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svgparser.js
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/*!
* SvgParser
* A library to convert an SVG string to parse-able segments for CAD/CAM use
* Licensed under the MIT license
*/
(function(root){
'use strict';
function SvgParser(){
// the SVG document
this.svg;
// the top level SVG element of the SVG document
this.svgRoot;
// elements that can be imported
this.allowedElements = ['svg','circle','ellipse','path','polygon','polyline','rect','image','line'];
// elements that can be polygonified
this.polygonElements = ['svg','circle','ellipse','path','polygon','polyline','rect'];
this.conf = {
tolerance: 2, // max bound for bezier->line segment conversion, in native SVG units
toleranceSvg: 0.01, // fudge factor for browser inaccuracy in SVG unit handling
scale: 72,
endpointTolerance: 2
};
this.dirPath = null;
}
SvgParser.prototype.config = function(config){
this.conf.tolerance = Number(config.tolerance);
this.conf.endpointTolerance = Number(config.endpointTolerance);
}
SvgParser.prototype.load = function(dirpath, svgString, scale, scalingFactor){
if(!svgString || typeof svgString !== 'string'){
throw Error('invalid SVG string');
}
// small hack. inkscape svgs opened and saved in illustrator will fail from a lack of an inkscape xmlns
if(/inkscape/.test(svgString) && !/xmlns:inkscape/.test(svgString)){
svgString = svgString.replace(/xmlns=/i, ' xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape" xmlns=');
}
var parser = new DOMParser();
var svg = parser.parseFromString(svgString, "image/svg+xml");
this.dirPath = dirpath;
var failed = svg.documentElement.nodeName.indexOf('parsererror')>-1;
if(failed){
console.log('svg DOM parsing error: '+svg.documentElement.nodeName);
}
if(svg){
// scale the svg so that our scale parameter is preserved
var root = svg.firstElementChild;
this.svg = svg;
this.svgRoot = root;
// get local scaling factor from svg root "width" dimension
var width = root.getAttribute('width');
var viewBox = root.getAttribute('viewBox');
var transform = root.getAttribute('transform') || '';
if(!width || !viewBox){
if(!scalingFactor){
return this.svgRoot;
}
else{
// apply absolute scaling
transform += ' scale('+scalingFactor+')';
root.setAttribute('transform', transform);
this.conf.scale *= scalingFactor;
return this.svgRoot;
}
}
width = width.trim();
viewBox = viewBox.trim().split(/[\s,]+/);
if(!width || viewBox.length < 4){
return this.svgRoot;
}
var pxwidth = viewBox[2];
// localscale is in pixels/inch, regardless of units
var localscale = null;
if(/in/.test(width)){
width = Number(width.replace(/[^0-9\.]/g, ''));
localscale = pxwidth/width;
}
else if(/mm/.test(width)){
width = Number(width.replace(/[^0-9\.]/g, ''));
localscale = (25.4*pxwidth)/width;
}
else if(/cm/.test(width)){
width = Number(width.replace(/[^0-9\.]/g, ''));
localscale = (2.54*pxwidth)/width;
}
else if(/pt/.test(width)){
width = Number(width.replace(/[^0-9\.]/g, ''));
localscale = (72*pxwidth)/width;
}
else if(/pc/.test(width)){
width = Number(width.replace(/[^0-9\.]/g, ''));
localscale = (6*pxwidth)/width;
}
// these are css "pixels"
else if(/px/.test(width)){
width = Number(width.replace(/[^0-9\.]/g, ''));
localscale = (96*pxwidth)/width;
}
if(localscale === null){
localscale = scalingFactor;
}
else if(scalingFactor){
localscale *= scalingFactor;
}
// no scaling factor
if(localscale === null){
console.log('no scale');
