VML实现的饼图（JavaScript类封装）

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该博客提供了使用JavaScript和VML实现饼图的代码。定义了VMLPie类，包含添加数据、绘制、缩放等方法，可设置饼图的背景、边框、阴影等样式，还实现了图例显示和鼠标交互效果，最后给出了函数调用示例。

代码如下：
<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office"> <head> <title>VML实现的饼图（JavaScript类封装）</title> <meta name="GENERATOR" content="Microsoft Visual Studio .NET 7.1"> <meta name="ProgId" content="VisualStudio.HTML"> <meta name="Originator" content="Microsoft Visual Studio .NET 7.1"> <STYLE>v/:* { BEHAVIOR: url(#default#VML) } o/:* { BEHAVIOR: url(#default#VML) } .shape { BEHAVIOR: url(#default#VML) } </STYLE> <script language="javascript"> function Add(){ var shape=document.createElement("v:shape"); shape.type="#tooltipshape"; shape.style.width="150px"; shape.style.height="150px"; shape.coordsize="21600,21600"; shape.fillcolor="infobackground"; var textbox=document.createElement("v:textbox"); textbox.style.border="1px solid red"; textbox.style.innerHTML="测试"; shape.appendChild(textbox); document.body.appendChild(shape); } function VMLPie(pContainer,pWidth,pHeight,pCaption){ this.Container=pContainer; this.Width= pWidth || "400px"; this.Height=pHeight || "250px"; this.Caption = pCaption || "VML Chart"; this.backgroundColor=""; this.Shadow=false; this.BorderWidth=0; this.BorderColor=null; this.all=new Array(); this.RandColor=function(){ return "rgb("+ parseInt( Math.random() * 255) +"," +parseInt( Math.random() * 255) +"," +parseInt( Math.random() * 255)+")"; } this.VMLObject=null; } VMLPie.prototype.Draw=function(){ //画外框 var o=document.createElement("v:group"); o.style.width=this.Width; o.style.height=this.Height; o.coordsize="21600,21600"; //添加一个背景层 var vRect=document.createElement("v:rect"); vRect.style.width="21600px" vRect.style.height="21600px" o.appendChild(vRect); var vCaption=document.createElement("v:textbox"); vCaption.style.fontSize="24px"; vCaption.style.height="24px" vCaption.style.fontWeight="bold"; vCaption.innerHTML=this.Caption; vCaption.style.textAlign="center"; vRect.appendChild(vCaption); //设置边框大小 if(this.BorderWidth){ vRect.strokeweight=this.BorderWidth; } //设置边框颜色 if(this.BorderColor){ vRect.strokecolor=this.BorderColor; } //设置背景颜色 if(this.backgroundColor){ vRect.fillcolor=this.backgroundColor; } //设置是否出现阴影 if(this.Shadow){ var vShadow=document.createElement("v:shadow"); vShadow.on="t"; vShadow.type="single"; vShadow.color="graytext"; vShadow.offset="4px,4px"; vRect.appendChild(vShadow); } this.VMLObject=o; this.Container.appendChild(o); //开始画内部园 var oOval=document.createElement("v:oval"); oOval.style.width="15000px"; oOval.style.height="14000px"; oOval.style.top="4000px"; oOval.style.left="1000px"; oOval.fillcolor="#d5dbfb"; //本来计划加入3D的效果，后来感觉确实不好控制，就懒得动手了 //var o3D=document.createElement("o:extrusion"); var formatStyle=' <v:fill rotate="t" angle="-135" focus="100%" type="gradient"/>'; //formatStyle+='<o:extrusion v:ext="view" color="#9cf" on="t" rotationangle="-15"'; //formatStyle+=' viewpoint="0,34.72222mm" viewpointorigin="0,.5" skewangle="105"'; //formatStyle+=' lightposition="0,50000" lightposition2="0,-50000"/>'; formatStyle+='<o:extrusion v:ext="view" backdepth="1in" on="t" viewpoint="0,34.72222mm" viewpointorigin="0,.5" skewangle="90" lightposition="-50000" lightposition2="50000" type="perspective"/>'; oOval.innerHTML=formatStyle; o.appendChild(oOval); this.CreatePie(o); } VMLPie.prototype.CreatePie=function(vGroup){ var mX=Math.pow(2,16) * 360; //这个参数是划图形的关键 //AE x y width height startangle endangle //x y表示圆心位置 //width height形状的大小 //startangle endangle的计算方法如下 // 2^16 * 度数 var vTotal=0; var startAngle=0; var endAngle=0; var pieAngle=0; var prePieAngle=0; var objRow=null; var objCell=null; for(i=0;i<this.all.length;i++){ vTotal+=this.all[i].Value; } var