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Updated excanvas to r3, March 09.
master
1 parent 26a1b2a commit 81f32ef035941219afde6bf680331a03655ed34d
@Alex Tucker Alex Tucker authored on 17 Aug 2009
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 src/main/webapp/excanvas.js
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
document.createElement("canvas").getContext||(function(){var s=Math,j=s.round,F=s.sin,G=s.cos,V=s.abs,W=s.sqrt,k=10,v=k/2;function X(){return this.context_||(this.context_=new H(this))}var L=Array.prototype.slice;function Y(b,a){var c=L.call(arguments,2);return function(){return b.apply(a,c.concat(L.call(arguments)))}}var M={init:function(b){if(/MSIE/.test(navigator.userAgent)&&!window.opera){var a=b||document;a.createElement("canvas");a.attachEvent("onreadystatechange",Y(this.init_,this,a))}},init_:function(b){b.namespaces.g_vml_||
b.namespaces.add("g_vml_","urn:schemas-microsoft-com:vml","#default#VML");b.namespaces.g_o_||b.namespaces.add("g_o_","urn:schemas-microsoft-com:office:office","#default#VML");if(!b.styleSheets.ex_canvas_){var a=b.createStyleSheet();a.owningElement.id="ex_canvas_";a.cssText="canvas{display:inline-block;overflow:hidden;text-align:left;width:300px;height:150px}g_vml_\\:*{behavior:url(#default#VML)}g_o_\\:*{behavior:url(#default#VML)}"}var c=b.getElementsByTagName("canvas"),d=0;for(;d<c.length;d++)this.initElement(c[d])},
initElement:function(b){if(!b.getContext){b.getContext=X;b.innerHTML="";b.attachEvent("onpropertychange",Z);b.attachEvent("onresize",$);var a=b.attributes;if(a.width&&a.width.specified)b.style.width=a.width.nodeValue+"px";else b.width=b.clientWidth;if(a.height&&a.height.specified)b.style.height=a.height.nodeValue+"px";else b.height=b.clientHeight}return b}};function Z(b){var a=b.srcElement;switch(b.propertyName){case "width":a.style.width=a.attributes.width.nodeValue+"px";a.getContext().clearRect();
break;case "height":a.style.height=a.attributes.height.nodeValue+"px";a.getContext().clearRect();break}}function $(b){var a=b.srcElement;if(a.firstChild){a.firstChild.style.width=a.clientWidth+"px";a.firstChild.style.height=a.clientHeight+"px"}}M.init();var N=[],B=0;for(;B<16;B++){var C=0;for(;C<16;C++)N[B*16+C]=B.toString(16)+C.toString(16)}function I(){return[[1,0,0],[0,1,0],[0,0,1]]}function y(b,a){var c=I(),d=0;for(;d<3;d++){var f=0;for(;f<3;f++){var h=0,g=0;for(;g<3;g++)h+=b[d][g]*a[g][f];c[d][f]=
h}}return c}function O(b,a){a.fillStyle=b.fillStyle;a.lineCap=b.lineCap;a.lineJoin=b.lineJoin;a.lineWidth=b.lineWidth;a.miterLimit=b.miterLimit;a.shadowBlur=b.shadowBlur;a.shadowColor=b.shadowColor;a.shadowOffsetX=b.shadowOffsetX;a.shadowOffsetY=b.shadowOffsetY;a.strokeStyle=b.strokeStyle;a.globalAlpha=b.globalAlpha;a.arcScaleX_=b.arcScaleX_;a.arcScaleY_=b.arcScaleY_;a.lineScale_=b.lineScale_}function P(b){var a,c=1;b=String(b);if(b.substring(0,3)=="rgb"){var d=b.indexOf("(",3),f=b.indexOf(")",d+
1),h=b.substring(d+1,f).split(",");a="#";var g=0;for(;g<3;g++)a+=N[Number(h[g])];if(h.length==4&&b.substr(3,1)=="a")c=h[3]}else a=b;return{color:a,alpha:c}}function aa(b){switch(b){case "butt":return"flat";case "round":return"round";case "square":default:return"square"}}function H(b){this.m_=I();this.mStack_=[];this.aStack_=[];this.currentPath_=[];this.fillStyle=this.strokeStyle="#000";this.lineWidth=1;this.lineJoin="miter";this.lineCap="butt";this.miterLimit=k*1;this.globalAlpha=1;this.canvas=b;
var a=b.ownerDocument.createElement("div");a.style.width=b.clientWidth+"px";a.style.height=b.clientHeight+"px";a.style.overflow="hidden";a.style.position="absolute";b.appendChild(a);this.element_=a;this.lineScale_=this.arcScaleY_=this.arcScaleX_=1}var i=H.prototype;i.clearRect=function(){this.element_.innerHTML=""};i.beginPath=function(){this.currentPath_=[]};i.moveTo=function(b,a){var c=this.getCoords_(b,a);this.currentPath_.push({type:"moveTo",x:c.x,y:c.y});this.currentX_=c.x;this.currentY_=c.y};
