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  • canvas-0trasform.html

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Document</title>
    </head>
    <body>
        <canvas id="canvas" style="margin:0 auto;border:1px #ddd solid">
            The current browser does not support Canvas, can replace the browser a try!
        </canvas>
    
        <script>
    
            window.onload = function(){
                var canvas = document.getElementById('canvas');
    
                canvas.width = 1024;
                canvas.height = 768;
    
                if(canvas.getContext('2d')){
                    var context = canvas.getContext('2d');
    
                    context.fillStyle = "red";
                    context.strokeStyle = "#058";
                    context.lineWidth = 5;
    
                    ////////////////////////
                    //a c e
                    //b d f
                    //0 0 1
                    // a d 水平、垂直缩放
                    // b c 水平、垂直倾斜
                    // e f 水平、垂直位移
                    ////////////////////////
    
                    context.save();
                        context.transform(2,0.2,0.3,1.5,30,50);
                        context.transform(2,-0.2,-0.3,1.5,30,50);
    
                        // setTransform可以使得之前变换的效果全部失效
                        context.setTransform(1,0,0,1,100,100)
                        context.strokeRect(50,50,300,300);
                        context.fillRect(50,50,300,300);
                    context.restore();
        
    
                }else{
                    alert('当前游览器不支持Canvas,请更换游览器后再试!');
                }
            }
    
        </script>
    </body>
    <script>
        /*
        变换矩阵 trasform
            a c e
            b d f
            0 0 1
    
            a 水平缩放(1)
            b 水平倾斜(0)
            c 垂直倾斜(0)
            d 垂直缩放(1)
            e 水平位移(0)
            f 垂直位移(0)
            
        */
    </script>
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  • 原文地址:https://www.cnblogs.com/cynthia-wuqian/p/4978322.html
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