svgedit/editor/coords.js

/**
 * Coords.
 *
 * Licensed under the MIT License
 *
 */

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

var svgedit = svgedit || {};

(function() {

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'];
					
var editorContext_ = null;

svgedit.coords.init = function(editorContext) {
  editorContext_ = editorContext;
};

// Function: remapElement
// 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
svgedit.coords.remapElement = function(selected, changes, m) {
  var 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() {
      if (doSnapping) for (var o in changes) changes[o] = svgedit.utilities.snapToGrid(changes[o]);
      svgedit.utilities.assignAttributes(selected, changes, 1000, true);
    },
    box = svgedit.utilities.getBBox(selected);
	
  for (var i = 0; i < 2; i++) {
    var 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;
  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,
          t_new = svgedit.math.matrixMultiply(existing.inverse(), m, existing);
      changes.x = parseFloat(changes.x) + t_new.e;
      changes.y = parseFloat(changes.y) + t_new.f;
      // TODO(codedread): Special handing for tspans:
      // <g transform="translate(-100,0)">
      //   <text x="100" y="100">
      //     <tspan x="200" y="100">...</tspan>
      //   </text>
      // </g>
      //
      // Note that if the <text> element's x/y coordinates are being
      // adjusted, the tspan's x/y coordinates also need to be similarly
      // transformed as the coordinate space is not nested:
      // <text x="0" y="100">
      //   <tspan x="100" y="100">...</tspan>
      // </text>
    } else {
      // we just absorb all matrices into the element and don't do any remapping
      var chlist = svgedit.transformlist.getTransformList(selected);
      var mt = svgroot.createSVGTransform();
      mt.setMatrix(svgedit.math.matrixMultiply(svgedit.math.transformListToTransform(chlist).matrix, m));
      chlist.clear();
      chlist.appendItem(mt);
    }
  }
	
  // 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
        var chlist = svgedit.transformlist.getTransformList(selected);
        var mt = svgroot.createSVGTransform();
        mt.setMatrix(svgedit.math.matrixMultiply(svgedit.math.transformListToTransform(chlist).matrix, m));
        chlist.clear();
        chlist.appendItem(mt);
      } else {
        var 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':
      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);
      changes.rx = Math.abs(changes.rx);
      changes.ry = Math.abs(changes.ry);
      finishUp();
      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
      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':
      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;
	  // deliberately fall through here
    case 'text':
    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':
      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;
      }

      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 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
		};
	}
	
	var len = changes.d.length,
		firstseg = changes.d[0],
		currentpt = remap(firstseg.x, firstseg.y);
	changes.d[0].x = currentpt.x;
	changes.d[0].y = currentpt.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 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 = '';
	var len = changes.d.length;
	for (var i = 0; i < len; ++i) {
		var seg = changes.d[i];
		var 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;
	}
};

})();