i.lineTo=function(b,a){var c=this.getCoords_(b,a);this.currentPath_.push({type:"lineTo",x:c.x,y:c.y});this.currentX_=c.x;this.currentY_=c.y};i.bezierCurveTo=function(b,a,c,d,f,h){var g=this.getCoords_(f,h),l=this.getCoords_(b,a),e=this.getCoords_(c,d);Q(this,l,e,g)};function Q(b,a,c,d){b.currentPath_.push({type:"bezierCurveTo",cp1x:a.x,cp1y:a.y,cp2x:c.x,cp2y:c.y,x:d.x,y:d.y});b.currentX_=d.x;b.currentY_=d.y}i.quadraticCurveTo=function(b,a,c,d){var f=this.getCoords_(b,a),h=this.getCoords_(c,d),g={x:this.currentX_+
0.6666666666666666*(f.x-this.currentX_),y:this.currentY_+0.6666666666666666*(f.y-this.currentY_)};Q(this,g,{x:g.x+(h.x-this.currentX_)/3,y:g.y+(h.y-this.currentY_)/3},h)};i.arc=function(b,a,c,d,f,h){c*=k;var g=h?"at":"wa",l=b+G(d)*c-v,e=a+F(d)*c-v,m=b+G(f)*c-v,r=a+F(f)*c-v;if(l==m&&!h)l+=0.125;var n=this.getCoords_(b,a),o=this.getCoords_(l,e),q=this.getCoords_(m,r);this.currentPath_.push({type:g,x:n.x,y:n.y,radius:c,xStart:o.x,yStart:o.y,xEnd:q.x,yEnd:q.y})};i.rect=function(b,a,c,d){this.moveTo(b,
a);this.lineTo(b+c,a);this.lineTo(b+c,a+d);this.lineTo(b,a+d);this.closePath()};i.strokeRect=function(b,a,c,d){var f=this.currentPath_;this.beginPath();this.moveTo(b,a);this.lineTo(b+c,a);this.lineTo(b+c,a+d);this.lineTo(b,a+d);this.closePath();this.stroke();this.currentPath_=f};i.fillRect=function(b,a,c,d){var f=this.currentPath_;this.beginPath();this.moveTo(b,a);this.lineTo(b+c,a);this.lineTo(b+c,a+d);this.lineTo(b,a+d);this.closePath();this.fill();this.currentPath_=f};i.createLinearGradient=function(b,
a,c,d){var f=new D("gradient");f.x0_=b;f.y0_=a;f.x1_=c;f.y1_=d;return f};i.createRadialGradient=function(b,a,c,d,f,h){var g=new D("gradientradial");g.x0_=b;g.y0_=a;g.r0_=c;g.x1_=d;g.y1_=f;g.r1_=h;return g};i.drawImage=function(b){var a,c,d,f,h,g,l,e,m=b.runtimeStyle.width,r=b.runtimeStyle.height;b.runtimeStyle.width="auto";b.runtimeStyle.height="auto";var n=b.width,o=b.height;b.runtimeStyle.width=m;b.runtimeStyle.height=r;if(arguments.length==3){a=arguments[1];c=arguments[2];h=g=0;l=d=n;e=f=o}else if(arguments.length==
5){a=arguments[1];c=arguments[2];d=arguments[3];f=arguments[4];h=g=0;l=n;e=o}else if(arguments.length==9){h=arguments[1];g=arguments[2];l=arguments[3];e=arguments[4];a=arguments[5];c=arguments[6];d=arguments[7];f=arguments[8]}else throw Error("Invalid number of arguments");var q=this.getCoords_(a,c),t=[];t.push(" <g_vml_:group",' coordsize="',k*10,",",k*10,'"',' coordorigin="0,0"',' style="width:',10,"px;height:",10,"px;position:absolute;");if(this.m_[0][0]!=1||this.m_[0][1]){var E=[];E.push("M11=",
this.m_[0][0],",","M12=",this.m_[1][0],",","M21=",this.m_[0][1],",","M22=",this.m_[1][1],",","Dx=",j(q.x/k),",","Dy=",j(q.y/k),"");var p=q,z=this.getCoords_(a+d,c),w=this.getCoords_(a,c+f),x=this.getCoords_(a+d,c+f);p.x=s.max(p.x,z.x,w.x,x.x);p.y=s.max(p.y,z.y,w.y,x.y);t.push("padding:0 ",j(p.x/k),"px ",j(p.y/k),"px 0;filter:progid:DXImageTransform.Microsoft.Matrix(",E.join(""),", sizingmethod='clip');")}else t.push("top:",j(q.y/k),"px;left:",j(q.x/k),"px;");t.push(' ">','<g_vml_:image src="',b.src,
'"',' style="width:',k*d,"px;"," height:",k*f,'px;"',' cropleft="',h/n,'"',' croptop="',g/o,'"',' cropright="',(n-h-l)/n,'"',' cropbottom="',(o-g-e)/o,'"'," />","</g_vml_:group>");this.element_.insertAdjacentHTML("BeforeEnd",t.join(""))};i.stroke=function(b){var a=[],c=P(b?this.fillStyle:this.strokeStyle),d=c.color,f=c.alpha*this.globalAlpha;a.push("<g_vml_:shape",' filled="',!!b,'"',' style="position:absolute;width:',10,"px;height:",10,'px;"',' coordorigin="0 0" coordsize="',k*10," ",k*10,'"',' stroked="',
