canvas基础—02绘制其他曲线-蒲公英云

canvas基础—02绘制其他曲线

1.绘制其他曲线

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arcTo(x1,y1,x2,y2,r)

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<!DOCTYPE html>
<html>
<head> 
<meta charset="utf-8"> 
<title>canvas学习</title>
<style>
body{background: black}
#c1{background: white}
span{color: white}
</style> 
<script type="text/javascript">
    window.onload = function(){
        var oC = document.getElementById('c1');
        var oGC = oC.getContext('2d');
        oGC.moveTo(100,200)
        oGC.arcTo(100,100,200,100,50)
        oGC.stroke()
    }
</script>
</head>
<body>
<canvas id="c1" width="400" height="400">
    <span>不支持canvas浏览器</span>
</canvas>
</body>
</html>

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贝塞尔曲线quadraticCurveTo(第一组控制点，第二组结束坐标)

<!DOCTYPE html>
<html>
<head> 
<meta charset="utf-8"> 
<title>canvas学习</title>
<style>
body{background: black}
#c1{background: white}
span{color: white}
</style> 
<script type="text/javascript">
    window.onload = function(){
        var oC = document.getElementById('c1');
        var oGC = oC.getContext('2d');
        oGC.moveTo(100,200)//初始点
        // quadraticCurveTo(第一组控制点，第二组控制点)
        oGC.quadraticCurveTo(100,100,200,100)
        oGC.stroke()
    }
</script>
</head>
<body>
<canvas id="c1" width="400" height="400">
    <span>不支持canvas浏览器</span>
</canvas>
</body>
</html>