/*
 * canvg.js - Javascript SVG parser and renderer on Canvas
 * MIT Licensed
 * Gabe Lerner (gabelerner@gmail.com)
 * http://code.google.com/p/canvg/
 *
 * Requires: rgbcolor.js - http://www.phpied.com/rgb-color-parser-in-javascript/
 */
(function(){
    // canvg(target, s)
    // empty parameters: replace all 'svg' elements on page with 'canvas' elements
    // target: canvas element or the id of a canvas element
    // s: svg string, url to svg file, or xml document
    // opts: optional hash of options
    //       ignoreMouse: true => ignore mouse events
    //       ignoreAnimation: true => ignore animations
    //       ignoreDimensions: true => does not try to resize canvas
    //       ignoreClear: true => does not clear canvas
    //       offsetX: int => draws at a x offset
    //       offsetY: int => draws at a y offset
    //       scaleWidth: int => scales horizontally to width
    //       scaleHeight: int => scales vertically to height
    //       renderCallback: function => will call the function after the first render is completed
    //       forceRedraw: function => will call the function on every frame, if it returns true, will redraw
    this.canvg = function (target, s, opts) {
        // no parameters
        if (target == null && s == null && opts == null) {
            var svgTags = document.querySelectorAll('svg');
            for (var i=0; i<svgTags.length; i++) {
                var svgTag = svgTags[i];
                var c = document.createElement('canvas');
                c.width = svgTag.clientWidth;
                c.height = svgTag.clientHeight;
                svgTag.parentNode.insertBefore(c, svgTag);
                svgTag.parentNode.removeChild(svgTag);
                var div = document.createElement('div');
                div.appendChild(svgTag);
                canvg(c, div.innerHTML);
            }
            return;
        }

        if (typeof target == 'string') {
            target = document.getElementById(target);
        }

        // store class on canvas
        if (target.svg != null) target.svg.stop();
        var svg = build(opts || {});
        // on i.e. 8 for flash canvas, we can't assign the property so check for it
        if (!(target.childNodes.length == 1 && target.childNodes[0].nodeName == 'OBJECT')) target.svg = svg;

        var ctx = target.getContext('2d');
        console.log("> "+s);
        if (typeof(s.documentElement) != 'undefined') {
            // load from xml doc
            svg.loadXmlDoc(ctx, s);
        }
        else if (s.substr(0,1) == '<') {
            // load from xml string
            svg.loadXml(ctx, s);
        }
        else {
            // load from url
            svg.load(ctx, s);
        }
    }

    function build(opts) {
        var svg = { opts: opts };

        svg.FRAMERATE = 30;
        svg.MAX_VIRTUAL_PIXELS = 30000;

        svg.log = function(msg) {};
        if (svg.opts['log'] == true && typeof(console) != 'undefined') {
            svg.log = function(msg) { console.log(msg); };
        };

        // globals
        svg.init = function(ctx) {
            var uniqueId = 0;
            svg.UniqueId = function () { uniqueId++; return 'canvg' + uniqueId; };
            svg.Definitions = {};
            svg.Styles = {};
            svg.Animations = [];
            svg.Images = [];
            svg.ctx = ctx;
            svg.ViewPort = new (function () {
                this.viewPorts = [];
                this.Clear = function() { this.viewPorts = []; }
                this.SetCurrent = function(width, height) { this.viewPorts.push({ width: width, height: height }); }
                this.RemoveCurrent = function() { this.viewPorts.pop(); }
                this.Current = function() { return this.viewPorts[this.viewPorts.length - 1]; }
                this.width = function() { return this.Current().width; }
                this.height = function() { return this.Current().height; }
                this.ComputeSize = function(d) {
                    if (d != null && typeof(d) == 'number') return d;
                    if (d == 'x') return this.width();
                    if (d == 'y') return this.height();
                    return Math.sqrt(Math.pow(this.width(), 2) + Math.pow(this.height(), 2)) / Math.sqrt(2);
                }
            });
        }
        svg.init();

        // images loaded
        svg.ImagesLoaded = function() {
            for (var i=0; i<svg.Images.length; i++) {
                if (!svg.Images[i].loaded) return false;
            }
            return true;
        }

        // trim
        svg.trim = function(s) { return s.replace(/^\s+|\s+$/g, ''); }

        // compress spaces
        svg.compressSpaces = function(s) { return s.replace(/[\s\r\t\n]+/gm,' '); }

        // ajax
        svg.ajax = function(url) {
            var AJAX;
            if(window.XMLHttpRequest){AJAX=new XMLHttpRequest();}
            else{AJAX=new ActiveXObject('Microsoft.XMLHTTP');}
            if(AJAX){
               AJAX.open('GET',url,false);
               AJAX.send(null);
               return AJAX.responseText;
            }
            return null;
        }

        // parse xml
        svg.parseXml = function(xml) {
            if (window.DOMParser)
            {
                var parser = new DOMParser();
                return parser.parseFromString(xml, 'text/xml');
            }
            else
            {
                xml = xml.replace(/<!DOCTYPE svg[^>]*>/, '');
                var xmlDoc = new ActiveXObject('Microsoft.XMLDOM');
                xmlDoc.async = 'false';
                xmlDoc.loadXML(xml);
                return xmlDoc;
            }
        }

        svg.Property = function(name, value) {
            this.name = name;
            this.value = value;
        }
            svg.Property.prototype.getValue = function() {
                return this.value;
            }

            svg.Property.prototype.hasValue = function() {
                return (this.value != null && this.value !== '');
            }

            // return the numerical value of the property
            svg.Property.prototype.numValue = function() {
                if (!this.hasValue()) return 0;

                var n = parseFloat(this.value);
                if ((this.value + '').match(/%$/)) {
                    n = n / 100.0;
                }
                return n;
            }

            svg.Property.prototype.valueOrDefault = function(def) {
                if (this.hasValue()) return this.value;
                return def;
            }

            svg.Property.prototype.numValueOrDefault = function(def) {
                if (this.hasValue()) return this.numValue();
                return def;
            }

            // color extensions
                // augment the current color value with the opacity
                svg.Property.prototype.addOpacity = function(opacity) {
                    var newValue = this.value;
                    if (opacity != null && opacity != '' && typeof(this.value)=='string') { // can only add opacity to colors, not patterns
                        var color = new RGBColor(this.value);
                        if (color.ok) {
                            newValue = 'rgba(' + color.r + ', ' + color.g + ', ' + color.b + ', ' + opacity + ')';
                        }
                    }
                    return new svg.Property(this.name, newValue);
                }

            // definition extensions
                // get the definition from the definitions table
                svg.Property.prototype.getDefinition = function() {
                    var name = this.value.match(/#([^\)'"]+)/);
                    if (name) { name = name[1]; }
                    if (!name) { name = this.value; }
                    return svg.Definitions[name];
                }

                svg.Property.prototype.isUrlDefinition = function() {
                    return this.value.indexOf('url(') == 0
                }

                svg.Property.prototype.getFillStyleDefinition = function(e, opacityProp) {
                    var def = this.getDefinition();

                    // gradient
                    if (def != null && def.createGradient) {
                        return def.createGradient(svg.ctx, e, opacityProp);
                    }

                    // pattern
                    if (def != null && def.createPattern) {
                        if (def.getHrefAttribute().hasValue()) {
                            var pt = def.attribute('patternTransform');
                            def = def.getHrefAttribute().getDefinition();
                            if (pt.hasValue()) { def.attribute('patternTransform', true).value = pt.value; }
                        }
                        return def.createPattern(svg.ctx, e);
                    }

                    return null;
                }

            // length extensions
                svg.Property.prototype.getDPI = function(viewPort) {
                    return 96.0; // TODO: compute?
                }

                svg.Property.prototype.getEM = function(viewPort) {
                    var em = 12;

                    var fontSize = new svg.Property('fontSize', svg.Font.Parse(svg.ctx.font).fontSize);
                    if (fontSize.hasValue()) em = fontSize.toPixels(viewPort);

                    return em;
                }

                svg.Property.prototype.getUnits = function() {
                    var s = this.value+'';
                    return s.replace(/[0-9\.\-]/g,'');
                }

                // get the length as pixels
                svg.Property.prototype.toPixels = function(viewPort, processPercent) {
                    if (!this.hasValue()) return 0;
                    var s = this.value+'';
                    if (s.match(/em$/)) return this.numValue() * this.getEM(viewPort);
                    if (s.match(/ex$/)) return this.numValue() * this.getEM(viewPort) / 2.0;
                    if (s.match(/px$/)) return this.numValue();
                    if (s.match(/pt$/)) return this.numValue() * this.getDPI(viewPort) * (1.0 / 72.0);
                    if (s.match(/pc$/)) return this.numValue() * 15;
                    if (s.match(/cm$/)) return this.numValue() * this.getDPI(viewPort) / 2.54;
                    if (s.match(/mm$/)) return this.numValue() * this.getDPI(viewPort) / 25.4;
                    if (s.match(/in$/)) return this.numValue() * this.getDPI(viewPort);
                    if (s.match(/%$/)) return this.numValue() * svg.ViewPort.ComputeSize(viewPort);
                    var n = this.numValue();
                    if (processPercent && n < 1.0) return n * svg.ViewPort.ComputeSize(viewPort);
                    return n;
                }

            // time extensions
                // get the time as milliseconds
                svg.Property.prototype.toMilliseconds = function() {
                    if (!this.hasValue()) return 0;
                    var s = this.value+'';
                    if (s.match(/s$/)) return this.numValue() * 1000;
                    if (s.match(/ms$/)) return this.numValue();
                    return this.numValue();
                }

            // angle extensions
                // get the angle as radians
                svg.Property.prototype.toRadians = function() {
                    if (!this.hasValue()) return 0;
                    var s = this.value+'';
                    if (s.match(/deg$/)) return this.numValue() * (Math.PI / 180.0);
                    if (s.match(/grad$/)) return this.numValue() * (Math.PI / 200.0);
                    if (s.match(/rad$/)) return this.numValue();
                    return this.numValue() * (Math.PI / 180.0);
                }

            // text extensions
                // get the text baseline
                var textBaselineMapping = {
                    'baseline': 'alphabetic',
                    'before-edge': 'top',
                    'text-before-edge': 'top',
                    'middle': 'middle',
                    'central': 'middle',
                    'after-edge': 'bottom',
                    'text-after-edge': 'bottom',
                    'ideographic': 'ideographic',
                    'alphabetic': 'alphabetic',
                    'hanging': 'hanging',
                    'mathematical': 'alphabetic'
                };
                svg.Property.prototype.toTextBaseline = function () {
                    if (!this.hasValue()) return null;
                    return textBaselineMapping[this.value];
                }

        // fonts
        svg.Font = new (function() {
            this.Styles = 'normal|italic|oblique|inherit';
            this.Variants = 'normal|small-caps|inherit';
            this.Weights = 'normal|bold|bolder|lighter|100|200|300|400|500|600|700|800|900|inherit';

            this.CreateFont = function(fontStyle, fontVariant, fontWeight, fontSize, fontFamily, inherit) {
                var f = inherit != null ? this.Parse(inherit) : this.CreateFont('', '', '', '', '', svg.ctx.font);
                return {
                    fontFamily: fontFamily || f.fontFamily,
                    fontSize: fontSize || f.fontSize,
                    fontStyle: fontStyle || f.fontStyle,
                    fontWeight: fontWeight || f.fontWeight,
                    fontVariant: fontVariant || f.fontVariant,
                    toString: function () { return [this.fontStyle, this.fontVariant, this.fontWeight, this.fontSize, this.fontFamily].join(' ') }
                }
            }

            var that = this;
            this.Parse = function(s) {
                var f = {};
                var d = svg.trim(svg.compressSpaces(s || '')).split(' ');
                var set = { fontSize: false, fontStyle: false, fontWeight: false, fontVariant: false }
                var ff = '';
                for (var i=0; i<d.length; i++) {
                    if (!set.fontStyle && that.Styles.indexOf(d[i]) != -1) { if (d[i] != 'inherit') f.fontStyle = d[i]; set.fontStyle = true; }
                    else if (!set.fontVariant && that.Variants.indexOf(d[i]) != -1) { if (d[i] != 'inherit') f.fontVariant = d[i]; set.fontStyle = set.fontVariant = true;  }
                    else if (!set.fontWeight && that.Weights.indexOf(d[i]) != -1) { if (d[i] != 'inherit') f.fontWeight = d[i]; set.fontStyle = set.fontVariant = set.fontWeight = true; }
                    else if (!set.fontSize) { if (d[i] != 'inherit') f.fontSize = d[i].split('/')[0]; set.fontStyle = set.fontVariant = set.fontWeight = set.fontSize = true; }
                    else { if (d[i] != 'inherit') ff += d[i]; }
                } if (ff != '') f.fontFamily = ff;
                return f;
            }
        });

        // points and paths
        svg.ToNumberArray = function(s) {
            var a = svg.trim(svg.compressSpaces((s || '').replace(/,/g, ' '))).split(' ');
            for (var i=0; i<a.length; i++) {
                a[i] = parseFloat(a[i]);
            }
            return a;
        }
        svg.Point = function(x, y) {
            this.x = x;
            this.y = y;
        }
            svg.Point.prototype.angleTo = function(p) {
                return Math.atan2(p.y - this.y, p.x - this.x);
            }

            svg.Point.prototype.applyTransform = function(v) {
                var xp = this.x * v[0] + this.y * v[2] + v[4];
                var yp = this.x * v[1] + this.y * v[3] + v[5];
                this.x = xp;
                this.y = yp;
            }

        svg.CreatePoint = function(s) {
            var a = svg.ToNumberArray(s);
            return new svg.Point(a[0], a[1]);
        }
        svg.CreatePath = function(s) {
            var a = svg.ToNumberArray(s);
            var path = [];
            for (var i=0; i<a.length; i+=2) {
                path.push(new svg.Point(a[i], a[i+1]));
            }
            return path;
        }

