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Viewing file:     excanvas.js (15.55 KB)      -rw-r--r--

// Copyright 2006 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// 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.

if(!document.createElement('canvas').getContext)
{(function(){

var m=Math;
var mr=m.round;
var ms=m.sin;
var mc=m.cos;
var max=m.max;
var abs=m.abs;
var sqrt=m.sqrt;
var Z=10;
var Z2=Z/2;
function getContext(){
return this.context_||(this.context_=new CanvasRenderingContext2D_(this));
}
var slice=Array.prototype.slice;
function bind(f,obj,var_args){
var a=slice.call(arguments,2);
return function(){
return f.apply(obj,a.concat(slice.call(arguments)));
};
}
var G_vmlCanvasManager_={
init:function(opt_doc){
if(((navigator.appName.search(/explorer/i) != -1) || (/MSIE/.test(navigator.userAgent)))&&!window.opera){
var doc=opt_doc||document;

doc.createElement('canvas');
doc.attachEvent('onreadystatechange',bind(this.init_,this,doc));
}
},init_:function(doc){
if(!doc.namespaces['g_vml_']){
doc.namespaces.add('g_vml_','urn:schemas-microsoft-com:vml');
}
if(!doc.styleSheets['ex_canvas_']){
var ss=doc.createStyleSheet();
ss.owningElement.id='ex_canvas_';
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++){
this.initElement(els[i]);
}
},
initElement:function(el){
if(!el.getContext){
el.getContext=getContext;
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.globalAlpha=o1.globalAlpha;
o2.arcScaleX_=o1.arcScaleX_;
o2.arcScaleY_=o1.arcScaleY_;
o2.lineScale_=o1.lineScale_;
}
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{color:str,alpha: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;
this.lineScale_=1;
}
var contextPrototype=CanvasRenderingContext2D_.prototype;
contextPrototype.clearRect=function(){
this.element_.innerHTML='';
this.currentPath_=[];
};
contextPrototype.beginPath=function(){

this.currentPath_=[];
};
contextPrototype.moveTo=function(aX,aY){
var p=this.getCoords_(aX,aY);
this.currentPath_.push({type:'moveTo',x:p.x,y:p.y});
this.currentX_=p.x;
this.currentY_=p.y;
};
contextPrototype.lineTo=function(aX,aY){
var p=this.getCoords_(aX,aY);
this.currentPath_.push({type:'lineTo',x:p.x,y:p.y});
this.currentX_=p.x;
this.currentY_=p.y;
};
contextPrototype.bezierCurveTo=function(aCP1x,aCP1y,aCP2x,aCP2y,aX,aY){
var p=this.getCoords_(aX,aY);
var cp1=this.getCoords_(aCP1x,aCP1y);
var cp2=this.getCoords_(aCP2x,aCP2y);
bezierCurveTo(this,cp1,cp2,p);
};
function bezierCurveTo(self,cp1,cp2,p){
self.currentPath_.push({
type:'bezierCurveTo',cp1x:cp1.x,cp1y:cp1.y,cp2x:cp2.x,cp2y:cp2.y,x:p.x,y:p.y
});
self.currentX_=p.x;
self.currentY_=p.y;
}
contextPrototype.quadraticCurveTo=function(aCPx,aCPy,aX,aY){

var cp=this.getCoords_(aCPx,aCPy);
var p=this.getCoords_(aX,aY);
var cp1={
x:this.currentX_+2.0/3.0*(cp.x-this.currentX_),y:this.currentY_+2.0/3.0*(cp.y-this.currentY_)
};
var cp2={
x:cp1.x+(p.x-this.currentX_)/3.0,y:cp1.y+(p.y-this.currentY_)/3.0
};
bezierCurveTo(this,cp1,cp2,p);
};
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;

