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fanshaped.html
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<!DOCTYPE HTML>
<html>
<head>
<title> ²âÊÔÒ³ </title>
<meta charset="utf-8">
<style type="text/css">
</style>
</head>
<body>
<div id="canva">
<canvas width="1500" height="800" id="canvas"></canvas>
</div>
<script type="text/javascript">
function fanshaped(canvasId,obj){
var context=document.querySelector(canvasId);
if(context.getContext){
var con=context.getContext("2d");
}else{
return;
}
var value=obj['value'],color=obj['color'],x=obj['center'][0],y=obj['center'][1],len=value.length,radius=obj['radius'];
var angle=value.map(function(item,index,array){
var sum=array.reduce(function(prev,cur){
return prev+cur;
})
return item/sum;
});
var startAngle=0;
for(var i=0;i<len;i++){
con.beginPath();
con.moveTo(x,y);
con.fillStyle=color[i];
con.arc(x,y,radius,startAngle*Math.PI*2,(startAngle+angle[i])*Math.PI*2,false);
con.closePath();
con.fill();
fillFont(angle[i],startAngle,radius);
startAngle+=angle[i];
}
function fillFont(num,st,r){
con.save();
con.font="0.75rem Arial";
con.textAlign="center";
con.fillStyle="#000";
var text=(num*100).toFixed(2)+"%";
con.translate(x,y);
var angle=(st+num/2)*Math.PI*2;
var x1= Math.cos(angle)*r/2;
var y1= Math.sin(angle)*r/2;
con.fillText(text,x1,y1);
con.translate(0,0);
con.restore();
}
}
fanshaped("#canvas",{value:[25,42,13,16,15,20],color:["#f00","#fc0","#ce0","#faa","#dee","#aecb00"],center:[200,150],radius:150})
</script>
</body>
</html>