svgedit/docs/SvgCanvas.md

SvgCanvas

The main SvgCanvas class that manages all SVG-related functions

Parameters

• container The container HTML element that should hold the SVG root element
• config An object that contains configuration data

Summary

SvgCanvas - The main SvgCanvas class that manages all SVG-related functions

Function	Description
Utils.toXml	Converts characters in a string to XML-friendly entities.
Utils.fromXml	Converts XML entities in a string to single characters.
Utils.encode64	Converts a string to base64
Utils.decode64	Converts a string from base64
Utils.convertToXMLReferences	Converts a string to use XML references
rectsIntersect	Check if two rectangles (BBoxes objects) intersect each other
snapToAngle	Returns a 45 degree angle coordinate associated with the two given coordinates
text2xml	Cross-browser compatible method of converting a string to an XML tree found this function here

Unit conversion functions

Function	Descrption
convertToNum	Converts given values to numbers.
setUnitAttr	Sets an element’s attribute based on the unit in its current value.
isValidUnit	Check if an attribute’s value is in a valid format

Undo/Redo history management

Function	Description
ChangeElementCommand	History command to make a change to an element.
ChangeElementCommand.apply	Performs the stored change action
ChangeElementCommand.unapply	Reverses the stored change action
ChangeElementCommand.elements	Returns array with element associated with this command
InsertElementCommand	History command for an element that was added to the DOM
InsertElementCommand.apply	Re-Inserts the new element
InsertElementCommand.unapply	Removes the element
InsertElementCommand.elements	Returns array with element associated with this command
RemoveElementCommand	History command for an element removed from the DOM
RemoveElementCommand.apply	Re-removes the new element
RemoveElementCommand.unapply	Re-adds the new element
RemoveElementCommand.elements	Returns array with element associated with this command
MoveElementCommand	History command for an element that had its DOM position changed
MoveElementCommand.unapply	Re-positions the element
MoveElementCommand.unapply	Positions the element back to its original location
MoveElementCommand.elements	Returns array with element associated with this command
BatchCommand	History command that can contain/execute multiple other commands
BatchCommand.apply	Runs "apply" on all subcommands
BatchCommand.unapply	Runs "unapply" on all subcommands
BatchCommand.elements	Iterate through all our subcommands and returns all the elements we are changing
BatchCommand.addSubCommand	Adds a given command to the history stack
BatchCommand.isEmpty	Returns a boolean indicating whether or not the batch command is empty
resetUndoStack	Resets the undo stack, effectively clearing the undo/redo history
undoMgr.getUndoStackSize	Integer with the current size of the undo history stack
undoMgr.getRedoStackSize	Integer with the current size of the redo history stack
undoMgr.getNextUndoCommandText	String associated with the next undo command
undoMgr.getNextRedoCommandText	String associated with the next redo command
undoMgr.undo	Performs an undo step
undoMgr.redo	Performs a redo step
addCommandToHistory	Adds a command object to the undo history stack
beginUndoableChange	This function tells the canvas to remember the old values of the attrName attribute for each element sent in.
finishUndoableChange	This function returns a BatchCommand object which summarizes the change since beginUndoableChange was called.

Selector - Private class for DOM element selection boxes

Function	Description
Selector.reset	Used to reset the id and element that the selector is attached to
Selector.showGrips	Show the resize grips of this selector
Selector.updateGripCursors	Updates cursors for corner grips on rotation so arrows point the right way
Selector.resize	Updates the selector to match the element’s size

SelectorManager - Public class to manage all selector objects (selection boxes)

Function	Description
SelectorManager.initGroup	Resets the parent selector group element
SelectorManager.requestSelector	Returns the selector based on the given element
SelectorManager.releaseSelector	Removes the selector of the given element (hides selection box)
SelectorManager.getRubberBandBox	Returns the rubberBandBox DOM element.

Helper functions

Function	Description
walkTree	Walks the tree and executes the callback on each element in a top-down fashion
walkTreePost	Walks the tree and executes the callback on each element in a depth-first fashion
assignAttributes	Assigns multiple attributes to an element.
cleanupElement	Remove unneeded (default) attributes, makes resulting SVG smaller
addSvgElementFromJson	Create a new SVG element based on the given object keys/values and add it to the current layer The element will be ran through cleanupElement before being returned
addExtension	Add an extension to the editor
shortFloat	Rounds a given value to a float with number of digits defined in save_options
getStrokedBBox	Get the bounding box for one or more stroked and/or transformed elements
getVisibleElements	Get all elements that have a BBox (excludes <defs>, <title>, etc).
copyElem	Create a clone of an element, updating its ID and its children’s IDs when needed
getElem	Get a DOM element by ID within the SVG root element.
getId	Returns the last created DOM element ID string
getNextId	Creates and returns a unique ID string for a DOM element
bind	Attaches a callback function to an event
setIdPrefix	Changes the ID prefix to the given value
sanitizeSvg	Sanitizes the input node and its children It only keeps what is allowed from our whitelist defined above
getUrlFromAttr	Extracts the URL from the url(...)
getBBox	Get the given/selected element’s bounding box object, convert it to be more usable when necessary
ffClone	Hack for Firefox bugs where text element features aren't updated.
getPathBBox	Get correct BBox for a path in Webkit Converted from code found here

