canvas径向渐变

来源:互联网 发布:营业部买卖数据 编辑:程序博客网 时间:2024/04/30 13:44
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>文字排版</title>
<script type="text/javascript">
     function  clearmap(){
     context.clearRect(0,0,300,200);
     }
</script>
</head>
<body>


<canvas id="canvas" width="700" height="300" style="border:1px solid"></canvas>
</body>
<script type="text/javascript">
function draw(){
var c=document.getElementById("canvas");
var context = c.getContext("2d");
   var radgrad = context.createRadialGradient(55,55,20,100,100,90);
   radgrad.addColorStop(0,'#ffffff');
   radgrad.addColorStop(1,'#333333');
   context.fillStyle=radgrad;
   context.fillRect(10,10,200,200);


}
window.onload=function(){
draw();
}




</script>
<input name="" type="button" value="清空画布" onclick="clearmap();">
</html>
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