-f in a SVGMatrix without 
	//       throwing an exception - perhaps an update was issued in SVG 1.1 2e?
	var matrixMultiply = function() {
		var multi2 = function(m1, m2) {
			var m = svgroot.createSVGMatrix();
			m.a = m1.a*m2.a + m1.c*m2.b;
			m.b = m1.b*m2.a + m1.d*m2.b,
			m.c = m1.a*m2.c + m1.c*m2.d,
			m.d = m1.b*m2.c + m1.d*m2.d,
			m.e = m1.a*m2.e + m1.c*m2.f + m1.e,
			m.f = m1.b*m2.e + m1.d*m2.f + m1.f;
			return m;
		}
		
		var args = arguments, i = args.length, m = args[i-1];
		
		while(i-- > 1) {
			var m1 = args[i-1];
			m = multi2(m1, m);
		}
		return m;
	}
	
	// This returns a single matrix Transform for a given Transform List
	// (this is the equivalent of SVGTransformList.consolidate() but unlike
	//  that method, this one does not modify the actual SVGTransformList)
	// This function is very liberal with its min,max arguments
	var transformListToTransform = function(tlist, min, max) {
		var min = min || 0;
		var max = max || (tlist.numberOfItems-1);
		min = parseInt(min);
		max = parseInt(max);
		if (min > max) { var temp = max; max = min; min = temp; }
		
		var m = svgroot.createSVGMatrix();
		for (var i = min; i <= max; ++i) {
			// if our indices are out of range, just use a harmless identity matrix
			var mtom = (i >= 0 && i < tlist.numberOfItems ? 
							tlist.getItem(i).matrix :
							svgroot.createSVGMatrix());
			m = matrixMultiply(m, mtom);
		}
		return svgroot.createSVGTransformFromMatrix(m);
	};
	
	var hasMatrixTransform = function(tlist) {
		var num = tlist.numberOfItems;
		while (num--) {
			if (tlist.getItem(num).type == 1) return true;
		}
		return false;
	}

//  // Easy way to loop through transform list, but may not be worthwhile	
// 	var eachXform = function(elem, callback) {
// 		var tlist = canvas.getTransformList(elem);
// 		var num = tlist.numberOfItems;
// 		if(num == 0) return;
// 		while(num--) {
// 			var xform = tlist.getItem(num);
// 			callback(xform, tlist);
// 		}
// 	}
	
    // FIXME: this should not have anything to do with zoom here - update the one place it is used this way
    // converts a tiny object equivalent of a SVGTransform
	// has the following properties:
	// - tx, ty, sx, sy, angle, cx, cy, string
	var transformToObj = function(xform, mZoom) {
		var m = xform.matrix;
		var tobj = {tx:0,ty:0,sx:1,sy:1,angle:0,cx:0,cy:0,text:""};
		var z = mZoom?current_zoom:1;
		switch(xform.type) {
			case 1: // MATRIX
				tobj.text = "matrix(" + [m.a,m.b,m.c,m.d,m.e,m.f].join(",") + ")";
				break;
			case 2: // TRANSLATE
				tobj.tx = m.e;
				tobj.ty = m.f;
				tobj.text = "translate(" + m.e*z + "," + m.f*z + ")";
				break;
			case 3: // SCALE
				tobj.sx = m.a;
				tobj.sy = m.d;
				if (m.a == m.d) tobj.text = "scale(" + m.a + ")";
				else tobj.text = "scale(" + m.a + "," + m.d + ")";
				break;
			case 4: // ROTATE
				tobj.angle = xform.angle;
				// this prevents divide by zero
				if (xform.angle != 0) {
					var K = 1 - m.a;
					tobj.cy = ( K * m.f + m.b*m.e ) / ( K*K + m.b*m.b );
					tobj.cx = ( m.e - m.b * tobj.cy ) / K;
				}
				tobj.text = "rotate(" + xform.angle + " " + tobj.cx*z + "," + tobj.cy*z + ")";
				break;
			// TODO: matrix, skewX, skewY
		}
		return tobj;
	};
	
	var transformBox = function(l, t, w, h, m) {
		var topleft = {x:l,y:t},
			topright = {x:(l+w),y:t},
			botright = {x:(l+w),y:(t+h)},
			botleft = {x:l,y:(t+h)};
		topleft = transformPoint( topleft.x, topleft.y, m );
		topright = transformPoint( topright.x, topright.y, m );
		botleft = transformPoint( botleft.x, botleft.y, m);
		botright = transformPoint( botright.x, botright.y, m );
		return {tl:topleft, tr:topright, bl:botleft, br:botright};
	};

	// - when we are in a create mode, the element is added to the canvas
	//   but the action is not recorded until mousing up
	// - when we are in select mode, select the element, remember the position
	//   and do nothing else
	var mouseDown = function(evt)
	{
		root_sctm = svgroot.getScreenCTM().inverse();
		var pt = transformPoint( evt.pageX, evt.pageY, root_sctm );
		var mouse_x = pt.x;
		var mouse_y = pt.y;
		evt.preventDefault();
    
		if($.inArray(current_mode, ['select', 'resize']) == -1) {
			addGradient();
		}
		
		x = mouse_x / current_zoom;
		y = mouse_y / current_zoom;
		
		start_x = x;
		start_y = y;

		// find mouse target
		mouse_target = evt.target;
		// go up until we hit a child of a layer
		while (mouse_target.parentNode.parentNode.tagName == "g") {
			mouse_target = mouse_target.parentNode;
		}
		// Webkit bubbles the mouse event all the way up to the div, so we
		// set the mouse_target to the svgroot like the other browsers
		if (mouse_target.nodeName.toLowerCase() == "div") {
			mouse_target = svgroot;
		}
		// if it is a selector grip, then it must be a single element selected, 
		// set the mouse_target to that and update the mode to rotate/resize
		if (mouse_target.parentNode == selectorManager.selectorParentGroup && selectedElements[0] != null) {
			var gripid = evt.target.id;
			var griptype = gripid.substr(0,20);
			// rotating
			if (griptype == "selectorGrip_rotate_") {
				current_mode = "rotate";
			}
			// resizing
			else if(griptype == "selectorGrip_resize_") {
				current_mode = "resize";
				current_resize_mode = gripid.substr(20,gripid.indexOf("_",20)-20);
			}
			mouse_target = selectedElements[0];
		}
		
		start_transform = mouse_target.getAttribute("transform");
		var tlist = canvas.getTransformList(mouse_target);

		switch (current_mode) {
			case "select":
				started = true;
				current_resize_mode = "none";
				if (mouse_target != svgroot) {
					// if this element is not yet selected, clear selection and select it
					if (selectedElements.indexOf(mouse_target) == -1) {
						// only clear selection if shift is not pressed (otherwise, add 
						// element to selection)
						if (!evt.shiftKey) {
							canvas.clearSelection();
						}
						canvas.addToSelection([mouse_target]);
						justSelected = mouse_target;
						current_path = null;
					}
					// else if it's a path, go into pathedit mode in mouseup

					// insert a dummy transform so if the element(s) are moved it will have
					// a transform to use for its translate
					for (var i = 0; i < selectedElements.length; ++i) {
						if(selectedElements[i] == null) continue;
						var slist = canvas.getTransformList(selectedElements[i]);
						slist.insertItemBefore(svgroot.createSVGTransform(), 0);
					}
				}
				else {
					canvas.clearSelection();
					current_mode = "multiselect";
					if (rubberBox == null) {
						rubberBox = selectorManager.getRubberBandBox();
					}
					start_x *= current_zoom;
					start_y *= current_zoom;
					assignAttributes(rubberBox, {
						'x': start_x,
						'y': start_y,
						'width': 0,
						'height': 0,
						'display': 'inline'
					}, 100);
				}
				break;
			case "zoom": 
				started = true;
				start_x = x;
				start_y = y;
				if (rubberBox == null) {
					rubberBox = selectorManager.getRubberBandBox();
				}
				assignAttributes(rubberBox, {
						'x': start_x * current_zoom,
						'y': start_y * current_zoom,
						'width': 0,
						'height': 0,
						'display': 'inline'
				}, 100);
				break;
			case "resize":
				started = true;
				start_x = x;
				start_y = y;
				// append three dummy transforms to the tlist so that
				// we can translate,scale,translate in mousemove
				tlist.appendItem(svgroot.createSVGTransform());
				tlist.appendItem(svgroot.createSVGTransform());
				tlist.appendItem(svgroot.createSVGTransform());
				break;
			case "fhellipse":
			case "fhrect":
			case "fhpath":
				started = true;
				start_x = x;
				start_y = y;
				d_attr = x + "," + y + " ";
				var stroke_w = cur_shape.stroke_width == 0?1:cur_shape.stroke_width;
				addSvgElementFromJson({
					"element": "polyline",
					"attr": {
						"points": d_attr,
						"id": getNextId(),
						"fill": "none",
						"stroke": cur_shape.stroke,
						"stroke-width": stroke_w,
						"stroke-dasharray": cur_shape.stroke_style,
						"stroke-opacity": cur_shape.stroke_opacity,
						"stroke-linecap": "round",
						"stroke-linejoin": "round",
						"opacity": cur_shape.opacity / 2,
						"style": "pointer-events:inherit"
					}
				});
				freehand_min_x = x;
				freehand_max_x = x;
				freehand_min_y = y;
				freehand_max_y = y;
				break;
			case "image":
				started = true;
				start_x = x;
				start_y = y;
				var newImage = addSvgElementFromJson({
					"element": "image",
					"attr": {
						"x": x,
						"y": y,
						"width": 0,
						"height": 0,
						"id": getNextId(),
						"opacity": cur_shape.opacity / 2,
						"style": "pointer-events:inherit"
					}
				});
        		newImage.setAttributeNS(xlinkns, "href", last_good_img_url);
				break;
			case "square":
				// FIXME: once we create the rect, we lose information that this was a square
				// (for resizing purposes this could be important)
			case "rect":
				started = true;
				start_x = x;
				start_y = y;
				addSvgElementFromJson({
					"element": "rect",
					"attr": {
						"x": x,
						"y": y,
						"width": 0,
						"height": 0,
						"id": getNextId(),
						"fill": cur_shape.fill,
						"stroke": cur_shape.stroke,
						"stroke-width": cur_shape.stroke_width,
						"stroke-dasharray": cur_shape.stroke_style,
						"stroke-opacity": cur_shape.stroke_opacity,
						"fill-opacity": cur_shape.fill_opacity,
						"opacity": cur_shape.opacity / 2,
						"style": "pointer-events:inherit"
					}
				});
				break;
			case "line":
				started = true;
				var stroke_w = cur_shape.stroke_width == 0?1:cur_shape.stroke_width;
				addSvgElementFromJson({
					"element": "line",
					"attr": {
						"x1": x,
						"y1": y,
						"x2": x,
						"y2": y,
						"id": getNextId(),
						"stroke": cur_shape.stroke,
						"stroke-width": stroke_w,
						"stroke-dasharray": cur_shape.stroke_style,
						"stroke-opacity": cur_shape.stroke_opacity,
						"fill": "none",
						"opacity": cur_shape.opacity / 2,
						"style": "pointer-events:inherit"
					}
				});
				break;
			case "circle":
				started = true;
				addSvgElementFromJson({
					"element": "circle",
					"attr": {
						"cx": x,
						"cy": y,
						"r": 0,
						"id": getNextId(),
						"fill": cur_shape.fill,
						"stroke": cur_shape.stroke,
						"stroke-width": cur_shape.stroke_width,
						"stroke-dasharray": cur_shape.stroke_style,
						"stroke-opacity": cur_shape.stroke_opacity,
						"fill-opacity": cur_shape.fill_opacity,
						"opacity": cur_shape.opacity / 2,
						"style": "pointer-events:inherit"
					}
				});
				break;
			case "ellipse":
				started = true;
				addSvgElementFromJson({
					"element": "ellipse",
					"attr": {
						"cx": x,
						"cy": y,
						"rx": 0,
						"ry": 0,
						"id": getNextId(),
						"fill": cur_shape.fill,
						"stroke": cur_shape.stroke,
						"stroke-width": cur_shape.stroke_width,
						"stroke-dasharray": cur_shape.stroke_style,
						"stroke-opacity": cur_shape.stroke_opacity,
						"fill-opacity": cur_shape.fill_opacity,
						"opacity": cur_shape.opacity / 2,
						"style": "pointer-events:inherit"
					}
				});
				break;
			case "text":
				started = true;
				var newText = addSvgElementFromJson({
					"element": "text",
					"attr": {
						"x": x,
						"y": y,
						"id": getNextId(),
						"fill": cur_text.fill,
						"stroke": cur_shape.stroke,
						"stroke-width": cur_text.stroke_width,
						"stroke-dasharray": cur_shape.stroke_style,
						"stroke-opacity": cur_shape.stroke_opacity,
						"fill-opacity": cur_shape.fill_opacity,
						// fix for bug where text elements were always 50% opacity
						"opacity": cur_shape.opacity,
						"font-size": cur_text.font_size,
						"font-family": cur_text.font_family,
						"text-anchor": "middle",
						"style": "pointer-events:inherit",
						"xml:space": "preserve"
					}
				});
				newText.textContent = "text";
				break;
			case "path":
				setPointContainerTransform("");
				started = true;
				break;
			case "pathedit":
				started = true;
				current_path_oldd = current_path.getAttribute("d");
				var id = evt.target.id;
				if (id.substr(0,14) == "pathpointgrip_") {
					// Select this point
					current_path_pt_drag = parseInt(id.substr(14));
					canvas.addNodeToSelection(current_path_pt_drag);
					updateSegLine();
				} else if(id.indexOf("ctrlpointgrip_") == 0) {
					current_ctrl_pt_drag = id.split('_')[1];
					var node_num = current_ctrl_pt_drag.split('c')[0]-0;
					canvas.addNodeToSelection(node_num);
				}

				if(current_path_pt_drag == -1 && current_ctrl_pt_drag == -1) {
					// if we haven't moused down on a shape, then go into multiselect mode
					// otherwise, select it
					canvas.clearSelection();
					if (mouse_target.id != "svgroot") {
						current_path = null;
						canvas.addToSelection([mouse_target], true);
						canvas.setMode("select");
						
						// Insert the dummy transform here in case element is moved
						var tlist = canvas.getTransformList(mouse_target);
						tlist.insertItemBefore(svgroot.createSVGTransform(), 0);
					}
					else {
						canvas.setMode("multiselect");
						if (rubberBox == null) {
							rubberBox = selectorManager.getRubberBandBox();
						}
						assignAttributes(rubberBox, {
							'x': start_x,
							'y': start_y,
							'width': 0,
							'height': 0,
							'display': 'inline'
						}, 100);
					}
				}

				break;
			case "rotate":
				started = true;
				// append a dummy transform that will be used as the rotate
				tlist.appendItem(svgroot.createSVGTransform());
				// we are starting an undoable change (a drag-rotation)
				canvas.beginUndoableChange("transform", selectedElements);
				break;
			default:
				console.log("Unknown mode in mousedown: " + current_mode);
				break;
		}
	};

	// in this function we do not record any state changes yet (but we do update
	// any elements that are still being created, moved or resized on the canvas)
	// TODO: svgcanvas should just retain a reference to the image being dragged instead
	// of the getId() and getElementById() funkiness - this will help us customize the ids 
	// a little bit for squares and paths
	var mouseMove = function(evt)
	{
		if (!started) return;
		var selected = selectedElements[0];
		var pt = transformPoint( evt.pageX, evt.pageY, root_sctm );
		var mouse_x = pt.x;
		var mouse_y = pt.y;
		var shape = svgdoc.getElementById(getId());
    
    	x = mouse_x / current_zoom;
    	y = mouse_y / current_zoom;
    
    	evt.preventDefault();
    	
    	var setRect = function(square) {
    		var w = Math.abs(x - start_x),
    			h = Math.abs(y - start_y),
    			new_x, new_y;
    		if(square) {
				w = h = Math.max(w, h);
				new_x = start_x < x ? start_x : start_x - w;
				new_y = start_y < y ? start_y : start_y - h;
			} else {
				new_x = Math.min(start_x,x);
				new_y = Math.min(start_y,y);
			}

			assignAttributes(shape,{
				'width': w,
				'height': h,
				'x': new_x,
				'y': new_y
			},1000);
    	}
    	
		switch (current_mode)
		{
			case "select":
				// we temporarily use a translate on the element(s) being dragged
				// this transform is removed upon mousing up and the element is 
				// relocated to the new location
				if (selectedElements[0] != null) {
					var dx = x - start_x;
					var dy = y - start_y;
					if (dx != 0 || dy != 0) {
						var len = selectedElements.length;
						for (var i = 0; i < len; ++i) {
							var selected = selectedElements[i];
							if (selected == null) break;
							var box = canvas.getBBox(selected);
							selectedBBoxes[i].x = box.x + dx;
							selectedBBoxes[i].y = box.y + dy;

							// update the dummy transform in our transform list
							// to be a translate
							var xform = svgroot.createSVGTransform();
							var tlist = canvas.getTransformList(selected);
							xform.setTranslate(dx,dy);
							if(tlist.numberOfItems) {
								tlist.replaceItem(xform, 0);
								// TODO: Webkit returns null here, find out why
// 								console.log(selected.getAttribute("transform"))

							} else {
								tlist.appendItem(xform);
							}
							
							// update our internal bbox that we're tracking while dragging
							selectorManager.requestSelector(selected).resize();
						}
					}
				}
				break;
			case "multiselect":
				x *= current_zoom;
				y *= current_zoom;
				assignAttributes(rubberBox, {
					'x': Math.min(start_x,x),
					'y': Math.min(start_y,y),
					'width': Math.abs(x-start_x),
					'height': Math.abs(y-start_y)
				},100);