Element Transforms

Function	Description
getRotationAngle	Get the rotation angle of the given/selected DOM element
setRotationAngle	Removes any old rotations if present, prepends a new rotation at the transformed center
getTransformList	Returns an object that behaves like a SVGTransformList for the given DOM element
recalculateAllSelectedDimensions	Runs recalculateDimensions on the selected elements, adding the changes to a single batch command
remapElement	Applies coordinate changes to an element based on the given matrix
recalculateDimensions	Decides the course of action based on the element’s transform list
transformPoint	A (hopefully) quicker function to transform a point by a matrix (this function avoids any DOM calls and just does the math)
isIdentity	Helper function to check if the matrix performs no actual transform (i.e.
matrixMultiply	This function tries to return a SVGMatrix that is the multiplication m1*m2.
transformListToTransform	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
hasMatrixTransform	See if the given transformlist includes a non-indentity matrix transform
getMatrix	Get the matrix object for a given element
transformBox	Transforms a rectangle based on the given matrix

Selection

Function	Description
clearSelection	Clears the selection.
addToSelection	Adds a list of elements to the selection.
removeFromSelection	Removes elements from the selection.
selectAllInCurrentLayer	Clears the selection, then adds all elements in the current layer to the selection.
smoothControlPoints	Takes three points and creates a smoother line based on them
getMouseTarget	Gets the desired element from a mouse event
preventClickDefault	Prevents default browser click behaviour on the given element

Text edit functions - Functions relating to editing text elements

Path edit functions - Functions relating to editing path elements

Serialization

Function	Description
removeUnusedDefElems	Looks at DOM elements inside the to see if they are referred to, removes them from the DOM if they are not.
svgCanvasToString	Main function to set up the SVG content for output
svgToString	Sub function ran on each SVG element to convert it to a string as desired
embedImage	Converts a given image file to a data URL when possible, then runs a given callback
save	Serializes the current drawing into SVG XML text and returns it to the ‘saved’ handler.
rasterExport	Generates a PNG Data URL based on the current image, then calls “exported” with an object including the string and any issues found
getSvgString	Returns the current drawing as raw SVG XML text.
setSvgString	This function sets the current drawing as the input SVG XML.
importSvgString	This function imports the input SVG XML into the current layer in the drawing

Layers

Function	Description
identifyLayers	Updates layer system
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.
deleteCurrentLayer	Deletes the current layer from the drawing and then clears the selection.
getNumLayers	Returns the number of layers in the current drawing.
getLayer	Returns the name of the ith layer.
getCurrentLayer	Returns the name of the currently selected layer.
setCurrentLayer	Sets the current layer.
renameCurrentLayer	Renames the current layer.
setCurrentLayerPosition	Changes the position of the current layer to the new value.
getLayerVisibility	Returns whether the layer is visible.
setLayerVisibility	Sets the visibility of the layer.
moveSelectedToLayer	Moves the selected elements to layername.
getLayerOpacity	Returns the opacity of the given layer.
setLayerOpacity	Sets the opacity of the given layer.

Document functions

Function	Description
clear	Clears the current document.
linkControlPoints	Alias function
getContentElem	Returns the content DOM element
getRootElem	Returns the root DOM element
getSelectedElems	Returns the array with selected DOM elements
getResolution	Returns the current dimensions and zoom level in an object
getZoom	Returns the current zoom level
getVersion	Returns a string which describes the revision number of SvgCanvas.
setUiStrings	Update interface strings with given values
setConfig	Update configuration options with given values
getDocumentTitle	Returns the current document title or an empty string if not found
setDocumentTitle	Adds/updates a title element for the document with the given name.
getEditorNS	Returns the editor’s namespace URL, optionally adds it to root element
setResolution	Changes the document’s dimensions to the given size
getOffset	Returns an object with x, y values indicating the svgcontent element’s position in the editor’s canvas.
setBBoxZoom	Sets the zoom level on the canvas-side based on the given value
setZoom	Sets the zoom to the given level
getMode	Returns the current editor mode string
setMode	Sets the editor’s mode to the given string

Element Styling

Function	Description
getColor	Returns the current fill/stroke option
setColor	Change the current stroke/fill color/gradient value
findDefs	Return the document’s <defs> element, create it first if necessary
setGradient	Apply the current gradient to selected element’s fill or stroke
findDuplicateGradient	Check if exact gradient already exists
setPaint	Set a color/gradient to a fill/stroke
getStrokeWidth	Returns the current stroke-width value
setStrokeWidth	Sets the stroke width for the current selected elements When attempting to set a line’s width to 0, this changes it to 1 instead
setStrokeAttr	Set the given stroke-related attribute the given value for selected elements
getOpacity	Returns the current opacity
setOpacity	Sets the given opacity to the current selected elements
getOpacity	Returns the current fill opacity
getStrokeOpacity	Returns the current stroke opacity
setPaintOpacity	Sets the current fill/stroke opacity
getBlur	Gets the stdDeviation blur value of the given element
setBlurNoUndo	Sets the stdDeviation blur value on the selected element without being undoable
setBlurOffsets	Sets the x, y, with, height values of the filter element in order to make the blur not be clipped.
setBlur	Adds/updates the blur filter to the selected element
getBold	Check whether selected element is bold or not
setBold	Make the selected element bold or normal
getItalic	Check whether selected element is italic or not
setItalic	Make the selected element italic or normal
getFontFamily	Returns the current font family
setFontFamily	Set the new font family
getFontSize	Returns the current font size
setFontSize	Applies the given font size to the selected element
getText	Returns the current text (textContent) of the selected element
setTextContent	Updates the text element with the given string
setImageURL	Sets the new image URL for the selected image element.
setRectRadius	Sets the rx & ry values to the selected rect element to change its corner radius

