老师，请问怎么把图片放中间的XY分别是多少，怎么算出？

来源：6-6 编程练习

qq_慕移动3101913

2020-03-02 16:52:00

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>canvas图片</title>
    <style>
        canvas{background-color:lightblue;}
    </style>
</head>
<body>
    <canvas id="canvas" width="800px" height="800px">您的浏览器不支持canvas
    </canvas>
    <script>
        var canvas=document.getElementById("canvas");
        var context=canvas.getContext('2d');
        //此处填充代码
        context.fillStyle = 'RGB(125,114,99)';
        context.arc(400,400,150,0,Math.PI * 2,true);
        context.fill();

        var img = new Image();
            img.src = "http://climg.mukewang.com/59a7df40000165fa06000600.jpg";

            img.onload = function(){
                context.drawImage(img, 200, 0, 250,240,400, 400, 200,200);
            }
    </script>
</body>
</html>

按自己的理解，一直不到中心位置，

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