				// clear out selection and set it to the new list
				canvas.clearSelection();
				// FIXME: fix this, need to supply rect to getIntersectionList()
				canvas.addToSelection(getIntersectionList());

				/*
				// for each selected:
				// - if newList contains selected, do nothing
				// - if newList doesn't contain selected, remove it from selected
				// - for any newList that was not in selectedElements, add it to selected
				var elemsToRemove = [];
				var newList = getIntersectionList();
				var len = selectedElements.length;
				for (var i = 0; i < len; ++i) {
					var ind = newList.indexOf(selectedElements[i]);
					if (ind == -1) {
						elemsToRemove.push(selectedElements[i]);
					}
					else {
						newList[ind] = null;
					}
				}
				if (elemsToRemove.length > 0) 
					canvas.removeFromSelection(elemsToRemove);
				*/
				break;
			case "resize":
				// we track the resize bounding box and translate/scale the selected element
				// while the mouse is down, when mouse goes up, we use this to recalculate
				// the shape's coordinates
				var box=canvas.getBBox(selected), left=box.x, top=box.y, width=box.width,
					height=box.height, dx=(x-start_x), dy=(y-start_y);
								
				// if rotated, adjust the dx,dy values
				var angle = canvas.getRotationAngle(selected);
				if (angle) {
 					var r = Math.sqrt( dx*dx + dy*dy );
					var theta = Math.atan2(dy,dx) - angle * Math.PI / 180.0;
					dx = r * Math.cos(theta);
					dy = r * Math.sin(theta);
				}

				// if not stretching in y direction, set dy to 0
				// if not stretching in x direction, set dx to 0
				if(current_resize_mode.indexOf("n")==-1 && current_resize_mode.indexOf("s")==-1) {
					dy = 0;
				}
				if(current_resize_mode.indexOf("e")==-1 && current_resize_mode.indexOf("w")==-1) {
					dx = 0;
				}				
				
				var ts = null;
				var tx = 0, ty = 0;
				var sy = height ? (height+dy)/height : 1, 
					sx = width ? (width+dx)/width : 1;
				// if we are dragging on the north side, then adjust the scale factor and ty
				if(current_resize_mode.indexOf("n") != -1) {
					sy = height ? (height-dy)/height : 1;
					ty = height;
				}
				
				// if we dragging on the east side, then adjust the scale factor and tx
				if(current_resize_mode.indexOf("w") != -1) {
					sx = width ? (width-dx)/width : 1;
					tx = width;
				}
				
				// update the transform list with translate,scale,translate
				var tlist = canvas.getTransformList(selected);
				var translateOrigin = svgroot.createSVGTransform(),
					scale = svgroot.createSVGTransform(),
					translateBack = svgroot.createSVGTransform();
				translateOrigin.setTranslate(-(left+tx),-(top+ty));
				if(evt.shiftKey) {
					if(sx == 1) sx = sy
					else sy = sx;
				}
				scale.setScale(sx,sy);

				
				translateBack.setTranslate(left+tx,top+ty);
				var N = tlist.numberOfItems;
				tlist.replaceItem(translateBack, N-3);
				tlist.replaceItem(scale, N-2);
				tlist.replaceItem(translateOrigin, N-1);
				
				var selectedBBox = selectedBBoxes[0];				

				// reset selected bbox top-left position
				selectedBBox.x = left;
				selectedBBox.y = top;
				
				// if this is a translate, adjust the box position
				if (tx) {
					selectedBBox.x += dx;
				}
				if (ty) {
					selectedBBox.y += dy;
				}

				selectorManager.requestSelector(selected).resize();
				break;
			case "zoom":
				x *= current_zoom;
				y *= current_zoom;
				assignAttributes(rubberBox, {
					'x': Math.min(start_x*current_zoom,x),
					'y': Math.min(start_y*current_zoom,y),
					'width': Math.abs(x-start_x*current_zoom),
					'height': Math.abs(y-start_y*current_zoom)
				},100);			
				break;
			case "text":
				assignAttributes(shape,{
					'x': x,
					'y': y
				},1000);
				break;
			case "line":
				// Opera has a problem with suspendRedraw() apparently
				var handle = null;
				if (!window.opera) svgroot.suspendRedraw(1000);
				shape.setAttributeNS(null, "x2", x);
				shape.setAttributeNS(null, "y2", y);
				if (!window.opera) svgroot.unsuspendRedraw(handle);
				break;
			case "square":
				setRect(true);
				break;
			case "rect":
			case "image":
				setRect(evt.shiftKey);
				break;
			case "circle":
				var cx = shape.getAttributeNS(null, "cx");
				var cy = shape.getAttributeNS(null, "cy");
				var rad = Math.sqrt( (x-cx)*(x-cx) + (y-cy)*(y-cy) );
				shape.setAttributeNS(null, "r", rad);
				break;
			case "ellipse":
				var cx = shape.getAttributeNS(null, "cx");
				var cy = shape.getAttributeNS(null, "cy");
				// Opera has a problem with suspendRedraw() apparently
				var handle = null;
				if (!window.opera) svgroot.suspendRedraw(1000);
				shape.setAttributeNS(null, "rx", Math.abs(x - cx) );
				var ry = Math.abs(evt.shiftKey?(x - cx):(y - cy));
				shape.setAttributeNS(null, "ry", ry );
				if (!window.opera) svgroot.unsuspendRedraw(handle);
				break;
			case "fhellipse":
			case "fhrect":
				freehand_min_x = Math.min(x, freehand_min_x);
				freehand_max_x = Math.max(x, freehand_max_x);
				freehand_min_y = Math.min(y, freehand_min_y);
				freehand_max_y = Math.max(y, freehand_max_y);
			// break; missing on purpose
			case "fhpath":
				start_x = x;
				start_y = y;
				d_attr += + x + "," + y + " ";
				shape.setAttributeNS(null, "points", d_attr);
				break;
			// update path stretch line coordinates
			case "path":
				var line = document.getElementById("path_stretch_line");
				if (line) {
					line.setAttribute("x2", x *= current_zoom);
					line.setAttribute("y2", y *= current_zoom);
				}
				break;
			case "pathedit":
				// if we are dragging a point, let's move it
				if (current_path_pt_drag != -1 && current_path) {
					var old_path_pts = $.map(current_path_pts, function(n){return n/current_zoom;});
					updatePath(mouse_x, mouse_y, old_path_pts);
				} else if (current_ctrl_pt_drag != -1 && current_path) {
					// Moving the control point. Since only one segment is altered,
					// we only need to do a pathSegList replace.
					
					var data = current_ctrl_pt_drag.split('c');
					var index = data[0]-0;
					var ctrl_num = data[1]-0;
					var pt_index;
					var pt_count = current_path_pts.length/2;
					updateCurvedSegment(mouse_x, mouse_y, index, ctrl_num);
					if(link_control_pts) {
						var is_closed = pathIsClosed();
						if(ctrl_num == 1) {
							ctrl_num = 2;
							index--;
							pt_index = index+1;

							if(index < 0) {
								index = pt_count - 2;
								if(!is_closed) break;
							}
						} else {
							ctrl_num = 1;
							index++;
							pt_index = index;
							
							if(index >= pt_count - 1) {
								index = 0;
								if(!is_closed) break;
							}
						}
						
						var pt = getPathPoint(pt_index, true);
						var new_x = pt[0] - (mouse_x - pt[0]);
						var new_y = pt[1] - (mouse_y - pt[1]);
						updateCurvedSegment(new_x, new_y, index, ctrl_num, true);
					}
				}
				break;
			case "rotate":
				var box = canvas.getBBox(selected),
					cx = round(box.x + box.width/2), 
					cy = round(box.y + box.height/2);
				var m = transformListToTransform(canvas.getTransformList(selected)).matrix;
				var center = transformPoint(cx,cy,m);
				cx = center.x;
				cy = center.y;
				var angle = round(((Math.atan2(cy-y,cx-x)  * (180/Math.PI))-90) % 360);
				canvas.setRotationAngle(angle<-180?(360+angle):angle, true);
				call("changed", selectedElements);
				break;
			default:
				break;
		}
	}; // mouseMove()

	var shortFloat = function(val) {
		var digits = save_options.round_digits;
		if(!isNaN(val)) {
			return Number(Number(val).toFixed(digits));
		} else if($.isArray(val)) {
			return shortFloat(val[0]) + ',' + shortFloat(val[1]);
		}
	}
	
	this.reorientPath = function() {
		var elem = selectedElements[0];
		if(!elem) return;
		var angle = canvas.getRotationAngle(elem);
		if(angle == 0) return;
		var batchCmd = new BatchCommand("Reorient path");
		var changes = {
			d: elem.getAttribute('d'),
			transform: elem.getAttribute('transform')
		};
		batchCmd.addSubCommand(new ChangeElementCommand(elem, changes));
		canvas.clearSelection();
		resetPathOrientation(elem);
		addCommandToHistory(batchCmd);
		current_path = elem;
		setPointContainerTransform("");	// Maybe this should be in resetPointGrips?
		resetPointGrips();
		canvas.clearPath();

		canvas.addToSelection([elem], true);
		call("changed", selectedElements);
	}
	
	// Rotate all points of a path and remove its transform value
	var resetPathOrientation = function(path) {
		if(path == null || path.nodeName != 'path') return false;

		var tlist = canvas.getTransformList(path);
		var m = transformListToTransform(tlist).matrix;
		path.removeAttribute("transform");
		
		var segList = path.pathSegList;
		var len = segList.numberOfItems;

		for (var i = 0; i < len; ++i) {
			var seg = segList.getItem(i);
			var type = seg.pathSegType;
			if(type == 1) continue;
			var pts = [];
			$.each(['',1,2], function(j, n) {
				var x = seg['x'+n], y = seg['y'+n];
				if(x && y) {
					var pt = transformPoint(x, y, m);
					pts.splice(pts.length, 0, pt.x, pt.y);
				}
			});
			replacePathSeg(type, i, pts, path);
		}
	}

	// Convert an element to a path
	this.convertToPath = function(elem, getBBox, angle) {
		if(elem == null) {
			var elems = selectedElements;
			$.each(selectedElements, function(i, elem) {
				if(elem) canvas.convertToPath(elem);
			});
			return;
		}
		
		if(!getBBox) {
			var batchCmd = new BatchCommand("Convert element to Path");
		}
		
		var attrs = getBBox?{}:{
			"fill": cur_shape.fill,
			"fill-opacity": cur_shape.fill_opacity,
			"stroke": cur_shape.stroke,
			"stroke-width": cur_shape.stroke_width,
			"stroke-dasharray": cur_shape.stroke_style,
			"stroke-opacity": cur_shape.stroke_opacity,
			"opacity": cur_shape.opacity,
			"visibility":"hidden"
		};
		
		var path = addSvgElementFromJson({
			"element": "path",
			"attr": attrs
		});
		
		var eltrans = elem.getAttribute("transform");
		if(eltrans) {
			path.setAttribute("transform",eltrans);
		}
		
		var id = elem.id;
		var parent = elem.parentNode;
		if(elem.nextSibling) {
			parent.insertBefore(path, elem);
		} else {
			parent.appendChild(path);
		}
		
		var d = '';
		
		var joinSegs = function(segs) {
			$.each(segs, function(j, seg) {
				var l = seg[0], pts = seg[1];
				d += l;
				for(var i=0; i < pts.length; i+=2) {
					d += (pts[i] +','+pts[i+1]) + ' ';
				}
			});
		}

		// Possibly the cubed root of 6, but 1.81 works best
		var num = 1.81;

		switch (elem.tagName) {
		case 'ellipse':
			var rx = elem.getAttribute('rx')-0;
			var ry = elem.getAttribute('ry')-0;
		case 'circle':
			if(elem.tagName == 'circle') {
				var rx = ry = elem.getAttribute('r')-0;
			}
			var cx = elem.getAttribute('cx')-0;
			var cy = elem.getAttribute('cy')-0;
		
			joinSegs([
				['M',[(cx-rx),(cy)]],
				['C',[(cx-rx),(cy-ry/num), (cx-rx/num),(cy-ry), (cx),(cy-ry)]],
				['C',[(cx+rx/num),(cy-ry), (cx+rx),(cy-ry/num), (cx+rx),(cy)]],
				['C',[(cx+rx),(cy+ry/num), (cx+rx/num),(cy+ry), (cx),(cy+ry)]],
				['C',[(cx-rx/num),(cy+ry), (cx-rx),(cy+ry/num), (cx-rx),(cy)]],
				['Z',[]]
			]);
			break;
		case 'path':
			d = elem.getAttribute('d');
			break;
		case 'line':
			var x1 = elem.getAttribute('x1');
			var x2 = elem.getAttribute('x2');
			var y1 = elem.getAttribute('y1');
			var y2 = elem.getAttribute('y2');
			d = "M"+x1+","+y1+"L"+x2+","+y2;
			break;
		case 'polyline':
		case 'polygon':
			var points = elem.getAttribute('points');
			d = "M"+points;
			break;
		case 'rect':
			var rx = elem.getAttribute('rx')-0;
			var ry = elem.getAttribute('ry')-0;
			var b = elem.getBBox();
			var x = b.x, y = b.y, w = b.width, h = b.height;
			var num = 4-num; // Why? Because!
			
			if(!rx && !ry) {
				// Regular rect
				joinSegs([
					['M',[x, y]],
					['L',[x+w, y]],
					['L',[x+w, y+h]],
					['L',[x, y+h]],
					['L',[x, y]],
					['Z',[]]
				]);
			} else {
				joinSegs([
					['M',[x, y+ry]],
					['C',[x,y+ry/num, x+rx/num,y, x+rx,y]],
					['L',[x+w-rx, y]],
					['C',[x+w-rx/num,y, x+w,y+ry/num, x+w,y+ry]],
					['L',[x+w, y+h-ry]],
					['C',[x+w, y+h-ry/num, x+w-rx/num,y+h, x+w-rx,y+h]],
					['L',[x+rx, y+h]],
					['C',[x+rx/num, y+h, x,y+h-ry/num, x,y+h-ry]],
					['L',[x, y+ry]],
					['Z',[]]
				]);
			}
			break;
		default:
			path.parentNode.removeChild(path);
			break;
		}
		
		if(d) {
			path.setAttribute('d',d);
		}
		
		if(!getBBox) {
			// Replace the current element with the converted one
			batchCmd.addSubCommand(new RemoveElementCommand(elem, parent));
			batchCmd.addSubCommand(new InsertElementCommand(path));

			canvas.clearSelection();
			elem.parentNode.removeChild(elem)
			path.setAttribute('id', id);
			path.removeAttribute("visibility");
			canvas.addToSelection([path], true);
			
			addCommandToHistory(batchCmd);
			
		} else {
			// Get the correct BBox of the new path, then discard it
			resetPathOrientation(path);
			var bb = false;
			try {
				bb = path.getBBox();
			} catch(e) {
				// Firefox fails
			}
			path.parentNode.removeChild(path);
			return bb;
		}
	}
	
	// Convert a path to one with only absolute or relative values
	var convertPath = function(path, toRel) {
		var segList = path.pathSegList;
		var len = segList.numberOfItems;
		var curx = 0, cury = 0;
		var d = "";
		
		for (var i = 0; i < len; ++i) {
			var seg = segList.getItem(i);
			// if these properties are not in the segment, set them to zero
			var x = seg.x || 0,
				y = seg.y || 0,
				x1 = seg.x1 || 0,
				y1 = seg.y1 || 0,
				x2 = seg.x2 || 0,
				y2 = seg.y2 || 0;

			var type = seg.pathSegType;
			var letter = pathMap[type]['to'+(toRel?'Lower':'Upper')+'Case']();
			var addToD = function(pnts, more, last) {
				var str = '';
				var more = more?' '+more.join(' '):'';
				var last = last?shortFloat(last):'';
				$.each(pnts, function(i, pnt) {
					pnts[i] = shortFloat(pnt);
				});
				d += letter + pnts.join(' ') + more + last;
			}
			
			switch (type) {
				case 1: // z,Z closepath (Z/z)
					d += "z";
					break;
				case 2: // absolute move (M)
				case 4: // absolute line (L)
				case 12: // absolute horizontal line (H)
				case 14: // absolute vertical line (V)
				case 18: // absolute smooth quad (T)
					x -= curx;
					y -= cury;
				case 3: // relative move (m)
				case 5: // relative line (l)
				case 13: // relative horizontal line (h)
				case 15: // relative vertical line (v)
				case 19: // relative smooth quad (t)
					if(toRel) {
						curx += x;
						cury += y;
					} else {
						x += curx;
						y += cury;
						curx = x;
						cury = y;
					}
					addToD([[x,y]]);
					break;
				case 6: // absolute cubic (C)
					x -= curx; x1 -= curx; x2 -= curx;
					y -= cury; y1 -= cury; y2 -= cury;
				case 7: // relative cubic (c)
					if(toRel) {
						curx += x;
						cury += y;
					} else {
						x += curx; x1 += curx; x2 += curx;
						y += cury; y1 += cury; y2 += cury;
						curx = x;
						cury = y;
					}
					addToD([[x1,y1],[x2,y2],[x,y]]);
					break;
				case 8: // absolute quad (Q)
					x -= curx; x1 -= curx;
					y -= cury; y1 -= cury;
				case 9: // relative quad (q) 
					if(toRel) {
						curx += x;
						cury += y;
					} else {
						x += curx; x1 += curx;
						y += cury; y1 += cury;
						curx = x;
						cury = y;
					}
					addToD([[x1,y1],[x,y]]);
					break;
				case 10: // absolute elliptical arc (A)
					x -= curx;
					y -= cury;
				case 11: // relative elliptical arc (a)
					if(toRel) {
						curx += x;
						cury += y;
					} else {
						x += curx;
						y += cury;
						curx = x;
						cury = y;
					}
					addToD([[seg.r1,seg.r2]], [
							seg.angle,
							(seg.largeArcFlag ? 1 : 0),
							(seg.sweepFlag ? 1 : 0)
						],[x,y]
					);
					break;
				case 16: // absolute smooth cubic (S)
					x -= curx; x2 -= curx;
					y -= cury; y2 -= cury;
				case 17: // relative smooth cubic (s)
					if(toRel) {
						curx += x;
						cury += y;
					} else {
						x += curx; x2 += curx;
						y += cury; y2 += cury;
						curx = x;
						cury = y;
					}
					addToD([[x2,y2],[x,y]]);
					break;
			} // switch on path segment type
		} // for each segment
		return d;
	};

	var resetPointGrips = function() {
		var sr = svgroot.suspendRedraw(100);
		removeAllPointGripsFromPath();
		recalcPathPoints();
		addAllPointGripsToPath();
		svgroot.unsuspendRedraw(sr);
	};
	
	var setPointContainerTransform = function(value) {
		var conts = $('#pathpointgrip_container,#ctrlpointgrip_container');
		$.each(conts,function() {
			this.setAttribute("transform", value);
			if(!value) {
				this.removeAttribute("transform");
			}
		});
	}
	
	var recalcPathPoints = function() {
		current_path_pts = [];
		var segList = current_path.pathSegList;
		var curx = segList.getItem(0).x, cury = segList.getItem(0).y;
		current_path_pts.push(curx * current_zoom);
		current_path_pts.push(cury * current_zoom);
		var len = segList.numberOfItems;
		for (var i = 1; i < len; ++i) {
			var l = segList.getItem(i);
			var x = l.x, y = l.y;
			// paths can now be closed, skip Z segments
			if (l.pathSegType == 1) {
				break;
			}
			var type = l.pathSegType;
			// current_path_pts just holds the absolute coords
			if (type == 4) {
				curx = x;
				cury = y;
			} // type 4 (abs line)
			else if (type == 5) {
				curx += x;
				cury += y;
			} // type 5 (rel line)
			else if (type == 6) {
				curx = x;
				cury = y;
			} // type 6 (abs curve)
			else if (type == 7) {
				curx += x;
				cury += y;
			} // type 7 (rel curve)
			current_path_pts.push(curx * current_zoom);
			current_path_pts.push(cury * current_zoom);
		} // for each segment	
	}

	var removeAllPointGripsFromPath = function() {
		// loop through and hide all pointgrips
		$('#pathpointgrip_container > *').attr("display", "none");

		var line = document.getElementById("path_stretch_line");
		if (line) line.setAttribute("display", "none");
		
