html5-canvas中使用clip抠出一个区域的示例代码
本想在一个fillRect中抠出一个区域来给我用的，这个是在学clip方法的时候用到的
但是怎么也弄不出扣的区域，代码如下
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<canvas id="canvas" width="800" height="600"></canvas>
</body>
<script type="text/javascript">
var canvas = document.getElementById("canvas");
var context = canvas.getContext("2d");
context.fillStyle = "lightgreen";
context.fillRect(0, 0, canvas.width, canvas.height);
context.beginPath();
context.fillRect(100, 100, 200, 100);
context.clip();
context.closePath();
context.fillStyle = "lightblue";
context.fillRect(0, 0, canvas.width, canvas.height);
</script>
</html>
发现如果要抠出一个新的路径的话应该使用rect、arc等方法
所有应该在改为
context.beginPath();
context.rect(100, 100, 200, 100);
context.clip();
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