在canvas中,可以使用clip()函数裁剪区域,设定裁剪区域后,只有在区域内的图像才能显示,其余部分会被屏蔽掉
未使用裁剪 绘制 一个 圆
<!DOCTY PE ht ML >
<html lang="en">
<head>
< ;m eta charset="UTF-8">
<t IT le></title>
<style>
*{m arg in:0; padding:0;}
html, body{width:100%; h ei ght:100%; overflow:hidden; background-color: # AFAFAF;}
</style>
</head>
<body>
<canvas id="canvas"></canvas>
<script>
VAR canvas = document.getElementById('canvas'),
context = canvas.getContext('2d');
canvas.width = document.body.clientWidth;
canvas.height = document.body.clientHeight;
context.lineWidth = 3;
context. stroke Style = ' red ';
context.be gin Path();
context.arc(200, 200, 100, (Math.PI / 180) * 0, (Math.PI / 180) * 360 , false);
context.stroke();
context.closePath();
</script>
</body>
</html>
效果
使用clip()裁剪区域
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<style>
*{margin:0; padding:0;}
html, body{width:100%; height:100%; overflow:hidden; background-color:#AFAFAF;}
</style>
</head>
<body>
<canvas id="canvas"></canvas>
<script>
var canvas = document.getElementById('canvas'),
context = canvas.getContext('2d');
canvas.width = document.body.clientWidth;
canvas.height = document.body.clientHeight;
context.lineWidth = 3;
context.strokeStyle = 'red';
context.rect(0, 0, 200, 200);
context.clip();
context.beginPath();
context.arc(200, 200, 100, (Math.PI / 180) * 0, (Math.PI / 180) * 360, false);
context.stroke();
context.closePath();
</script>
</body>
</html>
效果
也可以使用arc绘制圆形的剪裁区域
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<style>
*{margin:0; padding:0;}
html, body{width:100%; height:100%; overflow:hidden; background-color:#AFAFAF;}
</style>
</head>
<body>
<canvas id="canvas"></canvas>
<script>
var canvas = document.getElementById('canvas'),
context = canvas.getContext('2d');
canvas.width = document.body.clientWidth;
canvas.height = document.body.clientHeight;
context.lineWidth = 3;
context.strokeStyle = 'red';
context.arc(100, 100, 150, (Math.PI / 180) * 0, (Math.PI / 180) * 360, false);
context.clip();
context.beginPath();
context.arc(200, 200, 100, (Math.PI / 180) * 0, (Math.PI / 180) * 360, false);
context.stroke();
context.closePath();
</script>
</body>
</html>
效果
使用save和re Store 实现只裁剪单个路径
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<style>
*{margin:0; padding:0;}
html, body{width:100%; height:100%; overflow:hidden; background-color:#AFAFAF;}
</style>
</head>
<body>
<canvas id="canvas"></canvas>
<script>
var canvas = document.getElementById('canvas'),
context = canvas.getContext('2d');
canvas.width = document.body.clientWidth;
canvas.height = document.body.clientHeight;
context.lineWidth = 3;
context.strokeStyle = 'red';
context.save();
context.rect(0, 0, 200, 200);
context.clip();
context.beginPath();
context.arc(200, 200, 100, (Math.PI / 180) * 0, (Math.PI / 180) * 360, false);
context.stroke();
context.closePath();
context.restore();
context.beginPath();
context.arc(250, 250, 100, (Math.PI / 180) * 0, (Math.PI / 180) * 360, false);
context.stroke();
context.closePath();
</script>
</body>
</html>
效果
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总结
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