		$('#ctrlpointgrip_container *').attr('display','none');
	};

	var addAllPointGripsToPath = function(pointToSelect) {
		// loop through and show all pointgrips
		var len = current_path_pts.length;
		for (var i = 0; i < len; i += 2) {
			var grip = document.getElementById("pathpointgrip_"+i/2);
			if (grip) {
				assignAttributes(grip, {
					'cx': current_path_pts[i],
					'cy': current_path_pts[i+1],
					'display': 'inline'
				});
			}
			else {
				addPointGripToPath(current_path_pts[i], current_path_pts[i+1],i/2);
			}
			
			var index = i/2;
			var item = current_path.pathSegList.getItem(index);
			if(item.pathSegType == 6) {
				index -= 1;
				// Same code as when making a curve, needs to be in own function
				var cur_x = getPathPoint(index)[0];
				var cur_y = getPathPoint(index)[1];
				var next_x = getPathPoint(index+1)[0];
				var next_y = getPathPoint(index+1)[1];
				addControlPointGrip(item.x1,item.y1, cur_x,cur_y, index+'c1');
				addControlPointGrip(item.x2,item.y2, next_x,next_y, index+'c2');
			} 
		}
		// FIXME:  we cannot just use the same transform as the path because we might be 
		// at a different zoom level
		var angle = canvas.getRotationAngle(current_path);
		if (angle) {
			var bbox = canvas.getBBox(current_path);
			var cx = (bbox.x + bbox.width/2) * current_zoom,
				cy = (bbox.y + bbox.height/2) * current_zoom;
			var xform = ["rotate(", angle, " ", cx, ",", cy, ")"].join("");
			setPointContainerTransform(xform);
		}
		if(pointToSelect != null) {
			canvas.addNodeToSelection(pointToSelect);
		}
	};

	var addPointGripToPath = function(x,y,index) {
		// create the container of all the point grips
		var pointGripContainer = document.getElementById("pathpointgrip_container");
		if (!pointGripContainer) {
			var parent = document.getElementById("selectorParentGroup");
			pointGripContainer = parent.appendChild(document.createElementNS(svgns, "g"));
			pointGripContainer.id = "pathpointgrip_container";
		}

		var pointGrip = document.getElementById("pathpointgrip_"+index);
		// create it
		if (!pointGrip) {
			pointGrip = document.createElementNS(svgns, "circle");
			assignAttributes(pointGrip, {
				'id': "pathpointgrip_" + index,
				'display': "none",
				'r': 4,
				'fill': "#0FF",
				'stroke': "#00F",
				'stroke-width': 2,
				'cursor': 'move',
				'style': 'pointer-events:all',
				'xlink:title': 'Drag point to move it. Double-click point to change segment type.'
			});
			pointGrip = pointGripContainer.appendChild(pointGrip);

			var grip = $('#pathpointgrip_'+index);
			grip.dblclick(function() {
				canvas.setSegType();
			});
		}
		
		// set up the point grip element and display it
		assignAttributes(pointGrip, {
			'cx': x,
			'cy': y,
			'display': "inline",
		});
	};
	
	var pathIsClosed = function() {
		if(!current_path) return;
		return current_path.getAttribute('d').substr(-1,1).toLowerCase() == 'z';
	}
	
	var updateSegLine = function(next_node) {
		// create segment line
		var segLine = document.getElementById("segline");
		if(!segLine) {
			var pointGripContainer = $('#pathpointgrip_container')[0];
			segLine = document.createElementNS(svgns, "path");
			assignAttributes(segLine, {
				'id': "segline",
				'fill': "none",
				'stroke': "#0FF",
				'stroke-width': 2,
				'style':'pointer-events:none'
			});
			segLine = pointGripContainer.appendChild(segLine);
		}
		if(!segLine.getAttribute('d')) {
			var pt = getPathPoint(current_path_pt);
			segLine.setAttribute('d', 'M' + pt.join(',') + ' 0,0');
		}
		segLine.setAttribute('display','inline');
		
		if(current_path_pt+1 >= current_path.pathSegList.numberOfItems) {
			segLine.setAttribute('display','none');
			return;
		}
		
		if(!next_node) {
			// Replace "M" val
			replacePathSeg(2, 0, getPathPoint(current_path_pt, true), segLine);
		} else {
			var seg = current_path.pathSegList.getItem(current_path_pt+1);
			var points = [seg.x, seg.y];
			if(seg.x1 != null && seg.x2 != null) {
				points.splice(2, 0, seg.x1, seg.y1, seg.x2, seg.y2);
			}
			points = $.map(points, function(n){return n*current_zoom;});
			replacePathSeg(seg.pathSegType, 1, points, segLine);
		}
	}
	
	var updatePath = function(mouse_x, mouse_y, old_path_pts) {
    	var x = mouse_x / current_zoom;
    	var y = mouse_y / current_zoom;
    	
    	var is_closed = pathIsClosed(); 
	
		var i = current_path_pt_drag * 2;
		var last_index = current_path_pts.length/2 - 1;
		var is_first = current_path_pt_drag == 0 || (is_closed && current_path_pt_drag == last_index);
		var is_last = !is_closed && current_path_pt_drag == last_index;
		
		// if the image is rotated, then we must modify the x,y mouse coordinates
		// and rotate them into the shape's rotated coordinate system
		// we also re-map mouse_x/y and x/y into the rotated coordinate system
		var angle = canvas.getRotationAngle(current_path, true);
		if (angle) {
			// calculate the shape's old center that was used for rotation
			var box = selectedBBoxes[0];
			var cx = round(box.x + box.width/2) * current_zoom, 
				cy = round(box.y + box.height/2) * current_zoom;
			var dx = mouse_x - cx, dy = mouse_y - cy;
			var r = Math.sqrt( dx*dx + dy*dy );
			var theta = Math.atan2(dy,dx) - angle;						
			current_path_pts[i] = mouse_x = cx + r * Math.cos(theta);
			current_path_pts[i+1] = mouse_y = cy + r * Math.sin(theta);
			x = mouse_x / current_zoom;
			y = mouse_y / current_zoom;
		}
		else {
			current_path_pts[i] = x * current_zoom;
			current_path_pts[i+1] = y * current_zoom;
		}
		
		if(is_first && is_closed) {
			// Update the first point
			current_path_pts[0] = current_path_pts[i];
			current_path_pts[1] = current_path_pts[i+1];
			current_path_pt_drag = 0;
		}

		var index = current_path_pt_drag;
		var abs_x = getPathPoint(index)[0];
		var abs_y = getPathPoint(index)[1];
		
		var item = current_path.pathSegList.getItem(index);
		var x_diff = x - old_path_pts[index*2];
		var y_diff = y - old_path_pts[index*2 + 1];
		
		var cur_type = item.pathSegType;
		var points = [];
		
		if(cur_type == 6) {
			points = [abs_x,abs_y, item.x1,item.y1, item.x2 + x_diff,item.y2 + y_diff];
		} else {
			if(is_first) {
				// Need absolute position for first point
				points = getPathPoint(0);
			} else {
				points = [abs_x, abs_y];
			}
		}
		replacePathSeg(cur_type, index, points);

		var setSeg = function(index,first) {
			var points, item = current_path.pathSegList.getItem(index);
			var type = item.pathSegType;
			if(first) {
				item.x += x_diff;
				item.y += y_diff;
			}

			switch (type) {
			case 1:
				points = [];
				break;
			case 4:
				points = [item.x, item.y];
				break;
			case 6:
				if(first) {
					item.x1 -= x_diff;
					item.y1 -= y_diff;
					item.x2 += x_diff;
					item.y2 += y_diff;
				}

				points = [item.x, item.y, item.x1 + x_diff,item.y1 + y_diff, item.x2,item.y2];
				break;
			default:
				break;
			}
			replacePathSeg(type, index, points);
			return type;
		}
		
		if(is_closed || !is_last) { 
			var next_type = setSeg(index+1);
		} else {
			var next_type = 0;
		}
		
		if(is_first && is_closed) {
			var last_type = setSeg(last_index,1);
		}
			
		// move the point grip
		var grip = document.getElementById("pathpointgrip_" + current_path_pt_drag);
		if (grip) {
			grip.setAttribute("cx", mouse_x);
			grip.setAttribute("cy", mouse_y);
			if(is_closed && is_first) {
				var grip = document.getElementById("pathpointgrip_" + last_index);
				grip.setAttribute("cx", mouse_x);
				grip.setAttribute("cy", mouse_y);
			}
			call("changed", [grip]);
		}
		
		if(is_first) cur_type = last_type;
		
		if(cur_type != 4) {
			var num = is_first?last_index:index;
			var id2 = (num-1)+'c2';
			var line = document.getElementById("ctrlLine_"+id2);
			if(line) {
				// Don't do if first point on open path
				if(!(!is_closed && current_path_pt_drag == 0)) {
					var x2 = line.getAttribute('x2') - 0 + x_diff*current_zoom;
					var y2 = line.getAttribute('y2') - 0 + y_diff*current_zoom;
					addControlPointGrip(x2,y2, mouse_x,mouse_y, id2, true);
				}
			}
		}
		
		if(next_type != 4) {
			var id1 = (current_path_pt_drag)+'c1';
			var line = document.getElementById("ctrlLine_"+id1);
			if(line) {
				var x2 = line.getAttribute('x2') - 0 + x_diff*current_zoom;
				var y2 = line.getAttribute('y2') - 0 + y_diff*current_zoom;
				addControlPointGrip(x2,y2, mouse_x,mouse_y, id1, true);
			}
		}
		updateSegLine();
		if(next_type != 4) {
			updateSegLine(true);
		}
	}
	
	var updateCurvedSegment = function(mouse_x, mouse_y, index, ctrl_num) {
		var list = current_path.pathSegList;
		if(index+1 >= list.numberOfItems) {
			index = -1;
		}
		var c_item = list.getItem(index+1);
		
		// Only do curves
		if(c_item.pathSegType != 6) return;
		
		ctrl_pt_drag = index + 'c' + ctrl_num;
		
		var x = mouse_x / current_zoom;
		var y = mouse_y / current_zoom;
		
		var angle = canvas.getRotationAngle(current_path, true);
		
		// TODO: Make sure this works for linked control points
		if (angle) {
			// calculate the shape's old center that was used for rotation
			var box = selectedBBoxes[0];
			var cx = round(box.x + box.width/2) * current_zoom, 
				cy = round(box.y + box.height/2) * current_zoom;
			var dx = mouse_x - cx, dy = mouse_y - cy;
			var r = Math.sqrt( dx*dx + dy*dy );
			var theta = Math.atan2(dy,dx) - angle;						
			mouse_x = cx + r * Math.cos(theta);
			mouse_y = cy + r * Math.sin(theta);
			x = mouse_x / current_zoom;
			y = mouse_y / current_zoom;
		}
		
		c_item['x' + ctrl_num] = x;
		c_item['y' + ctrl_num] = y;
		replacePathSeg(6, index+1, [c_item.x,c_item.y, c_item.x1,c_item.y1, c_item.x2,c_item.y2]);
		
		updateSegLine(true);
		
		var grip = document.getElementById("ctrlpointgrip_" + ctrl_pt_drag);
		if(grip) {
			grip.setAttribute("cx", mouse_x);
			grip.setAttribute("cy", mouse_y);
			
			var line = document.getElementById("ctrlLine_"+ctrl_pt_drag);
			line.setAttribute("x2", mouse_x);
			line.setAttribute("y2", mouse_y);
		}
	}
	
	var getPathPoint = function(index, raw_val) {
		var len = current_path_pts.length;
		var pt_num = len/2;
		if(index < 0) {
			index += pt_num;
		} else if(index >= pt_num) {
			index -= pt_num;
		}
		var z = raw_val?1:current_zoom;
		return [current_path_pts[index*2] / z, current_path_pts[index*2 + 1] / z];
	}
	
	// This replaces the segment at the given index. Type is given as number.
	var replacePathSeg = function(type, index, pts, path) {
		if(!path) path = current_path;
		var func = 'createSVGPathSeg' + pathFuncs[type];
		var seg = path[func].apply(path, pts);
		path.pathSegList.replaceItem(seg, index);
	}
	
	var addControlPointGrip = function(x, y, source_x, source_y, id, raw_val) {
		if(!raw_val) {
			x *= current_zoom; y *= current_zoom;
			source_x *= current_zoom; source_y *= current_zoom;
		}
	
		// create the container of all the control point grips
		var ctrlPointGripContainer = document.getElementById("ctrlpointgrip_container");
		if (!ctrlPointGripContainer) {
			var parent = document.getElementById("selectorParentGroup");
			ctrlPointGripContainer = parent.appendChild(document.createElementNS(svgns, "g"));
			ctrlPointGripContainer.id = "ctrlpointgrip_container";
		}
		ctrlPointGripContainer.setAttribute("display", "inline");
		
		var ctrlLine = document.getElementById("ctrlLine_"+id);
		if (!ctrlLine) {
			ctrlLine = document.createElementNS(svgns, "line");
			assignAttributes(ctrlLine, {
				'id': "ctrlLine_"+id,
				'stroke': "#555",
				'stroke-width': 1,
				"style": "pointer-events:none"
			});
			ctrlLine = ctrlPointGripContainer.appendChild(ctrlLine);
		}
		
		assignAttributes(ctrlLine, {
			'x1': source_x,
			'y1': source_y,
			'x2': x,
			'y2': y,
			'display': "inline"
		});
		
		var pointGrip = document.getElementById("ctrlpointgrip_"+id);
		// create it
		if (!pointGrip) {
			pointGrip = document.createElementNS(svgns, "circle");
			assignAttributes(pointGrip, {
				'id': "ctrlpointgrip_" + id,
				'display': "none",
				'r': 4,
				'fill': "#0FF",
				'stroke': "#55F",
				'stroke-width': 1,
				'cursor': 'move',
				'style': 'pointer-events:all',
				'xlink:title': 'Drag control point to adjust curve properties'
			});
			pointGrip = ctrlPointGripContainer.appendChild(pointGrip);
		}
		
		assignAttributes(pointGrip, {
			'cx': x,
			'cy': y,
			'display': "inline"
		});
	}

	var removeControlPointGrips = function(index) {
		for(var i=1; i <= 2; i++) {
			$("#ctrlpointgrip_" + index + "c" + i + ",#ctrlLine_" + index + "c" + i).attr("display", "none");
		}
	}