!b,'"',' path="');var h={x:null,y:null},g={x:null,y:null},l=0;for(;l<this.currentPath_.length;l++){var e=this.currentPath_[l];switch(e.type){case "moveTo":a.push(" m ",j(e.x),",",j(e.y));break;case "lineTo":a.push(" l ",j(e.x),",",j(e.y));break;case "close":a.push(" x ");e=null;break;case "bezierCurveTo":a.push(" c ",j(e.cp1x),",",j(e.cp1y),",",j(e.cp2x),",",j(e.cp2y),",",j(e.x),",",j(e.y));break;case "at":case "wa":a.push(" ",e.type," ",j(e.x-this.arcScaleX_*e.radius),",",j(e.y-this.arcScaleY_*e.radius),
" ",j(e.x+this.arcScaleX_*e.radius),",",j(e.y+this.arcScaleY_*e.radius)," ",j(e.xStart),",",j(e.yStart)," ",j(e.xEnd),",",j(e.yEnd));break}if(e){if(h.x==null||e.x<h.x)h.x=e.x;if(g.x==null||e.x>g.x)g.x=e.x;if(h.y==null||e.y<h.y)h.y=e.y;if(g.y==null||e.y>g.y)g.y=e.y}}a.push(' ">');if(b)if(typeof this.fillStyle=="object"){var m=this.fillStyle,r=0,n={x:0,y:0},o=0,q=1;if(m.type_=="gradient"){var t=m.x1_/this.arcScaleX_,E=m.y1_/this.arcScaleY_,p=this.getCoords_(m.x0_/this.arcScaleX_,m.y0_/this.arcScaleY_),
z=this.getCoords_(t,E);r=Math.atan2(z.x-p.x,z.y-p.y)*180/Math.PI;if(r<0)r+=360;if(r<1.0E-6)r=0}else{var p=this.getCoords_(m.x0_,m.y0_),w=g.x-h.x,x=g.y-h.y;n={x:(p.x-h.x)/w,y:(p.y-h.y)/x};w/=this.arcScaleX_*k;x/=this.arcScaleY_*k;var R=s.max(w,x);o=2*m.r0_/R;q=2*m.r1_/R-o}var u=m.colors_;u.sort(function(ba,ca){return ba.offset-ca.offset});var J=u.length,da=u[0].color,ea=u[J-1].color,fa=u[0].alpha*this.globalAlpha,ga=u[J-1].alpha*this.globalAlpha,S=[],l=0;for(;l<J;l++){var T=u[l];S.push(T.offset*q+
o+" "+T.color)}a.push('<g_vml_:fill type="',m.type_,'"',' method="none" focus="100%"',' color="',da,'"',' color2="',ea,'"',' colors="',S.join(","),'"',' opacity="',ga,'"',' g_o_:opacity2="',fa,'"',' angle="',r,'"',' focusposition="',n.x,",",n.y,'" />')}else a.push('<g_vml_:fill color="',d,'" opacity="',f,'" />');else{var K=this.lineScale_*this.lineWidth;if(K<1)f*=K;a.push("<g_vml_:stroke",' opacity="',f,'"',' joinstyle="',this.lineJoin,'"',' miterlimit="',this.miterLimit,'"',' endcap="',aa(this.lineCap),
'"',' weight="',K,'px"',' color="',d,'" />')}a.push("</g_vml_:shape>");this.element_.insertAdjacentHTML("beforeEnd",a.join(""))};i.fill=function(){this.stroke(true)};i.closePath=function(){this.currentPath_.push({type:"close"})};i.getCoords_=function(b,a){var c=this.m_;return{x:k*(b*c[0][0]+a*c[1][0]+c[2][0])-v,y:k*(b*c[0][1]+a*c[1][1]+c[2][1])-v}};i.save=function(){var b={};O(this,b);this.aStack_.push(b);this.mStack_.push(this.m_);this.m_=y(I(),this.m_)};i.restore=function(){O(this.aStack_.pop(),
this);this.m_=this.mStack_.pop()};function ha(b){var a=0;for(;a<3;a++){var c=0;for(;c<2;c++)if(!isFinite(b[a][c])||isNaN(b[a][c]))return false}return true}function A(b,a,c){if(!!ha(a)){b.m_=a;if(c)b.lineScale_=W(V(a[0][0]*a[1][1]-a[0][1]*a[1][0]))}}i.translate=function(b,a){A(this,y([[1,0,0],[0,1,0],[b,a,1]],this.m_),false)};i.rotate=function(b){var a=G(b),c=F(b);A(this,y([[a,c,0],[-c,a,0],[0,0,1]],this.m_),false)};i.scale=function(b,a){this.arcScaleX_*=b;this.arcScaleY_*=a;A(this,y([[b,0,0],[0,a,
0],[0,0,1]],this.m_),true)};i.transform=function(b,a,c,d,f,h){A(this,y([[b,a,0],[c,d,0],[f,h,1]],this.m_),true)};i.setTransform=function(b,a,c,d,f,h){A(this,[[b,a,0],[c,d,0],[f,h,1]],true)};i.clip=function(){};i.arcTo=function(){};i.createPattern=function(){return new U};function D(b){this.type_=b;this.r1_=this.y1_=this.x1_=this.r0_=this.y0_=this.x0_=0;this.colors_=[]}D.prototype.addColorStop=function(b,a){a=P(a);this.colors_.push({offset:b,color:a.color,alpha:a.alpha})};function U(){}G_vmlCanvasManager=
M;CanvasRenderingContext2D=H;CanvasGradient=D;CanvasPattern=U})();
 
