Home >Web Front-end >HTML Tutorial >Using the clip() function to crop in canvas

Using the clip() function to crop in canvas

小云云Original: 2018-03-03 10:13:501923browse

In canvas, you can use the clip() function to crop the area. After setting the cropping area, only the image within the area can be displayed, and the rest will be blocked. This article mainly introduces you to the relevant information on the specific use of the canvas clipping () function. I hope it can help you.

Draw a circle without clipping

<!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(&#39;canvas&#39;),  
            context = canvas.getContext(&#39;2d&#39;);  
        canvas.width = document.body.clientWidth;  
        canvas.height = document.body.clientHeight;  
        context.lineWidth = 3;  
        context.strokeStyle = &#39;red&#39;;  
        context.beginPath();  
        context.arc(200, 200, 100, (Math.PI / 180) * 0, (Math.PI / 180) * 360, false);  
        context.stroke();  
        context.closePath();  
    </script>  
</body>  
</html>

Effect

Use clip() to crop the area

<!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(&#39;canvas&#39;),  
            context = canvas.getContext(&#39;2d&#39;);  
        canvas.width = document.body.clientWidth;  
        canvas.height = document.body.clientHeight;  
        context.lineWidth = 3;  
        context.strokeStyle = &#39;red&#39;;  
        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>

Effect

can also be used arc draws a circular clipping area

<!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(&#39;canvas&#39;),  
            context = canvas.getContext(&#39;2d&#39;);  
        canvas.width = document.body.clientWidth;  
        canvas.height = document.body.clientHeight;  
        context.lineWidth = 3;  
        context.strokeStyle = &#39;red&#39;;  
        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>

Effect

Use save and restore to achieve Only crop a single path

<!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(&#39;canvas&#39;),  
            context = canvas.getContext(&#39;2d&#39;);  
        canvas.width = document.body.clientWidth;  
        canvas.height = document.body.clientHeight;  
        context.lineWidth = 3;  
        context.strokeStyle = &#39;red&#39;;  
        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>

Effect

Related recommendations:

Use the clip() method in the HTML5 Canvas API to crop an area image code example

The above is the detailed content of Using the clip() function to crop in canvas. For more information, please follow other related articles on the PHP Chinese website!

html5 canvas

Statement：

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Previous article：MUI framework uses HTML5 to implement QR code scanning functionNext article：MUI framework uses HTML5 to implement QR code scanning function

See more

Using the clip() function to crop in canvas

Related articles