这期内容当中小编将会给大家带来有关如何正确的使用canvas裁剪函数clip()，文章内容丰富且以专业的角度为大家分析和叙述，阅读完这篇文章希望大家可以有所收获。
未使用裁剪绘制一个圆
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<!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.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restore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
上述就是小编为大家分享的如何正确的使用canvas裁剪函数clip()了，如果刚好有类似的疑惑，不妨参照上述分析进行理解。如果想知道更多相关知识，欢迎关注亿速云行业资讯频道。
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原文链接：https://www.jb51.net/html5/601756.html
