canvas基础—02绘制其他曲线
1.绘制其他曲线
arcTo(x1,y1,x2,y2,r)
<!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>
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>bezierCurveTo（不做介绍）