	// - in create mode, the element's opacity is set properly, we create an InsertElementCommand
	//   and store it on the Undo stack
	// - in move/resize mode, the element's attributes which were affected by the move/resize are
	//   identified, a ChangeElementCommand is created and stored on the stack for those attrs
	//   this is done in when we recalculate the selected dimensions()
	var mouseUp = function(evt)
	{
		var tempJustSelected = justSelected;
		justSelected = null;
		if (!started) return;

		var pt = transformPoint( evt.pageX, evt.pageY, root_sctm );
		var mouse_x = pt.x;
		var mouse_y = pt.y;
		var x = mouse_x / current_zoom;
		var y = mouse_y / current_zoom;
				
		started = false;
		var element = svgdoc.getElementById(getId());
		var keep = false;
		switch (current_mode)
		{
			// intentionally fall-through to select here
			case "resize":
			case "multiselect":
				if (rubberBox != null) {
					rubberBox.setAttribute("display", "none");
					curBBoxes = [];
				}
				current_mode = "select";
			case "select":
				if (selectedElements[0] != null) {
					// if we only have one selected element
					if (selectedElements[1] == null) {
						// set our current stroke/fill properties to the element's
						var selected = selectedElements[0];
						if (selected.tagName != "g" && selected.tagName != "image") {
							cur_shape.fill = selected.getAttribute("fill");
							cur_shape.fill_opacity = selected.getAttribute("fill-opacity");
							cur_shape.stroke = selected.getAttribute("stroke");
							cur_shape.stroke_opacity = selected.getAttribute("stroke-opacity");
							cur_shape.stroke_width = selected.getAttribute("stroke-width");
							cur_shape.stroke_style = selected.getAttribute("stroke-dasharray");
						}
						if (selected.tagName == "text") {
							cur_text.font_size = selected.getAttribute("font-size");
							cur_text.font_family = selected.getAttribute("font-family");
						}

						selectorManager.requestSelector(selected).showGrips(true);
					}
					// always recalculate dimensions to strip off stray identity transforms
					recalculateAllSelectedDimensions();
					// if it was being dragged/resized
					if (x != start_x || y != start_y) {
						var len = selectedElements.length;
						for	(var i = 0; i < len; ++i) {
							if (selectedElements[i] == null) break;
							if(selectedElements[i].tagName != 'g') {
								// Not needed for groups (incorrectly resizes elems), possibly not needed at all?
								selectorManager.requestSelector(selectedElements[i]).resize();
							}
						}
					}
					// no change in position/size, so maybe we should move to pathedit
					else {
						var t = evt.target;
						if (selectedElements[0].nodeName == "path" && selectedElements[1] == null) {
							if (current_path == t) {
								current_mode = "pathedit";

								// recalculate current_path_pts
								recalcPathPoints();
								canvas.clearSelection();
								// save the path's bbox
								selectedBBoxes[0] = canvas.getBBox(current_path);
								addAllPointGripsToPath();
								canvas.addNodeToSelection(0);
							} // going into pathedit mode
							else {
								current_path = t;
							}
						} // if it was a path
						// else, if it was selected and this is a shift-click, remove it from selection
						else if (evt.shiftKey && tempJustSelected != t) {
							canvas.removeFromSelection([t]);
						}
					} // no change in mouse position
				}
				// we return immediately from select so that the obj_num is not incremented
				return;
				break;
			case "zoom":
				if (rubberBox != null) {
					rubberBox.setAttribute("display", "none");
				}
				var factor = evt.shiftKey?.5:2;
				call("zoomed", {
					'x': Math.min(start_x,x),
					'y': Math.min(start_y,y),
					'width': Math.abs(x-start_x),
					'height': Math.abs(y-start_y),
					'factor': factor
				});
				return;
			case "fhpath":
				// Check that the path contains at least 2 points; a degenerate one-point path
				// causes problems.
				// Webkit ignores how we set the points attribute with commas and uses space
				// to separate all coordinates, see https://bugs.webkit.org/show_bug.cgi?id=29870
				var coords = element.getAttribute('points');
				var commaIndex = coords.indexOf(',');
				if (commaIndex >= 0) {
					keep = coords.indexOf(',', commaIndex+1) >= 0;
				} else {
					keep = coords.indexOf(' ', coords.indexOf(' ')+1) >= 0;
				}
				break;
			case "line":
				keep = (element.x1.baseVal.value != element.x2.baseVal.value ||
				        element.y1.baseVal.value != element.y2.baseVal.value);
				break;
			case "square":
			case "rect":
				keep = (element.width.baseVal.value && element.height.baseVal.value);
				break;
			case "image":
				keep = (element.width.baseVal.value && element.height.baseVal.value);
				break;
			case "circle":
				keep = (element.r.baseVal.value);
				break;
			case "ellipse":
				keep = (element.rx.baseVal.value && element.ry.baseVal.value);
				break;
			case "fhellipse":
				if ((freehand_max_x - freehand_min_x) > 0 &&
				    (freehand_max_y - freehand_min_y) > 0) {
				    element = addSvgElementFromJson({
						"element": "ellipse",
						"attr": {
							"cx": (freehand_min_x + freehand_max_x) / 2,
							"cy": (freehand_min_y + freehand_max_y) / 2,
							"rx": (freehand_max_x - freehand_min_x) / 2,
							"ry": (freehand_max_y - freehand_min_y) / 2,
							"id": getId(),
							"fill": cur_shape.fill,
							"stroke": cur_shape.stroke,
							"stroke-width": cur_shape.stroke_width,
							"stroke-dasharray": cur_shape.stroke_style,
							"opacity": cur_shape.opacity,
							"stroke-opacity": cur_shape.stroke_opacity,
							"fill-opacity": cur_shape.fill_opacity,
							"style": "pointer-events:inherit"
						}
					});
					call("changed",[element]);
					keep = true;
				}
				break;
			case "fhrect":
				if ((freehand_max_x - freehand_min_x) > 0 &&
				    (freehand_max_y - freehand_min_y) > 0) {
				    element = addSvgElementFromJson({
						"element": "rect",
						"attr": {
							"x": freehand_min_x,
							"y": freehand_min_y,
							"width": (freehand_max_x - freehand_min_x),
							"height": (freehand_max_y - freehand_min_y),
							"id": getId(),
							"fill": cur_shape.fill,
							"stroke": cur_shape.stroke,
							"stroke-width": cur_shape.stroke_width,
							"stroke-dasharray": cur_shape.stroke_style,
							"opacity": cur_shape.opacity,
							"stroke-opacity": cur_shape.stroke_opacity,
							"fill-opacity": cur_shape.fill_opacity,
							"style": "pointer-events:inherit"
						}
					});
					call("changed",[element]);
					keep = true;
				}
				break;
			case "text":
				keep = true;
				canvas.clearSelection();
				break;
			case "path":
				// set element to null here so that it is not removed nor finalized
				element = null;
				// continue to be set to true so that mouseMove happens
				started = true;
				var stretchy = document.getElementById("path_stretch_line");
				if (!stretchy) {
					stretchy = document.createElementNS(svgns, "line");
					assignAttributes(stretchy, {
						'id': "path_stretch_line",
						'stroke': "blue",
						'stroke-width': "0.5"
					});
					stretchy = document.getElementById("selectorParentGroup").appendChild(stretchy);
				}
				stretchy.setAttribute("display", "inline");

				// if pts array is empty, create path element with M at current point
				if (current_path_pts.length == 0) {
					current_path_pts.push(x);
					current_path_pts.push(y);
					d_attr = "M" + x + "," + y + " ";
					addSvgElementFromJson({
						"element": "path",
						"attr": {
							"d": d_attr,
							"id": getNextId(),
							"fill": cur_shape.fill,
							"fill-opacity": cur_shape.fill_opacity,
							"stroke": cur_shape.stroke,
							"stroke-width": cur_shape.stroke_width,
							"stroke-dasharray": cur_shape.stroke_style,
							"stroke-opacity": cur_shape.stroke_opacity,
							"opacity": cur_shape.opacity / 2,
							"style": "pointer-events:inherit"
						}
					});
					// set stretchy line to first point
					assignAttributes(stretchy, {
						'x1': mouse_x,
						'y1': mouse_y,
						'x2': mouse_x,
						'y2': mouse_y
					});
					addPointGripToPath(mouse_x,mouse_y,0);
				}
				else {
					// determine if we clicked on an existing point
					var i = current_path_pts.length;
					var FUZZ = 6/current_zoom;
					var clickOnPoint = false;
					while(i) {
						i -= 2;
						var px = current_path_pts[i], py = current_path_pts[i+1];
						// found a matching point
						if ( x >= (px-FUZZ) && x <= (px+FUZZ) && y >= (py-FUZZ) && y <= (py+FUZZ) ) {
							clickOnPoint = true;
							break;
						}
					}
					
					// get path element that we are in the process of creating
					var path = svgdoc.getElementById(getId());
					var len = current_path_pts.length;
					// if we clicked on an existing point, then we are done this path, commit it
					// (i,i+1) are the x,y that were clicked on
					if (clickOnPoint) {
						// if clicked on any other point but the first OR
						// the first point was clicked on and there are less than 3 points
						// then leave the path open
						// otherwise, close the path
						if (i == 0 && len >= 6) {
							// Create end segment
							var abs_x = current_path_pts[0];
							var abs_y = current_path_pts[1];
							d_attr += ['L',abs_x,',',abs_y,'z'].join('');
							path.setAttribute("d", d_attr);
						} else if(len < 3) {
							keep = false;
							break;
						}
						removeAllPointGripsFromPath();
						// this will signal to commit the path
						element = path;
						current_path_pts = [];
						started = false;
					}
					// else, create a new point, append to pts array, update path element
					else {
						var lastx = current_path_pts[len-2], lasty = current_path_pts[len-1];
						// we store absolute values in our path points array for easy checking above
						current_path_pts.push(x);
						current_path_pts.push(y);
						d_attr += "L" + round(x) + "," + round(y) + " ";
						path.setAttribute("d", d_attr);

						// set stretchy line to latest point
						assignAttributes(stretchy, {
							'x1': mouse_x,
							'y1': mouse_y,
							'x2': mouse_x,
							'y2': mouse_y
						});
						addPointGripToPath(mouse_x,mouse_y,(current_path_pts.length/2 - 1));
					}
					keep = true;
				}
				break;
			case "pathedit":
				keep = true;
				element = null;
				// if we were dragging a path point, stop it now
				if (current_path_pt_drag != -1) {
					current_path_pt_drag = -1;
					
					var batchCmd = new BatchCommand("Edit Path");
					// the attribute changes we want to undo
					var oldvalues = {};
					oldvalues["d"] = current_path_oldd;
					
					// If the path was rotated, we must now pay the piper:
					// Every path point must be rotated into the rotated coordinate system of 
					// its old center, then determine the new center, then rotate it back
					// This is because we want the path to remember its rotation
					var angle = canvas.getRotationAngle(current_path, true);
	
					if (angle) {
						var box = canvas.getBBox(current_path);
						var oldbox = selectedBBoxes[0];
						var oldcx = oldbox.x + oldbox.width/2,
							oldcy = oldbox.y + oldbox.height/2,
							newcx = box.x + box.width/2,
							newcy = box.y + box.height/2;
						
						// un-rotate the new center to the proper position
						var dx = newcx - oldcx,
							dy = newcy - oldcy;
						var r = Math.sqrt(dx*dx + dy*dy);
						var theta = Math.atan2(dy,dx) + angle;
						newcx = r * Math.cos(theta) + oldcx;
						newcy = r * Math.sin(theta) + oldcy;
						
						var getRotVals = function(x, y) {
							dx = x - oldcx;
							dy = y - oldcy;
							
							// rotate the point around the old center
							r = Math.sqrt(dx*dx + dy*dy);
							theta = Math.atan2(dy,dx) + angle;
							dx = r * Math.cos(theta) + oldcx;
							dy = r * Math.sin(theta) + oldcy;
							
							// dx,dy should now hold the actual coordinates of each
							// point after being rotated

							// now we want to rotate them around the new center in the reverse direction
							dx -= newcx;
							dy -= newcy;
							
							r = Math.sqrt(dx*dx + dy*dy);
							theta = Math.atan2(dy,dx) - angle;
							
							return {'x':(r * Math.cos(theta) + newcx)/1,
								'y':(r * Math.sin(theta) + newcy)/1};
						}
						
						var list = current_path.pathSegList;
						var i = list.numberOfItems;
						while (i) {
							i -= 1;
							var seg = list.getItem(i);
							var type = seg.pathSegType;
							if(type == 1) continue;
							
							var rvals = getRotVals(seg.x,seg.y);
							var points = [rvals.x, rvals.y];
							if(seg.x1 != null && seg.x2 != null) {
								c_vals1 = getRotVals(seg.x1, seg.y1);
								c_vals2 = getRotVals(seg.x2, seg.y2);
								points.splice(points.length, 0, c_vals1.x , c_vals1.y, c_vals2.x, c_vals2.y);
							}
							replacePathSeg(type, i, points);
						} // loop for each point
	
						box = canvas.getBBox(current_path);						
						selectedBBoxes[0].x = box.x; selectedBBoxes[0].y = box.y;
						selectedBBoxes[0].width = box.width; selectedBBoxes[0].height = box.height;
						
						// now we must set the new transform to be rotated around the new center
						var rotate = "rotate(" + (angle * 180.0 / Math.PI) + " " + newcx + "," + newcy + ")";
						current_path.setAttribute("transform", rotate);
							
						if(document.getElementById("pathpointgrip_container")) {
							var pcx = newcx * current_zoom,
								pcy = newcy * current_zoom;
							var xform = ["rotate(", (angle*180.0/Math.PI), " ", pcx, ",", pcy, ")"].join("");
							setPointContainerTransform(xform);
						}
						resetPointGrips();
						updateSegLine(true);

					} // if rotated

					batchCmd.addSubCommand(new ChangeElementCommand(current_path, oldvalues, "path points"));
					addCommandToHistory(batchCmd);
					call("changed", [current_path]);
					
					// If connected, last point should equal first
					if(pathIsClosed()) {
						current_path_pts[current_path_pts.length-2] = getPathPoint(0,true)[0];
						current_path_pts[current_path_pts.length-1] = getPathPoint(0,true)[1];
					}
					updateSegLine();
					
					// make these changes undo-able
				} // if (current_path_pt_drag != -1)
				else if(current_ctrl_pt_drag != -1) {
					current_ctrl_pt_drag = -1;
					var batchCmd = new BatchCommand("Edit Path control points");
					batchCmd.addSubCommand(new ChangeElementCommand(current_path, {d:current_path_oldd}));
					addCommandToHistory(batchCmd);
					call("changed", [current_path]);
				} 	// else, move back to select mode
				else {
					current_mode = "select";
					removeAllPointGripsFromPath();
					canvas.clearSelection();
					canvas.addToSelection([evt.target]);
				}
				break;
			case "rotate":
				keep = true;
				element = null;
				current_mode = "select";
				var batchCmd = canvas.finishUndoableChange();
				if (!batchCmd.isEmpty()) { 
					addCommandToHistory(batchCmd);
				}
				// perform recalculation to weed out any stray identity transforms that might get stuck
				recalculateAllSelectedDimensions();
				break;
			default:
				console.log("Unknown mode in mouseup: " + current_mode);
				break;
		}
		if (!keep && element != null) {
			element.parentNode.removeChild(element);
			element = null;
			
			var t = evt.target;
			
			// if this element is in a group, go up until we reach the top-level group 
			// just below the layer groups
			// TODO: once we implement links, we also would have to check for <a> elements
			while (t.parentNode.parentNode.tagName == "g") {
				t = t.parentNode;
			}
			// if we are not in the middle of creating a path, and we've clicked on some shape, 
			// then go to Select mode.
			// WebKit returns <div> when the canvas is clicked, Firefox/Opera return <svg>
			if ( (current_mode != "path" || current_path_pts.length == 0) &&
				t.parentNode.id != "selectorParentGroup" &&
				t.id != "svgcanvas" && t.id != "svgroot") 
			{
				// switch into "select" mode if we've clicked on an element
				canvas.addToSelection([t], true);
				canvas.setMode("select");
			}
			
		} else if (element != null) {
			canvas.addedNew = true;
			element.setAttribute("opacity", cur_shape.opacity);
			cleanupElement(element);
			selectorManager.update();
 			if(current_mode == "path") {
 				current_path = element;
				current_mode = "pathedit";
				recalcPathPoints();
				addAllPointGripsToPath(current_path_pts.length/2 - 1);
 			} else if (current_mode == "text" || current_mode == "image") {
 				// keep us in the tool we were in unless it was a text or image element
				canvas.addToSelection([element], true);
			}
			// we create the insert command that is stored on the stack
			// undo means to call cmd.unapply(), redo means to call cmd.apply()
			addCommandToHistory(new InsertElementCommand(element));
			call("changed",[element]);
		}
		
		start_transform = null;
	};

// public functions

	// Group: Serialization

	// Function: open
	// Calls the 'opened' handler and sends the SVG XML text.  Clients of the SvgCanvas bind
	// their load function (typically calls to setSvgString() to the 'opened' event.
	this.open = function(str) {
		// Nothing by default, handled by optional widget/extension
		call("opened", str);
	};

	// Function: save
	// Serializes the current drawing into SVG XML text and returns it to the 'saved' handler.
	// This function also includes the XML prolog.  Clients of the SvgCanvas bind their save
	// function to the 'saved' event.
	//
	// Returns: 
	// Nothing
	this.save = function(opts) {
		// remove the selected outline before serializing
		this.clearSelection();
		// Update save options if provided
		if(opts) $.extend(save_options, opts);
		save_options.apply = true;
		
		var str = "<?xml version=\"1.0\" standalone=\"no\"?>\n";
		// no need for doctype, see http://jwatt.org/svg/authoring/#doctype-declaration
		str += svgCanvasToString();
		call("saved", str);
	};

	var walkTree = function(elem, cbFn){
		if (elem && elem.nodeType == 1) {
			cbFn(elem);
			var i = elem.childNodes.length;
			while (i--) {
				walkTree(elem.childNodes.item(i), cbFn);
			}
		}
	};
	
	// Function: getSvgString
	// Returns the current drawing as raw SVG XML text.
	//
	// Returns:
	// The current drawing as raw SVG XML text.
	this.getSvgString = function() {
		save_options.apply = false;
		return svgCanvasToString();
	};