Element manipulation

Function	Description
setSegType	Sets the new segment type to the selected segment(s).
convertToPath	Convert selected element to a path, or get the BBox of an element-as-path
changeSelectedAttributeNoUndo	This function makes the changes to the elements.
changeSelectedAttribute	Change the given/selected element and add the original value to the history stack If you want to change all selectedElements, ignore the elems argument.
deleteSelectedElements	Removes all selected elements from the DOM and adds the change to the history stack
groupSelectedElements	Wraps all the selected elements in a group (g) element
ungroupSelectedElement	Unwraps all the elements in a selected group (g) element.
moveToTopSelectedElement	Repositions the selected element to the bottom in the DOM to appear on top of other elements
moveToBottomSelectedElement	Repositions the selected element to the top in the DOM to appear under other elements
moveSelectedElements	Moves selected elements on the X/Y axis
cloneSelectedElements	Create deep DOM copies (clones) of all selected elements and move them slightly from their originals
alignSelectedElements	Aligns selected elements

Additional editor tools

Function	Description
updateCanvas	Updates the editor canvas width/height/position after a zoom has occurred
setBackground	Set the background of the editor (NOT the actual document)
cycleElement	Select the next/previous element within the current layer

Utils.toXml

Converts characters in a string to XML-friendly entities. Example: & becomes &

Parameters

str The string to be converted

Returns

The converted string

Utils.fromXml

Converts XML entities in a string to single characters. Example: & becomes &

Parameters

str The string to be converted

Returns

The converted string

Utils.encode64

Converts a string to base64

Utils.decode64

Converts a string from base64

Utils.convertToXMLReferences

Converts a string to use XML references

rectsIntersect

"rectsIntersect": function( r1,r2 )

Check if two rectangles (BBoxes objects) intersect each other

Paramaters

r1 The first BBox-like object r2 The second BBox-like object

Returns

Boolean that’s true if rectangles intersect

snapToAngle

"snapToAngle": function( x1, y1, x2, y2 )

Returns a 45 degree angle coordinate associated with the two given coordinates

Parameters

• x1 First coordinate’s x value
• x2 Second coordinate’s x value
• y1 First coordinate’s y value
• y2 Second coordinate’s y value

Returns

Object with the following values: x - The angle-snapped x value y - The angle-snapped y value snapangle - The angle at which to snap

text2xml

"text2xml": function(sXML)

Cross-browser compatible method of converting a string to an XML tree found this function here

Unit conversion functions

convertToNum

convertToNum = function( attr, val )

Converts given values to numbers. Attributes must be supplied in case a percentage is given

Parameters

• attr String with the name of the attribute associated with the value
• val String with the attribute value to convert

setUnitAttr

setUnitAttr = function( elem, attr, val )

Sets an element’s attribute based on the unit in its current value.

Parameters

• elem DOM element to be changed
• attr String with the name of the attribute associated with the value
• val String with the attribute value to convert

isValidUnit

canvas.isValidUnit = function( attr,val )

Check if an attribute’s value is in a valid format

Parameters

• attr String with the name of the attribute associated with the value
• val String with the attribute value to check

Undo/Redo history management

ChangeElementCommand

var ChangeElementCommand = this.undoCmd.changeElement = function( elem, attrs, text )

History command to make a change to an element. Usually an attribute change, but can also be textcontent.

Parameters

• elem The DOM element that was changed
• attrs An object with the attributes to be changed and the values they had before the change
• text An optional string visible to user related to this change

ChangeElementCommand.apply

Performs the stored change action

ChangeElementCommand.unapply

Reverses the stored change action

ChangeElementCommand.elements

Returns array with element associated with this command

InsertElementCommand

var InsertElementCommand = this.undoCmd.insertElement = function( elem, text )

History command for an element that was added to the DOM

Parameters

• elem The newly added DOM element
• text An optional string visible to user related to this change

InsertElementCommand.apply

Re-Inserts the new element

InsertElementCommand.unapply

Removes the element

InsertElementCommand.elements

Returns array with element associated with this command

RemoveElementCommand

var RemoveElementCommand = this.undoCmd.removeElement = function( elem, parent, text )

History command for an element removed from the DOM

Parameters

• elem The removed DOM element
• parent The DOM element’s parent
• text An optional string visible to user related to this change

RemoveElementCommand.apply

Re-removes the new element

RemoveElementCommand.unapply

Re-adds the new element

RemoveElementCommand.elements

Returns array with element associated with this command

MoveElementCommand

var MoveElementCommand = this.undoCmd.moveElement = function( elem, oldNextSibling, oldParent, text )