// Known Issues:
//
// * Patterns are not implemented.
// * Radial gradient are not implemented. The VML version of these look very
// different from the canvas one.
// * Clipping paths are not implemented.
// * Coordsize. The width and height attribute have higher priority than the
// width and height style values which isn't correct.
// * Painting mode isn't implemented.
// * Canvas width/height should is using content-box by default. IE in
// Quirks mode will draw the canvas using border-box. Either change your
// doctype to HTML5
// (http://www.whatwg.org/specs/web-apps/current-work/#the-doctype)
// or use Box Sizing Behavior from WebFX
// (http://webfx.eae.net/dhtml/boxsizing/boxsizing.html)
// * Optimize. There is always room for speed improvements.
 
// only add this code if we do not already have a canvas implementation
if (!window.CanvasRenderingContext2D) {
 
(function () {
 
// alias some functions to make (compiled) code shorter
var m = Math;
var mr = m.round;
var ms = m.sin;
var mc = m.cos;
 
// this is used for sub pixel precision
var Z = 10;
var Z2 = Z / 2;
 
var G_vmlCanvasManager_ = {
init: function (opt_doc) {
var doc = opt_doc || document;
if (/MSIE/.test(navigator.userAgent) && !window.opera) {
var self = this;
doc.attachEvent("onreadystatechange", function () {
self.init_(doc);
});
}
},
 
init_: function (doc) {
if (doc.readyState == "complete") {
// create xmlns
if (!doc.namespaces["g_vml_"]) {
doc.namespaces.add("g_vml_", "urn:schemas-microsoft-com:vml");
}
 
// setup default css
var ss = doc.createStyleSheet();
ss.cssText = "canvas{display:inline-block;overflow:hidden;" +
// default size is 300x150 in Gecko and Opera
"text-align:left;width:300px;height:150px}" +
"g_vml_\\:*{behavior:url(#default#VML)}";
 
// find all canvas elements
var els = doc.getElementsByTagName("canvas");
for (var i = 0; i < els.length; i++) {
if (!els[i].getContext) {
this.initElement(els[i]);
}
}
}
},
 
fixElement_: function (el) {
// in IE before version 5.5 we would need to add HTML: to the tag name
// but we do not care about IE before version 6
var outerHTML = el.outerHTML;
 
var newEl = el.ownerDocument.createElement(outerHTML);
// if the tag is still open IE has created the children as siblings and
// it has also created a tag with the name "/FOO"
if (outerHTML.slice(-2) != "/>") {
var tagName = "/" + el.tagName;
var ns;
// remove content
while ((ns = el.nextSibling) && ns.tagName != tagName) {
ns.removeNode();
}
// remove the incorrect closing tag
if (ns) {
ns.removeNode();
}
}
el.parentNode.replaceChild(newEl, el);
return newEl;
},
 
/**
* Public initializes a canvas element so that it can be used as canvas
* element from now on. This is called automatically before the page is
* loaded but if you are creating elements using createElement you need to
* make sure this is called on the element.
* @param {HTMLElement} el The canvas element to initialize.
* @return {HTMLElement} the element that was created.
*/
initElement: function (el) {
el = this.fixElement_(el);
el.getContext = function () {
if (this.context_) {
return this.context_;
}
return this.context_ = new CanvasRenderingContext2D_(this);
};
 
// do not use inline function because that will leak memory
el.attachEvent('onpropertychange', onPropertyChange);
el.attachEvent('onresize', onResize);
 
var attrs = el.attributes;
if (attrs.width && attrs.width.specified) {
// TODO: use runtimeStyle and coordsize
// el.getContext().setWidth_(attrs.width.nodeValue);
el.style.width = attrs.width.nodeValue + "px";
} else {
el.width = el.clientWidth;
}
if (attrs.height && attrs.height.specified) {
// TODO: use runtimeStyle and coordsize
// el.getContext().setHeight_(attrs.height.nodeValue);
el.style.height = attrs.height.nodeValue + "px";
} else {
el.height = el.clientHeight;
}
//el.getContext().setCoordsize_()
return el;
}
};
 
function onPropertyChange(e) {
var el = e.srcElement;
 
switch (e.propertyName) {
case 'width':
el.style.width = el.attributes.width.nodeValue + "px";
el.getContext().clearRect();
break;
case 'height':
el.style.height = el.attributes.height.nodeValue + "px";
el.getContext().clearRect();
break;
}
}
 
function onResize(e) {
var el = e.srcElement;
if (el.firstChild) {
el.firstChild.style.width = el.clientWidth + 'px';
el.firstChild.style.height = el.clientHeight + 'px';
}
}
 