}
var p=this.getCoords_(aX,aY);
var pStart=this.getCoords_(xStart,yStart);
var pEnd=this.getCoords_(xEnd,yEnd);
this.currentPath_.push({type:arcType,x:p.x,y:p.y,radius:aRadius,xStart:pStart.x,yStart:pStart.y,xEnd:pEnd.x,yEnd:pEnd.y});
};
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();
this.currentPath_=[];
};
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();
this.currentPath_=[];
};
contextPrototype.createLinearGradient=function(aX0,aY0,aX1,aY1){
var gradient=new CanvasGradient_('gradient');
gradient.x0_=aX0;
gradient.y0_=aY0;
gradient.x1_=aX1;
gradient.y1_=aY1;
return gradient;
};
contextPrototype.createRadialGradient=function(aX0,aY0,aR0,aX1,aY1,aR1){
var gradient=new CanvasGradient_('gradientradial');
gradient.x0_=aX0;
gradient.y0_=aY0;
gradient.r0_=aR0;
gradient.x1_=aX1;
gradient.y1_=aY1;
gradient.r1_=aR1;
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 Error('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=max(max.x,c2.x,c3.x,c4.x);
max.y=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;');
}
var tag="image"
vmlStr.push(' ">','<g_vml_:',tag,' 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,'"',
' >','</v:',tag,'>','</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.color;
var opacity=a.alpha*this.globalAlpha;
var W=10;
var H=10;
lineStr.push('<g_vml_:shape',' filled="',!!aFill,'"',' style="position:absolute;width:',W,';height:',H,';"',' coordorigin="0 0" coordsize="',Z*W,' ',Z*H,'"',' stroked="',!aFill,'"',' 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];
var c;
switch(p.type){
case 'moveTo':
c=p;
lineStr.push(' m ',mr(p.x),',',mr(p.y));
break;
case 'lineTo':
lineStr.push(' l ',mr(p.x),',',mr(p.y));
break;
case 'close':
lineStr.push(' x ');
p=null;
break;
case 'bezierCurveTo':
lineStr.push(' c ',mr(p.cp1x),',',mr(p.cp1y),',',mr(p.cp2x),',',mr(p.cp2y),',',mr(p.x),',',mr(p.y));
break;
case 'at':
case 'wa':
lineStr.push(' ',p.type,' ',mr(p.x-this.arcScaleX_*p.radius),',',mr(p.y-this.arcScaleY_*p.radius),' ',mr(p.x+this.arcScaleX_*p.radius),',',mr(p.y+this.arcScaleY_*p.radius),' ',mr(p.xStart),',',mr(p.yStart),' ',mr(p.xEnd),',',mr(p.yEnd));
break;
}



if(p){
if(min.x==null||p.x<min.x){
min.x=p.x;
}
if(max.x==null||p.x>max.x){
max.x=p.x;
}
if(min.y==null||p.y<min.y){
min.y=p.y;
}
if(max.y==null||p.y>max.y){
max.y=p.y;
}
}
}
lineStr.push(' ">');
if(!aFill){
var lineWidth=this.lineScale_*this.lineWidth;

if(lineWidth<1){
opacity*=lineWidth;
}
lineStr.push('<g_vml_:stroke',' opacity="',opacity,'"',' joinstyle="',this.lineJoin,'"',' miterlimit="',this.miterLimit,'"',' endcap="',processLineCap(this.lineCap),'"',' weight="',lineWidth,'px"',' color="',color,'" />');
}else
if(typeof this.fillStyle=='object')
{
var fillStyle=this.fillStyle;
var angle=0;
var focus={x:0,y:0};
var shift=0;
var expansion=1;

if(fillStyle.type_=='gradient')
{
var x0=fillStyle.x0_/this.arcScaleX_;
var y0=fillStyle.y0_/this.arcScaleY_;
var x1=fillStyle.x1_/this.arcScaleX_;
var y1=fillStyle.y1_/this.arcScaleY_;
var p0=this.getCoords_(x0,y0);
var p1=this.getCoords_(x1,y1);
var dx=p1.x-p0.x;
var dy=p1.y-p0.y;
angle=Math.atan2(dx,dy)*180/Math.PI;
if(angle<0)
{
angle+=360;
}