        // bounding box
        svg.BoundingBox = function(x1, y1, x2, y2) { // pass in initial points if you want
            this.x1 = Number.NaN;
            this.y1 = Number.NaN;
            this.x2 = Number.NaN;
            this.y2 = Number.NaN;

            this.x = function() { return this.x1; }
            this.y = function() { return this.y1; }
            this.width = function() { return this.x2 - this.x1; }
            this.height = function() { return this.y2 - this.y1; }

            this.addPoint = function(x, y) {
                if (x != null) {
                    if (isNaN(this.x1) || isNaN(this.x2)) {
                        this.x1 = x;
                        this.x2 = x;
                    }
                    if (x < this.x1) this.x1 = x;
                    if (x > this.x2) this.x2 = x;
                }

                if (y != null) {
                    if (isNaN(this.y1) || isNaN(this.y2)) {
                        this.y1 = y;
                        this.y2 = y;
                    }
                    if (y < this.y1) this.y1 = y;
                    if (y > this.y2) this.y2 = y;
                }
            }
            this.addX = function(x) { this.addPoint(x, null); }
            this.addY = function(y) { this.addPoint(null, y); }

            this.addBoundingBox = function(bb) {
                this.addPoint(bb.x1, bb.y1);
                this.addPoint(bb.x2, bb.y2);
            }

            this.addQuadraticCurve = function(p0x, p0y, p1x, p1y, p2x, p2y) {
                var cp1x = p0x + 2/3 * (p1x - p0x); // CP1 = QP0 + 2/3 *(QP1-QP0)
                var cp1y = p0y + 2/3 * (p1y - p0y); // CP1 = QP0 + 2/3 *(QP1-QP0)
                var cp2x = cp1x + 1/3 * (p2x - p0x); // CP2 = CP1 + 1/3 *(QP2-QP0)
                var cp2y = cp1y + 1/3 * (p2y - p0y); // CP2 = CP1 + 1/3 *(QP2-QP0)
                this.addBezierCurve(p0x, p0y, cp1x, cp2x, cp1y, cp2y, p2x, p2y);
            }

            this.addBezierCurve = function(p0x, p0y, p1x, p1y, p2x, p2y, p3x, p3y) {
                // from http://blog.hackers-cafe.net/2009/06/how-to-calculate-bezier-curves-bounding.html
                var p0 = [p0x, p0y], p1 = [p1x, p1y], p2 = [p2x, p2y], p3 = [p3x, p3y];
                this.addPoint(p0[0], p0[1]);
                this.addPoint(p3[0], p3[1]);

                for (i=0; i<=1; i++) {
                    var f = function(t) {
                        return Math.pow(1-t, 3) * p0[i]
                        + 3 * Math.pow(1-t, 2) * t * p1[i]
                        + 3 * (1-t) * Math.pow(t, 2) * p2[i]
                        + Math.pow(t, 3) * p3[i];
                    }

                    var b = 6 * p0[i] - 12 * p1[i] + 6 * p2[i];
                    var a = -3 * p0[i] + 9 * p1[i] - 9 * p2[i] + 3 * p3[i];
                    var c = 3 * p1[i] - 3 * p0[i];

                    if (a == 0) {
                        if (b == 0) continue;
                        var t = -c / b;
                        if (0 < t && t < 1) {
                            if (i == 0) this.addX(f(t));
                            if (i == 1) this.addY(f(t));
                        }
                        continue;
                    }

                    var b2ac = Math.pow(b, 2) - 4 * c * a;
                    if (b2ac < 0) continue;
                    var t1 = (-b + Math.sqrt(b2ac)) / (2 * a);
                    if (0 < t1 && t1 < 1) {
                        if (i == 0) this.addX(f(t1));
                        if (i == 1) this.addY(f(t1));
                    }
                    var t2 = (-b - Math.sqrt(b2ac)) / (2 * a);
                    if (0 < t2 && t2 < 1) {
                        if (i == 0) this.addX(f(t2));
                        if (i == 1) this.addY(f(t2));
                    }
                }
            }

            this.isPointInBox = function(x, y) {
                return (this.x1 <= x && x <= this.x2 && this.y1 <= y && y <= this.y2);
            }

            this.addPoint(x1, y1);
            this.addPoint(x2, y2);
        }

        // transforms
        svg.Transform = function(v) {
            var that = this;
            this.Type = {}

            // translate
            this.Type.translate = function(s) {
                this.p = svg.CreatePoint(s);
                this.apply = function(ctx) {
                    ctx.translate(this.p.x || 0.0, this.p.y || 0.0);
                }
                this.unapply = function(ctx) {
                    ctx.translate(-1.0 * this.p.x || 0.0, -1.0 * this.p.y || 0.0);
                }
                this.applyToPoint = function(p) {
                    p.applyTransform([1, 0, 0, 1, this.p.x || 0.0, this.p.y || 0.0]);
                }
            }

            // rotate
            this.Type.rotate = function(s) {
                var a = svg.ToNumberArray(s);
                this.angle = new svg.Property('angle', a[0]);
                this.cx = a[1] || 0;
                this.cy = a[2] || 0;
                this.apply = function(ctx) {
                    ctx.translate(this.cx, this.cy);
                    ctx.rotate(this.angle.toRadians());
                    ctx.translate(-this.cx, -this.cy);
                }
                this.unapply = function(ctx) {
                    ctx.translate(this.cx, this.cy);
                    ctx.rotate(-1.0 * this.angle.toRadians());
                    ctx.translate(-this.cx, -this.cy);
                }
                this.applyToPoint = function(p) {
                    var a = this.angle.toRadians();
                    p.applyTransform([1, 0, 0, 1, this.p.x || 0.0, this.p.y || 0.0]);
                    p.applyTransform([Math.cos(a), Math.sin(a), -Math.sin(a), Math.cos(a), 0, 0]);
                    p.applyTransform([1, 0, 0, 1, -this.p.x || 0.0, -this.p.y || 0.0]);
                }
            }

            this.Type.scale = function(s) {
                this.p = svg.CreatePoint(s);
                this.apply = function(ctx) {
                    ctx.scale(this.p.x || 1.0, this.p.y || this.p.x || 1.0);
                }
                this.unapply = function(ctx) {
                    ctx.scale(1.0 / this.p.x || 1.0, 1.0 / this.p.y || this.p.x || 1.0);
                }
                this.applyToPoint = function(p) {
                    p.applyTransform([this.p.x || 0.0, 0, 0, this.p.y || 0.0, 0, 0]);
                }
            }

            this.Type.matrix = function(s) {
                this.m = svg.ToNumberArray(s);
                this.apply = function(ctx) {
                    ctx.transform(this.m[0], this.m[1], this.m[2], this.m[3], this.m[4], this.m[5]);
                }
                this.applyToPoint = function(p) {
                    p.applyTransform(this.m);
                }
            }

            this.Type.SkewBase = function(s) {
                this.base = that.Type.matrix;
                this.base(s);
                this.angle = new svg.Property('angle', s);
            }
            this.Type.SkewBase.prototype = new this.Type.matrix;

            this.Type.skewX = function(s) {
                this.base = that.Type.SkewBase;
                this.base(s);
                this.m = [1, 0, Math.tan(this.angle.toRadians()), 1, 0, 0];
            }
            this.Type.skewX.prototype = new this.Type.SkewBase;

            this.Type.skewY = function(s) {
                this.base = that.Type.SkewBase;
                this.base(s);
                this.m = [1, Math.tan(this.angle.toRadians()), 0, 1, 0, 0];
            }
            this.Type.skewY.prototype = new this.Type.SkewBase;

            this.transforms = [];

            this.apply = function(ctx) {
                for (var i=0; i<this.transforms.length; i++) {
                    this.transforms[i].apply(ctx);
                }
            }

            this.unapply = function(ctx) {
                for (var i=this.transforms.length-1; i>=0; i--) {
                    this.transforms[i].unapply(ctx);
                }
            }

            this.applyToPoint = function(p) {
                for (var i=0; i<this.transforms.length; i++) {
                    this.transforms[i].applyToPoint(p);
                }
            }

            var data = svg.trim(svg.compressSpaces(v)).replace(/\)(\s?,\s?)/g,') ').split(/\s(?=[a-z])/);
            for (var i=0; i<data.length; i++) {
                var type = svg.trim(data[i].split('(')[0]);
                var s = data[i].split('(')[1].replace(')','');
                var transform = new this.Type[type](s);
                transform.type = type;
                this.transforms.push(transform);
            }
        }

        // aspect ratio
        svg.AspectRatio = function(ctx, aspectRatio, width, desiredWidth, height, desiredHeight, minX, minY, refX, refY) {
            // aspect ratio - http://www.w3.org/TR/SVG/coords.html#PreserveAspectRatioAttribute
            aspectRatio = svg.compressSpaces(aspectRatio);
            aspectRatio = aspectRatio.replace(/^defer\s/,''); // ignore defer
            var align = aspectRatio.split(' ')[0] || 'xMidYMid';
            var meetOrSlice = aspectRatio.split(' ')[1] || 'meet';

            // calculate scale
            var scaleX = width / desiredWidth;
            var scaleY = height / desiredHeight;
            var scaleMin = Math.min(scaleX, scaleY);
            var scaleMax = Math.max(scaleX, scaleY);
            if (meetOrSlice == 'meet') { desiredWidth *= scaleMin; desiredHeight *= scaleMin; }
            if (meetOrSlice == 'slice') { desiredWidth *= scaleMax; desiredHeight *= scaleMax; }

            refX = new svg.Property('refX', refX);
            refY = new svg.Property('refY', refY);
            if (refX.hasValue() && refY.hasValue()) {
                ctx.translate(-scaleMin * refX.toPixels('x'), -scaleMin * refY.toPixels('y'));
            }
            else {
                // align
                if (align.match(/^xMid/) && ((meetOrSlice == 'meet' && scaleMin == scaleY) || (meetOrSlice == 'slice' && scaleMax == scaleY))) ctx.translate(width / 2.0 - desiredWidth / 2.0, 0);
                if (align.match(/YMid$/) && ((meetOrSlice == 'meet' && scaleMin == scaleX) || (meetOrSlice == 'slice' && scaleMax == scaleX))) ctx.translate(0, height / 2.0 - desiredHeight / 2.0);
                if (align.match(/^xMax/) && ((meetOrSlice == 'meet' && scaleMin == scaleY) || (meetOrSlice == 'slice' && scaleMax == scaleY))) ctx.translate(width - desiredWidth, 0);
                if (align.match(/YMax$/) && ((meetOrSlice == 'meet' && scaleMin == scaleX) || (meetOrSlice == 'slice' && scaleMax == scaleX))) ctx.translate(0, height - desiredHeight);
            }

            // scale
            if (align == 'none') ctx.scale(scaleX, scaleY);
            else if (meetOrSlice == 'meet') ctx.scale(scaleMin, scaleMin);
            else if (meetOrSlice == 'slice') ctx.scale(scaleMax, scaleMax);

            // translate
            ctx.translate(minX == null ? 0 : -minX, minY == null ? 0 : -minY);
        }

        // elements
        svg.Element = {}

        svg.EmptyProperty = new svg.Property('EMPTY', '');

        svg.Element.ElementBase = function(node) {
            this.attributes = {};
            this.styles = {};
            this.children = [];

            // get or create attribute
            this.attribute = function(name, createIfNotExists) {
                var a = this.attributes[name];
                if (a != null) return a;

                if (createIfNotExists == true) { a = new svg.Property(name, ''); this.attributes[name] = a; }
                return a || svg.EmptyProperty;
            }

            this.getHrefAttribute = function() {
                for (var a in this.attributes) {
                    if (a.match(/:href$/)) {
                        return this.attributes[a];
                    }
                }
                return svg.EmptyProperty;
            }

            // get or create style, crawls up node tree
            this.style = function(name, createIfNotExists) {
                var s = this.styles[name];
                if (s != null) return s;

                var a = this.attribute(name);
                if (a != null && a.hasValue()) {
                    this.styles[name] = a; // move up to me to cache
                    return a;
                }

                var p = this.parent;
                if (p != null) {
                    var ps = p.style(name);
                    if (ps != null && ps.hasValue()) {
                        return ps;
                    }
                }

                if (createIfNotExists == true) { s = new svg.Property(name, ''); this.styles[name] = s; }
                return s || svg.EmptyProperty;
            }

            // base render
            this.render = function(ctx) {
                // don't render display=none
                if (this.style('display').value == 'none') return;

                // don't render visibility=hidden
                if (this.style('visibility').value == 'hidden') return;

                ctx.save();
                if (this.attribute('mask').hasValue()) { // mask
                    var mask = this.attribute('mask').getDefinition();
                    if (mask != null) mask.apply(ctx, this);
                }
                else if (this.style('filter').hasValue()) { // filter
                    var filter = this.style('filter').getDefinition();
                    if (filter != null) filter.apply(ctx, this);
                }
                else {
                    this.setContext(ctx);
                    this.renderChildren(ctx);
                    this.clearContext(ctx);
                }
                ctx.restore();
            }

            // base set context
            this.setContext = function(ctx) {
                // OVERRIDE ME!
            }

            // base clear context
            this.clearContext = function(ctx) {
                // OVERRIDE ME!
            }