	// Function: setSvgString
	// This function sets the current drawing as the input SVG XML.
	//
	// Parameters:
	// xmlString - The SVG as XML text.
	//
	// Returns:
	// This function returns false if the set was unsuccessful, true otherwise.
	this.setSvgString = function(xmlString) {
		try {
			// convert string into XML document
			var newDoc = Utils.text2xml(xmlString);
			// run it through our sanitizer to remove anything we do not support
	        sanitizeSvg(newDoc.documentElement);

			var batchCmd = new BatchCommand("Change Source");

        	// remove old svg document
    	    var oldzoom = svgroot.removeChild(svgcontent);
			batchCmd.addSubCommand(new RemoveElementCommand(oldzoom, svgroot));
        
    	    // set new svg document
        	svgcontent = svgroot.appendChild(svgdoc.importNode(newDoc.documentElement, true));
        	// change image href vals if possible
        	$(svgcontent).find('image').each(function() {
        		var image = this;
        		var val = this.getAttributeNS(xlinkns, "href");
				if(val.indexOf('data:') === 0) {
					// Check if an SVG-edit data URI
					var m = val.match(/svgedit_url=(.*?);/);
					if(m) {
						var url = decodeURIComponent(m[1]);
						$(new Image()).load(function() {
							image.setAttributeNS(xlinkns,'href',url);
						}).attr('src',url);
					}
				}
        		// Add to encodableImages if it loads
        		canvas.embedImage(val);
        	});
        	
        	// Fix XML for Opera/Win/Non-EN
			if(window.opera) {
				canvas.fixOperaXML(svgcontent, newDoc.documentElement);
			}
        	
			svgcontent.setAttribute('id', 'svgcontent');
			// determine proper size
			var w, h;
			if (svgcontent.getAttribute("viewBox")) {
				var vb = svgcontent.getAttribute("viewBox").split(' ');
				w = vb[2];
				h = vb[3];
			}
			// handle old content that doesn't have a viewBox
			else {
				w = svgcontent.getAttribute("width");
				h = svgcontent.getAttribute("height");
				svgcontent.setAttribute("viewBox", ["0", "0", w, h].join(" "));
			}
			
			// just to be safe, set width and height to 100%/100%
			// (removing causes bug in Webkit)
			svgcontent.setAttribute('width','100%');
			svgcontent.setAttribute('height','100%');
			batchCmd.addSubCommand(new InsertElementCommand(svgcontent));
			// update root to the correct size
			var changes = {};
			changes['width'] = svgroot.getAttribute('width');
			changes['height'] = svgroot.getAttribute('height');
			svgroot.setAttribute('width', w);
			svgroot.setAttribute('height', h);
			batchCmd.addSubCommand(new ChangeElementCommand(svgroot, changes));
			
			// reset zoom
			current_zoom = 1;
			
			// identify layers
			identifyLayers();
			
			canvas.clearSelection();
			addCommandToHistory(batchCmd);
			call("changed", [svgcontent]);
		} catch(e) {
			console.log(e);
			return false;
		}

		return true;
	};

	// Layer API Functions

	// Group: Layers

	var identifyLayers = function() {
		all_layers = [];
		var numchildren = svgcontent.childNodes.length;
		// loop through all children of svgcontent
		var orphans = [], layernames = [];
		for (var i = 0; i < numchildren; ++i) {
			var child = svgcontent.childNodes.item(i);
			// for each g, find its layer name
			if (child && child.nodeType == 1) {
				if (child.tagName == "g") {
					var name = $("title",child).text();
					// store layer and name in global variable
					if (name) {
						layernames.push(name);
						all_layers.push( [name,child] );
						current_layer = child;
						walkTree(child, function(e){e.setAttribute("style", "pointer-events:inherit");});
						current_layer.setAttribute("style", "pointer-events:none");
					}
					// if group did not have a name, it is an orphan
					else {
						orphans.push(child);
					}
				}
				// if child has a bbox (i.e. not a <title> or <defs> element), then it is an orphan
				else if(canvas.getBBox(child) && child.nodeName != 'defs') { // Opera returns a BBox for defs
					var bb = canvas.getBBox(child);
					orphans.push(child);
				}
			}
		}
		// create a new layer and add all the orphans to it
		if (orphans.length > 0) {
			var i = 1;
			while ($.inArray(("Layer " + i), layernames) != -1) { i++; }
			var newname = "Layer " + i;
			current_layer = svgdoc.createElementNS(svgns, "g");
			var layer_title = svgdoc.createElementNS(svgns, "title");
			layer_title.textContent = newname;
			current_layer.appendChild(layer_title);
			for (var j = 0; j < orphans.length; ++j) {
				current_layer.appendChild(orphans[j]);
			}
			current_layer = svgcontent.appendChild(current_layer);
			all_layers.push( [newname, current_layer] );
		}
		walkTree(current_layer, function(e){e.setAttribute("style","pointer-events:inherit");});
		current_layer.setAttribute("style","pointer-events:all");
	};
	
	// Function: createLayer
	// Creates a new top-level layer in the drawing with the given name, sets the current layer 
	// to it, and then clears the selection  This function then calls the 'changed' handler.
	// This is an undoable action.
	//
	// Parameters:
	// name - The given name
	this.createLayer = function(name) {
		var batchCmd = new BatchCommand("Create Layer");
		var new_layer = svgdoc.createElementNS(svgns, "g");
		var layer_title = svgdoc.createElementNS(svgns, "title");
		layer_title.textContent = name;
		new_layer.appendChild(layer_title);
		new_layer = svgcontent.appendChild(new_layer);
		batchCmd.addSubCommand(new InsertElementCommand(new_layer));
		addCommandToHistory(batchCmd);
		canvas.clearSelection();
		identifyLayers();
		canvas.setCurrentLayer(name);
		call("changed", [new_layer]);
	};
	
	// Function: deleteCurrentLayer
	// Deletes the current layer from the drawing and then clears the selection. This function 
	// then calls the 'changed' handler.  This is an undoable action.
	this.deleteCurrentLayer = function() {
		if (current_layer && all_layers.length > 1) {
			var batchCmd = new BatchCommand("Delete Layer");
			// actually delete from the DOM and store in our Undo History
			var parent = current_layer.parentNode;
			batchCmd.addSubCommand(new RemoveElementCommand(current_layer, parent));
			parent.removeChild(current_layer);
			addCommandToHistory(batchCmd);
			canvas.clearSelection();
			identifyLayers();
			canvas.setCurrentLayer(all_layers[all_layers.length-1][0]);
			call("changed", [svgcontent]);
			return true;
		}
		return false;
	};
	
	// Function: getNumLayers
	// Returns the number of layers in the current drawing.
	// 
	// Returns:
	// The number of layers in the current drawing.
	this.getNumLayers = function() {
		return all_layers.length;
	};
	
	// Function: getLayer
	// Returns the name of the ith layer. If the index is out of range, an empty string is returned.
	//
	// Parameters:
	// i - the zero-based index of the layer you are querying.
	// 
	// Returns:
	// The name of the ith layer
	this.getLayer = function(i) {
		if (i >= 0 && i < canvas.getNumLayers()) {
			return all_layers[i][0];
		}
		return "";
	};
	
	// Function: getCurrentLayer
	// Returns the name of the currently selected layer. If an error occurs, an empty string 
	// is returned.
	//
	// Returns:
	// The name of the currently active layer.
	this.getCurrentLayer = function() {
		for (var i = 0; i < all_layers.length; ++i) {
			if (all_layers[i][1] == current_layer) {
				return all_layers[i][0];
			}
		}
		return "";
	};
	
	// Function: setCurrentLayer
	// Sets the current layer. If the name is not a valid layer name, then this function returns
	// false. Otherwise it returns true. This is not an undo-able action.
	//
	// Parameters:
	// name - the name of the layer you want to switch to.
	//
	// Returns:
	// true if the current layer was switched, otherwise false
	this.setCurrentLayer = function(name) {
		name = toXml(name);
		for (var i = 0; i < all_layers.length; ++i) {
			if (name == all_layers[i][0]) {
				if (current_layer != all_layers[i][1]) {
					canvas.clearSelection();
					current_layer.setAttribute("style", "pointer-events:none");
					current_layer = all_layers[i][1];
					current_layer.setAttribute("style", "pointer-events:all");
				}
				return true;
			}
		}
		return false;
	};
	
	// Function: renameCurrentLayer
	// Renames the current layer. If the layer name is not valid (i.e. unique), then this function 
	// does nothing and returns false, otherwise it returns true. This is an undo-able action.
	// 
	// Parameters:
	// newname - the new name you want to give the current layer.  This name must be unique 
	// among all layer names.
	//
	// Returns:
	// true if the rename succeeded, false otherwise.
	this.renameCurrentLayer = function(newname) {
		if (current_layer) {
			var oldLayer = current_layer;
			// setCurrentLayer will return false if the name doesn't already exists
			if (!canvas.setCurrentLayer(newname)) {
				var batchCmd = new BatchCommand("Rename Layer");
				// find the index of the layer
				for (var i = 0; i < all_layers.length; ++i) {
					if (all_layers[i][1] == oldLayer) break;
				}
				var oldname = all_layers[i][0];
				all_layers[i][0] = toXml(newname);
			
				// now change the underlying title element contents
				var len = oldLayer.childNodes.length;
				for (var i = 0; i < len; ++i) {
					var child = oldLayer.childNodes.item(i);
					// found the <title> element, now append all the
					if (child && child.tagName == "title") {
						// wipe out old name 
						while (child.firstChild) { child.removeChild(child.firstChild); }
						child.textContent = newname;

						batchCmd.addSubCommand(new ChangeElementCommand(child, {"#text":oldname}));
						addCommandToHistory(batchCmd);
						call("changed", [oldLayer]);
						return true;
					}
				}
			}
			current_layer = oldLayer;
		}
		return false;
	};
	
	// Function: setCurrentLayerPosition
	// Changes the position of the current layer to the new value. If the new index is not valid, 
	// this function does nothing and returns false, otherwise it returns true. This is an
	// undo-able action.
	//
	// Parameters:
	// newpos - The zero-based index of the new position of the layer.  This should be between
	// 0 and (number of layers - 1)
	// 
	// Returns:
	// true if the current layer position was changed, false otherwise.
	this.setCurrentLayerPosition = function(newpos) {
		if (current_layer && newpos >= 0 && newpos < all_layers.length) {
			for (var oldpos = 0; oldpos < all_layers.length; ++oldpos) {
				if (all_layers[oldpos][1] == current_layer) break;
			}
			// some unknown error condition (current_layer not in all_layers)
			if (oldpos == all_layers.length) { return false; }
			
			if (oldpos != newpos) {
				// if our new position is below us, we need to insert before the node after newpos
				var refLayer = null;
				var oldNextSibling = current_layer.nextSibling;
				if (newpos > oldpos ) {
					if (newpos < all_layers.length-1) {
						refLayer = all_layers[newpos+1][1];
					}
				}
				// if our new position is above us, we need to insert before the node at newpos
				else {
					refLayer = all_layers[newpos][1];
				}
				svgcontent.insertBefore(current_layer, refLayer);
				addCommandToHistory(new MoveElementCommand(current_layer, oldNextSibling, svgcontent));
				
				identifyLayers();
				canvas.setCurrentLayer(all_layers[newpos][0]);
				
				return true;
			}
		}
		
		return false;
	};
	
	// Function: getLayerVisibility
	// Returns whether the layer is visible.  If the layer name is not valid, then this function
	// returns false.
	//
	// Parameters:
	// layername - the name of the layer which you want to query.
	//
	// Returns:
	// The visibility state of the layer, or false if the layer name was invalid.
	this.getLayerVisibility = function(layername) {
		// find the layer
		var layer = null;
		for (var i = 0; i < all_layers.length; ++i) {
			if (all_layers[i][0] == layername) {
				layer = all_layers[i][1];
				break;
			}
		}
		if (!layer) return false;
		return (layer.getAttribute("display") != "none");
	};
	
	// Function: setLayerVisibility
	// Sets the visibility of the layer. If the layer name is not valid, this function return 
	// false, otherwise it returns true. This is an undo-able action.
	//
	// Parameters:
	// layername - the name of the layer to change the visibility
	// bVisible - true/false, whether the layer should be visible
	//
	// Returns:
	// true if the layer's visibility was set, false otherwise
	this.setLayerVisibility = function(layername, bVisible) {
		// find the layer
		var layer = null;
		for (var i = 0; i < all_layers.length; ++i) {
			if (all_layers[i][0] == layername) {
				layer = all_layers[i][1];
				break;
			}
		}
		if (!layer) return false;
		
		var oldDisplay = layer.getAttribute("display");
		if (!oldDisplay) oldDisplay = "inline";
		layer.setAttribute("display", bVisible ? "inline" : "none");
		addCommandToHistory(new ChangeElementCommand(layer, {"display":oldDisplay}, "Layer Visibility"));
		
		if (layer == current_layer) {
			canvas.clearSelection();
		}
//		call("changed", [selected]);
		
		return true;
	};
	
	// Function: moveSelectedToLayer
	// Moves the selected elements to layername. If the name is not a valid layer name, then false 
	// is returned.  Otherwise it returns true. This is an undo-able action.
	//
	// Parameters:
	// layername - the name of the layer you want to which you want to move the selected elements
	//
	// Returns:
	// true if the selected elements were moved to the layer, false otherwise.
	this.moveSelectedToLayer = function(layername) {
		// find the layer
		var layer = null;
		for (var i = 0; i < all_layers.length; ++i) {
			if (all_layers[i][0] == layername) {
				layer = all_layers[i][1];
				break;
			}
		}
		if (!layer) return false;
		
		var batchCmd = new BatchCommand("Move Elements to Layer");
		
		// loop for each selected element and move it
		var selElems = selectedElements;
		var i = selElems.length;
		while (i--) {
			var elem = selElems[i];
			if (!elem) continue;
			var oldNextSibling = elem.nextSibling;
			// TODO: this is pretty brittle!
			var oldLayer = elem.parentNode;
			layer.appendChild(elem);
			batchCmd.addSubCommand(new MoveElementCommand(elem, oldNextSibling, oldLayer));
		}
		
		addCommandToHistory(batchCmd);
		
		return true;
	};
	
	// Function: getLayerOpacity
	// Returns the opacity of the given layer.  If the input name is not a layer, null is returned.
	//
	// Parameters: 
	// layername - name of the layer on which to get the opacity
	//
	// Returns:
	// The opacity value of the given layer.  This will be a value between 0.0 and 1.0, or null
	// if layername is not a valid layer
	this.getLayerOpacity = function(layername) {
		for (var i = 0; i < all_layers.length; ++i) {
			if (all_layers[i][0] == layername) {
				var g = all_layers[i][1];
				var opacity = g.getAttribute("opacity");
				if (!opacity) {
					opacity = "1.0";
				}
				return parseFloat(opacity);
			}
		}
		
		return null;
	};
	
	// Function: setLayerOpacity
	// Sets the opacity of the given layer.  If the input name is not a layer, nothing happens.
	// This is not an undo-able action.  NOTE: this function exists solely to apply
	// a highlighting/de-emphasis effect to a layer, when it is possible for a user to affect
	// the opacity of a layer, we will need to allow this function to produce an undo-able action.
	// If opacity is not a value between 0.0 and 1.0, then nothing happens.
	//
	// Parameters:
	// layername - name of the layer on which to set the opacity
	// opacity - a float value in the range 0.0-1.0
	this.setLayerOpacity = function(layername, opacity) {
		if (opacity < 0.0 || opacity > 1.0) return;
		for (var i = 0; i < all_layers.length; ++i) {
			if (all_layers[i][0] == layername) {
				var g = all_layers[i][1];
				g.setAttribute("opacity", opacity);
				break;
			}
		}
	};

	// Function: clear
	// Clears the current document.  This is not an undoable action.
	this.clear = function() {
		current_path_pts = [];

		// clear the svgcontent node
		var nodes = svgcontent.childNodes;
		var len = svgcontent.childNodes.length;
		var i = 0;
		this.clearSelection();
		for(var rep = 0; rep < len; rep++){
			if (nodes[i].nodeType == 1) { // element node
				svgcontent.removeChild(nodes[i]);
			} else {
				i++;
			}
		}
		// create empty first layer
		all_layers = [];
		canvas.createLayer("Layer 1");
		
		// clear the undo stack
		resetUndoStack();
		// reset the selector manager
		selectorManager.initGroup();
		// reset the rubber band box
		rubberBox = selectorManager.getRubberBandBox();
		
		call("cleared");
	};
	
	// TODO: should this be an 'internal' function?
	this.clearPath = function(remove) {
		if(remove && current_mode == "path") {
			var elem = svgdoc.getElementById(getId());
			if(elem) elem.parentNode.removeChild(elem);
		}
		removeAllPointGripsFromPath();
		current_path_pts = [];
		current_path_pt = -1;
	};
	
	// TODO: should this be an 'internal' function?
	this.getNodePoint = function() {	
		if(current_path_pt != -1) {
			var pt = getPathPoint(current_path_pt, true);
			var list = current_path.pathSegList;
			var segtype;
			if(list.numberOfItems > current_path_pt+1) {
				segtype = list.getItem(current_path_pt+1).pathSegType;
			} else {
				segtype = false;
			}
			return {
				x: pt[0],
				y: pt[1],
				type: segtype
			}
		} else {
			return false;
		}
	}

	this.linkControlPoints = function(linkPoints) {
		link_control_pts = linkPoints;
	}

	this.clonePathNode = function() {
	
		var pt = current_path_pt, list = current_path.pathSegList;

		var next_item = list.getItem(pt+1); 
		
