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ch2_SpriteStatic.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Sprite Demonstration</title>
<script type="text/javascript" src="jquery-1.7.1.min.js"></script>
<style type="text/css">
#draw-target {
width: 480px;
height: 320px;
background-color: #CCF;
position: relative;
}
</style>
<script type="text/javascript">
/*
* DHTMLSprite 封装所有 DOM 的操作细节
* params 参数说明：
* @imagePath 图像文件路径
* @imagesWidth 图像文件的宽度
* @width sprite的宽度
* @height sprite的高度
* @$drawTarget sprite将要附加于的父元素
*/
var DHTMLSprite = function (params) {
var width = params.width,
height = params.height,
imagesWidth = params.imagesWidth,
// 在 $drawTarget 指定的 div 元素后加上一个 sprite div 元素
$element = params.$drawTarget.append('<div/>').find(':last'),
elemStyle = $element[0].style,
mathFloor = Math.floor;
$element.css({
position: 'absolute',
width: width,
height: height,
backgroundImage: 'url(' + params.imagePath + ')'
});
var that = {
draw: function (x, y) {
elemStyle.left = x + 'px';
elemStyle.top = y + 'px';
},
// 改变显示的 sprite 图像
changeImage: function (index) {
index *= width;
var vOffset = -mathFloor(index / imagesWidth) * height;
var hOffset = -index % imagesWidth;
elemStyle.backgroundPosition = hOffset + 'px '
+ vOffset + 'px';
},
show: function () {
elemStyle.display = 'block';
},
hide: function () {
elemStyle.display = 'none';
},
destroy: function () {
$element.remove();
}
};
return that;
};
</script>
<script>
$(function(){
var params = {
imagePath: 'images/cogs.png',
imagesWidth: 256,
width: 64,
height: 64,
$drawTarget: $('#draw-target')
};
var sprite1 = DHTMLSprite(params),
sprite2 = DHTMLSprite(params);
sprite2.changeImage(5);
sprite1.draw(64, 64);
sprite2.draw(352, 192);
});
</script>
</head>
<body>
<div id="draw-target"></div>
</body>
</html>