return this.svgRoot;
}
transform = root.getAttribute('transform') || '';
transform += ' scale('+(scale/localscale)+')';
root.setAttribute('transform', transform);
this.conf.scale *= scale/localscale;
}
return this.svgRoot;
}
// use the utility functions in this class to prepare the svg for CAD-CAM/nest related operations
SvgParser.prototype.cleanInput = function(dxfFlag){
// apply any transformations, so that all path positions etc will be in the same coordinate space
this.applyTransform(this.svgRoot, '', false, dxfFlag);
// remove any g elements and bring all elements to the top level
this.flatten(this.svgRoot);
// remove any non-geometric elements like text
this.filter(this.allowedElements);
this.imagePaths(this.svgRoot);
//console.log(this.svgRoot);
// split any compound paths into individual path elements
this.recurse(this.svgRoot, this.splitPath);
//console.log(this.svgRoot);
// this kills overlapping lines, but may have unexpected edge cases
// eg. open paths that share endpoints with segments of closed paths
/*this.splitLines(this.svgRoot);
this.mergeOverlap(this.svgRoot, 0.1*this.conf.toleranceSvg);*/
// merge open paths into closed paths
// for numerically accurate exports
this.mergeLines(this.svgRoot, this.conf.toleranceSvg);
console.log('this is the scale ',this.conf.scale*(0.02), this.conf.endpointTolerance);
//console.log('scale',this.conf.scale);
// for exports with wide gaps, roughly 0.005 inch
this.mergeLines(this.svgRoot, this.conf.endpointTolerance);
// finally close any open paths with a really wide margin
this.mergeLines(this.svgRoot, 3*this.conf.endpointTolerance);
return this.svgRoot;
}
SvgParser.prototype.imagePaths = function(svg){
if(!this.dirPath){
return false;
}
for(var i=0; i<svg.children.length; i++){
var e = svg.children[i];
if(e.tagName == 'image'){
var relpath = e.getAttribute('href');
if(!relpath){
relpath = e.getAttribute('xlink:href');
}
var abspath = this.dirPath + '/' + relpath;
e.setAttribute('href', abspath);
e.setAttribute('data-href',relpath);
}
}
}
// return a path from list that has one and only one endpoint that is coincident with the given path
SvgParser.prototype.getCoincident = function(path, list, tolerance){
var index = list.indexOf(path);
if(index < 0 || index == list.length-1){
return null;
}
var coincident = [];
for(var i=index+1; i<list.length; i++){
var c = list[i];
if(GeometryUtil.almostEqualPoints(path.endpoints.start, c.endpoints.start, tolerance)){
coincident.push({path: c, reverse1: true, reverse2: false});
}
else if(GeometryUtil.almostEqualPoints(path.endpoints.start, c.endpoints.end, tolerance)){
coincident.push({path: c, reverse1: true, reverse2: true});
}
else if(GeometryUtil.almostEqualPoints(path.endpoints.end, c.endpoints.end, tolerance)){
coincident.push({path: c, reverse1: false, reverse2: true});
}
else if(GeometryUtil.almostEqualPoints(path.endpoints.end, c.endpoints.start, tolerance)){
coincident.push({path: c, reverse1: false, reverse2: false});
}
}
// there is an edge case here where the start point of 3 segments coincide. not going to bother...
if(coincident.length > 0){
return coincident[0];
}
return null;
}
SvgParser.prototype.mergeLines = function(root, tolerance){
/*for(var i=0; i<root.children.length; i++){
var p = root.children[i];
if(!this.isClosed(p)){
this.reverseOpenPath(p);
}
}
return false;*/
var openpaths = [];
for(var i=0; i<root.children.length; i++){
var p = root.children[i];
