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<!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:http://www.cnblogs.com/cynthia-wuqian/p/4978322.html