History command for an element that had its DOM position changed

Parameters

• elem The DOM element that was moved
• oldNextSibling The element’s next sibling before it was moved
• oldParent The element’s parent before it was moved
• text An optional string visible to user related to this change

MoveElementCommand.unapply

Re-positions the element

MoveElementCommand.unapply

Positions the element back to its original location

MoveElementCommand.elements

Returns array with element associated with this command

BatchCommand

var BatchCommand = this.undoCmd.batch = function( text )

History command that can contain/execute multiple other commands

Parameters

• text An optional string visible to user related to this change

BatchCommand.apply

Runs “apply” on all subcommands

BatchCommand.unapply

Runs “unapply” on all subcommands

BatchCommand.elements

Iterate through all our subcommands and returns all the elements we are changing

BatchCommand.addSubCommand

Adds a given command to the history stack

Parameters

• cmd The undo command object to add

BatchCommand.isEmpty

Returns a boolean indicating whether or not the batch command is empty

resetUndoStack

resetUndoStack = function()

Resets the undo stack, effectively clearing the undo/redo history

undoMgr.getUndoStackSize

Returns

Integer with the current size of the undo history stack

undoMgr.getRedoStackSize

Returns

Integer with the current size of the redo history stack

undoMgr.getNextUndoCommandText

Returns

String associated with the next undo command

undoMgr.getNextRedoCommandText

Returns

String associated with the next redo command

undoMgr.undo

Performs an undo step

undoMgr.redo

Performs a redo step

addCommandToHistory

addCommandToHistory = c.undoCmd.add = function( cmd )

Adds a command object to the undo history stack

Parameters

• cmd The command object to add

beginUndoableChange

c.beginUndoableChange = function( attrName, elems )

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.

Parameters

• attrName The name of the attribute being changed
• elems Array of DOM elements being changed

finishUndoableChange

c.finishUndoableChange = function()

This function returns a BatchCommand object which summarizes the change since beginUndoableChange was called. The command can then be added to the command history

Returns

Batch command object with resulting changes

Selector

Private class for DOM element selection boxes

Parameters

• id integer to internally indentify the selector
• elem DOM element associated with this selector

Summary

Function	Description
Selector.reset	Used to reset the id and element that the selector is attached to
Selector.showGrips	Show the resize grips of this selector
Selector.updateGripCursors	Updates cursors for corner grips on rotation so arrows point the right way
Selector.resize	Updates the selector to match the element’s size

Functions

Selector.reset

Used to reset the id and element that the selector is attached to

Parameters

• e DOM element associated with this selector

Selector.showGrips

Show the resize grips of this selector

Parameters

• show boolean indicating whether grips should be shown or not

Selector.updateGripCursors

Updates cursors for corner grips on rotation so arrows point the right way

Parameters

• angle Float indicating current rotation angle in degrees

Selector.resize

Updates the selector to match the element’s size

SelectorManager

Public class to manage all selector objects (selection boxes)

Summary

Function	Description
SelectorManager.initGroup	Resets the parent selector group element
SelectorManager.requestSelector	Returns the selector based on the given element
SelectorManager.releaseSelector	Removes the selector of the given element (hides selection box)
SelectorManager.getRubberBandBox	Returns the rubberBandBox DOM element.

SelectorManager.initGroup

Resets the parent selector group element

SelectorManager.requestSelector

Returns the selector based on the given element

Parameters

• elem DOM element to get the selector for

SelectorManager.releaseSelector

Removes the selector of the given element (hides selection box)

Parameters

• elem DOM element to remove the selector for

SelectorManager.getRubberBandBox

Returns the rubberBandBox DOM element. This is the rectangle drawn by the user for selecting/zooming

Helper functions

walkTree

function walkTree( elem, cbFn )

Walks the tree and executes the callback on each element in a top-down fashion

Parameters

• elem DOM element to traverse
• cbFn Callback function to run on each element

walkTreePost

function walkTreePost( elem, cbFn )

Walks the tree and executes the callback on each element in a depth-first fashion

Parameters

• elem DOM element to traverse
• cbFn Callback function to run on each element

assignAttributes

var assignAttributes = this.assignAttributes = function( node, attrs, suspendLength, unitCheck )

Assigns multiple attributes to an element.

Parameters

• node DOM element to apply new attribute values to
• attrs Object with attribute keys/values
• suspendLength Optional integer of milliseconds to suspend redraw
• unitCheck Boolean to indicate the need to use setUnitAttr

cleanupElement

var cleanupElement = this.cleanupElement = function( element )

Remove unneeded (default) attributes, makes resulting SVG smaller

Parameters

• element DOM element to clean up

addSvgElementFromJson

var addSvgElementFromJson = this.addSvgElementFromJson = function( data )

Create a new SVG element based on the given object keys/values and add it to the current layer The element will be ran through cleanupElement before being returned

Parameters

• data Object with the following keys/values:
  • element - DOM element to create
  • attr - Object with attributes/values to assign to the new element
  • curStyles - Boolean indicating that current style attributes should be applied first

Returns

The new element

addExtension

this.addExtension = function( name, ext_func )

Add an extension to the editor

Parameters

• name String with the ID of the extension
• ext_func Function supplied by the extension with its data

shortFloat

var shortFloat = function( val )