G_vmlCanvasManager_.init();
 
// precompute "00" to "FF"
var dec2hex = [];
for (var i = 0; i < 16; i++) {
for (var j = 0; j < 16; j++) {
dec2hex[i * 16 + j] = i.toString(16) + j.toString(16);
}
}
 
function createMatrixIdentity() {
return [
[1, 0, 0],
[0, 1, 0],
[0, 0, 1]
];
}
 
function matrixMultiply(m1, m2) {
var result = createMatrixIdentity();
 
for (var x = 0; x < 3; x++) {
for (var y = 0; y < 3; y++) {
var sum = 0;
 
for (var z = 0; z < 3; z++) {
sum += m1[x][z] * m2[z][y];
}
 
result[x][y] = sum;
}
}
return result;
}
 
function copyState(o1, o2) {
o2.fillStyle = o1.fillStyle;
o2.lineCap = o1.lineCap;
o2.lineJoin = o1.lineJoin;
o2.lineWidth = o1.lineWidth;
o2.miterLimit = o1.miterLimit;
o2.shadowBlur = o1.shadowBlur;
o2.shadowColor = o1.shadowColor;
o2.shadowOffsetX = o1.shadowOffsetX;
o2.shadowOffsetY = o1.shadowOffsetY;
o2.strokeStyle = o1.strokeStyle;
o2.arcScaleX_ = o1.arcScaleX_;
o2.arcScaleY_ = o1.arcScaleY_;
}
 
function processStyle(styleString) {
var str, alpha = 1;
 
styleString = String(styleString);
if (styleString.substring(0, 3) == "rgb") {
var start = styleString.indexOf("(", 3);
var end = styleString.indexOf(")", start + 1);
var guts = styleString.substring(start + 1, end).split(",");
 
str = "#";
for (var i = 0; i < 3; i++) {
str += dec2hex[Number(guts[i])];
}
 
if ((guts.length == 4) && (styleString.substr(3, 1) == "a")) {
alpha = guts[3];
}
} else {
str = styleString;
}
 
return [str, alpha];
}
 
function processLineCap(lineCap) {
switch (lineCap) {
case "butt":
return "flat";
case "round":
return "round";
case "square":
default:
return "square";
}
}
 
/**
* This class implements CanvasRenderingContext2D interface as described by
* the WHATWG.
* @param {HTMLElement} surfaceElement The element that the 2D context should
* be associated with
*/
function CanvasRenderingContext2D_(surfaceElement) {
this.m_ = createMatrixIdentity();
 
this.mStack_ = [];
this.aStack_ = [];
this.currentPath_ = [];
 
// Canvas context properties
this.strokeStyle = "#000";
this.fillStyle = "#000";
 
this.lineWidth = 1;
this.lineJoin = "miter";
this.lineCap = "butt";
this.miterLimit = Z * 1;
this.globalAlpha = 1;
this.canvas = surfaceElement;
 
var el = surfaceElement.ownerDocument.createElement('div');
el.style.width = surfaceElement.clientWidth + 'px';
el.style.height = surfaceElement.clientHeight + 'px';
el.style.overflow = 'hidden';
el.style.position = 'absolute';
surfaceElement.appendChild(el);
 
this.element_ = el;
this.arcScaleX_ = 1;
this.arcScaleY_ = 1;
};
 
var contextPrototype = CanvasRenderingContext2D_.prototype;
contextPrototype.clearRect = function() {
this.element_.innerHTML = "";
this.currentPath_ = [];
};
 
contextPrototype.beginPath = function() {
// TODO: Branch current matrix so that save/restore has no effect
// as per safari docs.
 
this.currentPath_ = [];
};
 
contextPrototype.moveTo = function(aX, aY) {
this.currentPath_.push({type: "moveTo", x: aX, y: aY});
this.currentX_ = aX;
this.currentY_ = aY;
};
 
contextPrototype.lineTo = function(aX, aY) {
this.currentPath_.push({type: "lineTo", x: aX, y: aY});
this.currentX_ = aX;
this.currentY_ = aY;
};
 
contextPrototype.bezierCurveTo = function(aCP1x, aCP1y,
aCP2x, aCP2y,
aX, aY) {
this.currentPath_.push({type: "bezierCurveTo",
cp1x: aCP1x,
cp1y: aCP1y,
cp2x: aCP2x,
cp2y: aCP2y,
x: aX,
y: aY});
this.currentX_ = aX;
this.currentY_ = aY;
};
 