objLegendRect=document.createElement("v:rect"); var objLegendTable=document.createElement("table"); objLegendTable.cellPadding=0; objLegendTable.cellSpacing=3; objLegendTable.width="100%"; with(objLegendRect){ style.left="17000px"; style.top="4000px"; style.width="4000px"; style.height="12000px"; fillcolor="#e6e6e6"; strokeweight="1px"; } objRow=objLegendTable.insertRow(); objCell=objRow.insertCell(); objCell.colSpan="2"; //objCell.style.border="1px outset"; objCell.style.backgroundColor="black"; objCell.style.padding="5px"; objCell.style.color="window"; objCell.style.font="caption"; objCell.innerText="总数:"+vTotal; var vTextbox=document.createElement("v:textbox"); vTextbox.appendChild(objLegendTable); objLegendRect.appendChild(vTextbox); var vShadow=document.createElement("v:shadow"); vShadow.on="t"; vShadow.type="single"; vShadow.color="graytext"; vShadow.offset="2px,2px"; objLegendRect.appendChild(vShadow); vGroup.appendChild(objLegendRect); var strAngle=""; for(i=0;i<this.all.length;i++){ //顺序的划出各个饼图 var vPieEl=document.createElement("v:shape"); var vPieId=document.uniqueID; vPieEl.style.width="15000px"; vPieEl.style.height="14000px"; vPieEl.style.top="4000px"; vPieEl.style.left="1000px"; vPieEl.coordsize="1500,1400"; vPieEl.strokecolor="white"; vPieEl.id=vPieId; pieAngle= this.all[i].Value / vTotal; startAngle+=prePieAngle; prePieAngle=pieAngle; endAngle=pieAngle; //strAngle+=this.all[i].Name +":" +this.all[i].Value+ " Start:"+startAngle +" End:"+ endAngle +"/n"; vPieEl.path="M 750 700 AE 750 700 750 700 " + parseInt(mX * startAngle) +" " + parseInt(mX * endAngle) +" xe"; vPieEl.title=this.all[i].Name +"/n所占比例:"+ endAngle * 100 +"%/n详细描述:" +this.all[i].TooltipText; //vPieEl.innerHTML='<v:fill rotate="t" angle="-135" focus="100%" type="gradient"/>'; var objFill=document.createElement("v:fill"); objFill.rotate="t"; objFill.focus="100%"; objFill.type="gradient"; objFill.angle=parseInt( 360 * (startAngle + endAngle /2)); vPieEl.appendChild(objFill); var objTextbox=document.createElement("v:textbox"); objTextbox.border="1px solid black"; objTextbox.innerHTML=this.all[i].Name +":" + this.all[i].Value; //vPieEl.appendChild(objTextbox); var vColor=this.RandColor(); vPieEl.fillcolor=vColor; //设置颜色 //开始画图例 objRow=objLegendTable.insertRow(); objRow.style.height="16px"; var objColor=objRow.insertCell();//颜色标记 objColor.style.backgroundColor=vColor; objColor.style.width="16px"; objColor.PieElement=vPieId; objColor.attachEvent("onmouseover",LegendMouseOverEvent); objColor.attachEvent("onmouseout",LegendMouseOutEvent); //objColor.onmouseover="LegendMouseOverEvent()"; //objColor.onmouseout="LegendMouseOutEvent()"; objCell=objRow.insertCell(); objCell.style.font="icon"; objCell.style.padding="3px"; objCell.innerText=this.all[i].Name +":"+this.all[i].Value ; vGroup.appendChild(vPieEl); } } VMLPie.prototype.Refresh=function(){ } VMLPie.prototype.Zoom=function (iValue){ var vX=21600; var vY=21600; this.VMLObject.coordsize=parseInt(vX / iValue) +","+parseInt(vY /iValue); } VMLPie.prototype.AddData=function(sName,sValue,sTooltipText){ var oData=new Object(); oData.Name=sName; oData.Value=sValue; oData.TooltipText=sTooltipText; var iCount=this.all.length; this.all[iCount]=oData; } VMLPie.prototype.Clear=function(){ this.all.length=0; } function LegendMouseOverEvent(){ var eSrc=window.event.srcElement; eSrc.border="1px solid black"; } function LegendMouseOutEvent(){ var eSrc=window.event.srcElement; eSrc.border=""; } var objPie=null; //以下是函数调用 function DrawPie(){ objPie=new