Rounds a given value to a float with number of digits defined in save_options

Parameters

• val The value as a String, Number or Array of two numbers to be rounded

Returns

If a string/number was given, returns a Float. If an array, return a string with comma-separated floats

getStrokedBBox

var getStrokedBBox = this.getStrokedBBox = function( elems )

Get the bounding box for one or more stroked and/or transformed elements

Parameters

• elems Array with DOM elements to check

Returns

A single bounding box object

getVisibleElements

var getVisibleElements = this.getVisibleElements = function( parent, includeBBox )

Get all elements that have a BBox (excludes <defs>, <title>, etc). Note that 0-opacity, off-screen etc elements are still considered “visible” for this function

Parameters

• parent The parent DOM element to search within
• includeBBox Boolean to indicate that an object should return with the element and its bbox

Returns

An array with all “visible” elements, or if includeBBox is true, an array with objects that include:

• elem - The element
• bbox - The element’s BBox as retrieved from getStrokedBBox

copyElem

var copyElem = function( el )

Create a clone of an element, updating its ID and its children’s IDs when needed

Parameters

• el DOM element to clone

Returns

The cloned element

getElem

function getElem( id )

Get a DOM element by ID within the SVG root element.

Parameters

• id String with the element’s new ID

getId

getId = c.getId = function()

Returns the last created DOM element ID string

getNextId

getNextId = c.getNextId = function()

Creates and returns a unique ID string for a DOM element

bind

c.bind = function( event, f )

Attaches a callback function to an event

Parameters

• event String indicating the name of the event
• f The callback function to bind to the event

Returns

The previous event

setIdPrefix

c.setIdPrefix = function( p )

Changes the ID prefix to the given value

Parameters

• p String with the new prefix

sanitizeSvg

var sanitizeSvg = this.sanitizeSvg = function( node )

Sanitizes the input node and its children It only keeps what is allowed from our whitelist defined above

Parameters

• node The DOM element to be checked, will also check its children

getUrlFromAttr

var getUrlFromAttr = this.getUrlFromAttr = function( attrVal )

Extracts the URL from the url(...) syntax of some attributes. Three variants:

• <circle fill="url(someFile.svg#foo)" />
• <circle fill="url(‘someFile.svg#foo’)" />
• <circle fill=’url("someFile.svg#foo")’ />

Parameters

• attrVal The attribute value as a string

Returns

String with just the URL, like someFile.svg#foo

getBBox

var getBBox = this.getBBox = function( elem )

Get the given/selected element’s bounding box object, convert it to be more usable when necessary

Parameters

• elem Optional DOM element to get the BBox for

ffClone

var ffClone = function( elem )

Hack for Firefox bugs where text element features aren’t updated. This function clones the element and re-selects it

TODO: Test for this bug on load and add it to “support” object instead of browser sniffing

Parameters

• elem The (text) DOM element to clone

getPathBBox

var getPathBBox = function( path )

Get correct BBox for a path in Webkit Converted from code found here

Parameters

• path The path DOM element to get the BBox for

Returns

A BBox-like object

Element Transforms

getRotationAngle

var getRotationAngle = this.getRotationAngle = function( elem, to_rad )

Get the rotation angle of the given/selected DOM element

Parameters

• elem Optional DOM element to get the angle for
• to_rad Boolean that when true returns the value in radians rather than degrees

Returns

Float with the angle in degrees or radians

setRotationAngle

this.setRotationAngle = function( val, preventUndo )

Removes any old rotations if present, prepends a new rotation at the transformed center

Parameters

• val The new rotation angle in degrees
• preventUndo Boolean indicating whether the action should be undoable or not

getTransformList

var getTransformList = this.getTransformList = function( elem )

Returns an object that behaves like a SVGTransformList for the given DOM element

Parameters

• elem DOM element to get a transformlist from

recalculateAllSelectedDimensions

var recalculateAllSelectedDimensions = this.recalculateAllSelectedDimensions = function()

Runs recalculateDimensions on the selected elements, adding the changes to a single batch command

remapElement

var remapElement = this.remapElement = function( selected, changes, m )

Applies coordinate changes to an element based on the given matrix

Parameters

• selected DOM element to be changed
• changes Object with changes to be remapped
• m Matrix object to use for remapping coordinates

recalculateDimensions

var recalculateDimensions = this.recalculateDimensions = function( selected )

Decides the course of action based on the element’s transform list

Parameters

• selected The DOM element to recalculate

Returns

Undo command object with the resulting change

transformPoint

var transformPoint = function( x, y, m )

A (hopefully) quicker function to transform a point by a matrix (this function avoids any DOM calls and just does the math)

Parameters

• x Float representing the x coordinate
• y Float representing the y coordinate
• m Matrix object to transform the point with Returns a x,y object representing the transformed point

isIdentity

var isIdentity = function( m )

Helper function to check if the matrix performs no actual transform (i.e. exists for identity purposes)

Parameters

• m The matrix object to check

Returns

Boolean indicating whether or not the matrix is 1,0,0,1,0,0

matrixMultiply

var matrixMultiply = this.matrixMultiply = function()

This function tries to return a SVGMatrix that is the multiplication m1*m2. We also round to zero when it’s near zero

Parameters

= 2 Matrix objects to multiply

Returns

The matrix object resulting from the calculation

transformListToTransform

var transformListToTransform = this.transformListToTransform = function( tlist, min, max )

