html canvas非正方旋转和缩放...写的大多是正方的有人表示一直看正方的看厌了

浏览数：24 / 时间：2015年06月09日

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>非正方形对象的缩放和旋转</title>
<script src="js/modernizr.js"></script>
</head>

<body>
<script type="text/javascript">
window.addEventListener(‘load‘,eventWindowLoaded,false);
function eventWindowLoaded(){
	canvasApp();
}
function canvasSupport(){
	return Modernizr.canvas;
}
function canvasApp(){
	if(!canvasSupport()){
		return;
	}else{
		var theCanvas = document.getElementById(‘canvas‘)
		var context = theCanvas.getContext("2d")

	}
	drawScreen();
    function drawScreen(){
		
		
		context.setTransform(1,0,0,1,0,0);
		var angleInRadians = 45 * Math.PI / 180;
		var x = 100;
		var y = 100;
		var width = 100;
		var height = 50;
		context.translate(x+.5*width,y+.5*height);
		context.rotate(angleInRadians);
		context.scale(2,2);
		context.fillStyle="#000";
		context.fillRect(-.5*width,-.5*height,width,height);
		
    }
	
}


</script>
<canvas id="canvas" width="500" height="500">
你的浏览器无法使用canvas
小白童鞋；你的支持是我最大的快乐！！
</canvas>
</body>
</html>

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