            // base render children
            this.renderChildren = function(ctx) {
                for (var i=0; i<this.children.length; i++) {
                    this.children[i].render(ctx);
                }
            }

            this.addChild = function(childNode, create) {
                var child = childNode;
                if (create) child = svg.CreateElement(childNode);
                child.parent = this;
                this.children.push(child);
            }

            if (node != null && node.nodeType == 1) { //ELEMENT_NODE
                // add children
                for (var i=0; i<node.childNodes.length; i++) {
                    var childNode = node.childNodes[i];
                    if (childNode.nodeType == 1) this.addChild(childNode, true); //ELEMENT_NODE
                    if (this.captureTextNodes && childNode.nodeType == 3) {
                        var text = childNode.nodeValue || childNode.text || '';
                        if (svg.trim(svg.compressSpaces(text)) != '') {
                            this.addChild(new svg.Element.tspan(childNode), false); // TEXT_NODE
                        }
                    }
                }

                // add attributes
                for (var i=0; i<node.attributes.length; i++) {
                    var attribute = node.attributes[i];
                    this.attributes[attribute.nodeName] = new svg.Property(attribute.nodeName, attribute.nodeValue);
                }

                // add tag styles
                var styles = svg.Styles[node.nodeName];
                if (styles != null) {
                    for (var name in styles) {
                        this.styles[name] = styles[name];
                    }
                }

                // add class styles
                if (this.attribute('class').hasValue()) {
                    var classes = svg.compressSpaces(this.attribute('class').value).split(' ');
                    for (var j=0; j<classes.length; j++) {
                        styles = svg.Styles['.'+classes[j]];
                        if (styles != null) {
                            for (var name in styles) {
                                this.styles[name] = styles[name];
                            }
                        }
                        styles = svg.Styles[node.nodeName+'.'+classes[j]];
                        if (styles != null) {
                            for (var name in styles) {
                                this.styles[name] = styles[name];
                            }
                        }
                    }
                }

                // add id styles
                if (this.attribute('id').hasValue()) {
                    var styles = svg.Styles['#' + this.attribute('id').value];
                    if (styles != null) {
                        for (var name in styles) {
                            this.styles[name] = styles[name];
                        }
                    }
                }

                // add inline styles
                if (this.attribute('style').hasValue()) {
                    var styles = this.attribute('style').value.split(';');
                    for (var i=0; i<styles.length; i++) {
                        if (svg.trim(styles[i]) != '') {
                            var style = styles[i].split(':');
                            var name = svg.trim(style[0]);
                            var value = svg.trim(style[1]);
                            this.styles[name] = new svg.Property(name, value);
                        }
                    }
                }

                // add id
                if (this.attribute('id').hasValue()) {
                    if (svg.Definitions[this.attribute('id').value] == null) {
                        svg.Definitions[this.attribute('id').value] = this;
                    }
                }
            }
        }

        svg.Element.RenderedElementBase = function(node) {
            this.base = svg.Element.ElementBase;
            this.base(node);

            this.setContext = function(ctx) {
                // fill
                if (this.style('fill').isUrlDefinition()) {
                    var fs = this.style('fill').getFillStyleDefinition(this, this.style('fill-opacity'));
                    if (fs != null) ctx.fillStyle = fs;
                }
                else if (this.style('fill').hasValue()) {
                    var fillStyle = this.style('fill');
                    if (fillStyle.value == 'currentColor') fillStyle.value = this.style('color').value;
                    ctx.fillStyle = (fillStyle.value == 'none' ? 'rgba(0,0,0,0)' : fillStyle.value);
                }
                if (this.style('fill-opacity').hasValue()) {
                    var fillStyle = new svg.Property('fill', ctx.fillStyle);
                    fillStyle = fillStyle.addOpacity(this.style('fill-opacity').value);
                    ctx.fillStyle = fillStyle.value;
                }

                // stroke
                if (this.style('stroke').isUrlDefinition()) {
                    var fs = this.style('stroke').getFillStyleDefinition(this, this.style('stroke-opacity'));
                    if (fs != null) ctx.strokeStyle = fs;
                }
                else if (this.style('stroke').hasValue()) {
                    var strokeStyle = this.style('stroke');
                    if (strokeStyle.value == 'currentColor') strokeStyle.value = this.style('color').value;
                    ctx.strokeStyle = (strokeStyle.value == 'none' ? 'rgba(0,0,0,0)' : strokeStyle.value);
                }
                if (this.style('stroke-opacity').hasValue()) {
                    var strokeStyle = new svg.Property('stroke', ctx.strokeStyle);
                    strokeStyle = strokeStyle.addOpacity(this.style('stroke-opacity').value);
                    ctx.strokeStyle = strokeStyle.value;
                }
                if (this.style('stroke-width').hasValue()) {
                    var newLineWidth = this.style('stroke-width').toPixels();
                    ctx.lineWidth = newLineWidth == 0 ? 0.001 : newLineWidth; // browsers don't respect 0
                }
                if (this.style('stroke-linecap').hasValue()) ctx.lineCap = this.style('stroke-linecap').value;
                if (this.style('stroke-linejoin').hasValue()) ctx.lineJoin = this.style('stroke-linejoin').value;
                if (this.style('stroke-miterlimit').hasValue()) ctx.miterLimit = this.style('stroke-miterlimit').value;
                if (this.style('stroke-dasharray').hasValue() && this.style('stroke-dasharray').value != 'none') {
                    var gaps = svg.ToNumberArray(this.style('stroke-dasharray').value);
                    if (typeof(ctx.setLineDash) != 'undefined') { ctx.setLineDash(gaps); }
                    else if (typeof(ctx.webkitLineDash) != 'undefined') { ctx.webkitLineDash = gaps; }
                    else if (typeof(ctx.mozDash ) != 'undefined') { ctx.mozDash  = gaps; }

                    var offset = this.style('stroke-dashoffset').numValueOrDefault(1);
                    if (typeof(ctx.lineDashOffset) != 'undefined') { ctx.lineDashOffset = offset; }
                    else if (typeof(ctx.webkitLineDashOffset) != 'undefined') { ctx.webkitLineDashOffset = offset; }
                    else if (typeof(ctx.mozDashOffset) != 'undefined') { ctx.mozDashOffset = offset; }
                }

                // font
                if (typeof(ctx.font) != 'undefined') {
                    ctx.font = svg.Font.CreateFont(
                        this.style('font-style').value,
                        this.style('font-variant').value,
                        this.style('font-weight').value,
                        this.style('font-size').hasValue() ? this.style('font-size').toPixels() + 'px' : '',
                        this.style('font-family').value).toString();
                }

                // transform
                if (this.attribute('transform').hasValue()) {
                    var transform = new svg.Transform(this.attribute('transform').value);
                    transform.apply(ctx);
                }

                // clip
                if (this.style('clip-path').hasValue()) {
                    var clip = this.style('clip-path').getDefinition();
                    if (clip != null) clip.apply(ctx);
                }

                // opacity
                if (this.style('opacity').hasValue()) {
                    ctx.globalAlpha = this.style('opacity').numValue();
                }
            }
        }
        svg.Element.RenderedElementBase.prototype = new svg.Element.ElementBase;

        svg.Element.PathElementBase = function(node) {
            this.base = svg.Element.RenderedElementBase;
            this.base(node);

            this.path = function(ctx) {
                if (ctx != null) ctx.beginPath();
                return new svg.BoundingBox();
            }

            this.renderChildren = function(ctx) {
                this.path(ctx);
                svg.Mouse.checkPath(this, ctx);
                if (ctx.fillStyle != '') {
                    if (this.attribute('fill-rule').valueOrDefault('inherit') != 'inherit') { ctx.fill(this.attribute('fill-rule').value); }
                    else { ctx.fill(); }
                }
                if (ctx.strokeStyle != '') ctx.stroke();

                var markers = this.getMarkers();
                if (markers != null) {
                    if (this.style('marker-start').isUrlDefinition()) {
                        var marker = this.style('marker-start').getDefinition();
                        marker.render(ctx, markers[0][0], markers[0][1]);
                    }
                    if (this.style('marker-mid').isUrlDefinition()) {
                        var marker = this.style('marker-mid').getDefinition();
                        for (var i=1;i<markers.length-1;i++) {
                            marker.render(ctx, markers[i][0], markers[i][1]);
                        }
                    }
                    if (this.style('marker-end').isUrlDefinition()) {
                        var marker = this.style('marker-end').getDefinition();
                        marker.render(ctx, markers[markers.length-1][0], markers[markers.length-1][1]);
                    }
                }
            }

            this.getBoundingBox = function() {
                return this.path();
            }

            this.getMarkers = function() {
                return null;
            }
        }
        svg.Element.PathElementBase.prototype = new svg.Element.RenderedElementBase;

        // svg element
        svg.Element.svg = function(node) {
            this.base = svg.Element.RenderedElementBase;
            this.base(node);

            this.baseClearContext = this.clearContext;
            this.clearContext = function(ctx) {
                this.baseClearContext(ctx);
                svg.ViewPort.RemoveCurrent();
            }

            this.baseSetContext = this.setContext;
            this.setContext = function(ctx) {
                // initial values and defaults
                ctx.strokeStyle = 'rgba(0,0,0,0)';
                ctx.lineCap = 'butt';
                ctx.lineJoin = 'miter';
                ctx.miterLimit = 4;
                if (typeof(ctx.font) != 'undefined' && typeof(window.getComputedStyle) != 'undefined') {
                    ctx.font = window.getComputedStyle(ctx.canvas).getPropertyValue('font');
                }

                this.baseSetContext(ctx);

                // create new view port
                if (!this.attribute('x').hasValue()) this.attribute('x', true).value = 0;
                if (!this.attribute('y').hasValue()) this.attribute('y', true).value = 0;
                ctx.translate(this.attribute('x').toPixels('x'), this.attribute('y').toPixels('y'));

                var width = svg.ViewPort.width();
                var height = svg.ViewPort.height();

                if (!this.attribute('width').hasValue()) this.attribute('width', true).value = '100%';
                if (!this.attribute('height').hasValue()) this.attribute('height', true).value = '100%';
                if (typeof(this.root) == 'undefined') {
                    width = this.attribute('width').toPixels('x');
                    height = this.attribute('height').toPixels('y');

                    var x = 0;
                    var y = 0;
                    if (this.attribute('refX').hasValue() && this.attribute('refY').hasValue()) {
                        x = -this.attribute('refX').toPixels('x');
                        y = -this.attribute('refY').toPixels('y');
                    }

                    if (this.attribute('overflow').valueOrDefault('hidden') != 'visible') {
                        ctx.beginPath();
                        ctx.moveTo(x, y);
                        ctx.lineTo(width, y);
                        ctx.lineTo(width, height);
                        ctx.lineTo(x, height);
                        ctx.closePath();
                        ctx.clip();
                    }
                }
                svg.ViewPort.SetCurrent(width, height);

                // viewbox
                if (this.attribute('viewBox').hasValue()) {
                    var viewBox = svg.ToNumberArray(this.attribute('viewBox').value);
                    var minX = viewBox[0];
                    var minY = viewBox[1];
                    width = viewBox[2];
                    height = viewBox[3];

                    svg.AspectRatio(ctx,
                                    this.attribute('preserveAspectRatio').value,
                                    svg.ViewPort.width(),
                                    width,
                                    svg.ViewPort.height(),
                                    height,
                                    minX,
                                    minY,
                                    this.attribute('refX').value,
                                    this.attribute('refY').value);

                    svg.ViewPort.RemoveCurrent();
                    svg.ViewPort.SetCurrent(viewBox[2], viewBox[3]);
                }
            }
        }
        svg.Element.svg.prototype = new svg.Element.RenderedElementBase;

        // rect element
        svg.Element.rect = function(node) {
            this.base = svg.Element.PathElementBase;
            this.base(node);

            this.path = function(ctx) {
                var x = this.attribute('x').toPixels('x');
                var y = this.attribute('y').toPixels('y');
                var width = this.attribute('width').toPixels('x');
                var height = this.attribute('height').toPixels('y');
                var rx = this.attribute('rx').toPixels('x');
                var ry = this.attribute('ry').toPixels('y');
                if (this.attribute('rx').hasValue() && !this.attribute('ry').hasValue()) ry = rx;
                if (this.attribute('ry').hasValue() && !this.attribute('rx').hasValue()) rx = ry;
                rx = Math.min(rx, width / 2.0);
                ry = Math.min(ry, height / 2.0);
                if (ctx != null) {
                    ctx.beginPath();
                    ctx.moveTo(x + rx, y);
                    ctx.lineTo(x + width - rx, y);
                    ctx.quadraticCurveTo(x + width, y, x + width, y + ry)
                    ctx.lineTo(x + width, y + height - ry);
                    ctx.quadraticCurveTo(x + width, y + height, x + width - rx, y + height)
                    ctx.lineTo(x + rx, y + height);
                    ctx.quadraticCurveTo(x, y + height, x, y + height - ry)
                    ctx.lineTo(x, y + ry);
                    ctx.quadraticCurveTo(x, y, x + rx, y)
                    ctx.closePath();
                }

                return new svg.BoundingBox(x, y, x + width, y + height);
            }
        }
        svg.Element.rect.prototype = new svg.Element.PathElementBase;

        // circle element
        svg.Element.circle = function(node) {
            this.base = svg.Element.PathElementBase;
            this.base(node);

            this.path = function(ctx) {
                var cx = this.attribute('cx').toPixels('x');
                var cy = this.attribute('cy').toPixels('y');
                var r = this.attribute('r').toPixels();

                if (ctx != null) {
                    ctx.beginPath();
                    ctx.arc(cx, cy, r, 0, Math.PI * 2, true);
                    ctx.closePath();
                }

                return new svg.BoundingBox(cx - r, cy - r, cx + r, cy + r);
            }
        }
        svg.Element.circle.prototype = new svg.Element.PathElementBase;