if(angle<1e-6)
{
angle=0;
}
}
else
if(this.fillStyle.type_pattern_=="Image")
{
var t=fillStyle.type_ 
var ws=max.x-min.x;
var hs=max.y-min.y;
if(t=="repeat")
{
var deltaleft=-min.x;
var deltatop=-min.y;
lineStr.push('<g_vml_:fill',
' position="',0,',',0,'"',' type="','tile','"',' src="',this.fillStyle.src,'" />');
}
else
{
var w=(this.canvas.clientWidth)*Z;
var h=(this.canvas.clientHeight)*Z;
var wi=this.fillStyle.width2*Z;
var hi=this.fillStyle.height2*Z;
var oleft=(ws-wi)/2+min.x;
var otop=(hs-hi)/2+min.y;
var vleft=(w-wi)/2;
var vtop=(h-hi)/2;
var deltaleft=vleft-oleft;
var deltatop=vtop-otop;
var left=deltaleft/ws;
var top=deltatop/hs;
lineStr.push('<g_vml_:fill',' position="',left,',',top,'"',' size="',wi/ws,',',hi/hs,'"',' alignshape="false"',' type="','frame','"',' type="','frame','"',' src="',this.fillStyle.src,'" />');
}
}
else
{
var p0=this.getCoords_(fillStyle.x0_,fillStyle.y0_);
var width=max.x-min.x;
var height=max.y-min.y;
focus={
x:(p0.x-min.x)/width,y:(p0.y-min.y)/height
};
width/=this.arcScaleX_*Z;
height/=this.arcScaleY_*Z;
var dimension=width>height?width:height;
shift=2*fillStyle.r0_/dimension;
expansion=2*fillStyle.r1_/dimension-shift;
}
if(this.fillStyle.type_pattern_!="Image")
{

var stops=fillStyle.colors_;
stops.sort(function(cs1,cs2){
return cs1.offset-cs2.offset;
});
var length=stops.length;
var color1=stops[0].color;
var color2=stops[length-1].color;
var opacity1=stops[0].alpha*this.globalAlpha;
var opacity2=stops[length-1].alpha*this.globalAlpha;
var colors=[];
for(var i=0;i<length;i++){
var stop=stops[i];
colors.push(stop.offset*expansion+shift+' '+stop.color);
}

lineStr.push('<g_vml_:fill type="',fillStyle.type_,'"',' method="none" focus="100%"',' color="',color1,'"',' color2="',color2,'"',' colors="',colors.join(','),'"',' opacity="',opacity2,'"',' o:opacity2="',opacity1,'"',' angle="',angle,'"',' focusposition="',focus.x,',',focus.y,'" />');
}
}else
{
lineStr.push('<g_vml_:fill color="',color,'" opacity="',opacity,'" />');
}
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){
var m=this.m_;
return{
x:Z*(aX*m[0][0]+aY*m[1][0]+m[2][0])-Z2,y:Z*(aX*m[0][1]+aY*m[1][1]+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]
];
var m=this.m_=matrixMultiply(m1,this.m_);



var det=m[0][0]*m[1][1]-m[0][1]*m[1][0];
this.lineScale_=sqrt(abs(det));
};
contextPrototype.clip=function(){
};
contextPrototype.arcTo=function(){
};
contextPrototype.createPattern=function(img,type){
return new CanvasPattern_(img,type);
};
function CanvasGradient_(aType){
this.type_=aType;
this.x0_=0;
this.y0_=0;
this.r0_=0;
this.x1_=0;
this.y1_=0;
this.r1_=0;
this.colors_=[];
}
CanvasGradient_.prototype.addColorStop=function(aOffset,aColor){
aColor=processStyle(aColor);
this.colors_.push({offset:aOffset,color:aColor.color,alpha:aColor.alpha});
};
function CanvasPattern_(img,type){
this.type_=type;
this.type_pattern_="Image";
this.src=img.src;
this.width=img.width;
this.height=img.height;
this.width2=img.width;
this.height2=img.height;
}

G_vmlCanvasManager=G_vmlCanvasManager_;
CanvasRenderingContext2D=CanvasRenderingContext2D_;
CanvasGradient=CanvasGradient_;
CanvasPattern=CanvasPattern_;
})();
}