VMLPie(document.body,"600px","450px","人口统计图"); //objPie.BorderWidth=3; //objPie.BorderColor="blue"; //objPie.Width="800px"; //objPie.Height="600px"; objPie.backgroundColor="#ffffff"; objPie.Shadow=true; objPie.AddData("北京",10,"北京的人口"); objPie.AddData("上海",52,"上海的固定人口"); objPie.AddData("天津",30,"天津的外地人口"); objPie.AddData("西安",58,"西安城市人口"); objPie.AddData("武汉",30,"武汉的外地人口"); objPie.AddData("重庆",58,"重庆城市人口"); objPie.Draw(); //alert(document.body.outerHTML); } </script> </head> <body onload="DrawPie()"> <v:shapetype id="tooltipshape" coordsize="21600,21600" o:spt="106" path=" ar0,7165,4345,13110,1950,7185,1080,12690 at475,11732,4835,17650,1080,12690,2910,17640 at2387,9757,10107,20300,2910,17640,8235,19545 at7660,12382,14412,21597,8235,19545,14280,18330 at12910,11080,18695,18947,14280,18330,18690,15045 at14822,5862,21597,15082,18690,15045,20895,7665 at15772,2592,21105,9865,20895,7665,19140,2715 at14330,0,19187,6595,19140,2715,14910,1170 at10992,0,15357,5945,14910,1170,11250,1665 at6692,650,12025,7917,11250,1665,7005,2580 at1912,1972,8665,11162,7005,2580,1950,7185 x e ar0,7165,4345,13110,1080,12690,2340,13080 nf e ar475,11732,4835,17650,2910,17640,3465,17445 nf e ar7660,12382,14412,21597,7905,18675,8235,19545 nf e ar7660,12382,14412,21597,14280,18330,14400,17370 nf e ar12910,11080,18695,18947,18690,15045,17070,11475 nf e ar15772,2592,21105,9865,20175,9015,20895,7665 nf e ar14330,0,19187,6595,19200,3345,19140,2715 nf e ar14330,0,19187,6595,14910,1170,14550,1980 nf e ar10992,0,15357,5945,11250,1665,11040,2340 nf e ar1912,1972,8665,11162,7650,3270,7005,2580 nf e ar1912,1972,8665,11162,1950,7185,2070,7890 nf e m@23@37 qx@35@24@23@36@34@24@23@37 x e m@16@33 qx@31@17@16@32@30@17@16@33 x e m@38@29 qx@27@39@38@28@26@39@38@29 x e" adj="1350,25920"> <v:formulas> <v:f eqn="sum #0 0 10800 "></v:f> <v:f eqn="sum #1 0 10800 "></v:f> <v:f eqn="cosatan2 10800 @0 @1 "></v:f> <v:f eqn="sinatan2 10800 @0 @1 "></v:f> <v:f eqn="sum @2 10800 0 "></v:f> <v:f eqn="sum @3 10800 0 "></v:f> <v:f eqn="sum @4 0 #0 "></v:f> <v:f eqn="sum @5 0 #1 "></v:f> <v:f eqn="mod @6 @7 0 "></v:f> <v:f eqn="prod 600 11 1 "></v:f> <v:f eqn="sum @8 0 @9 "></v:f> <v:f eqn="prod @10 1 3 "></v:f> <v:f eqn="prod 600 3 1 "></v:f> <v:f eqn="sum @11 @12 0 "></v:f> <v:f eqn="prod @13 @6 @8 "></v:f> <v:f eqn="prod @13 @7 @8 "></v:f> <v:f eqn="sum @14 #0 0 "></v:f> <v:f eqn="sum @15 #1 0 "></v:f> <v:f eqn="prod 600 8 1 "></v:f> <v:f eqn="prod @11 2 1 "></v:f> <v:f eqn="sum @18 @19 0 "></v:f> <v:f eqn="prod @20 @6 @8 "></v:f> <v:f eqn="prod @20 @7 @8 "></v:f> <v:f eqn="sum @21 #0 0 "></v:f> <v:f eqn="sum @22 #1 0 "></v:f> <v:f eqn="prod 600 2 1 "></v:f> <v:f eqn="sum #0 600 0 "></v:f> <v:f eqn="sum #0 0 600 "></v:f> <v:f eqn="sum #1 600 0 "></v:f> <v:f eqn="sum #1 0 600 "></v:f> <v:f eqn="sum @16 @25 0 "></v:f> <v:f eqn="sum @16 0 @25 "></v:f> <v:f eqn="sum @17 @25 0 "></v:f> <v:f eqn="sum @17 0 @25 "></v:f> <v:f eqn="sum @23 @12 0 "></v:f> <v:f eqn="sum @23 0 @12 "></v:f> <v:f eqn="sum @24 @12 0 "></v:f> <v:f eqn="sum @24 0 @12 "></v:f> <v:f eqn="sum #0 0 0 "></v:f> <v:f eqn="sum #1 0 0 "></v:f> </v:formulas> <v:path o:connectlocs="67,10800;10800,21577;21582,10800;10800,1235;@38,@39" o:extrusionok="f" o:connecttype="custom" textboxrect="2977,3262,17087,17337"></v:path> <v:handles> <v:h position="#0,#1"></v:h> </v:handles> <o:complex v:ext="view"></o:complex> </v:shapetype> <select id="zoom" onchange="objPie.Zoom(this.value)"> <option value ="0.2" selected=true>20%</option> <option value ="0.25">25%</option> <option value ="0.4">40%</option> <option value ="0.5">50%</option> <option value ="0.75">75%</option> <option value ="0.8">80%</option> <option value ="1">原始大小</option> <option value ="1.25">125%</option> <option value ="1.5">150%</option> <option value ="2">200%</option> <option value ="3">300%</option> <option value ="4">400%</option> </select> </body> </html>
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