        // ellipse element
        svg.Element.ellipse = function(node) {
            this.base = svg.Element.PathElementBase;
            this.base(node);

            this.path = function(ctx) {
                var KAPPA = 4 * ((Math.sqrt(2) - 1) / 3);
                var rx = this.attribute('rx').toPixels('x');
                var ry = this.attribute('ry').toPixels('y');
                var cx = this.attribute('cx').toPixels('x');
                var cy = this.attribute('cy').toPixels('y');

                if (ctx != null) {
                    ctx.beginPath();
                    ctx.moveTo(cx, cy - ry);
                    ctx.bezierCurveTo(cx + (KAPPA * rx), cy - ry,  cx + rx, cy - (KAPPA * ry), cx + rx, cy);
                    ctx.bezierCurveTo(cx + rx, cy + (KAPPA * ry), cx + (KAPPA * rx), cy + ry, cx, cy + ry);
                    ctx.bezierCurveTo(cx - (KAPPA * rx), cy + ry, cx - rx, cy + (KAPPA * ry), cx - rx, cy);
                    ctx.bezierCurveTo(cx - rx, cy - (KAPPA * ry), cx - (KAPPA * rx), cy - ry, cx, cy - ry);
                    ctx.closePath();
                }

                return new svg.BoundingBox(cx - rx, cy - ry, cx + rx, cy + ry);
            }
        }
        svg.Element.ellipse.prototype = new svg.Element.PathElementBase;

        // line element
        svg.Element.line = function(node) {
            this.base = svg.Element.PathElementBase;
            this.base(node);

            this.getPoints = function() {
                return [
                    new svg.Point(this.attribute('x1').toPixels('x'), this.attribute('y1').toPixels('y')),
                    new svg.Point(this.attribute('x2').toPixels('x'), this.attribute('y2').toPixels('y'))];
            }

            this.path = function(ctx) {
                var points = this.getPoints();

                if (ctx != null) {
                    ctx.beginPath();
                    ctx.moveTo(points[0].x, points[0].y);
                    ctx.lineTo(points[1].x, points[1].y);
                }

                return new svg.BoundingBox(points[0].x, points[0].y, points[1].x, points[1].y);
            }

            this.getMarkers = function() {
                var points = this.getPoints();
                var a = points[0].angleTo(points[1]);
                return [[points[0], a], [points[1], a]];
            }
        }
        svg.Element.line.prototype = new svg.Element.PathElementBase;

        // polyline element
        svg.Element.polyline = function(node) {
            this.base = svg.Element.PathElementBase;
            this.base(node);

            this.points = svg.CreatePath(this.attribute('points').value);
            this.path = function(ctx) {
                var bb = new svg.BoundingBox(this.points[0].x, this.points[0].y);
                if (ctx != null) {
                    ctx.beginPath();
                    ctx.moveTo(this.points[0].x, this.points[0].y);
                }
                for (var i=1; i<this.points.length; i++) {
                    bb.addPoint(this.points[i].x, this.points[i].y);
                    if (ctx != null) ctx.lineTo(this.points[i].x, this.points[i].y);
                }
                return bb;
            }

            this.getMarkers = function() {
                var markers = [];
                for (var i=0; i<this.points.length - 1; i++) {
                    markers.push([this.points[i], this.points[i].angleTo(this.points[i+1])]);
                }
                markers.push([this.points[this.points.length-1], markers[markers.length-1][1]]);
                return markers;
            }
        }
        svg.Element.polyline.prototype = new svg.Element.PathElementBase;

        // polygon element
        svg.Element.polygon = function(node) {
            this.base = svg.Element.polyline;
            this.base(node);

            this.basePath = this.path;
            this.path = function(ctx) {
                var bb = this.basePath(ctx);
                if (ctx != null) {
                    ctx.lineTo(this.points[0].x, this.points[0].y);
                    ctx.closePath();
                }
                return bb;
            }
        }
        svg.Element.polygon.prototype = new svg.Element.polyline;

        // path element
        svg.Element.path = function(node) {
            this.base = svg.Element.PathElementBase;
            this.base(node);

            var d = this.attribute('d').value;
            // TODO: convert to real lexer based on http://www.w3.org/TR/SVG11/paths.html#PathDataBNF
            d = d.replace(/,/gm,' '); // get rid of all commas
            d = d.replace(/([MmZzLlHhVvCcSsQqTtAa])([MmZzLlHhVvCcSsQqTtAa])/gm,'$1 $2'); // separate commands from commands
            d = d.replace(/([MmZzLlHhVvCcSsQqTtAa])([MmZzLlHhVvCcSsQqTtAa])/gm,'$1 $2'); // separate commands from commands
            d = d.replace(/([MmZzLlHhVvCcSsQqTtAa])([^\s])/gm,'$1 $2'); // separate commands from points
            d = d.replace(/([^\s])([MmZzLlHhVvCcSsQqTtAa])/gm,'$1 $2'); // separate commands from points
            d = d.replace(/([0-9])([+\-])/gm,'$1 $2'); // separate digits when no comma
            d = d.replace(/(\.[0-9]*)(\.)/gm,'$1 $2'); // separate digits when no comma
            d = d.replace(/([Aa](\s+[0-9]+){3})\s+([01])\s*([01])/gm,'$1 $3 $4 '); // shorthand elliptical arc path syntax
            d = svg.compressSpaces(d); // compress multiple spaces
            d = svg.trim(d);
            this.PathParser = new (function(d) {
                this.tokens = d.split(' ');

                this.reset = function() {
                    this.i = -1;
                    this.command = '';
                    this.previousCommand = '';
                    this.start = new svg.Point(0, 0);
                    this.control = new svg.Point(0, 0);
                    this.current = new svg.Point(0, 0);
                    this.points = [];
                    this.angles = [];
                }

                this.isEnd = function() {
                    return this.i >= this.tokens.length - 1;
                }

                this.isCommandOrEnd = function() {
                    if (this.isEnd()) return true;
                    return this.tokens[this.i + 1].match(/^[A-Za-z]$/) != null;
                }

                this.isRelativeCommand = function() {
                    switch(this.command)
                    {
                        case 'm':
                        case 'l':
                        case 'h':
                        case 'v':
                        case 'c':
                        case 's':
                        case 'q':
                        case 't':
                        case 'a':
                        case 'z':
                            return true;
                            break;
                    }
                    return false;
                }

                this.getToken = function() {
                    this.i++;
                    return this.tokens[this.i];
                }

                this.getScalar = function() {
                    return parseFloat(this.getToken());
                }

                this.nextCommand = function() {
                    this.previousCommand = this.command;
                    this.command = this.getToken();
                }

                this.getPoint = function() {
                    var p = new svg.Point(this.getScalar(), this.getScalar());
                    return this.makeAbsolute(p);
                }

                this.getAsControlPoint = function() {
                    var p = this.getPoint();
                    this.control = p;
                    return p;
                }

                this.getAsCurrentPoint = function() {
                    var p = this.getPoint();
                    this.current = p;
                    return p;
                }

                this.getReflectedControlPoint = function() {
                    if (this.previousCommand.toLowerCase() != 'c' &&
                        this.previousCommand.toLowerCase() != 's' &&
                        this.previousCommand.toLowerCase() != 'q' &&
                        this.previousCommand.toLowerCase() != 't' ){
                        return this.current;
                    }

                    // reflect point
                    var p = new svg.Point(2 * this.current.x - this.control.x, 2 * this.current.y - this.control.y);
                    return p;
                }

                this.makeAbsolute = function(p) {
                    if (this.isRelativeCommand()) {
                        p.x += this.current.x;
                        p.y += this.current.y;
                    }
                    return p;
                }

                this.addMarker = function(p, from, priorTo) {
                    // if the last angle isn't filled in because we didn't have this point yet ...
                    if (priorTo != null && this.angles.length > 0 && this.angles[this.angles.length-1] == null) {
                        this.angles[this.angles.length-1] = this.points[this.points.length-1].angleTo(priorTo);
                    }
                    this.addMarkerAngle(p, from == null ? null : from.angleTo(p));
                }

                this.addMarkerAngle = function(p, a) {
                    this.points.push(p);
                    this.angles.push(a);
                }

                this.getMarkerPoints = function() { return this.points; }
                this.getMarkerAngles = function() {
                    for (var i=0; i<this.angles.length; i++) {
                        if (this.angles[i] == null) {
                            for (var j=i+1; j<this.angles.length; j++) {
                                if (this.angles[j] != null) {
                                    this.angles[i] = this.angles[j];
                                    break;
                                }
                            }
                        }
                    }
                    return this.angles;
                }
            })(d);

            this.path = function(ctx) {
                var pp = this.PathParser;
                pp.reset();

                var bb = new svg.BoundingBox();
                if (ctx != null) ctx.beginPath();
                while (!pp.isEnd()) {
                    pp.nextCommand();
                    switch (pp.command) {
                    case 'M':
                    case 'm':
                        var p = pp.getAsCurrentPoint();
                        pp.addMarker(p);
                        bb.addPoint(p.x, p.y);
                        if (ctx != null) ctx.moveTo(p.x, p.y);
                        pp.start = pp.current;
                        while (!pp.isCommandOrEnd()) {
                            var p = pp.getAsCurrentPoint();
                            pp.addMarker(p, pp.start);
                            bb.addPoint(p.x, p.y);
                            if (ctx != null) ctx.lineTo(p.x, p.y);
                        }
                        break;
                    case 'L':
                    case 'l':
                        while (!pp.isCommandOrEnd()) {
                            var c = pp.current;
                            var p = pp.getAsCurrentPoint();
                            pp.addMarker(p, c);
                            bb.addPoint(p.x, p.y);
                            if (ctx != null) ctx.lineTo(p.x, p.y);
                        }
                        break;
                    case 'H':
                    case 'h':
                        while (!pp.isCommandOrEnd()) {
                            var newP = new svg.Point((pp.isRelativeCommand() ? pp.current.x : 0) + pp.getScalar(), pp.current.y);
                            pp.addMarker(newP, pp.current);
                            pp.current = newP;
                            bb.addPoint(pp.current.x, pp.current.y);
                            if (ctx != null) ctx.lineTo(pp.current.x, pp.current.y);
                        }
                        break;
                    case 'V':
                    case 'v':
                        while (!pp.isCommandOrEnd()) {
                            var newP = new svg.Point(pp.current.x, (pp.isRelativeCommand() ? pp.current.y : 0) + pp.getScalar());
                            pp.addMarker(newP, pp.current);
                            pp.current = newP;
                            bb.addPoint(pp.current.x, pp.current.y);
                            if (ctx != null) ctx.lineTo(pp.current.x, pp.current.y);
                        }
                        break;
                    case 'C':
                    case 'c':
                        while (!pp.isCommandOrEnd()) {
                            var curr = pp.current;
                            var p1 = pp.getPoint();
                            var cntrl = pp.getAsControlPoint();
                            var cp = pp.getAsCurrentPoint();
                            pp.addMarker(cp, cntrl, p1);
                            bb.addBezierCurve(curr.x, curr.y, p1.x, p1.y, cntrl.x, cntrl.y, cp.x, cp.y);
                            if (ctx != null) ctx.bezierCurveTo(p1.x, p1.y, cntrl.x, cntrl.y, cp.x, cp.y);
                        }
                        break;
                    case 'S':
                    case 's':
                        while (!pp.isCommandOrEnd()) {
                            var curr = pp.current;
                            var p1 = pp.getReflectedControlPoint();
                            var cntrl = pp.getAsControlPoint();
                            var cp = pp.getAsCurrentPoint();
                            pp.addMarker(cp, cntrl, p1);
                            bb.addBezierCurve(curr.x, curr.y, p1.x, p1.y, cntrl.x, cntrl.y, cp.x, cp.y);
                            if (ctx != null) ctx.bezierCurveTo(p1.x, p1.y, cntrl.x, cntrl.y, cp.x, cp.y);
                        }
                        break;
                    case 'Q':
                    case 'q':
                        while (!pp.isCommandOrEnd()) {
                            var curr = pp.current;
                            var cntrl = pp.getAsControlPoint();
                            var cp = pp.getAsCurrentPoint();
                            pp.addMarker(cp, cntrl, cntrl);
                            bb.addQuadraticCurve(curr.x, curr.y, cntrl.x, cntrl.y, cp.x, cp.y);
                            if (ctx != null) ctx.quadraticCurveTo(cntrl.x, cntrl.y, cp.x, cp.y);
                        }
                        break;
                    case 'T':
                    case 't':
                        while (!pp.isCommandOrEnd()) {
                            var curr = pp.current;
                            var cntrl = pp.getReflectedControlPoint();
                            pp.control = cntrl;
                            var cp = pp.getAsCurrentPoint();
                            pp.addMarker(cp, cntrl, cntrl);
                            bb.addQuadraticCurve(curr.x, curr.y, cntrl.x, cntrl.y, cp.x, cp.y);
                            if (ctx != null) ctx.quadraticCurveTo(cntrl.x, cntrl.y, cp.x, cp.y);
                        }
                        break;
                    case 'A':
                    case 'a':
                        while (!pp.isCommandOrEnd()) {
                            var curr = pp.current;
                            var rx = pp.getScalar();
                            var ry = pp.getScalar();
                            var xAxisRotation = pp.getScalar() * (Math.PI / 180.0);
                            var largeArcFlag = pp.getScalar();
                            var sweepFlag = pp.getScalar();
                            var cp = pp.getAsCurrentPoint();

