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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>用图案填充形状</title>
<script src="js/modernizr.js"></script>
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<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(){
var fillImg=new Image();
fillImg.src='fill_20x20.png';
fillImg.onload=function(){
//简单的onload
//图片填充的4种类型：repeat,no-repeat,repeat-x,repeat-y;
//createPattern()填充图像函数，一个图像的实例，一个填充的类型
var fillPattern = context.createPattern(fillImg,'repeat-x');
var fillPattern1 = context.createPattern(fillImg,'repeat-y');
var fillPattern2 = context.createPattern(fillImg,'repeat');
context.fillStyle=fillPattern;
context.fillRect(0,0,100,20);
context.fillStyle=fillPattern1;
context.fillRect(0,10,100,20);
context.fillStyle=fillPattern2;
context.fillRect(0,60,100,10);
}
}
}
</script>
<canvas id="canvas" width="500" height="500">
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</body>
</html>