contextPrototype.quadraticCurveTo = function(aCPx, aCPy, aX, aY) {
// the following is lifted almost directly from
// http://developer.mozilla.org/en/docs/Canvas_tutorial:Drawing_shapes
var cp1x = this.currentX_ + 2.0 / 3.0 * (aCPx - this.currentX_);
var cp1y = this.currentY_ + 2.0 / 3.0 * (aCPy - this.currentY_);
var cp2x = cp1x + (aX - this.currentX_) / 3.0;
var cp2y = cp1y + (aY - this.currentY_) / 3.0;
this.bezierCurveTo(cp1x, cp1y, cp2x, cp2y, aX, aY);
};
 
contextPrototype.arc = function(aX, aY, aRadius,
aStartAngle, aEndAngle, aClockwise) {
aRadius *= Z;
var arcType = aClockwise ? "at" : "wa";
 
var xStart = aX + (mc(aStartAngle) * aRadius) - Z2;
var yStart = aY + (ms(aStartAngle) * aRadius) - Z2;
 
var xEnd = aX + (mc(aEndAngle) * aRadius) - Z2;
var yEnd = aY + (ms(aEndAngle) * aRadius) - Z2;
 
// IE won't render arches drawn counter clockwise if xStart == xEnd.
if (xStart == xEnd && !aClockwise) {
xStart += 0.125; // Offset xStart by 1/80 of a pixel. Use something
// that can be represented in binary
}
 
this.currentPath_.push({type: arcType,
x: aX,
y: aY,
radius: aRadius,
xStart: xStart,
yStart: yStart,
xEnd: xEnd,
yEnd: yEnd});
 
};
 
contextPrototype.rect = function(aX, aY, aWidth, aHeight) {
this.moveTo(aX, aY);
this.lineTo(aX + aWidth, aY);
this.lineTo(aX + aWidth, aY + aHeight);
this.lineTo(aX, aY + aHeight);
this.closePath();
};
 
contextPrototype.strokeRect = function(aX, aY, aWidth, aHeight) {
// Will destroy any existing path (same as FF behaviour)
this.beginPath();
this.moveTo(aX, aY);
this.lineTo(aX + aWidth, aY);
this.lineTo(aX + aWidth, aY + aHeight);
this.lineTo(aX, aY + aHeight);
this.closePath();
this.stroke();
};
 
contextPrototype.fillRect = function(aX, aY, aWidth, aHeight) {
// Will destroy any existing path (same as FF behaviour)
this.beginPath();
this.moveTo(aX, aY);
this.lineTo(aX + aWidth, aY);
this.lineTo(aX + aWidth, aY + aHeight);
this.lineTo(aX, aY + aHeight);
this.closePath();
this.fill();
};
 
contextPrototype.createLinearGradient = function(aX0, aY0, aX1, aY1) {
var gradient = new CanvasGradient_("gradient");
return gradient;
};
 
contextPrototype.createRadialGradient = function(aX0, aY0,
aR0, aX1,
aY1, aR1) {
var gradient = new CanvasGradient_("gradientradial");
gradient.radius1_ = aR0;
gradient.radius2_ = aR1;
gradient.focus_.x = aX0;
gradient.focus_.y = aY0;
return gradient;
};
 
contextPrototype.drawImage = function (image, var_args) {
var dx, dy, dw, dh, sx, sy, sw, sh;
 
// to find the original width we overide the width and height
var oldRuntimeWidth = image.runtimeStyle.width;
var oldRuntimeHeight = image.runtimeStyle.height;
image.runtimeStyle.width = 'auto';
image.runtimeStyle.height = 'auto';
 
// get the original size
var w = image.width;
var h = image.height;
 
// and remove overides
image.runtimeStyle.width = oldRuntimeWidth;
image.runtimeStyle.height = oldRuntimeHeight;
 
if (arguments.length == 3) {
dx = arguments[1];
dy = arguments[2];
sx = sy = 0;
sw = dw = w;
sh = dh = h;
} else if (arguments.length == 5) {
dx = arguments[1];
dy = arguments[2];
dw = arguments[3];
dh = arguments[4];
sx = sy = 0;
sw = w;
sh = h;
} else if (arguments.length == 9) {
sx = arguments[1];
sy = arguments[2];
sw = arguments[3];
sh = arguments[4];
dx = arguments[5];
dy = arguments[6];
dw = arguments[7];
dh = arguments[8];
} else {
throw "Invalid number of arguments";
}
 
var d = this.getCoords_(dx, dy);
 
var w2 = sw / 2;
var h2 = sh / 2;
 
var vmlStr = [];
 
var W = 10;
var H = 10;
 
// For some reason that I've now forgotten, using divs didn't work
vmlStr.push(' <g_vml_:group',
' coordsize="', Z * W, ',', Z * H, '"',
' coordorigin="0,0"' ,
' style="width:', W, ';height:', H, ';position:absolute;');
 
// If filters are necessary (rotation exists), create them
// filters are bog-slow, so only create them if abbsolutely necessary
// The following check doesn't account for skews (which don't exist
// in the canvas spec (yet) anyway.
 