if(!this.isClosed(p, tolerance)){
openpaths.push(p);
}
else if(p.tagName == 'path'){
var lastCommand = p.pathSegList.getItem(p.pathSegList.numberOfItems-1).pathSegTypeAsLetter;
if(lastCommand != 'z' && lastCommand != 'Z'){
// endpoints are actually far apart
p.pathSegList.appendItem(p.createSVGPathSegClosePath());
}
}
}
// record endpoints
for(i=0; i<openpaths.length; i++){
var p = openpaths[i];
p.endpoints = this.getEndpoints(p);
}
for(i=0; i<openpaths.length; i++){
var p = openpaths[i];
var c = this.getCoincident(p, openpaths, tolerance);
while(c){
if(c.reverse1){
this.reverseOpenPath(p);
}
if(c.reverse2){
this.reverseOpenPath(c.path);
}
/*if(openpaths.length == 2){
console.log('premerge A', p.getAttribute('x1'), p.getAttribute('y1'), p.getAttribute('x2'), p.getAttribute('y2'), p.endpoints);
console.log('premerge B', c.path.getAttribute('x1'), c.path.getAttribute('y1'), c.path.getAttribute('x2'), c.path.getAttribute('y2'), c.path.endpoints);
console.log('premerge C', c.reverse1, c.reverse2);
}*/
var merged = this.mergeOpenPaths(p,c.path);
if(!merged){
break;
}
/*if(openpaths.length == 2){
console.log('merged 1', (new XMLSerializer()).serializeToString(p));
console.log('merged 2', (new XMLSerializer()).serializeToString(c.path), c.reverse1, c.reverse2, p.endpoints);
console.log('merged 3', (new XMLSerializer()).serializeToString(merged));
console.log('merged 4', p.endpoints, c.path.endpoints);
console.log(root);
}*/
openpaths.splice(openpaths.indexOf(c.path), 1);
root.appendChild(merged);
openpaths.splice(i,1, merged);
if(this.isClosed(merged, tolerance)){
var lastCommand = merged.pathSegList.getItem(merged.pathSegList.numberOfItems-1).pathSegTypeAsLetter;
if(lastCommand != 'z' && lastCommand != 'Z'){
// endpoints are actually far apart
console.log(merged);
merged.pathSegList.appendItem(merged.createSVGPathSegClosePath());
}
openpaths.splice(i,1);
i--;
break;
}
merged.endpoints = this.getEndpoints(merged);
p = merged;
c = this.getCoincident(p, openpaths, tolerance);
}
}
}
// merge all line objects that overlap eachother
SvgParser.prototype.mergeOverlap = function(root, tolerance){
var min2 = 0.001;
var paths = Array.prototype.slice.call(root.children);
var linelist = paths.filter(function(p){
return p.tagName == 'line';
});
var merge = function(lines){
var count = 0;
for(var i=0; i<lines.length; i++){
var A1 = {
x: parseFloat(lines[i].getAttribute('x1')),
y: parseFloat(lines[i].getAttribute('y1'))
};
var A2 = {
x: parseFloat(lines[i].getAttribute('x2')),
y: parseFloat(lines[i].getAttribute('y2'))
};
var Ax2 = (A2.x-A1.x)*(A2.x-A1.x);
var Ay2 = (A2.y-A1.y)*(A2.y-A1.y);
if(Ax2+Ay2 < min2){
continue;
}
var angle = Math.atan2((A2.y-A1.y),(A2.x-A1.x));
var c = Math.cos(-angle);
var s = Math.sin(-angle);
var c2 = Math.cos(angle);
var s2 = Math.sin(angle);
var relA2 = {x: A2.x-A1.x, y: A2.y-A1.y};
var rotA2x = relA2.x * c - relA2.y * s;
for(var j=i+1; j<lines.length; j++){
var B1 = {
x: parseFloat(lines[j].getAttribute('x1')),
y: parseFloat(lines[j].getAttribute('y1'))
};
var B2 = {
x: parseFloat(lines[j].getAttribute('x2')),
y: parseFloat(lines[j].getAttribute('y2'))
};
var Bx2 = (B2.x-B1.x)*(B2.x-B1.x);
var By2 = (B2.y-B1.y)*(B2.y-B1.y);
if(Bx2+By2 < min2){
continue;
}
// B relative to A1 (our point of rotation)
var relB1 = {x: B1.x - A1.x, y: B1.y - A1.y};
var relB2 = {x: B2.x - A1.x, y: B2.y - A1.y};
// rotate such that A1 and A2 are horizontal
