canvas 绘制三次贝塞尔曲线

代码：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>canvas</title>
    <script>
        function init() {

            var canvas=document.getElementById('canvas');
            var ctx=canvas.getContext('2d');
            ctx.strokeStyle="dark";
            ctx.beginPath();
            ctx.moveTo(0,200);
            ctx.bezierCurveTo(25,50,75,50,300,200);
            ctx.stroke()

            ctx.strokeStyle="blue";
            ctx.beginPath();
            ctx.moveTo(25,50);
            ctx.lineTo(0,200);
            ctx.moveTo(75,50);
            ctx.lineTo(300,200);
            ctx.stroke();
        }
    </script>
</head>
<body  onload="init();">
<canvas  id="canvas"  width="400"   height="400"></canvas>
</body>
</html>

　　效果：

 

 

 

2017-09-09  11:40:50

posted @ 2017-09-09 11:42  1点  阅读(962)  评论(0)  编辑  收藏  举报