Raphael带文本标签可拖动的图形实现代码_javascript技巧



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。
代码如下:






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);
};








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。