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Raphael带文本标签可拖动的图形实现代码

最近准备学学Javascript和Raphaël,实现一个可拖动的矩形,另外矩形上还得显示标签。查了一下网上这个东西还比较冷门。Javascript才学没几天,代码估计写的很烂。
复制代码 代码如下:

<!doctype html>
<html charset="utf-8">
<head>
<title>Raphaël - Connectivities</title>
<script src="raphael-min.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
function Entity(r, l, t, w, h){
this.Label = r.text(l + w/2, t + h/2, "Hello World!");
this.Rectangle = r.rect(l, t, w, h, 10).attr({fill:"brown", stroke:"#666", title:"A Rectangle"}).drag(move, Dragger, up).data("cooperative", this.Label).toBack();
function Dragger(){
this.xx = this.attr("x");
this.yy = this.attr("y");
this.animate({"fill-opacity": .2}, 500);
}
function move(dx, dy){
var attr = {x: this.xx + dx, y: this.yy + dy};
this.attr(attr);
var lb = this.data("cooperative");
var attr1 = {x: this.xx + dx + this.attr("width") / 2, y: this.yy + dy + this.attr("height") / 2};
lb.attr(attr1);
}
function up(){
this.animate({"fill-opacity": 1}, 300);
}
}
window.onload = function(){
var r = Raphael("holder", 620, 420),discattr={fill:"red", stroke:"none"};
var entity1 = new Entity(r, 0, 0, 60, 40);
};
</script>
</head>
<body>
<div id="holder">
</div>
</body>
</html>

实现方法就是将Text作为Rectangle自定义属性,才能控制当拖动的时候,随着Rectangle一起移动。
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