		// Get point in between nodes
		if(next_item.pathSegType % 2 == 0) { // even num, so abs
			var cur_item = list.getItem(pt);
			var new_x = (next_item.x + cur_item.x) / 2;
			var new_y = (next_item.y + cur_item.y) / 2;
		} else {
			var new_x = next_item.x/2;
			var new_y = next_item.y/2;
		}
		
		var seg = current_path.createSVGPathSegLinetoAbs(new_x, new_y);
		list.insertItemBefore(seg, pt+1); // Webkit doesn't do this right.
		
		var abs_x = (getPathPoint(pt)[0] + new_x) * current_zoom;
		var abs_y = (getPathPoint(pt)[1] + new_y) * current_zoom;
		
		var last_num = current_path_pts.length/2;
		
		// Add new grip
		addPointGripToPath(abs_x, abs_y, last_num);

		// Update path_pts
		current_path_pts.splice(pt*2 + 2, 0, abs_x, abs_y);
		
		resetPointGrips();
		this.addNodeToSelection(pt+1);
		
	// 	current_path.setAttribute("d", convertToD(current_path.pathSegList));
	}

	this.deletePathNode = function() {
		var last_pt = current_path_pts.length/2 - 1;
		var pt = current_path_pt, list = current_path.pathSegList;
		var cur_item = list.getItem(pt);
		var next_item = list.getItem(pt+1);

		if(pt == 0) {
			var next_x = getPathPoint(1)[0];
			var next_y = getPathPoint(1)[1];
			// Make the next point be the "M" point
			replacePathSeg(2, 1, [next_x, next_y]);
			
			// Reposition last node
			var last_item = list.getItem(last_pt);
			replacePathSeg(4, last_pt, [next_x, next_y]);
			removeControlPointGrips(last_pt - 1);
			current_path_pts.splice(last_pt*2, 2, next_x, next_y);
			current_path_pts.splice(0, 2);
		} else {
			current_path_pts.splice(pt*2, 2);
		}

		list.removeItem(pt);
		
		resetPointGrips();
		
		if(window.opera) { // Opera repaints incorrectly
			var cp = $(current_path); cp.attr('d',cp.attr('d'));
		}
		
		this.addNodeToSelection(pt);
	}

	this.getResolution = function() {
// 		return [svgroot.getAttribute("width"), svgroot.getAttribute("height")];
		var vb = svgcontent.getAttribute("viewBox").split(' ');
		return {'w':vb[2], 'h':vb[3], 'zoom': current_zoom};
	};
	
	this.getImageTitle = function() {
		var childs = svgcontent.childNodes;
		for (var i=0; i<childs.length; i++) {
			if(childs[i].nodeName == 'title') {
				return childs[i].textContent;
			}
		}
		return '';
	}
	
	this.setImageTitle = function(newtitle) {
		var childs = svgcontent.childNodes, doc_title = false, old_title = '';
		
		var batchCmd = new BatchCommand("Change Image Title");
		
		for (var i=0; i<childs.length; i++) {
			if(childs[i].nodeName == 'title') {
				doc_title = childs[i];
				old_title = doc_title.textContent;
				break;
			}
		}
		if(!doc_title) {
			doc_title = svgdoc.createElementNS(svgns, "title");
			svgcontent.insertBefore(doc_title, svgcontent.firstChild);
		} 
		
		if(newtitle.length) {
			doc_title.textContent = newtitle;
		} else {
			// No title given, so element is not necessary
			doc_title.parentNode.removeChild(doc_title);
		}
		batchCmd.addSubCommand(new ChangeElementCommand(doc_title, {'#text': old_title}));
		addCommandToHistory(batchCmd);
	}
	
	this.setResolution = function(x, y) {
		var res = canvas.getResolution();
		var w = res.w, h = res.h;
		var batchCmd;

		if(x == 'fit') {
			canvas.clearSelection();

			// Get bounding box
			var bbox = canvas.getStrokedBBox();
			
			if(bbox) {
				batchCmd = new BatchCommand("Fit Canvas to Content");
				var visEls = canvas.getVisibleElements();
				$.each(visEls, function(i, item) {
					var sel_bb = item.getBBox();
					// TODO: we are not using the second argument here anymore, what to do?
					var cmd = recalculateDimensions(item, {
						x: sel_bb.x - bbox.x,
						y: sel_bb.y - bbox.y,
						width: sel_bb.width,
						height: sel_bb.height
					});
					batchCmd.addSubCommand(cmd);
				});
				x = Math.round(bbox.width);
				y = Math.round(bbox.height);
			} else {
				return false;
			}
		}
		x *= current_zoom;
		y *= current_zoom;
		if (x != w || y != h) {
			var handle = svgroot.suspendRedraw(1000);
			if(!batchCmd) {
				batchCmd = new BatchCommand("Change Image Dimensions");
			}
			svgroot.setAttribute('width', x);
			svgroot.setAttribute('height', y);
			batchCmd.addSubCommand(new ChangeElementCommand(svgroot, {"width":w, "height":h}));

			svgcontent.setAttribute("viewBox", ["0 0", x/current_zoom, y/current_zoom].join(' '));
			batchCmd.addSubCommand(new ChangeElementCommand(svgcontent, {"viewBox": ["0 0", w, h].join(' ')}));
		
			addCommandToHistory(batchCmd);
			svgroot.unsuspendRedraw(handle);
			call("changed", [svgcontent]);
		}
		return true;
	};

	this.setBBoxZoom = function(val, editor_w, editor_h) {
		var spacer = .85;
		var bb;
		var calcZoom = function(bb) {
			var w_zoom = Math.round((editor_w / bb.width)*100 * spacer)/100;
			var h_zoom = Math.round((editor_h / bb.height)*100 * spacer)/100;	
			var zoomlevel = Math.min(w_zoom,h_zoom);
			canvas.setZoom(zoomlevel);
			return {'zoom': zoomlevel, 'bbox': bb};
		}
		
		if(typeof val == 'object') {
			bb = val;
			if(bb.width == 0 || bb.height == 0) {
				var newzoom = bb.zoom?bb.zoom:current_zoom * bb.factor;
				canvas.setZoom(newzoom);
				return {'zoom': current_zoom, 'bbox': bb};
			}
			return calcZoom(bb);
		}
	
		switch (val) {
			case 'selection':
				if(!selectedElements[0]) return;
				var sel_elems = $.map(selectedElements, function(n){ if(n) return n; });
				bb = canvas.getStrokedBBox(sel_elems);
				break;
			case 'canvas':
				var res = canvas.getResolution();
				spacer = .95;
				bb = {width:res.w, height:res.h ,x:0, y:0};
				break;
			case 'content':
				bb = canvas.getStrokedBBox();
				break;
			case 'layer':
				bb = canvas.getStrokedBBox(canvas.getVisibleElements(current_layer));
				break;
			default:
				return;
		}
		return calcZoom(bb);
	}

	this.setZoom = function(zoomlevel) {
		var res = canvas.getResolution();
		svgroot.setAttribute("width", res.w * zoomlevel);
		svgroot.setAttribute("height", res.h * zoomlevel);
		current_zoom = zoomlevel;
		$.each(selectedElements, function(i, elem) {
			if(!elem) return;
			selectorManager.requestSelector(elem).resize();
		});
		if(current_mode == "pathedit") {
			resetPointGrips();
		}
	}

	this.getMode = function() {
		return current_mode;
	};

	this.setMode = function(name) {
		// toss out half-drawn path
		if (current_mode == "path" && current_path_pts.length > 0) {
			var elem = svgdoc.getElementById(getId());
			elem.parentNode.removeChild(elem);
			canvas.clearPath();
			canvas.clearSelection();
			started = false;
		}
		else if (current_mode == "pathedit") {
			canvas.clearPath();
		}
		
		cur_properties = (selectedElements[0] && selectedElements[0].nodeName == 'text') ? cur_text : cur_shape;
		current_mode = name;
	};

	this.getStrokeColor = function() {
		return cur_properties.stroke;
	};

	this.setStrokeColor = function(val,preventUndo) {
		cur_shape.stroke = val;
		cur_properties.stroke_paint = {type:"solidColor"};
		if (!preventUndo) 
			this.changeSelectedAttribute("stroke", val);
		else 
			this.changeSelectedAttributeNoUndo("stroke", val);
	};

	this.getFillColor = function() {
		return cur_properties.fill;
	};

	this.setFillColor = function(val,preventUndo) {
		cur_properties.fill = val;
		cur_properties.fill_paint = {type:"solidColor"};
		// take out any path/line elements when setting fill
		var elems = [];
		var i = selectedElements.length;
		while(i--) {
			var elem = selectedElements[i];
			if (elem && elem.tagName != "polyline" && elem.tagName != "line") {
				elems.push(elem);
			}
		}
		if (elems.length > 0) {
			if (!preventUndo) 
				this.changeSelectedAttribute("fill", val, elems);
			else
				this.changeSelectedAttributeNoUndo("fill", val, elems);
		}
	};

	var findDefs = function() {
		var defs = svgcontent.getElementsByTagNameNS(svgns, "defs");
		if (defs.length > 0) {
			defs = defs[0];
		}
		else {
			// first child is a comment, so call nextSibling
			defs = svgcontent.insertBefore( svgdoc.createElementNS(svgns, "defs" ), svgcontent.firstChild.nextSibling);
		}
		return defs;
	};

	var addGradient = function() {
		$.each(['stroke','fill'],function(i,type) {
			
			if(!cur_properties[type + '_paint'] || cur_properties[type + '_paint'].type == "solidColor") return;
			var grad = canvas[type + 'Grad'];
			// find out if there is a duplicate gradient already in the defs
			var duplicate_grad = findDuplicateGradient(grad);
			var defs = findDefs();
			// no duplicate found, so import gradient into defs
			if (!duplicate_grad) {
				var orig_grad = grad;
				grad = defs.appendChild( svgdoc.importNode(grad, true) );
				canvas.fixOperaXML(grad, orig_grad);
				// get next id and set it on the grad
				grad.id = getNextId();
			}
			else { // use existing gradient
				grad = duplicate_grad;
			}
			var functype = type=='fill'?'Fill':'Stroke';
			canvas['set'+ functype +'Color']("url(#" + grad.id + ")");
		});
	}

	var findDuplicateGradient = function(grad) {
		var defs = findDefs();
		var existing_grads = defs.getElementsByTagNameNS(svgns, "linearGradient");
		var i = existing_grads.length;
		while (i--) {
			var og = existing_grads.item(i);
			if (grad.getAttribute('x1') != og.getAttribute('x1') ||
				grad.getAttribute('y1') != og.getAttribute('y1') ||
				grad.getAttribute('x2') != og.getAttribute('x2') ||
				grad.getAttribute('y2') != og.getAttribute('y2')) 
			{
				continue;
			}

			// else could be a duplicate, iterate through stops
			var stops = grad.getElementsByTagNameNS(svgns, "stop");
			var ostops = og.getElementsByTagNameNS(svgns, "stop");

			if (stops.length != ostops.length) {
				continue;
			}

			var j = stops.length;
			while(j--) {
				var stop = stops.item(j);
				var ostop = ostops.item(j);

				if (stop.getAttribute('offset') != ostop.getAttribute('offset') ||
					stop.getAttribute('stop-opacity') != ostop.getAttribute('stop-opacity') ||
					stop.getAttribute('stop-color') != ostop.getAttribute('stop-color')) 
				{
					break;
				}
			}

			if (j == -1) {
				return og;
			}
		} // for each gradient in defs

		return null;
	};
	
	// Group: Fill and Stroke

	this.setStrokePaint = function(p, addGrad) {
		// make a copy
		var p = new $.jGraduate.Paint(p);
		this.setStrokeOpacity(p.alpha/100);

		// now set the current paint object
		cur_properties.stroke_paint = p;
		if (p.type == "solidColor") {
			this.setStrokeColor("#"+p.solidColor);
		}
		else if(p.type == "linearGradient") {
			canvas.strokeGrad = p.linearGradient;
			if(addGrad) addGradient(); 
		}
		else {
//			console.log("none!");
		}
	};

	this.setFillPaint = function(p, addGrad) {
		// make a copy
		var p = new $.jGraduate.Paint(p);
		this.setFillOpacity(p.alpha/100, true);

		// now set the current paint object
		cur_properties.fill_paint = p;
		if (p.type == "solidColor") {
			this.setFillColor("#"+p.solidColor);
		}
		else if(p.type == "linearGradient") {
			canvas.fillGrad = p.linearGradient;
			if(addGrad) addGradient(); 
		}
		else {
//			console.log("none!");
		}
	};

	this.getStrokeWidth = function() {
		return cur_properties.stroke_width;
	};

	// When attempting to set a line's width to 0, change it to 1 instead
	this.setStrokeWidth = function(val) {
		if(val == 0 && $.inArray(current_mode, ['line', 'path']) != -1) {
			canvas.setStrokeWidth(1);
			return;
		}
		cur_properties.stroke_width = val;
		this.changeSelectedAttribute("stroke-width", val);
	};

	this.getStrokeStyle = function() {
		return cur_shape.stroke_style;
	};

	this.setStrokeStyle = function(val) {
		cur_shape.stroke_style = val;
		this.changeSelectedAttribute("stroke-dasharray", val);
	};

	this.getOpacity = function() {
		return cur_shape.opacity;
	};

	this.setOpacity = function(val) {
		cur_shape.opacity = val;
		this.changeSelectedAttribute("opacity", val);
	};

	this.getFillOpacity = function() {
		return cur_shape.fill_opacity;
	};

	this.setFillOpacity = function(val, preventUndo) {
		cur_shape.fill_opacity = val;
		if (!preventUndo)
			this.changeSelectedAttribute("fill-opacity", val);
		else
			this.changeSelectedAttributeNoUndo("fill-opacity", val);
	};

	this.getStrokeOpacity = function() {
		return cur_shape.stroke_opacity;
	};

	this.setStrokeOpacity = function(val, preventUndo) {
		cur_shape.stroke_opacity = val;
		if (!preventUndo)
			this.changeSelectedAttribute("stroke-opacity", val);
		else
			this.changeSelectedAttributeNoUndo("stroke-opacity", val);
	};

	// returns an object that behaves like a SVGTransformList
	this.getTransformList = function(elem) {
		if (isWebkit) {
			var t = svgTransformLists[elem.id];
			if (!t) {
				svgTransformLists[elem.id] = new SVGEditTransformList(elem);
				t = svgTransformLists[elem.id];
			}
			return t;
		}
		else if (elem.transform) {
			return elem.transform.baseVal;
		}
		return null;
	};

	this.getBBox = function(elem) {
		var selected = elem || selectedElements[0];
		if (elem.nodeType != 1) return null;
		var ret = null;
		if(elem.nodeName == 'text' && selected.textContent == '') {
			selected.textContent = 'a'; // Some character needed for the selector to use.
			ret = selected.getBBox();
			selected.textContent = '';
		} else {
			try { ret = selected.getBBox(); } 
			catch(e) { ret = null; }
		}

		// get the bounding box from the DOM (which is in that element's coordinate system)
		return ret;
	};

	// we get the rotation angle in the tlist
	this.getRotationAngle = function(elem, to_rad) {
		var selected = elem || selectedElements[0];
		// find the rotation transform (if any) and set it
		var tlist = canvas.getTransformList(selected);
		var N = tlist.numberOfItems;
		for (var i = 0; i < N; ++i) {
			var xform = tlist.getItem(i);
			if (xform.type == 4) {
				return to_rad ? xform.angle * Math.PI / 180.0 : xform.angle;
			}
		}
		return 0.0;
	};

	// this should:
	// - remove any old rotations if present
	// - prepend a new rotation at the transformed center
	this.setRotationAngle = function(val,preventUndo) {
		// ensure val is the proper type
		val = parseFloat(val);
		var elem = selectedElements[0];
		var oldTransform = elem.getAttribute("transform");
		var bbox = elem.getBBox();
		var cx = round(bbox.x+bbox.width/2), cy = round(bbox.y+bbox.height/2);
		var tlist = canvas.getTransformList(elem);
		
		// only remove the real rotational transform if present (i.e. at index=0)
		if (tlist.numberOfItems > 0) {
			var xform = tlist.getItem(0);
			if (xform.type == 4) {
				tlist.removeItem(0);
			}
		}
		
