Created
February 27, 2011 04:28
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Convert a SVG path to a Polygon by sampling the path, but also including all control points in the result. See http://phrogz.net/SVG/convert_path_to_polygon.xhtml
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| // http://phrogz.net/SVG/convert_path_to_polygon.xhtml | |
| function pathToPolygon(path,samples){ | |
| if (!samples) samples = 0; | |
| var doc = path.ownerDocument; | |
| var poly = doc.createElementNS('http://www.w3.org/2000/svg','polygon'); | |
| // Put all path segments in a queue | |
| for (var segs=[],s=path.pathSegList,i=s.numberOfItems-1;i>=0;--i) segs[i] = s.getItem(i); | |
| var segments = segs.concat(); | |
| var seg,lastSeg,points=[],x,y; | |
| var addSegmentPoint = function(s){ | |
| if (s.pathSegType == SVGPathSeg.PATHSEG_CLOSEPATH){ | |
| }else{ | |
| if (s.pathSegType%2==1 && s.pathSegType>1){ | |
| // All odd-numbered path types are relative, except PATHSEG_CLOSEPATH (1) | |
| x+=s.x; y+=s.y; | |
| }else{ | |
| x=s.x; y=s.y; | |
| } | |
| var lastPoint = points[points.length-1]; | |
| if (!lastPoint || x!=lastPoint[0] || y!=lastPoint[1]) points.push([x,y]); | |
| } | |
| }; | |
| for (var d=0,len=path.getTotalLength(),step=len/samples;d<=len;d+=step){ | |
| var seg = segments[path.getPathSegAtLength(d)]; | |
| var pt = path.getPointAtLength(d); | |
| if (seg != lastSeg){ | |
| lastSeg = seg; | |
| while (segs.length && segs[0]!=seg) addSegmentPoint( segs.shift() ); | |
| } | |
| var lastPoint = points[points.length-1]; | |
| if (!lastPoint || pt.x!=lastPoint[0] || pt.y!=lastPoint[1]) points.push([pt.x,pt.y]); | |
| } | |
| for (var i=0,len=segs.length;i<len;++i) addSegmentPoint(segs[i]); | |
| for (var i=0,len=points.length;i<len;++i) points[i] = points[i].join(','); | |
| poly.setAttribute('points',points.join(' ')); | |
| return poly; | |
| } |
SVGPathElement.getPathSegAtLength is removed from Chrome.
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Great work! We've implemented it in svg.topoly.js a plugin for svg.js.