var rotB1 = {x: relB1.x * c - relB1.y * s, y: relB1.x * s + relB1.y * c};
var rotB2 = {x: relB2.x * c - relB2.y * s, y: relB2.x * s + relB2.y * c};
if(!GeometryUtil.almostEqual(rotB1.y, 0, tolerance) || !GeometryUtil.almostEqual(rotB2.y, 0, tolerance)){
continue;
}
var min1 = Math.min(0, rotA2x);
var max1 = Math.max(0, rotA2x);
var min2 = Math.min(rotB1.x, rotB2.x);
var max2 = Math.max(rotB1.x, rotB2.x);
// not overlapping
if(min2 > max1 || max2 < min1){
continue;
}
var len = 0;
var relC1x = 0;
var relC2x = 0;
// A is B
if(GeometryUtil.almostEqual(min1, min2, tolerance) && GeometryUtil.almostEqual(max1, max2, tolerance)){
lines.splice(j,1);
j--;
count++;
continue;
}
// A inside B
else if(min1 > min2 && max1 < max2){
lines.splice(i,1);
i--;
count++;
break;
}
// B inside A
else if(min2 > min1 && max2 < max1){
lines.splice(j,1);
i--;
count++;
break;
}
// some overlap but not total
len = Math.max(0, Math.min(max1, max2) - Math.max(min1, min2));
relC1x = Math.max(max1, max2);
relC2x = Math.min(min1, min2);
if(len*len > min2){
var relC1 = {x: relC1x * c2, y: relC1x * s2};
var relC2 = {x: relC2x * c2, y: relC2x * s2};
var C1 = {x: relC1.x + A1.x, y: relC1.y + A1.y};
var C2 = {x: relC2.x + A1.x, y: relC2.y + A1.y};
lines.splice(j,1);
lines.splice(i,1);
var line = document.createElementNS('http://www.w3.org/2000/svg', 'line');
line.setAttribute('x1', C1.x);
line.setAttribute('y1', C1.y);
line.setAttribute('x2', C2.x);
line.setAttribute('y2', C2.y);
lines.push(line);
i--;
count++;
break;
}
}
}
return count;
}
var c = merge(linelist);
while(c > 0){
c = merge(linelist);
}
paths = Array.prototype.slice.call(root.children);
for(var i=0; i<paths.length; i++){
if(paths[i].tagName == 'line'){
root.removeChild(paths[i]);
}
}
for(i=0; i<linelist.length; i++){
root.appendChild(linelist[i]);
}
}
// split paths and polylines into separate line objects
SvgParser.prototype.splitLines = function(root){
var paths = Array.prototype.slice.call(root.children);
var lines = [];
var addLine = function(x1, y1, x2, y2){
if(x1==x2 && y1==y2){
return;
}
var line = document.createElementNS('http://www.w3.org/2000/svg', 'line');
line.setAttribute('x1', x1);
line.setAttribute('x2', x2);
line.setAttribute('y1', y1);
line.setAttribute('y2', y2);
root.appendChild(line);
}
for(var i=0; i<paths.length; i++){
var path = paths[i];
if(path.tagName == 'polyline' || path.tagName == 'polygon'){
if(path.points.length < 2){
continue;
}
for(var j=0; j<path.points.length-1; j++){
var p1 = path.points[j];
var p2 = path.points[j+1];
addLine(p1.x, p1.y, p2.x, p2.y);
}
if(path.tagName == 'polygon'){
var p1 = path.points[path.points.length-1];
var p2 = path.points[0];
addLine(p1.x, p1.y, p2.x, p2.y);
}
root.removeChild(path);
}
else if(path.tagName == 'rect'){
var x = parseFloat(path.getAttribute('x'));
var y = parseFloat(path.getAttribute('y'));
var w = parseFloat(path.getAttribute('width'));
var h = parseFloat(path.getAttribute('height'));
addLine(x,y, x+w, y);
addLine(x+w,y, x+w, y+h);
addLine(x+w,y+h, x, y+h);
addLine(x,y+h, x, y);
root.removeChild(path);
}
else if(path.tagName == 'path'){
this.pathToAbsolute(path);
var split = this.splitPathSegments(path);
console.log(split);
split.forEach(function(e){
root.appendChild(e);
});
}
}
}
// turn one path into individual segments
SvgParser.prototype.splitPathSegments = function(path){
// we'll assume that splitpath has already been run on this path, and it only has one M/m command
var seglist = path.pathSegList;