if (this.m_[0][0] != 1 || this.m_[0][1]) {
var filter = [];
 
// Note the 12/21 reversal
filter.push("M11='", this.m_[0][0], "',",
"M12='", this.m_[1][0], "',",
"M21='", this.m_[0][1], "',",
"M22='", this.m_[1][1], "',",
"Dx='", mr(d.x / Z), "',",
"Dy='", mr(d.y / Z), "'");
 
// Bounding box calculation (need to minimize displayed area so that
// filters don't waste time on unused pixels.
var max = d;
var c2 = this.getCoords_(dx + dw, dy);
var c3 = this.getCoords_(dx, dy + dh);
var c4 = this.getCoords_(dx + dw, dy + dh);
 
max.x = Math.max(max.x, c2.x, c3.x, c4.x);
max.y = Math.max(max.y, c2.y, c3.y, c4.y);
 
vmlStr.push("padding:0 ", mr(max.x / Z), "px ", mr(max.y / Z),
"px 0;filter:progid:DXImageTransform.Microsoft.Matrix(",
filter.join(""), ", sizingmethod='clip');")
} else {
vmlStr.push("top:", mr(d.y / Z), "px;left:", mr(d.x / Z), "px;")
}
 
vmlStr.push(' ">' ,
'<g_vml_:image src="', image.src, '"',
' style="width:', Z * dw, ';',
' height:', Z * dh, ';"',
' cropleft="', sx / w, '"',
' croptop="', sy / h, '"',
' cropright="', (w - sx - sw) / w, '"',
' cropbottom="', (h - sy - sh) / h, '"',
' />',
'</g_vml_:group>');
 
this.element_.insertAdjacentHTML("BeforeEnd",
vmlStr.join(""));
};
 
contextPrototype.stroke = function(aFill) {
var lineStr = [];
var lineOpen = false;
var a = processStyle(aFill ? this.fillStyle : this.strokeStyle);
var color = a[0];
var opacity = a[1] * this.globalAlpha;
 
var W = 10;
var H = 10;
 
lineStr.push('<g_vml_:shape',
' fillcolor="', color, '"',
' filled="', Boolean(aFill), '"',
' style="position:absolute;width:', W, ';height:', H, ';"',
' coordorigin="0 0" coordsize="', Z * W, ' ', Z * H, '"',
' stroked="', !aFill, '"',
' strokeweight="', this.lineWidth, '"',
' strokecolor="', color, '"',
' path="');
 
var newSeq = false;
var min = {x: null, y: null};
var max = {x: null, y: null};
 
for (var i = 0; i < this.currentPath_.length; i++) {
var p = this.currentPath_[i];
 
if (p.type == "moveTo") {
lineStr.push(" m ");
var c = this.getCoords_(p.x, p.y);
lineStr.push(mr(c.x), ",", mr(c.y));
} else if (p.type == "lineTo") {
lineStr.push(" l ");
var c = this.getCoords_(p.x, p.y);
lineStr.push(mr(c.x), ",", mr(c.y));
} else if (p.type == "close") {
lineStr.push(" x ");
} else if (p.type == "bezierCurveTo") {
lineStr.push(" c ");
var c = this.getCoords_(p.x, p.y);
var c1 = this.getCoords_(p.cp1x, p.cp1y);
var c2 = this.getCoords_(p.cp2x, p.cp2y);
lineStr.push(mr(c1.x), ",", mr(c1.y), ",",
mr(c2.x), ",", mr(c2.y), ",",
mr(c.x), ",", mr(c.y));
} else if (p.type == "at" || p.type == "wa") {
lineStr.push(" ", p.type, " ");
var c = this.getCoords_(p.x, p.y);
var cStart = this.getCoords_(p.xStart, p.yStart);
var cEnd = this.getCoords_(p.xEnd, p.yEnd);
 
lineStr.push(mr(c.x - this.arcScaleX_ * p.radius), ",",
mr(c.y - this.arcScaleY_ * p.radius), " ",
mr(c.x + this.arcScaleX_ * p.radius), ",",
mr(c.y + this.arcScaleY_ * p.radius), " ",
mr(cStart.x), ",", mr(cStart.y), " ",
mr(cEnd.x), ",", mr(cEnd.y));
}
 
 
// TODO: Following is broken for curves due to
// move to proper paths.
 
