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<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>
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<body>
<script type="text/javascript">
window.addEventListener('load',eventWindowLoaded,false);
function eventWindowLoaded(){
canvasApp();
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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">
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