var split = [];
var addLine = function(x1, y1, x2, y2){
if(x1==x2 && y1==y2){
return;
}
var line = document.createElementNS('http://www.w3.org/2000/svg', 'line');
line.setAttribute('x1', x1);
line.setAttribute('x2', x2);
line.setAttribute('y1', y1);
line.setAttribute('y2', y2);
split.push(line);
}
var x=0, y=0, x0=0, y0=0, x1=0, y1=0, x2=0, y2=0, prevx=0, prevy=0;
for(var i=0; i<seglist.numberOfItems; i++){
var command = seglist.getItem(i).pathSegTypeAsLetter;
var s = seglist.getItem(i);
prevx = x;
prevy = y;
if ('x' in s) x=s.x;
if ('y' in s) y=s.y;
// replace linear moves with M commands
switch(command){
case 'L': addLine(prevx, prevy, x, y); seglist.replaceItem(path.createSVGPathSegMovetoAbs(x,y),i); break;
case 'H': addLine(prevx, prevy, x, y); seglist.replaceItem(path.createSVGPathSegMovetoAbs(x,y),i); break;
case 'V': addLine(prevx, prevy, x, y); seglist.replaceItem(path.createSVGPathSegMovetoAbs(x,y),i); break;
case 'z': case 'Z': addLine(x,y,x0,y0); seglist.removeItem(i); break;
}
// Record the start of a subpath
if (command=='M' || command=='m') x0=x, y0=y;
}
// this happens in place
this.splitPath(path);
return split;
};
// reverse an open path in place, where an open path could by any of line, polyline or path types
SvgParser.prototype.reverseOpenPath = function(path){
/*if(path.endpoints){
var temp = path.endpoints.start;
path.endpoints.start = path.endpoints.end;
path.endpoints.end = temp;
}*/
if(path.tagName == 'line'){
var x1 = path.getAttribute('x1');
var x2 = path.getAttribute('x2');
var y1 = path.getAttribute('y1');
var y2 = path.getAttribute('y2');
path.setAttribute('x1', x2);
path.setAttribute('y1', y2);
path.setAttribute('x2', x1);
path.setAttribute('y2', y1);
}
else if(path.tagName == 'polyline'){
var points = [];
for(var i=0; i<path.points.length; i++){
points.push(path.points[i]);
}
points = points.reverse();
path.points.clear();
for(i=0; i<points.length; i++){
path.points.appendItem(points[i]);
}
}
else if(path.tagName == 'path'){
this.pathToAbsolute(path);
var seglist = path.pathSegList;
var reversed = [];
var firstCommand = seglist.getItem(0);
var lastCommand = seglist.getItem(seglist.numberOfItems-1);
var x=0, y=0, x0=0, y0=0, x1=0, y1=0, x2=0, y2=0, prevx=0, prevy=0, prevx1=0, prevy1=0, prevx2=0, prevy2=0;
for(var i=0; i<seglist.numberOfItems; i++){
var s = seglist.getItem(i);
var command = s.pathSegTypeAsLetter;
prevx = x;
prevy = y;
prevx1 = x1;
prevy1 = y1;
prevx2 = x2;
prevy2 = y2;
if (/[MLHVCSQTA]/.test(command)){
if ('x1' in s) x1=s.x1;
if ('x2' in s) x2=s.x2;
if ('y1' in s) y1=s.y1;
if ('y2' in s) y2=s.y2;
if ('x' in s) x=s.x;
if ('y' in s) y=s.y;
}
switch(command){
// linear line types
case 'M':
reversed.push( y, x );
break;
case 'L':
case 'H':
case 'V':
reversed.push( 'L', y, x );
break;
// Quadratic Beziers
case 'T':
// implicit control point
if(i > 0 && /[QqTt]/.test(seglist.getItem(i-1).pathSegTypeAsLetter)){
x1 = prevx + (prevx-prevx1);
y1 = prevy + (prevy-prevy1);
}
else{
x1 = prevx;
y1 = prevy;
}
case 'Q':
reversed.push( y1, x1, 'Q', y, x );
break;
case 'S':
if(i > 0 && /[CcSs]/.test(seglist.getItem(i-1).pathSegTypeAsLetter)){
x1 = prevx + (prevx-prevx2);
y1 = prevy + (prevy-prevy2);
}
else{
x1 = prevx;
y1 = prevy;
}
case 'C':
reversed.push( y1, x1, y2, x2, 'C', y, x );
break;
case 'A':
// sweep flag needs to be inverted for the correct reverse path
reversed.push( (s.sweepFlag ? '0' : '1'), (s.largeArcFlag ? '1' : '0'), s.angle, s.r2, s.r1, 'A', y, x );
