canvas-0trasform.html

时间:2024-04-09 15:04:09
<!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>