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這篇文章主要為大家展示了“canvas中如何使用clip()函數(shù)裁剪方法”,內(nèi)容簡而易懂,條理清晰,希望能夠幫助大家解決疑惑,下面讓小編帶領(lǐng)大家一起研究并學(xué)習(xí)一下“canvas中如何使用clip()函數(shù)裁剪方法”這篇文章吧。
未使用裁剪繪制一個(gè)圓
<!DOCTYPEhtml>
<htmllang="en">
<head>
<metacharset="UTF-8">
<title></title>
<style>
*{margin:0;padding:0;}
html,body{width:100%;height:100%;overflow:hidden;background-color:#AFAFAF;}
</style>
</head>
<body>
<canvasid="canvas"></canvas>
<script>
varcanvas=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()裁剪區(qū)域
<!DOCTYPEhtml>
<htmllang="en">
<head>
<metacharset="UTF-8">
<title></title>
<style>
*{margin:0;padding:0;}
html,body{width:100%;height:100%;overflow:hidden;background-color:#AFAFAF;}
</style>
</head>
<body>
<canvasid="canvas"></canvas>
<script>
varcanvas=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繪制圓形的剪裁區(qū)域
<!DOCTYPEhtml>
<htmllang="en">
<head>
<metacharset="UTF-8">
<title></title>
<style>
*{margin:0;padding:0;}
html,body{width:100%;height:100%;overflow:hidden;background-color:#AFAFAF;}
</style>
</head>
<body>
<canvasid="canvas"></canvas>
<script>
varcanvas=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實(shí)現(xiàn)只裁剪單個(gè)路徑
<!DOCTYPEhtml>
<htmllang="en">
<head>
<metacharset="UTF-8">
<title></title>
<style>
*{margin:0;padding:0;}
html,body{width:100%;height:100%;overflow:hidden;background-color:#AFAFAF;}
</style>
</head>
<body>
<canvasid="canvas"></canvas>
<script>
varcanvas=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>
以上是“canvas中如何使用clip()函數(shù)裁剪方法”這篇文章的所有內(nèi)容,感謝各位的閱讀!相信大家都有了一定的了解,希望分享的內(nèi)容對大家有所幫助,如果還想學(xué)習(xí)更多知識,歡迎關(guān)注億速云行業(yè)資訊頻道!
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