		// find R_nc and insert it
		var center = transformPoint(cx,cy,transformListToTransform(tlist).matrix);
		var R_nc = svgroot.createSVGTransform();
		R_nc.setRotate(val, center.x, center.y);
		tlist.insertItemBefore(R_nc,0);
		
		if (!preventUndo) {
			// we need to undo it, then redo it so it can be undo-able! :)
			// TODO: figure out how to make changes to transform list undo-able cross-browser?
			var newTransform = elem.getAttribute("transform");
			elem.setAttribute("transform", oldTransform);
			this.changeSelectedAttribute("transform",newTransform,selectedElements);
		}
		var pointGripContainer = document.getElementById("pathpointgrip_container");
		if(elem.nodeName == "path" && pointGripContainer) {
			setPointContainerTransform(elem.getAttribute("transform"));
		}
		var selector = selectorManager.requestSelector(selectedElements[0]);
		selector.resize();
		selector.updateGripCursors(val);
	};

	this.each = function(cb) {
		$(svgroot).children().each(cb);
	};

	this.bind = function(event, f) {
	  var old = events[event];
		events[event] = f;
		return old;
	};

	this.setIdPrefix = function(p) {
		idprefix = p;
	};

	this.getBold = function() {
		// should only have one element selected
		var selected = selectedElements[0];
		if (selected != null && selected.tagName  == "text" &&
			selectedElements[1] == null) 
		{
			return (selected.getAttribute("font-weight") == "bold");
		}
		return false;
	};

	this.setBold = function(b) {
		var selected = selectedElements[0];
		if (selected != null && selected.tagName  == "text" &&
			selectedElements[1] == null) 
		{
			this.changeSelectedAttribute("font-weight", b ? "bold" : "normal");
		}
	};

	this.getItalic = function() {
		var selected = selectedElements[0];
		if (selected != null && selected.tagName  == "text" &&
			selectedElements[1] == null) 
		{
			return (selected.getAttribute("font-style") == "italic");
		}
		return false;
	};

	this.setItalic = function(i) {
		var selected = selectedElements[0];
		if (selected != null && selected.tagName  == "text" &&
			selectedElements[1] == null) 
		{
			this.changeSelectedAttribute("font-style", i ? "italic" : "normal");
		}
	};

	this.getFontFamily = function() {
		return cur_text.font_family;
	};

	this.setFontFamily = function(val) {
    	cur_text.font_family = val;
		this.changeSelectedAttribute("font-family", val);
	};

	this.getFontSize = function() {
		return cur_text.font_size;
	};

	this.setFontSize = function(val) {
		cur_text.font_size = val;
		this.changeSelectedAttribute("font-size", val);
	};

	this.getText = function() {
		var selected = selectedElements[0];
		if (selected == null) { return ""; }
		return selected.textContent;
	};

	this.setTextContent = function(val) {
		this.changeSelectedAttribute("#text", val);
	};

	this.setImageURL = function(val) {
		svgCanvas.changeSelectedAttribute("#href", val);
	};

	this.setRectRadius = function(val) {
		var selected = selectedElements[0];
		if (selected != null && selected.tagName == "rect") {
			var r = selected.getAttribute("rx");
			if (r != val) {
				selected.setAttribute("rx", val);
				selected.setAttribute("ry", val);
				addCommandToHistory(new ChangeElementCommand(selected, {"rx":r, "ry":r}, "Radius"));
				call("changed", [selected]);
			}
		}
	};
	
	this.setSegType = function(new_type) {
		var grip = $('#pathpointgrip_' + current_path_pt);
		var old_d = current_path.getAttribute('d');
		
		var index = grip[0].id.split('_')[1] - 0;
		
		var last_index = current_path_pts.length/2 - 1;
		var is_closed = pathIsClosed(); 

		if(!is_closed && index == last_index) {
			return; // Last point of unclosed path should do nothing
		} else if(index >= last_index && is_closed) {
			index = 0;
		}

		var next_index = index+1;
		var cur_x = getPathPoint(index)[0];
		var cur_y = getPathPoint(index)[1];
		var next_x = getPathPoint(next_index)[0];
		var next_y = getPathPoint(next_index)[1];
		
		if(!new_type) { // double-click, so just toggle
			var batchCmd = new BatchCommand("Toggle Path Segment Type");

			// Toggle segment to curve/straight line
			var old_type = current_path.pathSegList.getItem(index+1).pathSegType;
			
			new_type = (old_type == 6) ? 4 : 6;

		} else {
			new_type -= 0;
			var batchCmd = new BatchCommand("Change Path Segment Type");
		}
		
		var points;

		var bb = current_path.getBBox();
		
		switch ( new_type ) {
		case 6:
			var diff_x = next_x - cur_x;
			var diff_y = next_y - cur_y;
		
			var ct1_x = cur_x + (diff_y/2);
			var ct1_y = cur_y - (diff_x/2);
			var ct2_x = next_x + (diff_y/2);
			var ct2_y = next_y - (diff_x/2);
			
			points = [next_x,next_y, ct1_x,ct1_y, ct2_x,ct2_y];
			break;
		case 4:
			points = [next_x,next_y];
			removeControlPointGrips(index);
			break;
		}
		
		replacePathSeg(new_type, next_index, points);
		
		addAllPointGripsToPath(); 
		recalculateDimensions(current_path);
		updateSegLine(true);
		
		batchCmd.addSubCommand(new ChangeElementCommand(current_path, {d: old_d}));
		addCommandToHistory(batchCmd);
		call("changed", [current_path]);
	}
	
	this.quickClone = function(elem) {
		// Hack for Firefox bugs where text element features aren't updated
		if(navigator.userAgent.indexOf('Gecko/') == -1) return elem;
		var clone = elem.cloneNode(true)
		elem.parentNode.insertBefore(clone, elem);
		elem.parentNode.removeChild(elem);
		selectorManager.releaseSelector(elem);
		selectedElements[0] = clone;
		selectorManager.requestSelector(clone).showGrips(true);
		return clone;
	}

	// New functions for refactoring of Undo/Redo
	
	// this is the stack that stores the original values, the elements and
	// the attribute name for begin/finish
	var undoChangeStackPointer = -1;
	var undoableChangeStack = [];
	
	// This function tells the canvas to remember the old values of the 
	// attrName attribute for each element sent in.  The elements and values 
	// are stored on a stack, so the next call to finishUndoableChange() will 
	// pop the elements and old values off the stack, gets the current values
	// from the DOM and uses all of these to construct the undo-able command.
	this.beginUndoableChange = function(attrName, elems) {
		var p = ++undoChangeStackPointer;
		var i = elems.length;
		var oldValues = new Array(i), elements = new Array(i);
		while (i--) {
			var elem = elems[i];
			if (elem == null) continue;
			elements[i] = elem;
			oldValues[i] = elem.getAttribute(attrName);
		}
		undoableChangeStack[p] = {'attrName': attrName,
								'oldValues': oldValues,
								'elements': elements};
	};
	
	// This function makes the changes to the elements
	this.changeSelectedAttributeNoUndo = function(attr, newValue, elems) {
		var handle = svgroot.suspendRedraw(1000);
		if(current_mode == 'pathedit') {
			// Editing node
			var num = (attr == 'x')?0:1;
			var old_path_pts = $.map(current_path_pts, function(n){return n/current_zoom;});

			current_path_pts[current_path_pt*2 + num] = newValue-0;
			current_path_pt_drag = current_path_pt;
			updatePath(current_path_pts[current_path_pt*2], current_path_pts[current_path_pt*2 + 1], old_path_pts);
		}
		var elems = elems || selectedElements;
		var i = elems.length;
		while (i--) {
			var elem = elems[i];
			if (elem == null) continue;
			// Set x,y vals on elements that don't have them
			if((attr == 'x' || attr == 'y') && $.inArray(elem.tagName, ['g', 'polyline', 'path']) != -1) {
				var bbox = canvas.getStrokedBBox([elem]);
				var diff_x = attr == 'x' ? newValue - bbox.x : 0;
				var diff_y = attr == 'y' ? newValue - bbox.y : 0;
				canvas.moveSelectedElements(diff_x*current_zoom, diff_y*current_zoom, true);
				continue;
			}
			
			// only allow the transform/opacity attribute to change on <g> elements, slightly hacky
			if (elem.tagName == "g" && (attr != "transform" && attr != "opacity")) continue;
			var oldval = attr == "#text" ? elem.textContent : elem.getAttribute(attr);
			if (oldval == null)  oldval = "";
			if (oldval !== newValue) {
				if (attr == "#text") {
					var old_w = canvas.getBBox(elem).width;
					elem.textContent = newValue;
					elem = canvas.quickClone(elem);
					
					// Hoped to solve the issue of moving text with text-anchor="start",
					// but this doesn't actually fix it. Hopefully on the right track, though. -Fyrd
					
// 					var box=canvas.getBBox(elem), left=box.x, top=box.y, width=box.width,
// 						height=box.height, dx = width - old_w, dy=0;
// 					var angle = canvas.getRotationAngle(elem, true);
// 					if (angle) {
// 						var r = Math.sqrt( dx*dx + dy*dy );
// 						var theta = Math.atan2(dy,dx) - angle;
// 						dx = r * Math.cos(theta);
// 						dy = r * Math.sin(theta);
// 						
// 						elem.setAttribute('x', elem.getAttribute('x')-dx);
// 						elem.setAttribute('y', elem.getAttribute('y')-dy);
// 					}
					
				} else if (attr == "#href") {
					elem.setAttributeNS(xlinkns, "href", newValue);
        		}
				else elem.setAttribute(attr, newValue);
				selectedBBoxes[i] = this.getBBox(elem);
				// Use the Firefox quickClone hack for text elements with gradients or
				// where other text attributes are changed. 
				if(elem.nodeName == 'text') {
					if((newValue+'').indexOf('url') == 0 || $.inArray(attr, ['font-size','font-family','x','y']) != -1) {
						elem = canvas.quickClone(elem);
					}
				}
				// Timeout needed for Opera & Firefox
				setTimeout(function() {
					selectorManager.requestSelector(elem).resize();
				},0);
				// if this element was rotated, and we changed the position of this element
				// we need to update the rotational transform attribute 
				var angle = canvas.getRotationAngle(elem);
				if (angle != 0 && attr != "transform") {
					var tlist = canvas.getTransformList(elem);
					var n = tlist.numberOfItems;
					while (n--) {
						var xform = tlist.getItem(n);
						if (xform.type == 4) {
							var cx = round(selectedBBoxes[i].x + selectedBBoxes[i].width/2),
								cy = round(selectedBBoxes[i].y + selectedBBoxes[i].height/2);
							var newrot = svgroot.createSVGTransform();
							newrot.setRotate(angle, cx, cy);
							tlist.replaceItem(newrot, n);
							break;
						}
					}
				}
			} // if oldValue != newValue
		} // for each elem
		svgroot.unsuspendRedraw(handle);	
	};
	
	// This function returns a BatchCommand object which summarizes the
	// change since beginUndoableChange was called.  The command can then
	// be added to the command history
	this.finishUndoableChange = function() {
		var p = undoChangeStackPointer--;
		var changeset = undoableChangeStack[p];
		var i = changeset['elements'].length;
		var attrName = changeset['attrName'];
		var batchCmd = new BatchCommand("Change " + attrName);
		while (i--) {
			var elem = changeset['elements'][i];
			if (elem == null) continue;
			var changes = {};
			changes[attrName] = changeset['oldValues'][i];
			if (changes[attrName] != elem.getAttribute(attrName)) {
				batchCmd.addSubCommand(new ChangeElementCommand(elem, changes, attrName));
			}
		}
		undoableChangeStack[p] = null;
		return batchCmd;
	};

	// If you want to change all selectedElements, ignore the elems argument.
	// If you want to change only a subset of selectedElements, then send the
	// subset to this function in the elems argument.
	this.changeSelectedAttribute = function(attr, val, elems) {
		var elems = elems || selectedElements;
		canvas.beginUndoableChange(attr, elems);
		var i = elems.length;

		canvas.changeSelectedAttributeNoUndo(attr, val, elems);

		var batchCmd = canvas.finishUndoableChange();
		if (!batchCmd.isEmpty()) { 
			addCommandToHistory(batchCmd);
		}
	};

	$(container).mouseup(mouseUp);
	$(container).mousedown(mouseDown);
	$(container).mousemove(mouseMove);

	this.deleteSelectedElements = function() {
		var batchCmd = new BatchCommand("Delete Elements");
		var len = selectedElements.length;
		var selectedCopy = []; //selectedElements is being deleted
		for (var i = 0; i < len; ++i) {
			var selected = selectedElements[i];
			if (selected == null) break;

			var parent = selected.parentNode;
			var t = selected;
			// this will unselect the element and remove the selectedOutline
			selectorManager.releaseSelector(t);
			var elem = parent.removeChild(t);
			selectedCopy.push(selected) //for the copy
			selectedElements[i] = null;
			batchCmd.addSubCommand(new RemoveElementCommand(elem, parent));
		}
		if (!batchCmd.isEmpty()) addCommandToHistory(batchCmd);
		call("changed", selectedCopy);
		canvas.clearSelection();
	};
	
	this.groupSelectedElements = function() {
		var batchCmd = new BatchCommand("Group Elements");
		
		// create and insert the group element
		var g = addSvgElementFromJson({
								"element": "g",
								"attr": {
									"id": getNextId()
								}
							});
		batchCmd.addSubCommand(new InsertElementCommand(g));
		
		// now move all children into the group
		var i = selectedElements.length;
		while (i--) {
			var elem = selectedElements[i];
			if (elem == null) continue;
			var oldNextSibling = elem.nextSibling;
			var oldParent = elem.parentNode;
			g.appendChild(elem);
			batchCmd.addSubCommand(new MoveElementCommand(elem, oldNextSibling, oldParent));			
		}
		if (!batchCmd.isEmpty()) addCommandToHistory(batchCmd);
		
		// ensure selectors are at bottom and update selection
		selectorManager.update();
		canvas.clearSelection();
		canvas.addToSelection([g], true);
	};

	this.ungroupSelectedElement = function() {
		var g = selectedElements[0];
		if (g.tagName == "g") {
			var batchCmd = new BatchCommand("Ungroup Elements");
			var parent = g.parentNode;
			var anchor = g.previousSibling;
			var children = new Array(g.childNodes.length);
			var xform = g.getAttribute("transform");
			// get consolidated matrix
			var m = transformListToTransform(canvas.getTransformList(g)).matrix;

			// TODO: get all fill/stroke properties from the group that we are about to destroy
			// "fill", "fill-opacity", "fill-rule", "stroke", "stroke-dasharray", "stroke-dashoffset", 
			// "stroke-linecap", "stroke-linejoin", "stroke-miterlimit", "stroke-opacity", 
			// "stroke-width"
			// and then for each child, if they do not have the attribute (or the value is 'inherit'?)
			// then set the child's attribute

			// TODO: get the group's opacity and propagate it down to the children (multiply it
			// by the child's opacity (or 1.0)
			var i = 0;
			while (g.firstChild) {
				var elem = g.firstChild;
				var oldNextSibling = elem.nextSibling;
				var oldParent = elem.parentNode;
				children[i++] = elem = parent.insertBefore(elem, anchor);
				batchCmd.addSubCommand(new MoveElementCommand(elem, oldNextSibling, oldParent));

				// transfer the group's transform down to each child and then
				// call recalculateDimensions()				
				if (xform) {
					var oldxform = elem.getAttribute("transform");
					var changes = {};
					changes["transform"] = oldxform ? oldxform : "";

					var newxform = svgroot.createSVGTransform();
					var chtlist = canvas.getTransformList(elem);

					// [ gm ] [ chm ] = [ chm ] [ gm' ]
					// [ gm' ] = [ chm_inv ] [ gm ] [ chm ]
					var chm = transformListToTransform(chtlist).matrix,
						chm_inv = chm.inverse();
					var gm = matrixMultiply( chm_inv, m, chm );
					newxform.setMatrix(gm);
					chtlist.appendItem(newxform);
					
					batchCmd.addSubCommand(recalculateDimensions(elem));
				}
			}
			
			// remove transform and make it undo-able
			if (xform) {
				var changes = {};
				changes["transform"] = xform;
				g.setAttribute("transform", "");
				g.removeAttribute("transform");				
				batchCmd.addSubCommand(new ChangeElementCommand(g, changes));
			}

			// remove the group from the selection			
			canvas.clearSelection();
			
			// delete the group element (but make undo-able)
			g = parent.removeChild(g);
			batchCmd.addSubCommand(new RemoveElementCommand(g, parent));

			if (!batchCmd.isEmpty()) addCommandToHistory(batchCmd);
			
			// ensure selectors are at bottom and update selection
			selectorManager.update();
			canvas.addToSelection(children);
		}
	};

	this.moveToTopSelectedElement = function() {
		var selected = selectedElements[0];
		if (selected != null) {
			var t = selected;
			var oldParent = t.parentNode;
			var oldNextSibling = t.nextSibling;
			if (oldNextSibling == selectorManager.selectorParentGroup) oldNextSibling = null;
			t = t.parentNode.appendChild(t);
			addCommandToHistory(new MoveElementCommand(t, oldNextSibling, oldParent, "top"));
		}
	};

	this.moveToBottomSelectedElement = function() {
		var selected = selectedElements[0];
		if (selected != null) {
			var t = selected;
			var oldParent = t.parentNode;
			var oldNextSibling = t.nextSibling;
			if (oldNextSibling == selectorManager.selectorParentGroup) oldNextSibling = null;
			// first child is a comment, so call nextSibling
			var firstChild = t.parentNode.firstChild.nextSibling;
			if (firstChild.tagName == 'defs') {
				firstChild = firstChild.nextSibling;
			}
			t = t.parentNode.insertBefore(t, firstChild);
			addCommandToHistory(new MoveElementCommand(t, oldNextSibling, oldParent, "bottom"));
		}
	};

	this.moveSelectedElements = function(dx,dy,undoable) {
		// if undoable is not sent, default to true
		// if single values, scale them to the zoom
		if (dx.constructor != Array) {
			dx /= current_zoom;
			dy /= current_zoom;
		}
		var undoable = undoable || true;
		var batchCmd = new BatchCommand("position");
		var i = selectedElements.length;
		while (i--) {
			var selected = selectedElements[i];
			if (selected != null) {
				selectedBBoxes[i] = this.getBBox(selected);
				
				var xform = svgroot.createSVGTransform();
				var tlist = canvas.getTransformList(selected);
				
				// dx and dy could be arrays
				if (dx.constructor == Array) {
					selectedBBoxes[i].x += dx[i];
					selectedBBoxes[i].y += dy[i];
					xform.setTranslate(dx[i],dy[i]);
				} else {
					selectedBBoxes[i].x += dx;
					selectedBBoxes[i].y += dy;
					xform.setTranslate(dx,dy);
				}
				
				tlist.appendItem(xform);
				
				var cmd = recalculateDimensions(selected);
				if (cmd) {
					batchCmd.addSubCommand(cmd);
				}
				selectorManager.requestSelector(selected).resize();
			}
		}
		if (!batchCmd.isEmpty()) {
			if (undoable)
				addCommandToHistory(batchCmd);
			call("changed", selectedElements);
		}
	};

	this.getStrokedBBox = function(elems) {
		if(!elems) elems = canvas.getVisibleElements();
		if(!elems.length) return false;
		