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

Parameters

• tlist The transformlist object
• min Optional integer indicating start transform position
• max Optional integer indicating end transform position

Returns

A single matrix transform object

hasMatrixTransform

var hasMatrixTransform = this.hasMatrixTransform = function( tlist )

See if the given transformlist includes a non-indentity matrix transform

Parameters

• tlist The transformlist to check

Returns

Boolean on whether or not a matrix transform was found

getMatrix

var getMatrix = function( elem )

Get the matrix object for a given element

Parameters

• elem The DOM element to check

Returns

The matrix object associated with the element’s transformlist

transformBox

var transformBox = this.transformBox = function( l, t, w, h, m )

Transforms a rectangle based on the given matrix

Parameters

• l Float with the box’s left coordinate
• t Float with the box’s top coordinate
• w Float with the box width
• h Float with the box height
• m Matrix object to transform the box by

Returns

An object with the following values:

• tl - The top left coordinate (x,y object)
• tr - The top right coordinate (x,y object)
• bl - The bottom left coordinate (x,y object)
• br - The bottom right coordinate (x,y object)
• aabox - Object with the following values:
• Float with the axis-aligned x coordinate
• Float with the axis-aligned y coordinate
• Float with the axis-aligned width coordinate
• Float with the axis-aligned height coordinate

Selection

clearSelection

var clearSelection = this.clearSelection = function( noCall )

Clears the selection. The selected handler is then called. Parameters: noCall - Optional boolean that when true does not call the “selected” handler

addToSelection

var addToSelection = this.addToSelection = function( elemsToAdd, showGrips )

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

removeFromSelection

var removeFromSelection = this.removeFromSelection = function( elemsToRemove )

Removes elements from the selection.

Parameters

• elemsToRemove an array of elements to remove from selection

selectAllInCurrentLayer

this.selectAllInCurrentLayer = function()

Clears the selection, then adds all elements in the current layer to the selection. This function then fires the selected event.

smoothControlPoints

var smoothControlPoints = this.smoothControlPoints = function( ct1, ct2, pt )

Takes three points and creates a smoother line based on them

Parameters

• ct1 Object with x and y values (first control point)
• ct2 Object with x and y values (second control point)
• pt Object with x and y values (third point)

Returns

Array of two “smoothed” point objects

getMouseTarget

var getMouseTarget = this.getMouseTarget = function( evt )

Gets the desired element from a mouse event

Parameters

• evt Event object from the mouse event

Returns

DOM element we want

preventClickDefault

var preventClickDefault = function( img )

Prevents default browser click behaviour on the given element

Parameters

• img The DOM element to prevent the cilck on

Text edit functions

Functions relating to editing text elements

Path edit functions

Functions relating to editing path elements

Serialization

removeUnusedDefElems

var removeUnusedDefElems = this.removeUnusedDefElems = function()

Looks at DOM elements inside the to see if they are referred to, removes them from the DOM if they are not.

Returns

The amount of elements that were removed

svgCanvasToString

var svgCanvasToString = this.svgCanvasToString = function()

Main function to set up the SVG content for output

Returns

String containing the SVG image for output

svgToString

var svgToString = this.svgToString = function( elem, indent )

Sub function ran on each SVG element to convert it to a string as desired

Parameters

• elem The SVG element to convert
• indent Integer with the amount of spaces to indent this tag

Returns

String with the given element as an SVG tag

embedImage

this.embedImage = function( val, callback )

Converts a given image file to a data URL when possible, then runs a given callback

Parameters

• val String with the path/URL of the image
• callback Optional function to run when image data is found, supplies the result (data URL or false) as first parameter.

save

this.save = function( opts )

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

rasterExport

this.rasterExport = function()

Generates a PNG Data URL based on the current image, then calls “exported” with an object including the string and any issues found

getSvgString

this.getSvgString = function()

Returns the current drawing as raw SVG XML text.

Returns

The current drawing as raw SVG XML text.

setSvgString

this.setSvgString = function( xmlString )

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.

importSvgString

this.importSvgString = function( xmlString )

This function imports the input SVG XML into the current layer in the drawing

Parameters

• xmlString The SVG as XML text.

Returns

This function returns false if the import was unsuccessful, true otherwise.

TODO:

• properly handle if namespace is introduced by imported content (must add to svgcontent and update all prefixes in the imported node)
• properly handle recalculating dimensions, recalculateDimensions() doesn’t handle arbitrary transform lists, but makes some assumptions about how the transform list was obtained
• import should happen in top-left of current zoomed viewport
• create a new layer for the imported SVG

Layers

identifyLayers

var identifyLayers = function()

Updates layer system

createLayer

this.createLayer = function( name )

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

deleteCurrentLayer

this.deleteCurrentLayer = function()

Deletes the current layer from the drawing and then clears the selection. This function then calls the ‘changed’ handler. This is an undoable action.

getNumLayers

this.getNumLayers = function()

Returns the number of layers in the current drawing.

