Canvas get/putImageData

时间：2023-03-09 05:03:32
Canvas get/putImageData 
<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>get/putImageData</title>

</head>

<body>

    <canvas id='myCanvas' width='800' height='400'>

        your browser does not support canvas

    </canvas>

    <script type="text/javascript">

    var c = document.getElementById('myCanvas');

    var cxt = c.getContext('2d');

    var img = new Image();

    img.src = 'face.jpg';

    img.onload = function() {

        // 从10,10坐标开始绘制整个图片

        cxt.drawImage(img, 10, 10);

        // 获取从50,50到200,200的区域

        var imgData = cxt.getImageData(50,50,200,200);

        // 将获得的整个像素绘制到10,260开始的Canvas上面

        cxt.putImageData(imgData,10,260);

        // 将取得的一部分像素(从50,50开始宽高为100,100)，

        // 绘制到200,260开始的Canvas上面

        cxt.putImageData(imgData,200,260,50,50,100,100);

    };

    </script>

</body>

</html>

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