svgedit/editor/coords.js

/* eslint-disable no-var */
/* globals $, svgroot */
/**
 * Coords.
 *
 * Licensed under the MIT License
 *
 */

// Dependencies:
// 1) jquery.js
// 2) math.js
// 3) pathseg.js
// 4) browser.js
// 5) svgutils.js
// 6) units.js
// 7) svgtransformlist.js

var svgedit = svgedit || {}; // eslint-disable-line no-use-before-define

(function () {
'use strict';

if (!svgedit.coords) {
  svgedit.coords = {};
}

// 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',
  'H', 'h', 'V', 'v', 'S', 's', 'T', 't'];

/**
 * @typedef editorContext
 * @type {?object}
 * @property {function} getGridSnapping
 * @property {function} getDrawing
*/
var editorContext_ = null;

/**
* @param {editorContext} editorContext
*/
svgedit.coords.init = function (editorContext) {
  editorContext_ = editorContext;
};

/**
 * Applies coordinate changes to an element based on the given matrix
 * @param {Element} selected - DOM element to be changed
 * @param {Object} changes - Object with changes to be remapped
 * @param {SVGMatrix} m - Matrix object to use for remapping coordinates
*/
svgedit.coords.remapElement = function (selected, changes, m) {
  var i, type,
    remap = function (x, y) { return svgedit.math.transformPoint(x, y, m); },
    scalew = function (w) { return m.a * w; },
    scaleh = function (h) { return m.d * h; },
    doSnapping = editorContext_.getGridSnapping() && selected.parentNode.parentNode.localName === 'svg',
    finishUp = function () {
      var o;
      if (doSnapping) {
        for (o in changes) {
          changes[o] = svgedit.utilities.snapToGrid(changes[o]);
        }
      }
      svgedit.utilities.assignAttributes(selected, changes, 1000, true);
    },
    box = svgedit.utilities.getBBox(selected);

  for (i = 0; i < 2; i++) {
    type = i === 0 ? 'fill' : 'stroke';
    var attrVal = selected.getAttribute(type);
    if (attrVal && attrVal.indexOf('url(') === 0) {
      if (m.a < 0 || m.d < 0) {
        var grad = svgedit.utilities.getRefElem(attrVal);
        var newgrad = grad.cloneNode(true);
        if (m.a < 0) {
          // flip x
          var x1 = newgrad.getAttribute('x1');
          var x2 = newgrad.getAttribute('x2');
          newgrad.setAttribute('x1', -(x1 - 1));
          newgrad.setAttribute('x2', -(x2 - 1));
        }

        if (m.d < 0) {
          // flip y
          var y1 = newgrad.getAttribute('y1');
          var y2 = newgrad.getAttribute('y2');
          newgrad.setAttribute('y1', -(y1 - 1));
          newgrad.setAttribute('y2', -(y2 - 1));
        }
        newgrad.id = editorContext_.getDrawing().getNextId();
        svgedit.utilities.findDefs().appendChild(newgrad);
        selected.setAttribute(type, 'url(#' + newgrad.id + ')');
      }

      // Not really working :(
      // if (selected.tagName === 'path') {
      //   reorientGrads(selected, m);
      // }
    }
  }