break;
default:
console.log('SVG path error: '+command);
}
}
var newpath = reversed.reverse();
var reversedString = 'M ' + newpath.join( ' ' );
path.setAttribute('d', reversedString);
}
}
// merge b into a, assuming the end of a coincides with the start of b
SvgParser.prototype.mergeOpenPaths = function(a, b){
var topath = function(svg, p){
if(p.tagName == 'line'){
var pa = svg.createElementNS('http://www.w3.org/2000/svg', 'path');
pa.pathSegList.appendItem(pa.createSVGPathSegMovetoAbs(Number(p.getAttribute('x1')),Number(p.getAttribute('y1'))));
pa.pathSegList.appendItem(pa.createSVGPathSegLinetoAbs(Number(p.getAttribute('x2')),Number(p.getAttribute('y2'))));
return pa;
}
if(p.tagName == 'polyline'){
if(p.points.length < 2){
return null;
}
pa = svg.createElementNS('http://www.w3.org/2000/svg', 'path');
pa.pathSegList.appendItem(pa.createSVGPathSegMovetoAbs(p.points[0].x,p.points[0].y));
for(var i=1; i<p.points.length; i++){
pa.pathSegList.appendItem(pa.createSVGPathSegLinetoAbs(p.points[i].x,p.points[i].y));
}
return pa;
}
return null;
}
var patha;
if(a.tagName == 'path'){
patha = a;
}
else{
patha = topath(this.svg, a);
}
var pathb;
if(b.tagName == 'path'){
pathb = b;
}
else{
pathb = topath(this.svg, b);
}
if(!patha || !pathb){
return null;
}
// merge b into a
var seglist = pathb.pathSegList;
// first item is M command
var m1 = seglist.getItem(0);
patha.pathSegList.appendItem(patha.createSVGPathSegLinetoAbs(m1.x,m1.y));
//seglist.removeItem(0);
for(var i=1; i<seglist.numberOfItems; i++){
patha.pathSegList.appendItem(seglist.getItem(i));
}
if(a.parentNode){
a.parentNode.removeChild(a);
}
if(b.parentNode){
b.parentNode.removeChild(b);
}
return patha;
}
SvgParser.prototype.isClosed = function(p, tolerance){
var openElements = ['line', 'polyline', 'path'];
if(openElements.indexOf(p.tagName) < 0){
// things like rect, circle etc are by definition closed shapes
return true;
}
if(p.tagName == 'line'){
return false;
}
if(p.tagName == 'polyline'){
if(p.points.length < 3){
return true;
}
var first = {
x: p.points[0].x,
y: p.points[0].y
};
var last = {
x: p.points[p.points.length-1].x,
y: p.points[p.points.length-1].y
};
if(GeometryUtil.almostEqual(first.x,last.x, tolerance || this.conf.toleranceSvg) && GeometryUtil.almostEqual(first.y,last.y, tolerance || this.conf.toleranceSvg)){
return true;
}
else{
return false;
}
// path can be closed if it touches itself at some point
/*for(var j=p.points.length-1; j>0; j--){
var current = p.points[j];
if(GeometryUtil.almostEqual(first.x,current.x, tolerance || this.conf.toleranceSvg) && GeometryUtil.almostEqual(first.y,current.y, tolerance || this.conf.toleranceSvg)){
return true;
}
}
return false;*/
}
if(p.tagName == 'path'){
for(var j=0; j<p.pathSegList.numberOfItems; j++){
var c = p.pathSegList.getItem(j);
if(c.pathSegTypeAsLetter == 'z' || c.pathSegTypeAsLetter == 'Z'){
return true;
}
}
// could still be "closed" if start and end coincide
var test = this.polygonifyPath(p);
if(!test){
return false;
}
if(test.length < 2){
return true;
}
var first = test[0];
var last = test[test.length-1];
if(GeometryUtil.almostEqualPoints(first, last, tolerance || this.conf.toleranceSvg)){
return true;
}
}
}
SvgParser.prototype.getEndpoints = function(p){
var start, end;
if(p.tagName == 'line'){
start = {
x: Number(p.getAttribute('x1')),
y: Number(p.getAttribute('y1'))
};
end = {
x: Number(p.getAttribute('x2')),
