Canvas贝塞尔二级曲线

当前点到控制点，控制点到末尾点的两个连线，与这两个连线相切；
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>quadraticCurveTo</title>
</head>

<body>
    <canvas id='myCanvas' width='200' height='100'>
        your browser does not support canvas
    </canvas>
    <script type="text/javascript">
    var c = document.getElementById('myCanvas');
    var cxt = c.getContext('2d');
    cxt.beginPath();
    cxt.moveTo(20, 100);
    cxt.quadraticCurveTo(60, 50, 100, 100);
    cxt.lineTo(60, 50);
    cxt.lineTo(20, 100);
    cxt.stroke();
    </script>
</body>

</html>
Canvas贝塞尔二级曲线

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