Returns

The number of layers in the current drawing.

getLayer

this.getLayer = function( i )

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

getCurrentLayer

this.getCurrentLayer = function()

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.

setCurrentLayer

this.setCurrentLayer = function( name )

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

renameCurrentLayer

this.renameCurrentLayer = function( newname )

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.

setCurrentLayerPosition

this.setCurrentLayerPosition = function( newpos )

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.

getLayerVisibility

this.getLayerVisibility = function(	 layername )

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.

setLayerVisibility

this.setLayerVisibility = function( layername, bVisible )

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

moveSelectedToLayer

this.moveSelectedToLayer = function( layername )

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.

getLayerOpacity

this.getLayerOpacity = function( layername )

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

setLayerOpacity

this.setLayerOpacity = function( layername, opacity )

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

Document functions

clear

this.clear = function()

Clears the current document. This is not an undoable action.

linkControlPoints

Alias function

getContentElem

this.getContentElem = function()

Returns the content DOM element

getRootElem

this.getRootElem = function()

Returns the root DOM element

getSelectedElems

this.getSelectedElems = function()

Returns the array with selected DOM elements

getResolution

var getResolution = this.getResolution = function()

Returns the current dimensions and zoom level in an object

getZoom

this.getZoom = function()

Returns the current zoom level

getVersion

this.getVersion = function()

Returns a string which describes the revision number of SvgCanvas.

setUiStrings

this.setUiStrings = function(strs)

Update interface strings with given values

Parameters

• strs Object with strings (see uiStrings for examples)

setConfig

this.setConfig = function( opts )

Update configuration options with given values

Parameters

• opts Object with options (see curConfig for examples)

getDocumentTitle

this.getDocumentTitle = function()

Returns the current document title or an empty string if not found

setDocumentTitle

this.setDocumentTitle = function( newtitle )

Adds/updates a title element for the document with the given name. This is an undoable action

Parameters

• newtitle String with the new title

getEditorNS

this.getEditorNS = function( add )

Returns the editor’s namespace URL, optionally adds it to root element

Parameters

• add Boolean to indicate whether or not to add the namespace value

setResolution

this.setResolution = function( x, y )

Changes the document’s dimensions to the given size

Parameters

• x Number with the width of the new dimensions in user units. Can also be the string “fit” to indicate “fit to content”
• y Number with the height of the new dimensions in user units.

Returns

Boolean to indicate if resolution change was succesful. It will fail on “fit to content” option with no content to fit to.

getOffset

this.getOffset = function()

Returns an object with x, y values indicating the svgcontent element’s position in the editor’s canvas.

setBBoxZoom

this.setBBoxZoom = function( val, editor_w, editor_h )

Sets the zoom level on the canvas-side based on the given value

Parameters

• val Bounding box object to zoom to or string indicating zoom option
• editor_w Integer with the editor’s workarea box’s width
• editor_h Integer with the editor’s workarea box’s height

setZoom

this.setZoom = function( zoomlevel )

Sets the zoom to the given level

Parameters

• zoomlevel Float indicating the zoom level to change to

getMode

this.getMode = function()

Returns the current editor mode string

setMode

this.setMode = function( name )

Sets the editor’s mode to the given string

Parameters

• name String with the new mode to change to

Element Styling

getColor

this.getColor = function( type )

Returns the current fill/stroke option

setColor

this.setColor = function( type, val, preventUndo )

Change the current stroke/fill color/gradient value

Parameters

• type String indicating fill or stroke
• val The value to set the stroke attribute to
• preventUndo Boolean indicating whether or not this should be and undoable option

findDefs

var findDefs = function()

Return the document’s <defs> element, create it first if necessary

setGradient

var setGradient = this.setGradient = function( type )

Apply the current gradient to selected element’s fill or stroke Parameters type - String indicating “fill” or “stroke” to apply to an element

findDuplicateGradient

var findDuplicateGradient = function( grad )

Check if exact gradient already exists

Parameters

• grad The gradient DOM element to compare to others

Returns

The existing gradient if found, null if not

setPaint

this.setPaint = function( type, paint )

Set a color/gradient to a fill/stroke

Parameters

• type String with “fill” or “stroke”
• paint The jGraduate paint object to apply

getStrokeWidth

this.getStrokeWidth = function()

Returns the current stroke-width value

setStrokeWidth

this.setStrokeWidth = function( val )

Sets the stroke width for the current selected elements When attempting to set a line’s width to 0, this changes it to 1 instead

Parameters

• val A Float indicating the new stroke width value

setStrokeAttr

this.setStrokeAttr = function( attr, val )

Set the given stroke-related attribute the given value for selected elements

Parameters

• attr String with the attribute name
• val String or number with the attribute value

getOpacity

this.getOpacity = function()

Returns the current opacity

setOpacity

this.setOpacity = function( val )

Sets the given opacity to the current selected elements

getOpacity

Returns the current fill opacity

getStrokeOpacity

this.getStrokeOpacity = function()

Returns the current stroke opacity

setPaintOpacity

this.setPaintOpacity = function( type, val, preventUndo )

Sets the current fill/stroke opacity

Parameters

• type String with “fill” or “stroke”
• val Float with the new opacity value
• preventUndo Boolean indicating whether or not this should be an undoable action

getBlur

this.getBlur = function( elem )

Gets the stdDeviation blur value of the given element

Parameters

• elem The element to check the blur value for

setBlurNoUndo

canvas.setBlurNoUndo = function( val )