// Figure out dimensions so we can do gradient fills
// properly
if(c) {
if (min.x == null || c.x < min.x) {
min.x = c.x;
}
if (max.x == null || c.x > max.x) {
max.x = c.x;
}
if (min.y == null || c.y < min.y) {
min.y = c.y;
}
if (max.y == null || c.y > max.y) {
max.y = c.y;
}
}
}
lineStr.push(' ">');
 
if (typeof this.fillStyle == "object") {
var focus = {x: "50%", y: "50%"};
var width = (max.x - min.x);
var height = (max.y - min.y);
var dimension = (width > height) ? width : height;
 
focus.x = mr((this.fillStyle.focus_.x / width) * 100 + 50) + "%";
focus.y = mr((this.fillStyle.focus_.y / height) * 100 + 50) + "%";
 
var colors = [];
 
// inside radius (%)
if (this.fillStyle.type_ == "gradientradial") {
var inside = (this.fillStyle.radius1_ / dimension * 100);
 
// percentage that outside radius exceeds inside radius
var expansion = (this.fillStyle.radius2_ / dimension * 100) - inside;
} else {
var inside = 0;
var expansion = 100;
}
 
var insidecolor = {offset: null, color: null};
var outsidecolor = {offset: null, color: null};
 
// We need to sort 'colors' by percentage, from 0 > 100 otherwise ie
// won't interpret it correctly
this.fillStyle.colors_.sort(function (cs1, cs2) {
return cs1.offset - cs2.offset;
});
 
for (var i = 0; i < this.fillStyle.colors_.length; i++) {
var fs = this.fillStyle.colors_[i];
 
colors.push( (fs.offset * expansion) + inside, "% ", fs.color, ",");
 
if (fs.offset > insidecolor.offset || insidecolor.offset == null) {
insidecolor.offset = fs.offset;
insidecolor.color = fs.color;
}
 
if (fs.offset < outsidecolor.offset || outsidecolor.offset == null) {
outsidecolor.offset = fs.offset;
outsidecolor.color = fs.color;
}
}
colors.pop();
 
lineStr.push('<g_vml_:fill',
' color="', outsidecolor.color, '"',
' color2="', insidecolor.color, '"',
' type="', this.fillStyle.type_, '"',
' focusposition="', focus.x, ', ', focus.y, '"',
' colors="', colors.join(""), '"',
' opacity="', opacity, '" />');
} else if (aFill) {
lineStr.push('<g_vml_:fill color="', color, '" opacity="', opacity, '" />');
} else {
lineStr.push(
'<g_vml_:stroke',
' opacity="', opacity,'"',
' joinstyle="', this.lineJoin, '"',
' miterlimit="', this.miterLimit, '"',
' endcap="', processLineCap(this.lineCap) ,'"',
' weight="', this.lineWidth, 'px"',
' color="', color,'" />'
);
}
 
lineStr.push("</g_vml_:shape>");
 
this.element_.insertAdjacentHTML("beforeEnd", lineStr.join(""));
 
this.currentPath_ = [];
};
 
contextPrototype.fill = function() {
this.stroke(true);
}
 
contextPrototype.closePath = function() {
this.currentPath_.push({type: "close"});
};
 
/**
* @private
*/
contextPrototype.getCoords_ = function(aX, aY) {
return {
x: Z * (aX * this.m_[0][0] + aY * this.m_[1][0] + this.m_[2][0]) - Z2,
y: Z * (aX * this.m_[0][1] + aY * this.m_[1][1] + this.m_[2][1]) - Z2
}
};
 
contextPrototype.save = function() {
var o = {};
copyState(this, o);
this.aStack_.push(o);
this.mStack_.push(this.m_);
this.m_ = matrixMultiply(createMatrixIdentity(), this.m_);
};
 
contextPrototype.restore = function() {
copyState(this.aStack_.pop(), this);
this.m_ = this.mStack_.pop();
};
 
contextPrototype.translate = function(aX, aY) {
var m1 = [
[1, 0, 0],
[0, 1, 0],
[aX, aY, 1]
];
 
this.m_ = matrixMultiply(m1, this.m_);
};
 
contextPrototype.rotate = function(aRot) {
var c = mc(aRot);
var s = ms(aRot);
 
var m1 = [
[c, s, 0],
[-s, c, 0],
[0, 0, 1]
];
 
this.m_ = matrixMultiply(m1, this.m_);
};
 
contextPrototype.scale = function(aX, aY) {
this.arcScaleX_ *= aX;
this.arcScaleY_ *= aY;
var m1 = [
[aX, 0, 0],
[0, aY, 0],
[0, 0, 1]
];
 
this.m_ = matrixMultiply(m1, this.m_);
};
 
/******** STUBS ********/
contextPrototype.clip = function() {
// TODO: Implement
};
 
contextPrototype.arcTo = function() {
// TODO: Implement
};
 
contextPrototype.createPattern = function() {
return new CanvasPattern_;
};
 
// Gradient / Pattern Stubs
function CanvasGradient_(aType) {
this.type_ = aType;
this.radius1_ = 0;
this.radius2_ = 0;
this.colors_ = [];
this.focus_ = {x: 0, y: 0};
}
 
CanvasGradient_.prototype.addColorStop = function(aOffset, aColor) {
aColor = processStyle(aColor);
this.colors_.push({offset: 1-aOffset, color: aColor});
};
 
function CanvasPattern_() {}
 
// set up externs
G_vmlCanvasManager = G_vmlCanvasManager_;
CanvasRenderingContext2D = CanvasRenderingContext2D_;
CanvasGradient = CanvasGradient_;
CanvasPattern = CanvasPattern_;
 
})();
 
} // if