                            // Conversion from endpoint to center parameterization
                            // http://www.w3.org/TR/SVG11/implnote.html#ArcImplementationNotes
                            // x1', y1'
                            var currp = new svg.Point(
                                Math.cos(xAxisRotation) * (curr.x - cp.x) / 2.0 + Math.sin(xAxisRotation) * (curr.y - cp.y) / 2.0,
                                -Math.sin(xAxisRotation) * (curr.x - cp.x) / 2.0 + Math.cos(xAxisRotation) * (curr.y - cp.y) / 2.0
                            );
                            // adjust radii
                            var l = Math.pow(currp.x,2)/Math.pow(rx,2)+Math.pow(currp.y,2)/Math.pow(ry,2);
                            if (l > 1) {
                                rx *= Math.sqrt(l);
                                ry *= Math.sqrt(l);
                            }
                            // cx', cy'
                            var s = (largeArcFlag == sweepFlag ? -1 : 1) * Math.sqrt(
                                ((Math.pow(rx,2)*Math.pow(ry,2))-(Math.pow(rx,2)*Math.pow(currp.y,2))-(Math.pow(ry,2)*Math.pow(currp.x,2))) /
                                (Math.pow(rx,2)*Math.pow(currp.y,2)+Math.pow(ry,2)*Math.pow(currp.x,2))
                            );
                            if (isNaN(s)) s = 0;
                            var cpp = new svg.Point(s * rx * currp.y / ry, s * -ry * currp.x / rx);
                            // cx, cy
                            var centp = new svg.Point(
                                (curr.x + cp.x) / 2.0 + Math.cos(xAxisRotation) * cpp.x - Math.sin(xAxisRotation) * cpp.y,
                                (curr.y + cp.y) / 2.0 + Math.sin(xAxisRotation) * cpp.x + Math.cos(xAxisRotation) * cpp.y
                            );
                            // vector magnitude
                            var m = function(v) { return Math.sqrt(Math.pow(v[0],2) + Math.pow(v[1],2)); }
                            // ratio between two vectors
                            var r = function(u, v) { return (u[0]*v[0]+u[1]*v[1]) / (m(u)*m(v)) }
                            // angle between two vectors
                            var a = function(u, v) { return (u[0]*v[1] < u[1]*v[0] ? -1 : 1) * Math.acos(r(u,v)); }
                            // initial angle
                            var a1 = a([1,0], [(currp.x-cpp.x)/rx,(currp.y-cpp.y)/ry]);
                            // angle delta
                            var u = [(currp.x-cpp.x)/rx,(currp.y-cpp.y)/ry];
                            var v = [(-currp.x-cpp.x)/rx,(-currp.y-cpp.y)/ry];
                            var ad = a(u, v);
                            if (r(u,v) <= -1) ad = Math.PI;
                            if (r(u,v) >= 1) ad = 0;

                            // for markers
                            var dir = 1 - sweepFlag ? 1.0 : -1.0;
                            var ah = a1 + dir * (ad / 2.0);
                            var halfWay = new svg.Point(
                                centp.x + rx * Math.cos(ah),
                                centp.y + ry * Math.sin(ah)
                            );
                            pp.addMarkerAngle(halfWay, ah - dir * Math.PI / 2);
                            pp.addMarkerAngle(cp, ah - dir * Math.PI);

                            bb.addPoint(cp.x, cp.y); // TODO: this is too naive, make it better
                            if (ctx != null) {
                                var r = rx > ry ? rx : ry;
                                var sx = rx > ry ? 1 : rx / ry;
                                var sy = rx > ry ? ry / rx : 1;

                                ctx.translate(centp.x, centp.y);
                                ctx.rotate(xAxisRotation);
                                ctx.scale(sx, sy);
                                ctx.arc(0, 0, r, a1, a1 + ad, 1 - sweepFlag);
                                ctx.scale(1/sx, 1/sy);
                                ctx.rotate(-xAxisRotation);
                                ctx.translate(-centp.x, -centp.y);
                            }
                        }
                        break;
                    case 'Z':
                    case 'z':
                        if (ctx != null) ctx.closePath();
                        pp.current = pp.start;
                    }
                }

                return bb;
            }

            this.getMarkers = function() {
                var points = this.PathParser.getMarkerPoints();
                var angles = this.PathParser.getMarkerAngles();

                var markers = [];
                for (var i=0; i<points.length; i++) {
                    markers.push([points[i], angles[i]]);
                }
                return markers;
            }
        }
        svg.Element.path.prototype = new svg.Element.PathElementBase;

        // pattern element
        svg.Element.pattern = function(node) {
            this.base = svg.Element.ElementBase;
            this.base(node);

            this.createPattern = function(ctx, element) {
                var width = this.attribute('width').toPixels('x', true);
                var height = this.attribute('height').toPixels('y', true);

                // render me using a temporary svg element
                var tempSvg = new svg.Element.svg();
                tempSvg.attributes['viewBox'] = new svg.Property('viewBox', this.attribute('viewBox').value);
                tempSvg.attributes['width'] = new svg.Property('width', width + 'px');
                tempSvg.attributes['height'] = new svg.Property('height', height + 'px');
                tempSvg.attributes['transform'] = new svg.Property('transform', this.attribute('patternTransform').value);
                tempSvg.children = this.children;

                var c = document.createElement('canvas');
                c.width = width;
                c.height = height;
                var cctx = c.getContext('2d');
                if (this.attribute('x').hasValue() && this.attribute('y').hasValue()) {
                    cctx.translate(this.attribute('x').toPixels('x', true), this.attribute('y').toPixels('y', true));
                }
                // render 3x3 grid so when we transform there's no white space on edges
                for (var x=-1; x<=1; x++) {
                    for (var y=-1; y<=1; y++) {
                        cctx.save();
                        cctx.translate(x * c.width, y * c.height);
                        tempSvg.render(cctx);
                        cctx.restore();
                    }
                }
                var pattern = ctx.createPattern(c, 'repeat');
                return pattern;
            }
        }
        svg.Element.pattern.prototype = new svg.Element.ElementBase;

        // marker element
        svg.Element.marker = function(node) {
            this.base = svg.Element.ElementBase;
            this.base(node);

            this.baseRender = this.render;
            this.render = function(ctx, point, angle) {
                ctx.translate(point.x, point.y);
                if (this.attribute('orient').valueOrDefault('auto') == 'auto') ctx.rotate(angle);
                if (this.attribute('markerUnits').valueOrDefault('strokeWidth') == 'strokeWidth') ctx.scale(ctx.lineWidth, ctx.lineWidth);
                ctx.save();

                // render me using a temporary svg element
                var tempSvg = new svg.Element.svg();
                tempSvg.attributes['viewBox'] = new svg.Property('viewBox', this.attribute('viewBox').value);
                tempSvg.attributes['refX'] = new svg.Property('refX', this.attribute('refX').value);
                tempSvg.attributes['refY'] = new svg.Property('refY', this.attribute('refY').value);
                tempSvg.attributes['width'] = new svg.Property('width', this.attribute('markerWidth').value);
                tempSvg.attributes['height'] = new svg.Property('height', this.attribute('markerHeight').value);
                tempSvg.attributes['fill'] = new svg.Property('fill', this.attribute('fill').valueOrDefault('black'));
                tempSvg.attributes['stroke'] = new svg.Property('stroke', this.attribute('stroke').valueOrDefault('none'));
                tempSvg.children = this.children;
                tempSvg.render(ctx);

                ctx.restore();
                if (this.attribute('markerUnits').valueOrDefault('strokeWidth') == 'strokeWidth') ctx.scale(1/ctx.lineWidth, 1/ctx.lineWidth);
                if (this.attribute('orient').valueOrDefault('auto') == 'auto') ctx.rotate(-angle);
                ctx.translate(-point.x, -point.y);
            }
        }
        svg.Element.marker.prototype = new svg.Element.ElementBase;

        // definitions element
        svg.Element.defs = function(node) {
            this.base = svg.Element.ElementBase;
            this.base(node);

            this.render = function(ctx) {
                // NOOP
            }
        }
        svg.Element.defs.prototype = new svg.Element.ElementBase;

        // base for gradients
        svg.Element.GradientBase = function(node) {
            this.base = svg.Element.ElementBase;
            this.base(node);

            this.gradientUnits = this.attribute('gradientUnits').valueOrDefault('objectBoundingBox');

            this.stops = [];
            for (var i=0; i<this.children.length; i++) {
                var child = this.children[i];
                if (child.type == 'stop') this.stops.push(child);
            }

            this.getGradient = function() {
                // OVERRIDE ME!
            }

            this.createGradient = function(ctx, element, parentOpacityProp) {
                var stopsContainer = this;
                if (this.getHrefAttribute().hasValue()) {
                    stopsContainer = this.getHrefAttribute().getDefinition();
                }

                var addParentOpacity = function (color) {
                    if (parentOpacityProp.hasValue()) {
                        var p = new svg.Property('color', color);
                        return p.addOpacity(parentOpacityProp.value).value;
                    }
                    return color;
                };

                var g = this.getGradient(ctx, element);
                if (g == null) return addParentOpacity(stopsContainer.stops[stopsContainer.stops.length - 1].color);
                for (var i=0; i<stopsContainer.stops.length; i++) {
                    g.addColorStop(stopsContainer.stops[i].offset, addParentOpacity(stopsContainer.stops[i].color));
                }

                if (this.attribute('gradientTransform').hasValue()) {
                    // render as transformed pattern on temporary canvas
                    var rootView = svg.ViewPort.viewPorts[0];

                    var rect = new svg.Element.rect();
                    rect.attributes['x'] = new svg.Property('x', -svg.MAX_VIRTUAL_PIXELS/3.0);
                    rect.attributes['y'] = new svg.Property('y', -svg.MAX_VIRTUAL_PIXELS/3.0);
                    rect.attributes['width'] = new svg.Property('width', svg.MAX_VIRTUAL_PIXELS);
                    rect.attributes['height'] = new svg.Property('height', svg.MAX_VIRTUAL_PIXELS);

                    var group = new svg.Element.g();
                    group.attributes['transform'] = new svg.Property('transform', this.attribute('gradientTransform').value);
                    group.children = [ rect ];

                    var tempSvg = new svg.Element.svg();
                    tempSvg.attributes['x'] = new svg.Property('x', 0);
                    tempSvg.attributes['y'] = new svg.Property('y', 0);
                    tempSvg.attributes['width'] = new svg.Property('width', rootView.width);
                    tempSvg.attributes['height'] = new svg.Property('height', rootView.height);
                    tempSvg.children = [ group ];

                    var c = document.createElement('canvas');
                    c.width = rootView.width;
                    c.height = rootView.height;
                    var tempCtx = c.getContext('2d');
                    tempCtx.fillStyle = g;
                    tempSvg.render(tempCtx);
                    return tempCtx.createPattern(c, 'no-repeat');
                }

                return g;
            }
        }
        svg.Element.GradientBase.prototype = new svg.Element.ElementBase;

        // linear gradient element
        svg.Element.linearGradient = function(node) {
            this.base = svg.Element.GradientBase;
            this.base(node);

            this.getGradient = function(ctx, element) {
                var bb = this.gradientUnits == 'objectBoundingBox' ? element.getBoundingBox() : null;

                if (!this.attribute('x1').hasValue()
                 && !this.attribute('y1').hasValue()
                 && !this.attribute('x2').hasValue()
                 && !this.attribute('y2').hasValue()) {
                    this.attribute('x1', true).value = 0;
                    this.attribute('y1', true).value = 0;
                    this.attribute('x2', true).value = 1;
                    this.attribute('y2', true).value = 0;
                 }

                var x1 = (this.gradientUnits == 'objectBoundingBox'
                    ? bb.x() + bb.width() * this.attribute('x1').numValue()
                    : this.attribute('x1').toPixels('x'));
                var y1 = (this.gradientUnits == 'objectBoundingBox'
                    ? bb.y() + bb.height() * this.attribute('y1').numValue()
                    : this.attribute('y1').toPixels('y'));
                var x2 = (this.gradientUnits == 'objectBoundingBox'
                    ? bb.x() + bb.width() * this.attribute('x2').numValue()
                    : this.attribute('x2').toPixels('x'));
                var y2 = (this.gradientUnits == 'objectBoundingBox'
                    ? bb.y() + bb.height() * this.attribute('y2').numValue()
                    : this.attribute('y2').toPixels('y'));

                if (x1 == x2 && y1 == y2) return null;
                return ctx.createLinearGradient(x1, y1, x2, y2);
            }
        }
        svg.Element.linearGradient.prototype = new svg.Element.GradientBase;

        // radial gradient element
        svg.Element.radialGradient = function(node) {
            this.base = svg.Element.GradientBase;
            this.base(node);

            this.getGradient = function(ctx, element) {
                var bb = element.getBoundingBox();

                if (!this.attribute('cx').hasValue()) this.attribute('cx', true).value = '50%';
                if (!this.attribute('cy').hasValue()) this.attribute('cy', true).value = '50%';
                if (!this.attribute('r').hasValue()) this.attribute('r', true).value = '50%';

                var cx = (this.gradientUnits == 'objectBoundingBox'
                    ? bb.x() + bb.width() * this.attribute('cx').numValue()
                    : this.attribute('cx').toPixels('x'));
                var cy = (this.gradientUnits == 'objectBoundingBox'
                    ? bb.y() + bb.height() * this.attribute('cy').numValue()
                    : this.attribute('cy').toPixels('y'));

                var fx = cx;
                var fy = cy;
                if (this.attribute('fx').hasValue()) {
                    fx = (this.gradientUnits == 'objectBoundingBox'
                    ? bb.x() + bb.width() * this.attribute('fx').numValue()
                    : this.attribute('fx').toPixels('x'));
                }
                if (this.attribute('fy').hasValue()) {
                    fy = (this.gradientUnits == 'objectBoundingBox'
                    ? bb.y() + bb.height() * this.attribute('fy').numValue()
                    : this.attribute('fy').toPixels('y'));
                }

                var r = (this.gradientUnits == 'objectBoundingBox'
                    ? (bb.width() + bb.height()) / 2.0 * this.attribute('r').numValue()
                    : this.attribute('r').toPixels());

                return ctx.createRadialGradient(fx, fy, 0, cx, cy, r);
            }
        }
        svg.Element.radialGradient.prototype = new svg.Element.GradientBase;