		// Make sure the expected BBox is returned if the element is a group
		// FIXME: doesn't this mean that every time we call getStrokedBBox() that we are 
		// re-creating the getCheckedBBox() function?  shouldn't we make this a function 
		// at the 'canvas' level
		var getCheckedBBox = function(elem) {
			try {
				// TODO: Fix issue with rotated groups. Currently they work
				// fine in FF, but not in other browsers (same problem mentioned
				// in Issue 339 comment #2).
				
				var bb = elem.getBBox();
				var angle = canvas.getRotationAngle(elem);
				if ((angle && angle % 90) || hasMatrixTransform(canvas.getTransformList(elem))) {
					// Accurate way to get BBox of rotated element in Firefox:
					// Put element in group and get its BBox
					
					var good_bb = false;
					
					// Get the BBox from the raw path for these elements
					var elemNames = ['ellipse','path','line','polyline','polygon'];
					if($.inArray(elem.tagName, elemNames) != -1) {
						bb = good_bb = canvas.convertToPath(elem, true, angle);
					} else if(elem.tagName == 'rect') {
						// Look for radius
						var rx = elem.getAttribute('rx');
						var ry = elem.getAttribute('ry');
						if(rx || ry) {
							bb = good_bb = canvas.convertToPath(elem, true, angle);
						}
					}
					
					if(!good_bb) {
						var g = document.createElementNS(svgns, "g");
						var parent = elem.parentNode;
						parent.replaceChild(g, elem);
						g.appendChild(elem);
						bb = g.getBBox();
						parent.insertBefore(elem,g);
						parent.removeChild(g);
					}
					

					// Old method: Works by giving the rotated BBox,
					// this is (unfortunately) what Opera and Safari do
					// natively when getting the BBox of the parent group
// 						var angle = angle * Math.PI / 180.0;
// 						var rminx = Number.MAX_VALUE, rminy = Number.MAX_VALUE, 
// 							rmaxx = Number.MIN_VALUE, rmaxy = Number.MIN_VALUE;
// 						var cx = round(bb.x + bb.width/2),
// 							cy = round(bb.y + bb.height/2);
// 						var pts = [ [bb.x - cx, bb.y - cy], 
// 									[bb.x + bb.width - cx, bb.y - cy],
// 									[bb.x + bb.width - cx, bb.y + bb.height - cy],
// 									[bb.x - cx, bb.y + bb.height - cy] ];
// 						var j = 4;
// 						while (j--) {
// 							var x = pts[j][0],
// 								y = pts[j][1],
// 								r = Math.sqrt( x*x + y*y );
// 							var theta = Math.atan2(y,x) + angle;
// 							x = round(r * Math.cos(theta) + cx);
// 							y = round(r * Math.sin(theta) + cy);
// 		
// 							// now set the bbox for the shape after it's been rotated
// 							if (x < rminx) rminx = x;
// 							if (y < rminy) rminy = y;
// 							if (x > rmaxx) rmaxx = x;
// 							if (y > rmaxy) rmaxy = y;
// 						}
// 						
// 						bb.x = rminx;
// 						bb.y = rminy;
// 						bb.width = rmaxx - rminx;
// 						bb.height = rmaxy - rminy;
				}
			
				return bb;
			} catch(e) { return null; } 

		}
		var full_bb;
		$.each(elems, function() {
			if(full_bb) return;
			full_bb = getCheckedBBox(this);
		});
		
		// This shouldn't ever happen...
		if(full_bb == null) return null;
		
		if(elems.length == 1) return full_bb;
		
		var max_x = full_bb.x + full_bb.width;
		var max_y = full_bb.y + full_bb.height;
		var min_x = full_bb.x;
		var min_y = full_bb.y;
		
		// FIXME: same re-creation problem with this function as getCheckedBBox() above
		var getOffset = function(elem) {
			var sw = elem.getAttribute("stroke-width");
			var offset = 0;
			if (elem.getAttribute("stroke") != "none" && !isNaN(sw)) {
				offset += sw/2;
			}
			return offset;
		}
		
		$.each(elems, function(i, elem) {
			var cur_bb = getCheckedBBox(elem);
			if(!cur_bb) return;
			var offset = getOffset(elem);
			min_x = Math.min(min_x, cur_bb.x - offset);
			min_y = Math.min(min_y, cur_bb.y - offset);
		});
		
		full_bb.x = min_x;
		full_bb.y = min_y;
		
		$.each(elems, function(i, elem) {
			var cur_bb = getCheckedBBox(elem);
			if(!cur_bb) return;
			var offset = getOffset(elem);
			max_x = Math.max(max_x, cur_bb.x + cur_bb.width + offset);
			max_y = Math.max(max_y, cur_bb.y + cur_bb.height + offset);
		});
		
		full_bb.width = max_x - min_x;
		full_bb.height = max_y - min_y;
		return full_bb;
	}

	this.getVisibleElements = function(parent, includeBBox) {
		if(!parent) parent = $(svgcontent).children(); // Prevent layers from being included
		
		var contentElems = [];
		$(parent).children().each(function(i, elem) {
			try {
				var box = elem.getBBox();
				if (box) {
					var item = includeBBox?{'elem':elem, 'bbox':canvas.getStrokedBBox([elem])}:elem;
					contentElems.push(item);
				}
			} catch(e) {}
		});
		return contentElems.reverse();
	}
	
	this.cycleElement = function(next) {
		var cur_elem = selectedElements[0];
		var elem = false;
		var all_elems = this.getVisibleElements(current_layer);
		if (cur_elem == null) {
			var num = next?all_elems.length-1:0;
			elem = all_elems[num];
		} else {
			var i = all_elems.length;
			while(i--) {
				if(all_elems[i] == cur_elem) {
					var num = next?i-1:i+1;
					if(num >= all_elems.length) {
						num = 0;
					} else if(num < 0) {
						num = all_elems.length-1;
					} 
					elem = all_elems[num];
					break;
				} 
			}
		}		
		canvas.clearSelection();
		canvas.addToSelection([elem], true);
		call("selected", selectedElements);
	}

	var resetUndoStack = function() {
		undoStack = [];
		undoStackPointer = 0;
	};

	this.getUndoStackSize = function() { return undoStackPointer; };
	this.getRedoStackSize = function() { return undoStack.length - undoStackPointer; };

	this.getNextUndoCommandText = function() { 
		if (undoStackPointer > 0) 
			return undoStack[undoStackPointer-1].text;
		return "";
	};
	this.getNextRedoCommandText = function() { 
		if (undoStackPointer < undoStack.length) 
			return undoStack[undoStackPointer].text;
		return "";
	};

	this.undo = function() {
		if (undoStackPointer > 0) {
			this.clearSelection();
			removeAllPointGripsFromPath();
			var cmd = undoStack[--undoStackPointer];
			cmd.unapply();
			call("changed", cmd.elements());
		}
	};
	this.redo = function() {
		if (undoStackPointer < undoStack.length && undoStack.length > 0) {
			this.clearSelection();
			var cmd = undoStack[undoStackPointer++];
			cmd.apply();
			call("changed", cmd.elements());
		}
	};

	// this function no longer uses cloneNode because we need to update the id
	// of every copied element (even the descendants)
	// we also do it manually because Opera/Win/non-EN puts , instead of .
	var copyElem = function(el) {
		// manually create a copy of the element
		var new_el = document.createElementNS(svgns, el.nodeName);
		$.each(el.attributes, function(i, attr) {
			var ns = attr.nodeName == 'href' ? xlinkns : 
				attr.prefix == "xml" ? xmlns : null;
			new_el.setAttributeNS(ns, attr.nodeName, attr.nodeValue);
		});
		// set the copied element's new id
		new_el.removeAttribute("id");
		new_el.id = getNextId();
		// manually increment obj_num because our cloned elements are not in the DOM yet
		obj_num++; 
		
		// now create copies of all children
		$.each(el.childNodes, function(i, child) {
			switch(child.nodeType) {
				case 1: // element node
					new_el.appendChild(copyElem(child));
					break;
				case 3: // text node
					new_el.textContent = child.nodeValue;
					break;
				default:
					break;
			}
		});
		return new_el;
	};
	
	// this creates deep DOM copies (clones) of all selected elements
	this.cloneSelectedElements = function() {
		var batchCmd = new BatchCommand("Clone Elements");
		// find all the elements selected (stop at first null)
		var len = selectedElements.length;
		for (var i = 0; i < len; ++i) {
			var elem = selectedElements[i];
			if (elem == null) break;
		}
		// use slice to quickly get the subset of elements we need
		var copiedElements = selectedElements.slice(0,i);
		this.clearSelection();
		// note that we loop in the reverse way because of the way elements are added
		// to the selectedElements array (top-first)
		var i = copiedElements.length;
		while (i--) {
			// clone each element and replace it within copiedElements
			var elem = copiedElements[i] = copyElem(copiedElements[i]);
			current_layer.appendChild(elem);
			batchCmd.addSubCommand(new InsertElementCommand(elem));
		}
		
		if (!batchCmd.isEmpty()) {
			this.addToSelection(copiedElements.reverse()); // Need to reverse for correct selection-adding
			this.moveSelectedElements(20,20,false);
			addCommandToHistory(batchCmd);
			call("selected", selectedElements);
		}
	};

	// aligns selected elements (type is a char - see switch below for explanation)
	// relative_to can be "selected", "largest", "smallest", "page"
	this.alignSelectedElements = function(type, relative_to) {
		var bboxes = [], angles = [];
		var minx = Number.MAX_VALUE, maxx = Number.MIN_VALUE, miny = Number.MAX_VALUE, maxy = Number.MIN_VALUE;
		var curwidth = Number.MIN_VALUE, curheight = Number.MIN_VALUE;
		var len = selectedElements.length;
		if (!len) return;
		for (var i = 0; i < len; ++i) {
			if (selectedElements[i] == null) break;
			var elem = selectedElements[i];
			bboxes[i] = canvas.getStrokedBBox([elem]);
			
			// now bbox is axis-aligned and handles rotation
			switch (relative_to) {
				case 'smallest':
					if ( (type == 'l' || type == 'c' || type == 'r') && (curwidth == Number.MIN_VALUE || curwidth > bboxes[i].width) ||
					     (type == 't' || type == 'm' || type == 'b') && (curheight == Number.MIN_VALUE || curheight > bboxes[i].height) ) {
						minx = bboxes[i].x;
						miny = bboxes[i].y;
						maxx = bboxes[i].x + bboxes[i].width;
						maxy = bboxes[i].y + bboxes[i].height;
						curwidth = bboxes[i].width;
						curheight = bboxes[i].height;
					}
					break;
				case 'largest':
					if ( (type == 'l' || type == 'c' || type == 'r') && (curwidth == Number.MIN_VALUE || curwidth < bboxes[i].width) ||
					     (type == 't' || type == 'm' || type == 'b') && (curheight == Number.MIN_VALUE || curheight < bboxes[i].height) ) {
						minx = bboxes[i].x;
						miny = bboxes[i].y;
						maxx = bboxes[i].x + bboxes[i].width;
						maxy = bboxes[i].y + bboxes[i].height;
						curwidth = bboxes[i].width;
						curheight = bboxes[i].height;
					}
					break;
				default: // 'selected'
					if (bboxes[i].x < minx) minx = bboxes[i].x;
					if (bboxes[i].y < miny) miny = bboxes[i].y;
					if (bboxes[i].x + bboxes[i].width > maxx) maxx = bboxes[i].x + bboxes[i].width;
					if (bboxes[i].y + bboxes[i].height > maxy) maxy = bboxes[i].y + bboxes[i].height;
					break;
			}
		} // loop for each element to find the bbox and adjust min/max

		if (relative_to == 'page') {
			minx = 0;
			miny = 0;
			maxx = svgroot.getAttribute('width');
			maxy = svgroot.getAttribute('height');
		}

		var dx = new Array(len);
		var dy = new Array(len);
		for (var i = 0; i < len; ++i) {
			if (selectedElements[i] == null) break;
			var elem = selectedElements[i];
			var bbox = bboxes[i];
			dx[i] = 0;
			dy[i] = 0;
			switch (type) {
				case 'l': // left (horizontal)
					dx[i] = minx - bbox.x;
					break;
				case 'c': // center (horizontal)
					dx[i] = (minx+maxx)/2 - (bbox.x + bbox.width/2);
					break;
				case 'r': // right (horizontal)
					dx[i] = maxx - (bbox.x + bbox.width);
					break;
				case 't': // top (vertical)
					dy[i] = miny - bbox.y;
					break;
				case 'm': // middle (vertical)
					dy[i] = (miny+maxy)/2 - (bbox.y + bbox.height/2);
					break;
				case 'b': // bottom (vertical)
					dy[i] = maxy - (bbox.y + bbox.height);
					break;
			}
		}
		this.moveSelectedElements(dx,dy);
	};
	this.getZoom = function(){return current_zoom;};
	
	// Function: getVersion
	// Returns a string which describes the revision number of SvgCanvas.
	this.getVersion = function() {
		return "svgcanvas.js ($Rev$)";
	};
	
	this.clear();
};

// Static class for various utility functions

var Utils = {

// This code was written by Tyler Akins and has been placed in the
// public domain.  It would be nice if you left this header intact.
// Base64 code from Tyler Akins -- http://rumkin.com

// schiller: Removed string concatenation in favour of Array.join() optimization,
//           also precalculate the size of the array needed.

	"_keyStr" : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

	"encode64" : function(input) {
		// base64 strings are 4/3 larger than the original string
//		input = Utils.encodeUTF8(input); // convert non-ASCII characters
		input = Utils.convertToXMLReferences(input);
		if(window.btoa) return window.btoa(input); // Use native if available
		var output = new Array( Math.floor( (input.length + 2) / 3 ) * 4 );
		var chr1, chr2, chr3;
		var enc1, enc2, enc3, enc4;
		var i = 0, p = 0;

		do {
			chr1 = input.charCodeAt(i++);
			chr2 = input.charCodeAt(i++);
			chr3 = input.charCodeAt(i++);

			enc1 = chr1 >> 2;
			enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
			enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
			enc4 = chr3 & 63;

			if (isNaN(chr2)) {
				enc3 = enc4 = 64;
			} else if (isNaN(chr3)) {
				enc4 = 64;
			}

			output[p++] = this._keyStr.charAt(enc1);
			output[p++] = this._keyStr.charAt(enc2);
			output[p++] = this._keyStr.charAt(enc3);
			output[p++] = this._keyStr.charAt(enc4);
		} while (i < input.length);

		return output.join('');
	},
	
	"decode64" : function(input) {
		if(window.atob) return window.atob(input);
		var output = "";
		var chr1, chr2, chr3 = "";
		var enc1, enc2, enc3, enc4 = "";
		var i = 0;
	
		 // remove all characters that are not A-Z, a-z, 0-9, +, /, or =
		 input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
	
		 do {
			enc1 = this._keyStr.indexOf(input.charAt(i++));
			enc2 = this._keyStr.indexOf(input.charAt(i++));
			enc3 = this._keyStr.indexOf(input.charAt(i++));
			enc4 = this._keyStr.indexOf(input.charAt(i++));
	
			chr1 = (enc1 << 2) | (enc2 >> 4);
			chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
			chr3 = ((enc3 & 3) << 6) | enc4;
	
			output = output + String.fromCharCode(chr1);
	
			if (enc3 != 64) {
			   output = output + String.fromCharCode(chr2);
			}
			if (enc4 != 64) {
			   output = output + String.fromCharCode(chr3);
			}
	
			chr1 = chr2 = chr3 = "";
			enc1 = enc2 = enc3 = enc4 = "";
	
		 } while (i < input.length);
		 return unescape(output);
	},
	
	// based on http://phpjs.org/functions/utf8_encode:577
	// codedread:does not seem to work with webkit-based browsers on OSX
	"encodeUTF8": function(input) {
		//return unescape(encodeURIComponent(input)); //may or may not work
		var output = '';
		for (var n = 0; n < input.length; n++){
			var c = input.charCodeAt(n);
			if (c < 128) {
				output += input[n];
			}
			else if (c > 127) {
				if (c < 2048){
					output += String.fromCharCode((c >> 6) | 192);
				} 
				else {
					output += String.fromCharCode((c >> 12) | 224) + String.fromCharCode((c >> 6) & 63 | 128);
				}
				output += String.fromCharCode((c & 63) | 128);
			}
		}
		return output;
	},
	
	"convertToXMLReferences": function(input) {
		var output = '';
		for (var n = 0; n < input.length; n++){
			var c = input.charCodeAt(n);
			if (c < 128) {
				output += input[n];
			}
			else if(c > 127) {
				output += ("&#" + c + ";");
			}
		}
		return output;
	},

	"rectsIntersect": function(r1, r2) {
		return r2.x < (r1.x+r1.width) && 
			(r2.x+r2.width) > r1.x &&
			r2.y < (r1.y+r1.height) &&
			(r2.y+r2.height) > r1.y;
	},

	// found this function http://groups.google.com/group/jquery-dev/browse_thread/thread/c6d11387c580a77f
	"text2xml": function(sXML) {
		// NOTE: I'd like to use jQuery for this, but jQuery makes all tags uppercase
		//return $(xml)[0];
		var out;
		try{
			var dXML = ($.browser.msie)?new ActiveXObject("Microsoft.XMLDOM"):new DOMParser();
			dXML.async = false;
		} catch(e){ 
			throw new Error("XML Parser could not be instantiated"); 
		};
		try{
			if($.browser.msie) out = (dXML.loadXML(sXML))?dXML:false;
			else out = dXML.parseFromString(sXML, "text/xml");
		}
		catch(e){ throw new Error("Error parsing XML string"); };
		return out;
	}
};