  var elName = selected.tagName;
  var chlist, mt;
  if (elName === 'g' || elName === 'text' || elName === 'tspan' || elName === 'use') {
    // if it was a translate, then just update x,y
    if (m.a === 1 && m.b === 0 && m.c === 0 && m.d === 1 && (m.e !== 0 || m.f !== 0)) {
      // [T][M] = [M][T']
      // therefore [T'] = [M_inv][T][M]
      var existing = svgedit.math.transformListToTransform(selected).matrix,
        tNew = svgedit.math.matrixMultiply(existing.inverse(), m, existing);
      changes.x = parseFloat(changes.x) + tNew.e;
      changes.y = parseFloat(changes.y) + tNew.f;
    } else {
      // we just absorb all matrices into the element and don't do any remapping
      chlist = svgedit.transformlist.getTransformList(selected);
      mt = svgroot.createSVGTransform();
      mt.setMatrix(svgedit.math.matrixMultiply(svgedit.math.transformListToTransform(chlist).matrix, m));
      chlist.clear();
      chlist.appendItem(mt);
    }
  }
  var c, pt, pt1, pt2, len;
  // now we have a set of changes and an applied reduced transform list
  // we apply the changes directly to the DOM
  switch (elName) {
  case 'foreignObject':
  case 'rect':
  case 'image':
    // Allow images to be inverted (give them matrix when flipped)
    if (elName === 'image' && (m.a < 0 || m.d < 0)) {
      // Convert to matrix
      chlist = svgedit.transformlist.getTransformList(selected);
      mt = svgroot.createSVGTransform();
      mt.setMatrix(svgedit.math.matrixMultiply(svgedit.math.transformListToTransform(chlist).matrix, m));
      chlist.clear();
      chlist.appendItem(mt);
    } else {
      pt1 = remap(changes.x, changes.y);
      changes.width = scalew(changes.width);
      changes.height = scaleh(changes.height);
      changes.x = pt1.x + Math.min(0, changes.width);
      changes.y = pt1.y + Math.min(0, changes.height);
      changes.width = Math.abs(changes.width);
      changes.height = Math.abs(changes.height);
    }
    finishUp();
    break;
  case 'ellipse':
    c = remap(changes.cx, changes.cy);
    changes.cx = c.x;
    changes.cy = c.y;
    changes.rx = scalew(changes.rx);
    changes.ry = scaleh(changes.ry);
    changes.rx = Math.abs(changes.rx);
    changes.ry = Math.abs(changes.ry);
    finishUp();
    break;
  case 'circle':
    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
    var tbox = svgedit.math.transformBox(box.x, box.y, box.width, box.height, m);
    var w = tbox.tr.x - tbox.tl.x, h = tbox.bl.y - tbox.tl.y;
    changes.r = Math.min(w / 2, h / 2);

    if (changes.r) { changes.r = Math.abs(changes.r); }
    finishUp();
    break;
  case 'line':
    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;
    // deliberately fall through here
  case 'text':
  case 'tspan':
  case 'use':
    finishUp();
    break;
  case 'g':
    var gsvg = $(selected).data('gsvg');
    if (gsvg) {
      svgedit.utilities.assignAttributes(gsvg, changes, 1000, true);
    }
    break;
  case 'polyline':
  case 'polygon':
    len = changes.points.length;
    for (i = 0; i < len; ++i) {
      pt = changes.points[i];
      pt = remap(pt.x, pt.y);
      changes.points[i].x = pt.x;
      changes.points[i].y = pt.y;
    }

    len = changes.points.length;
    var pstr = '';
    for (i = 0; i < len; ++i) {
      pt = changes.points[i];
      pstr += pt.x + ',' + pt.y + ' ';
    }
    selected.setAttribute('points', pstr);
    break;
  case 'path':
    var seg;
    var segList = selected.pathSegList;
    len = segList.numberOfItems;
    changes.d = [];
    for (i = 0; i < len; ++i) {
      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
      };
    }

    len = changes.d.length;
    var firstseg = changes.d[0],
      currentpt = remap(firstseg.x, firstseg.y);
    changes.d[0].x = currentpt.x;
    changes.d[0].y = currentpt.y;
    for (i = 1; i < len; ++i) {
      seg = changes.d[i];
      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 thisx = (seg.x !== undefined) ? seg.x : currentpt.x, // for V commands
          thisy = (seg.y !== undefined) ? seg.y : currentpt.y; // for H commands
        pt = remap(thisx, thisy);
        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

    var dstr = '';
    len = changes.d.length;
    for (i = 0; i < len; ++i) {
      seg = changes.d[i];
      type = seg.type;
      dstr += pathMap[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.x1 + ',' + seg.y1 + ' ' + seg.x + ',' + seg.y + ' ';
        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.x2 + ',' + seg.y2 + ' ' + seg.x + ',' + seg.y + ' ';
        break;
      }
    }

    selected.setAttribute('d', dstr);
    break;
  }
};
}());