        // gradient stop element
        svg.Element.stop = function(node) {
            this.base = svg.Element.ElementBase;
            this.base(node);

            this.offset = this.attribute('offset').numValue();
            if (this.offset < 0) this.offset = 0;
            if (this.offset > 1) this.offset = 1;

            var stopColor = this.style('stop-color');
            if (this.style('stop-opacity').hasValue()) stopColor = stopColor.addOpacity(this.style('stop-opacity').value);
            this.color = stopColor.value;
        }
        svg.Element.stop.prototype = new svg.Element.ElementBase;

        // animation base element
        svg.Element.AnimateBase = function(node) {
            this.base = svg.Element.ElementBase;
            this.base(node);

            svg.Animations.push(this);

            this.duration = 0.0;
            this.begin = this.attribute('begin').toMilliseconds();
            this.maxDuration = this.begin + this.attribute('dur').toMilliseconds();

            this.getProperty = function() {
                var attributeType = this.attribute('attributeType').value;
                var attributeName = this.attribute('attributeName').value;

                if (attributeType == 'CSS') {
                    return this.parent.style(attributeName, true);
                }
                return this.parent.attribute(attributeName, true);
            };

            this.initialValue = null;
            this.initialUnits = '';
            this.removed = false;

            this.calcValue = function() {
                // OVERRIDE ME!
                return '';
            }

            this.update = function(delta) {
                // set initial value
                if (this.initialValue == null) {
                    this.initialValue = this.getProperty().value;
                    this.initialUnits = this.getProperty().getUnits();
                }

                // if we're past the end time
                if (this.duration > this.maxDuration) {
                    // loop for indefinitely repeating animations
                    if (this.attribute('repeatCount').value == 'indefinite'
                     || this.attribute('repeatDur').value == 'indefinite') {
                        this.duration = 0.0
                    }
                    else if (this.attribute('fill').valueOrDefault('remove') == 'remove' && !this.removed) {
                        this.removed = true;
                        this.getProperty().value = this.initialValue;
                        return true;
                    }
                    else {
                        return false; // no updates made
                    }
                }
                this.duration = this.duration + delta;

                // if we're past the begin time
                var updated = false;
                if (this.begin < this.duration) {
                    var newValue = this.calcValue(); // tween

                    if (this.attribute('type').hasValue()) {
                        // for transform, etc.
                        var type = this.attribute('type').value;
                        newValue = type + '(' + newValue + ')';
                    }

                    this.getProperty().value = newValue;
                    updated = true;
                }

                return updated;
            }

            this.from = this.attribute('from');
            this.to = this.attribute('to');
            this.values = this.attribute('values');
            if (this.values.hasValue()) this.values.value = this.values.value.split(';');

            // fraction of duration we've covered
            this.progress = function() {
                var ret = { progress: (this.duration - this.begin) / (this.maxDuration - this.begin) };
                if (this.values.hasValue()) {
                    var p = ret.progress * (this.values.value.length - 1);
                    var lb = Math.floor(p), ub = Math.ceil(p);
                    ret.from = new svg.Property('from', parseFloat(this.values.value[lb]));
                    ret.to = new svg.Property('to', parseFloat(this.values.value[ub]));
                    ret.progress = (p - lb) / (ub - lb);
                }
                else {
                    ret.from = this.from;
                    ret.to = this.to;
                }
                return ret;
            }
        }
        svg.Element.AnimateBase.prototype = new svg.Element.ElementBase;

        // animate element
        svg.Element.animate = function(node) {
            this.base = svg.Element.AnimateBase;
            this.base(node);

            this.calcValue = function() {
                var p = this.progress();

                // tween value linearly
                var newValue = p.from.numValue() + (p.to.numValue() - p.from.numValue()) * p.progress;
                return newValue + this.initialUnits;
            };
        }
        svg.Element.animate.prototype = new svg.Element.AnimateBase;

        // animate color element
        svg.Element.animateColor = function(node) {
            this.base = svg.Element.AnimateBase;
            this.base(node);

            this.calcValue = function() {
                var p = this.progress();
                var from = new RGBColor(p.from.value);
                var to = new RGBColor(p.to.value);

                if (from.ok && to.ok) {
                    // tween color linearly
                    var r = from.r + (to.r - from.r) * p.progress;
                    var g = from.g + (to.g - from.g) * p.progress;
                    var b = from.b + (to.b - from.b) * p.progress;
                    return 'rgb('+parseInt(r,10)+','+parseInt(g,10)+','+parseInt(b,10)+')';
                }
                return this.attribute('from').value;
            };
        }
        svg.Element.animateColor.prototype = new svg.Element.AnimateBase;

        // animate transform element
        svg.Element.animateTransform = function(node) {
            this.base = svg.Element.AnimateBase;
            this.base(node);

            this.calcValue = function() {
                var p = this.progress();

                // tween value linearly
                var from = svg.ToNumberArray(p.from.value);
                var to = svg.ToNumberArray(p.to.value);
                var newValue = '';
                for (var i=0; i<from.length; i++) {
                    newValue += from[i] + (to[i] - from[i]) * p.progress + ' ';
                }
                return newValue;
            };
        }
        svg.Element.animateTransform.prototype = new svg.Element.animate;

        // font element
        svg.Element.font = function(node) {
            this.base = svg.Element.ElementBase;
            this.base(node);

            this.horizAdvX = this.attribute('horiz-adv-x').numValue();

            this.isRTL = false;
            this.isArabic = false;
            this.fontFace = null;
            this.missingGlyph = null;
            this.glyphs = [];
            for (var i=0; i<this.children.length; i++) {
                var child = this.children[i];
                if (child.type == 'font-face') {
                    this.fontFace = child;
                    if (child.style('font-family').hasValue()) {
                        svg.Definitions[child.style('font-family').value] = this;
                    }
                }
                else if (child.type == 'missing-glyph') this.missingGlyph = child;
                else if (child.type == 'glyph') {
                    if (child.arabicForm != '') {
                        this.isRTL = true;
                        this.isArabic = true;
                        if (typeof(this.glyphs[child.unicode]) == 'undefined') this.glyphs[child.unicode] = [];
                        this.glyphs[child.unicode][child.arabicForm] = child;
                    }
                    else {
                        this.glyphs[child.unicode] = child;
                    }
                }
            }
        }
        svg.Element.font.prototype = new svg.Element.ElementBase;

        // font-face element
        svg.Element.fontface = function(node) {
            this.base = svg.Element.ElementBase;
            this.base(node);

            this.ascent = this.attribute('ascent').value;
            this.descent = this.attribute('descent').value;
            this.unitsPerEm = this.attribute('units-per-em').numValue();
        }
        svg.Element.fontface.prototype = new svg.Element.ElementBase;

        // missing-glyph element
        svg.Element.missingglyph = function(node) {
            this.base = svg.Element.path;
            this.base(node);

            this.horizAdvX = 0;
        }
        svg.Element.missingglyph.prototype = new svg.Element.path;

        // glyph element
        svg.Element.glyph = function(node) {
            this.base = svg.Element.path;
            this.base(node);

            this.horizAdvX = this.attribute('horiz-adv-x').numValue();
            this.unicode = this.attribute('unicode').value;
            this.arabicForm = this.attribute('arabic-form').value;
        }
        svg.Element.glyph.prototype = new svg.Element.path;

        // text element
        svg.Element.text = function(node) {
            this.captureTextNodes = true;
            this.base = svg.Element.RenderedElementBase;
            this.base(node);

            this.baseSetContext = this.setContext;
            this.setContext = function(ctx) {
                this.baseSetContext(ctx);

                var textBaseline = this.style('dominant-baseline').toTextBaseline();
                if (textBaseline == null) textBaseline = this.style('alignment-baseline').toTextBaseline();
                if (textBaseline != null) ctx.textBaseline = textBaseline;
            }

            this.getBoundingBox = function () {
                var x = this.attribute('x').toPixels('x');
                var y = this.attribute('y').toPixels('y');
                var fontSize = this.parent.style('font-size').numValueOrDefault(svg.Font.Parse(svg.ctx.font).fontSize);
                return new svg.BoundingBox(x, y - fontSize, x + Math.floor(fontSize * 2.0 / 3.0) * this.children[0].getText().length, y);
            }

            this.renderChildren = function(ctx) {
                this.x = this.attribute('x').toPixels('x');
                this.y = this.attribute('y').toPixels('y');
                this.x += this.getAnchorDelta(ctx, this, 0);
                for (var i=0; i<this.children.length; i++) {
                    this.renderChild(ctx, this, i);
                }
            }

            this.getAnchorDelta = function (ctx, parent, startI) {
                var textAnchor = this.style('text-anchor').valueOrDefault('start');
                if (textAnchor != 'start') {
                    var width = 0;
                    for (var i=startI; i<parent.children.length; i++) {
                        var child = parent.children[i];
                        if (i > startI && child.attribute('x').hasValue()) break; // new group
                        width += child.measureTextRecursive(ctx);
                    }
                    return -1 * (textAnchor == 'end' ? width : width / 2.0);
                }
                return 0;
            }

            this.renderChild = function(ctx, parent, i) {
                var child = parent.children[i];
                if (child.attribute('x').hasValue()) {
                    child.x = child.attribute('x').toPixels('x') + this.getAnchorDelta(ctx, parent, i);
                }
                else {
                    if (this.attribute('dx').hasValue()) this.x += this.attribute('dx').toPixels('x');
                    if (child.attribute('dx').hasValue()) this.x += child.attribute('dx').toPixels('x');
                    child.x = this.x;
                }
                this.x = child.x + child.measureText(ctx);

                if (child.attribute('y').hasValue()) {
                    child.y = child.attribute('y').toPixels('y');
                }
                else {
                    if (this.attribute('dy').hasValue()) this.y += this.attribute('dy').toPixels('y');
                    if (child.attribute('dy').hasValue()) this.y += child.attribute('dy').toPixels('y');
                    child.y = this.y;
                }
                this.y = child.y;

                child.render(ctx);

                for (var i=0; i<child.children.length; i++) {
                    this.renderChild(ctx, child, i);
                }
            }
        }
        svg.Element.text.prototype = new svg.Element.RenderedElementBase;

        // text base
        svg.Element.TextElementBase = function(node) {
            this.base = svg.Element.RenderedElementBase;
            this.base(node);

            this.getGlyph = function(font, text, i) {
                var c = text[i];
                var glyph = null;
                if (font.isArabic) {
                    var arabicForm = 'isolated';
                    if ((i==0 || text[i-1]==' ') && i<text.length-2 && text[i+1]!=' ') arabicForm = 'terminal';
                    if (i>0 && text[i-1]!=' ' && i<text.length-2 && text[i+1]!=' ') arabicForm = 'medial';
                    if (i>0 && text[i-1]!=' ' && (i == text.length-1 || text[i+1]==' ')) arabicForm = 'initial';
                    if (typeof(font.glyphs[c]) != 'undefined') {
                        glyph = font.glyphs[c][arabicForm];
                        if (glyph == null && font.glyphs[c].type == 'glyph') glyph = font.glyphs[c];
                    }
                }
                else {
                    glyph = font.glyphs[c];
                }
                if (glyph == null) glyph = font.missingGlyph;
                return glyph;
            }

            this.renderChildren = function(ctx) {
                var customFont = this.parent.style('font-family').getDefinition();
                if (customFont != null) {
                    var fontSize = this.parent.style('font-size').numValueOrDefault(svg.Font.Parse(svg.ctx.font).fontSize);
                    var fontStyle = this.parent.style('font-style').valueOrDefault(svg.Font.Parse(svg.ctx.font).fontStyle);
                    var text = this.getText();
                    if (customFont.isRTL) text = text.split("").reverse().join("");

                    var dx = svg.ToNumberArray(this.parent.attribute('dx').value);
                    for (var i=0; i<text.length; i++) {
                        var glyph = this.getGlyph(customFont, text, i);
                        var scale = fontSize / customFont.fontFace.unitsPerEm;
                        ctx.translate(this.x, this.y);
                        ctx.scale(scale, -scale);
                        var lw = ctx.lineWidth;
                        ctx.lineWidth = ctx.lineWidth * customFont.fontFace.unitsPerEm / fontSize;
                        if (fontStyle == 'italic') ctx.transform(1, 0, .4, 1, 0, 0);
                        glyph.render(ctx);
                        if (fontStyle == 'italic') ctx.transform(1, 0, -.4, 1, 0, 0);
                        ctx.lineWidth = lw;
                        ctx.scale(1/scale, -1/scale);
                        ctx.translate(-this.x, -this.y);