Sets the stdDeviation blur value on the selected element without being undoable

Parameters

• val The new stdDeviation value

setBlurOffsets

canvas.setBlurOffsets = function( filter, stdDev )

Sets the x, y, with, height values of the filter element in order to make the blur not be clipped. Removes them if not neeeded

Parameters

• filter The filter DOM element to update
• stdDev The standard deviation value on which to base the offset size

setBlur

canvas.setBlur = function( val, complete )

Adds/updates the blur filter to the selected element

Parameters

• val Float with the new stdDeviation blur value
• complete Boolean indicating whether or not the action should be completed (to add to the undo manager)

getBold

this.getBold = function()

Check whether selected element is bold or not

Returns

Boolean indicating whether or not element is bold

setBold

this.setBold = function( b )

Make the selected element bold or normal

Parameters

• b Boolean indicating bold true or normal false

getItalic

this.getItalic = function()

Check whether selected element is italic or not

Returns

Boolean indicating whether or not element is italic

setItalic

this.setItalic = function( i )

Make the selected element italic or normal

Parameters

• b Boolean indicating italic (true) or normal (false)

getFontFamily

this.getFontFamily = function()

Returns the current font family

setFontFamily

this.setFontFamily = function( val )

Set the new font family

Parameters

• val String with the new font family

getFontSize

this.getFontSize = function()

Returns the current font size

setFontSize

this.setFontSize = function( val )

Applies the given font size to the selected element

Parameters

• val Float with the new font size

getText

this.getText = function()

Returns the current text textContent of the selected element

setTextContent

this.setTextContent = function( val )

Updates the text element with the given string

Parameters

• val String with the new text

setImageURL

this.setImageURL = function( val )

Sets the new image URL for the selected image element. Updates its size if a new URL is given

Parameters

• val String with the image URL/path

setRectRadius

this.setRectRadius = function( val )

Sets the rx & ry values to the selected rect element to change its corner radius

Parameters

• val The new radius

Element manipulation

setSegType

this.setSegType = function( new_type )

Sets the new segment type to the selected segment(s).

Parameters

• new_type Integer with the new segment type See http://www.w3.org/TR/SVG/paths.html#InterfaceSVGPathSeg for list

convertToPath

this.convertToPath = function( elem, getBBox )

Convert selected element to a path, or get the BBox of an element-as-path

Parameters

• elem The DOM element to be converted
• getBBox Boolean on whether or not to only return the path’s BBox

Returns

If the getBBox flag is true, the resulting path’s bounding box object. Otherwise the resulting path element is returned.

changeSelectedAttributeNoUndo

var changeSelectedAttributeNoUndo = function( attr, newValue, elems )

This function makes the changes to the elements. It does not add the change to the history stack.

Parameters

• attr String with the attribute name
• newValue String or number with the new attribute value
• elems The DOM elements to apply the change to

changeSelectedAttribute

var changeSelectedAttribute = this.changeSelectedAttribute = function( attr, val, elems )

Change the given/selected element and add the original value to the history stack 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.

Parameters

• attr String with the attribute name
• newValue String or number with the new attribute value
• elems The DOM elements to apply the change to

deleteSelectedElements

this.deleteSelectedElements = function()

Removes all selected elements from the DOM and adds the change to the history stack

groupSelectedElements

this.groupSelectedElements = function()

Wraps all the selected elements in a group (g) element

ungroupSelectedElement

this.ungroupSelectedElement = function()

Unwraps all the elements in a selected group (g) element. This requires significant recalculations to apply group’s transforms, etc to its children

moveToTopSelectedElement

this.moveToTopSelectedElement = function()

Repositions the selected element to the bottom in the DOM to appear on top of other elements

moveToBottomSelectedElement

this.moveToBottomSelectedElement = function()

Repositions the selected element to the top in the DOM to appear under other elements

moveSelectedElements

this.moveSelectedElements = function( dx, dy, undoable )

Moves selected elements on the X/Y axis

Parameters

• dx Float with the distance to move on the x-axis
• dy Float with the distance to move on the y-axis
• undoable Boolean indicating whether or not the action should be undoable

Returns

Batch command for the move

cloneSelectedElements

this.cloneSelectedElements = function()

Create deep DOM copies (clones) of all selected elements and move them slightly from their originals

alignSelectedElements

this.alignSelectedElements = function( type, relative_to )

Aligns selected elements

Parameters

• type String with single character indicating the alignment type
• relative_to String that must be one of the following: “selected”, “largest”, “smallest”, “page”

Additional editor tools

updateCanvas

this.updateCanvas = function( w, h )

Updates the editor canvas width/height/position after a zoom has occurred

Parameters

• w Float with the new width
• h Float with the new height

Returns

Object with the following values:

• x - The canvas’ new x coordinate
• y - The canvas’ new y coordinate
• old_x - The canvas’ old x coordinate
• old_y - The canvas’ old y coordinate
• d_x - The x position difference
• d_y - The y position difference

setBackground

this.setBackground = function( color, url )

Set the background of the editor (NOT the actual document)

Parameters

• color String with fill color to apply
• url URL or path to image to use

cycleElement

this.cycleElement = function( next )

Select the next/previous element within the current layer

Parameters

• next Boolean where true = next and false = previous element