html5 canvas用图案填充形状 

<!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>用图案填充形状</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(){
        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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</canvas>
</body>
</html>
注意图片的路径！！！其他就和css的background感觉差不多

//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
posted @ 2015-04-20 19:56  一点点白  阅读(1023)  评论(0)  编辑  收藏  举报