                        this.x += fontSize * (glyph.horizAdvX || customFont.horizAdvX) / customFont.fontFace.unitsPerEm;
                        if (typeof(dx[i]) != 'undefined' && !isNaN(dx[i])) {
                            this.x += dx[i];
                        }
                    }
                    return;
                }

                if (ctx.fillStyle != '') ctx.fillText(svg.compressSpaces(this.getText()), this.x, this.y);
                if (ctx.strokeStyle != '') ctx.strokeText(svg.compressSpaces(this.getText()), this.x, this.y);
            }

            this.getText = function() {
                // OVERRIDE ME
            }

            this.measureTextRecursive = function(ctx) {
                var width = this.measureText(ctx);
                for (var i=0; i<this.children.length; i++) {
                    width += this.children[i].measureTextRecursive(ctx);
                }
                return width;
            }

            this.measureText = function(ctx) {
                var customFont = this.parent.style('font-family').getDefinition();
                if (customFont != null) {
                    var fontSize = this.parent.style('font-size').numValueOrDefault(svg.Font.Parse(svg.ctx.font).fontSize);
                    var measure = 0;
                    var text = this.getText();
                    if (customFont.isRTL) text = text.split("").reverse().join("");
                    var dx = svg.ToNumberArray(this.parent.attribute('dx').value);
                    for (var i=0; i<text.length; i++) {
                        var glyph = this.getGlyph(customFont, text, i);
                        measure += (glyph.horizAdvX || customFont.horizAdvX) * fontSize / customFont.fontFace.unitsPerEm;
                        if (typeof(dx[i]) != 'undefined' && !isNaN(dx[i])) {
                            measure += dx[i];
                        }
                    }
                    return measure;
                }

                var textToMeasure = svg.compressSpaces(this.getText());
                if (!ctx.measureText) return textToMeasure.length * 10;

                ctx.save();
                this.setContext(ctx);
                var width = ctx.measureText(textToMeasure).width;
                ctx.restore();
                return width;
            }
        }
        svg.Element.TextElementBase.prototype = new svg.Element.RenderedElementBase;

        // tspan
        svg.Element.tspan = function(node) {
            this.captureTextNodes = true;
            this.base = svg.Element.TextElementBase;
            this.base(node);

            this.text = node.nodeValue || node.text || '';
            this.getText = function() {
                return this.text;
            }
        }
        svg.Element.tspan.prototype = new svg.Element.TextElementBase;

        // tref
        svg.Element.tref = function(node) {
            this.base = svg.Element.TextElementBase;
            this.base(node);

            this.getText = function() {
                var element = this.getHrefAttribute().getDefinition();
                if (element != null) return element.children[0].getText();
            }
        }
        svg.Element.tref.prototype = new svg.Element.TextElementBase;

        // a element
        svg.Element.a = function(node) {
            this.base = svg.Element.TextElementBase;
            this.base(node);

            this.hasText = true;
            for (var i=0; i<node.childNodes.length; i++) {
                if (node.childNodes[i].nodeType != 3) this.hasText = false;
            }

            // this might contain text
            this.text = this.hasText ? node.childNodes[0].nodeValue : '';
            this.getText = function() {
                return this.text;
            }

            this.baseRenderChildren = this.renderChildren;
            this.renderChildren = function(ctx) {
                if (this.hasText) {
                    // render as text element
                    this.baseRenderChildren(ctx);
                    var fontSize = new svg.Property('fontSize', svg.Font.Parse(svg.ctx.font).fontSize);
                    svg.Mouse.checkBoundingBox(this, new svg.BoundingBox(this.x, this.y - fontSize.toPixels('y'), this.x + this.measureText(ctx), this.y));
                }
                else {
                    // render as temporary group
                    var g = new svg.Element.g();
                    g.children = this.children;
                    g.parent = this;
                    g.render(ctx);
                }
            }

            this.onclick = function() {
                window.open(this.getHrefAttribute().value);
            }

            this.onmousemove = function() {
                svg.ctx.canvas.style.cursor = 'pointer';
            }
        }
        svg.Element.a.prototype = new svg.Element.TextElementBase;

        // image element
        svg.Element.image = function(node) {
            this.base = svg.Element.RenderedElementBase;
            this.base(node);

            var href = this.getHrefAttribute().value;
            var isSvg = href.match(/\.svg$/)

            svg.Images.push(this);
            this.loaded = false;
            if (!isSvg) {
                this.img = document.createElement('img');
                if (svg.opts['useCORS'] == true) { this.img.crossOrigin = 'Anonymous'; }
                var self = this;
                this.img.onload = function() { self.loaded = true; }
                this.img.onerror = function() { svg.log('ERROR: image "' + href + '" not found'); self.loaded = true; }
                this.img.src = href;
            }
            else {
                this.img = svg.ajax(href);
                this.loaded = true;
            }

            this.renderChildren = function(ctx) {
                var x = this.attribute('x').toPixels('x');
                var y = this.attribute('y').toPixels('y');

                var width = this.attribute('width').toPixels('x');
                var height = this.attribute('height').toPixels('y');
                if (width == 0 || height == 0) return;

                ctx.save();
                if (isSvg) {
                    ctx.drawSvg(this.img, x, y, width, height);
                }
                else {
                    ctx.translate(x, y);
                    svg.AspectRatio(ctx,
                                    this.attribute('preserveAspectRatio').value,
                                    width,
                                    this.img.width,
                                    height,
                                    this.img.height,
                                    0,
                                    0);
                    ctx.drawImage(this.img, 0, 0);
                }
                ctx.restore();
            }

            this.getBoundingBox = function() {
                var x = this.attribute('x').toPixels('x');
                var y = this.attribute('y').toPixels('y');
                var width = this.attribute('width').toPixels('x');
                var height = this.attribute('height').toPixels('y');
                return new svg.BoundingBox(x, y, x + width, y + height);
            }
        }
        svg.Element.image.prototype = new svg.Element.RenderedElementBase;

        // group element
        svg.Element.g = function(node) {
            this.base = svg.Element.RenderedElementBase;
            this.base(node);

            this.getBoundingBox = function() {
                var bb = new svg.BoundingBox();
                for (var i=0; i<this.children.length; i++) {
                    bb.addBoundingBox(this.children[i].getBoundingBox());
                }
                return bb;
            };
        }
        svg.Element.g.prototype = new svg.Element.RenderedElementBase;

        // symbol element
        svg.Element.symbol = function(node) {
            this.base = svg.Element.RenderedElementBase;
            this.base(node);

            this.render = function(ctx) {
                // NO RENDER
            };
        }
        svg.Element.symbol.prototype = new svg.Element.RenderedElementBase;

        // style element
        svg.Element.style = function(node) {
            this.base = svg.Element.ElementBase;
            this.base(node);

            // text, or spaces then CDATA
            var css = ''
            for (var i=0; i<node.childNodes.length; i++) {
              css += node.childNodes[i].nodeValue;
            }
            css = css.replace(/(\/\*([^*]|[\r\n]|(\*+([^*\/]|[\r\n])))*\*+\/)|(^[\s]*\/\/.*)/gm, ''); // remove comments
            css = svg.compressSpaces(css); // replace whitespace
            var cssDefs = css.split('}');
            for (var i=0; i<cssDefs.length; i++) {
                if (svg.trim(cssDefs[i]) != '') {
                    var cssDef = cssDefs[i].split('{');
                    var cssClasses = cssDef[0].split(',');
                    var cssProps = cssDef[1].split(';');
                    for (var j=0; j<cssClasses.length; j++) {
                        var cssClass = svg.trim(cssClasses[j]);
                        if (cssClass != '') {
                            var props = {};
                            for (var k=0; k<cssProps.length; k++) {
                                var prop = cssProps[k].indexOf(':');
                                var name = cssProps[k].substr(0, prop);
                                var value = cssProps[k].substr(prop + 1, cssProps[k].length - prop);
                                if (name != null && value != null) {
                                    props[svg.trim(name)] = new svg.Property(svg.trim(name), svg.trim(value));
                                }
                            }
                            svg.Styles[cssClass] = props;
                            if (cssClass == '@font-face') {
                                var fontFamily = props['font-family'].value.replace(/"/g,'');
                                var srcs = props['src'].value.split(',');
                                for (var s=0; s<srcs.length; s++) {
                                    if (srcs[s].indexOf('format("svg")') > 0) {
                                        var urlStart = srcs[s].indexOf('url');
                                        var urlEnd = srcs[s].indexOf(')', urlStart);
                                        var url = srcs[s].substr(urlStart + 5, urlEnd - urlStart - 6);
                                        var doc = svg.parseXml(svg.ajax(url));
                                        var fonts = doc.getElementsByTagName('font');
                                        for (var f=0; f<fonts.length; f++) {
                                            var font = svg.CreateElement(fonts[f]);
                                            svg.Definitions[fontFamily] = font;
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
        svg.Element.style.prototype = new svg.Element.ElementBase;

        // use element
        svg.Element.use = function(node) {
            this.base = svg.Element.RenderedElementBase;
            this.base(node);

            this.baseSetContext = this.setContext;
            this.setContext = function(ctx) {
                this.baseSetContext(ctx);
                if (this.attribute('x').hasValue()) ctx.translate(this.attribute('x').toPixels('x'), 0);
                if (this.attribute('y').hasValue()) ctx.translate(0, this.attribute('y').toPixels('y'));
            }

            var element = this.getHrefAttribute().getDefinition();

            this.path = function(ctx) {
                if (element != null) element.path(ctx);
            }

            this.getBoundingBox = function() {
                if (element != null) return element.getBoundingBox();
            }

            this.renderChildren = function(ctx) {
                if (element != null) {
                    var tempSvg = element;
                    if (element.type == 'symbol') {
                        // render me using a temporary svg element in symbol cases (http://www.w3.org/TR/SVG/struct.html#UseElement)
                        tempSvg = new svg.Element.svg();
                        tempSvg.type = 'svg';
                        tempSvg.attributes['viewBox'] = new svg.Property('viewBox', element.attribute('viewBox').value);
                        tempSvg.attributes['preserveAspectRatio'] = new svg.Property('preserveAspectRatio', element.attribute('preserveAspectRatio').value);
                        tempSvg.attributes['overflow'] = new svg.Property('overflow', element.attribute('overflow').value);
                        tempSvg.children = element.children;
                    }
                    if (tempSvg.type == 'svg') {
                        // if symbol or svg, inherit width/height from me
                        if (this.attribute('width').hasValue()) tempSvg.attributes['width'] = new svg.Property('width', this.attribute('width').value);
                        if (this.attribute('height').hasValue()) tempSvg.attributes['height'] = new svg.Property('height', this.attribute('height').value);
                    }
                    var oldParent = tempSvg.parent;
                    tempSvg.parent = null;
                    tempSvg.render(ctx);
                    tempSvg.parent = oldParent;
                }
            }
        }
        svg.Element.use.prototype = new svg.Element.RenderedElementBase;

        // mask element
        svg.Element.mask = function(node) {
            this.base = svg.Element.ElementBase;
            this.base(node);

            this.apply = function(ctx, element) {
                // render as temp svg
                var x = this.attribute('x').toPixels('x');
                var y = this.attribute('y').toPixels('y');
                var width = this.attribute('width').toPixels('x');
                var height = this.attribute('height').toPixels('y');

                if (width == 0 && height == 0) {
                    var bb = new svg.BoundingBox();
                    for (var i=0; i<this.children.length; i++) {
                        bb.addBoundingBox(this.children[i].getBoundingBox());
                    }
                    var x = Math.floor(bb.x1);
                    var y = Math.floor(bb.y1);
                    var width = Math.floor(bb.width());
                    var height = Math.floor(bb.height());
                }

                // temporarily remove mask to avoid recursion
                var mask = element.attribute('mask').value;
                element.attribute('mask').value = '';

                    var cMask = document.createElement('canvas');
                    cMask.width = x + width;
                    cMask.height = y + height;
                    var maskCtx = cMask.getContext('2d');
                    this.renderChildren(maskCtx);

                    var c = document.createElement('canvas');
                    c.width = x + width;
                    c.height = y + height;
                    var tempCtx = c.getContext('2d');
                    element.render(tempCtx);
                    tempCtx.globalCompositeOperation = 'destination-in';
                    tempCtx.fillStyle = maskCtx.createPattern(cMask, 'no-repeat');
                    tempCtx.fillRect(0, 0, x + width, y + height);

                    ctx.fillStyle = tempCtx.createPattern(c, 'no-repeat');
                    ctx.fillRect(0, 0, x + width, y + height);

                // reassign mask
                element.attribute('mask').value = mask;
            }

            this.render = function(ctx) {
                // NO RENDER
            }
        }
        svg.Element.mask.prototype = new svg.Element.ElementBase;

        // clip element
        svg.Element.clipPath = function(node) {
            this.base = svg.Element.ElementBase;
            this.base(node);

            this.apply = function(ctx) {
                for (var i=0; i<this.children.length; i++) {
                    var child = this.children[i];
                    if (typeof(child.path) != 'undefined') {
                        var transform = null;
                        if (child.attribute('transform').hasValue()) {
                            transform = new svg.Transform(child.attribute('transform').value);
                            transform.apply(ctx);
                        }
                        child.path(ctx);
                        ctx.clip();
                        if (transform) { transform.unapply(ctx); }
                    }
                }
            }

            this.render = function(ctx) {
                // NO RENDER
            }
        }
        svg.Element.clipPath.prototype = new svg.Element.ElementBase;

        // filters
        svg.Element.filter = function(node) {
            this.base = svg.Element.ElementBase;
            this.base(node);

            this.apply = function(ctx, element) {
                // render as temp svg
                var bb = element.getBoundingBox();
                var x = Math.floor(bb.x1);
                var y = Math.floor(bb.y1);
                var width = Math.floor(bb.width());
                var height = Math.floor(bb.height());

                // temporarily remove filter to avoid recursion
                var filter = element.style('filter').value;
                element.style('filter').value = '';

                var px = 0, py = 0;
                for (var i=0; i<this.children.length; i++) {
                    var efd = this.children[i].extraFilterDistance || 0;
                    px = Math.max(px, efd);
                    py = Math.max(py, efd);
                }

                var c = document.createElement('canvas');
                c.width = width + 2*px;
                c.height = height + 2*py;
                var tempCtx = c.getContext('2d');
                tempCtx.translate(-x + px, -y + py);
                element.render(tempCtx);

