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jquery.excanvas.pack.js：源码内容
							if(!window.CanvasRenderingContext2D){(function(){var m=Math;var mr=m.round;var ms=m.sin;var mc=m.cos;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"){if(!doc.namespaces["g_vml_"]){doc.namespaces.add("g_vml_","urn:schemas-microsoft-com:vml")}var ss=doc.createStyleSheet();ss.cssText="canvas{display:inline-block;overflow:hidden;"+"text-align:left;width:300px;height:150px}"+"g_vml_\:*{behavior:url(#default#VML)}";var els=doc.getElementsByTagName("canvas");for(var i=0;i<els.length;i++){if(!els[i].getContext){this.initElement(els[i])}}}},fixElement_:function(el){var outerHTML=el.outerHTML;var newEl=el.ownerDocument.createElement(outerHTML);if(outerHTML.slice(-2)!="/>"){var tagName="/"+el.tagName;var ns;while((ns=el.nextSibling)&&ns.tagName!=tagName){ns.removeNode()}if(ns){ns.removeNode()}}el.parentNode.replaceChild(newEl,el);return newEl},initElement:function(el){el=this.fixElement_(el);el.getContext=function(){if(this.context_){return this.context_}return this.context_=new CanvasRenderingContext2D_(this)};el.attachEvent('onpropertychange',onPropertyChange);el.attachEvent('onresize',onResize);var attrs=el.attributes;if(attrs.width&&attrs.width.specified){el.style.width=attrs.width.nodeValue+"px"}else{el.width=el.clientWidth}if(attrs.height&&attrs.height.specified){el.style.height=attrs.height.nodeValue+"px"}else{el.height=el.clientHeight}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();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"}}function CanvasRenderingContext2D_(surfaceElement){this.m_=createMatrixIdentity();this.mStack_=[];this.aStack_=[];this.currentPath_=[];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(){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){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;if(xStart==xEnd&&!aClockwise){xStart+=0.125}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){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){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;var oldRuntimeWidth=image.runtimeStyle.width;var oldRuntimeHeight=image.runtimeStyle.height;image.runtimeStyle.width='auto';image.runtimeStyle.height='auto';var w=image.width;var h=image.height;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;vmlStr.push(' <g_vml_:group',' coordsize="',Z*W,',',Z*H,'"',' coordorigin="0,0"',' style="width:',W,';height:',H,';position:absolute;');if(this.m_[0][0]!=1||this.m_[0][1]){var filter=[];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),"'");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))}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=[];if(this.fillStyle.type_=="gradientradial"){var inside=(this.fillStyle.radius1_/dimension*100);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};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(""))};contextPrototype.fill=function(){this.stroke(true)};contextPrototype.closePath=function(){this.currentPath_.push({type:"close"})};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_)};contextPrototype.clip=function(){};contextPrototype.arcTo=function(){};contextPrototype.createPattern=function(){return new CanvasPattern_};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_(){}G_vmlCanvasManager=G_vmlCanvasManager_;CanvasRenderingContext2D=CanvasRenderingContext2D_;CanvasGradient=CanvasGradient_;CanvasPattern=CanvasPattern_})()}

						