y: Number(p.getAttribute('y2'))
};
}
else if(p.tagName == 'polyline'){
if(p.points.length == 0){
return null;
}
start = {
x: p.points[0].x,
y: p.points[0].y
};
end = {
x: p.points[p.points.length-1].x,
y: p.points[p.points.length-1].y
};
}
else if(p.tagName == 'path'){
var poly = this.polygonifyPath(p);
if(!poly){
return null;
}
start = poly[0];
end = poly[poly.length-1];
}
else{
return null;
}
return {start: start, end: end};
}
// set the given path as absolute coords (capital commands)
// from http://stackoverflow.com/a/9677915/433888
SvgParser.prototype.pathToAbsolute = function(path){
if(!path || path.tagName != 'path'){
throw Error('invalid path');
}
var seglist = path.pathSegList;
var x=0, y=0, x0=0, y0=0, x1=0, y1=0, x2=0, y2=0;
for(var i=0; i<seglist.numberOfItems; i++){
var command = seglist.getItem(i).pathSegTypeAsLetter;
var s = seglist.getItem(i);
if (/[MLHVCSQTA]/.test(command)){
if ('x' in s) x=s.x;
if ('y' in s) y=s.y;
}
else{
if ('x1' in s) x1=x+s.x1;
if ('x2' in s) x2=x+s.x2;
if ('y1' in s) y1=y+s.y1;
if ('y2' in s) y2=y+s.y2;
if ('x' in s) x+=s.x;
if ('y' in s) y+=s.y;
switch(command){
case 'm': seglist.replaceItem(path.createSVGPathSegMovetoAbs(x,y),i); break;
case 'l': seglist.replaceItem(path.createSVGPathSegLinetoAbs(x,y),i); break;
case 'h': seglist.replaceItem(path.createSVGPathSegLinetoHorizontalAbs(x),i); break;
case 'v': seglist.replaceItem(path.createSVGPathSegLinetoVerticalAbs(y),i); break;
case 'c': seglist.replaceItem(path.createSVGPathSegCurvetoCubicAbs(x,y,x1,y1,x2,y2),i); break;
case 's': seglist.replaceItem(path.createSVGPathSegCurvetoCubicSmoothAbs(x,y,x2,y2),i); break;
case 'q': seglist.replaceItem(path.createSVGPathSegCurvetoQuadraticAbs(x,y,x1,y1),i); break;
case 't': seglist.replaceItem(path.createSVGPathSegCurvetoQuadraticSmoothAbs(x,y),i); break;
case 'a': seglist.replaceItem(path.createSVGPathSegArcAbs(x,y,s.r1,s.r2,s.angle,s.largeArcFlag,s.sweepFlag),i); break;
case 'z': case 'Z': x=x0; y=y0; break;
}
}
// Record the start of a subpath
if (command=='M' || command=='m') x0=x, y0=y;
}
};
// takes an SVG transform string and returns corresponding SVGMatrix
// from https://github.com/fontello/svgpath
SvgParser.prototype.transformParse = function(transformString){
var operations = {
matrix: true,
scale: true,
rotate: true,
translate: true,
skewX: true,
skewY: true
};
var CMD_SPLIT_RE = /\s*(matrix|translate|scale|rotate|skewX|skewY)\s*\(\s*(.+?)\s*\)[\s,]*/;
var PARAMS_SPLIT_RE = /[\s,]+/;
var matrix = new Matrix();
var cmd, params;
// Split value into ['', 'translate', '10 50', '', 'scale', '2', '', 'rotate', '-45', '']
transformString.split(CMD_SPLIT_RE).forEach(function (item) {
// Skip empty elements
if (!item.length) { return; }
// remember operation
if (typeof operations[item] !== 'undefined') {
cmd = item;
return;
}
// extract params & att operation to matrix
params = item.split(PARAMS_SPLIT_RE).map(function (i) {
return +i || 0;
});
// If params count is not correct - ignore command
switch (cmd) {
case 'matrix':
if (params.length === 6) {
matrix.matrix(params);
}
return;
case 'scale':
if (params.length === 1) {
matrix.scale(params[0], params[0]);
} else if (params.length === 2) {
matrix.scale(params[0], params[1]);
}
return;
case 'rotate':
if (params.length === 1) {
matrix.rotate(params[0], 0, 0);
} else if (params.length === 3) {
matrix.rotate(params[0], params[1], params[2]);
}
return;
case 'translate':
if (params.length === 1) {