                // apply filters
                for (var i=0; i<this.children.length; i++) {
                    this.children[i].apply(tempCtx, 0, 0, width + 2*px, height + 2*py);
                }

                // render on me
                ctx.drawImage(c, 0, 0, width + 2*px, height + 2*py, x - px, y - py, width + 2*px, height + 2*py);

                // reassign filter
                element.style('filter', true).value = filter;
            }

            this.render = function(ctx) {
                // NO RENDER
            }
        }
        svg.Element.filter.prototype = new svg.Element.ElementBase;

        svg.Element.feMorphology = function(node) {
            this.base = svg.Element.ElementBase;
            this.base(node);

            this.apply = function(ctx, x, y, width, height) {
                // TODO: implement
            }
        }
        svg.Element.feMorphology.prototype = new svg.Element.ElementBase;

        svg.Element.feComposite = function(node) {
            this.base = svg.Element.ElementBase;
            this.base(node);

            this.apply = function(ctx, x, y, width, height) {
                // TODO: implement
            }
        }
        svg.Element.feComposite.prototype = new svg.Element.ElementBase;

        svg.Element.feColorMatrix = function(node) {
            this.base = svg.Element.ElementBase;
            this.base(node);

            var matrix = svg.ToNumberArray(this.attribute('values').value);
            switch (this.attribute('type').valueOrDefault('matrix')) { // http://www.w3.org/TR/SVG/filters.html#feColorMatrixElement
                case 'saturate':
                    var s = matrix[0];
                    matrix = [0.213+0.787*s,0.715-0.715*s,0.072-0.072*s,0,0,
                              0.213-0.213*s,0.715+0.285*s,0.072-0.072*s,0,0,
                              0.213-0.213*s,0.715-0.715*s,0.072+0.928*s,0,0,
                              0,0,0,1,0,
                              0,0,0,0,1];
                    break;
                case 'hueRotate':
                    var a = matrix[0] * Math.PI / 180.0;
                    var c = function (m1,m2,m3) { return m1 + Math.cos(a)*m2 + Math.sin(a)*m3; };
                    matrix = [c(0.213,0.787,-0.213),c(0.715,-0.715,-0.715),c(0.072,-0.072,0.928),0,0,
                              c(0.213,-0.213,0.143),c(0.715,0.285,0.140),c(0.072,-0.072,-0.283),0,0,
                              c(0.213,-0.213,-0.787),c(0.715,-0.715,0.715),c(0.072,0.928,0.072),0,0,
                              0,0,0,1,0,
                              0,0,0,0,1];
                    break;
                case 'luminanceToAlpha':
                    matrix = [0,0,0,0,0,
                              0,0,0,0,0,
                              0,0,0,0,0,
                              0.2125,0.7154,0.0721,0,0,
                              0,0,0,0,1];
                    break;
            }

            function imGet(img, x, y, width, height, rgba) {
                return img[y*width*4 + x*4 + rgba];
            }

            function imSet(img, x, y, width, height, rgba, val) {
                img[y*width*4 + x*4 + rgba] = val;
            }

            function m(i, v) {
                var mi = matrix[i];
                return mi * (mi < 0 ? v - 255 : v);
            }

            this.apply = function(ctx, x, y, width, height) {
                // assuming x==0 && y==0 for now
                var srcData = ctx.getImageData(0, 0, width, height);
                for (var y = 0; y < height; y++) {
                    for (var x = 0; x < width; x++) {
                        var r = imGet(srcData.data, x, y, width, height, 0);
                        var g = imGet(srcData.data, x, y, width, height, 1);
                        var b = imGet(srcData.data, x, y, width, height, 2);
                        var a = imGet(srcData.data, x, y, width, height, 3);
                        imSet(srcData.data, x, y, width, height, 0, m(0,r)+m(1,g)+m(2,b)+m(3,a)+m(4,1));
                        imSet(srcData.data, x, y, width, height, 1, m(5,r)+m(6,g)+m(7,b)+m(8,a)+m(9,1));
                        imSet(srcData.data, x, y, width, height, 2, m(10,r)+m(11,g)+m(12,b)+m(13,a)+m(14,1));
                        imSet(srcData.data, x, y, width, height, 3, m(15,r)+m(16,g)+m(17,b)+m(18,a)+m(19,1));
                    }
                }
                ctx.clearRect(0, 0, width, height);
                ctx.putImageData(srcData, 0, 0);
            }
        }
        svg.Element.feColorMatrix.prototype = new svg.Element.ElementBase;

        svg.Element.feGaussianBlur = function(node) {
            this.base = svg.Element.ElementBase;
            this.base(node);

            this.blurRadius = Math.floor(this.attribute('stdDeviation').numValue());
            this.extraFilterDistance = this.blurRadius;

            this.apply = function(ctx, x, y, width, height) {
                if (typeof(stackBlurCanvasRGBA) == 'undefined') {
                    svg.log('ERROR: StackBlur.js must be included for blur to work');
                    return;
                }

                // StackBlur requires canvas be on document
                ctx.canvas.id = svg.UniqueId();
                ctx.canvas.style.display = 'none';
                document.body.appendChild(ctx.canvas);
                stackBlurCanvasRGBA(ctx.canvas.id, x, y, width, height, this.blurRadius);
                document.body.removeChild(ctx.canvas);
            }
        }
        svg.Element.feGaussianBlur.prototype = new svg.Element.ElementBase;

        // title element, do nothing
        svg.Element.title = function(node) {
        }
        svg.Element.title.prototype = new svg.Element.ElementBase;

        // desc element, do nothing
        svg.Element.desc = function(node) {
        }
        svg.Element.desc.prototype = new svg.Element.ElementBase;

        svg.Element.MISSING = function(node) {
            svg.log('ERROR: Element \'' + node.nodeName + '\' not yet implemented.');
        }
        svg.Element.MISSING.prototype = new svg.Element.ElementBase;

        // element factory
        svg.CreateElement = function(node) {
            var className = node.nodeName.replace(/^[^:]+:/,''); // remove namespace
            className = className.replace(/\-/g,''); // remove dashes
            var e = null;
            if (typeof(svg.Element[className]) != 'undefined') {
                e = new svg.Element[className](node);
            }
            else {
                e = new svg.Element.MISSING(node);
            }

            e.type = node.nodeName;
            return e;
        }

        // load from url
        svg.load = function(ctx, url) {
            svg.loadXml(ctx, svg.ajax(url));
        }

        // load from xml
        svg.loadXml = function(ctx, xml) {
            svg.loadXmlDoc(ctx, svg.parseXml(xml));
        }

        svg.loadXmlDoc = function(ctx, dom) {
            svg.init(ctx);

            var mapXY = function(p) {
                var e = ctx.canvas;
                while (e) {
                    p.x -= e.offsetLeft;
                    p.y -= e.offsetTop;
                    e = e.offsetParent;
                }
                if (window.scrollX) p.x += window.scrollX;
                if (window.scrollY) p.y += window.scrollY;
                return p;
            }

            // bind mouse
            if (svg.opts['ignoreMouse'] != true) {
                ctx.canvas.onclick = function(e) {
                    var p = mapXY(new svg.Point(e != null ? e.clientX : event.clientX, e != null ? e.clientY : event.clientY));
                    svg.Mouse.onclick(p.x, p.y);
                };
                ctx.canvas.onmousemove = function(e) {
                    var p = mapXY(new svg.Point(e != null ? e.clientX : event.clientX, e != null ? e.clientY : event.clientY));
                    svg.Mouse.onmousemove(p.x, p.y);
                };
            }

            var e = svg.CreateElement(dom.documentElement);
            e.root = true;

            // render loop
            var isFirstRender = true;
            var draw = function() {
                svg.ViewPort.Clear();
                if (ctx.canvas.parentNode) svg.ViewPort.SetCurrent(ctx.canvas.parentNode.clientWidth, ctx.canvas.parentNode.clientHeight);

                if (svg.opts['ignoreDimensions'] != true) {
                    // set canvas size
                    if (e.style('width').hasValue()) {
                        ctx.canvas.width = e.style('width').toPixels('x');
                        ctx.canvas.style.width = ctx.canvas.width + 'px';
                    }
                    if (e.style('height').hasValue()) {
                        ctx.canvas.height = e.style('height').toPixels('y');
                        ctx.canvas.style.height = ctx.canvas.height + 'px';
                    }
                }
                var cWidth = ctx.canvas.clientWidth || ctx.canvas.width;
                var cHeight = ctx.canvas.clientHeight || ctx.canvas.height;
                if (svg.opts['ignoreDimensions'] == true && e.style('width').hasValue() && e.style('height').hasValue()) {
                    cWidth = e.style('width').toPixels('x');
                    cHeight = e.style('height').toPixels('y');
                }
                svg.ViewPort.SetCurrent(cWidth, cHeight);

                if (svg.opts['offsetX'] != null) e.attribute('x', true).value = svg.opts['offsetX'];
                if (svg.opts['offsetY'] != null) e.attribute('y', true).value = svg.opts['offsetY'];
                if (svg.opts['scaleWidth'] != null && svg.opts['scaleHeight'] != null) {
                    var xRatio = 1, yRatio = 1, viewBox = svg.ToNumberArray(e.attribute('viewBox').value);
                    if (e.attribute('width').hasValue()) xRatio = e.attribute('width').toPixels('x') / svg.opts['scaleWidth'];
                    else if (!isNaN(viewBox[2])) xRatio = viewBox[2] / svg.opts['scaleWidth'];
                    if (e.attribute('height').hasValue()) yRatio = e.attribute('height').toPixels('y') / svg.opts['scaleHeight'];
                    else if (!isNaN(viewBox[3])) yRatio = viewBox[3] / svg.opts['scaleHeight'];

                    e.attribute('width', true).value = svg.opts['scaleWidth'];
                    e.attribute('height', true).value = svg.opts['scaleHeight'];
                    e.attribute('viewBox', true).value = '0 0 ' + (cWidth * xRatio) + ' ' + (cHeight * yRatio);
                    e.attribute('preserveAspectRatio', true).value = 'none';
                }

                // clear and render
                if (svg.opts['ignoreClear'] != true) {
                    ctx.clearRect(0, 0, cWidth, cHeight);
                }
                e.render(ctx);
                if (isFirstRender) {
                    isFirstRender = false;
                    if (typeof(svg.opts['renderCallback']) == 'function') svg.opts['renderCallback'](dom);
                }
            }

            var waitingForImages = true;
            if (svg.ImagesLoaded()) {
                waitingForImages = false;
                draw();
            }
            svg.intervalID = setInterval(function() {
                var needUpdate = false;

                if (waitingForImages && svg.ImagesLoaded()) {
                    waitingForImages = false;
                    needUpdate = true;
                }

                // need update from mouse events?
                if (svg.opts['ignoreMouse'] != true) {
                    needUpdate = needUpdate | svg.Mouse.hasEvents();
                }

                // need update from animations?
                if (svg.opts['ignoreAnimation'] != true) {
                    for (var i=0; i<svg.Animations.length; i++) {
                        needUpdate = needUpdate | svg.Animations[i].update(1000 / svg.FRAMERATE);
                    }
                }

                // need update from redraw?
                if (typeof(svg.opts['forceRedraw']) == 'function') {
                    if (svg.opts['forceRedraw']() == true) needUpdate = true;
                }

                // render if needed
                if (needUpdate) {
                    draw();
                    svg.Mouse.runEvents(); // run and clear our events
                }
            }, 1000 / svg.FRAMERATE);
        }

        svg.stop = function() {
            if (svg.intervalID) {
                clearInterval(svg.intervalID);
            }
        }

        svg.Mouse = new (function() {
            this.events = [];
            this.hasEvents = function() { return this.events.length != 0; }

            this.onclick = function(x, y) {
                this.events.push({ type: 'onclick', x: x, y: y,
                    run: function(e) { if (e.onclick) e.onclick(); }
                });
            }

            this.onmousemove = function(x, y) {
                this.events.push({ type: 'onmousemove', x: x, y: y,
                    run: function(e) { if (e.onmousemove) e.onmousemove(); }
                });
            }

            this.eventElements = [];

            this.checkPath = function(element, ctx) {
                for (var i=0; i<this.events.length; i++) {
                    var e = this.events[i];
                    if (ctx.isPointInPath && ctx.isPointInPath(e.x, e.y)) this.eventElements[i] = element;
                }
            }

            this.checkBoundingBox = function(element, bb) {
                for (var i=0; i<this.events.length; i++) {
                    var e = this.events[i];
                    if (bb.isPointInBox(e.x, e.y)) this.eventElements[i] = element;
                }
            }

            this.runEvents = function() {
                svg.ctx.canvas.style.cursor = '';

                for (var i=0; i<this.events.length; i++) {
                    var e = this.events[i];
                    var element = this.eventElements[i];
                    while (element) {
                        e.run(element);
                        element = element.parent;
                    }
                }

                // done running, clear
                this.events = [];
                this.eventElements = [];
            }
        });

        return svg;
    }
})();

if (typeof(CanvasRenderingContext2D) != 'undefined') {
    CanvasRenderingContext2D.prototype.drawSvg = function(s, dx, dy, dw, dh) {
        canvg(this.canvas, s, {
            ignoreMouse: true,
            ignoreAnimation: true,
            ignoreDimensions: true,
            ignoreClear: true,
            offsetX: dx,
            offsetY: dy,
            scaleWidth: dw,
            scaleHeight: dh
        });
    }
}
