我正在使用 raphael js，当我单击“运行”按钮时，形状会沿着路径移动。我怎样才能使形状可拖动，以便用户可以选择拖动或单击运行？谢谢。这是我的代码：
Raphael("holder", 500,500, function () {
var r = this,
p = r.path ('M 215.2 448 L 215.2 405.2 L 189.8 401.5 L 161.8 393.5 L 134.3 380.8 L 112.1 363.9 L 90.9 345.4 L 73.4 321.6 L 63.9 304.6 L 56 286.1 L 47 251.7 L 47 213.1 L 49.6 196.7 L 54.4 174.5 L 58.6 159.1 L 68.2 140.6 L 78.2 123.7 L 90.9 107.8 L 103.6 95.1 L 120.5 85 L 133.2 74.5 L 154.4 63.4 L 170.8 56.5 L 191.4 50.7 L 210 47.5 L 232.7 48 L 252.3 50.7 L 269.7 55.4 L 287.2 60.2 L 306.2 70.2 L 320.5 79.8 L 338.5 93 L 351.8 105.2 L 364.4 121 L 375.6 135.3 L 385.6 154.4 L 391.4 170.8 L 396.2 188.8 L 400.4 204.6 L 400.4 223.1 L 400.4 241.1 L 396.2 263.4 L 392.5 280.8 L 384.6 299.3 L 376.1 315.7 L 363.9 333.2 L 352.3 348 L 338 364.4 L 321.1 375.5 L 296.2 387.7 L 268.7 398.8 L 268.7 378.7 L 289.3 370.2 L 298.8 364.9 L 314.7 355.4 L 328.5 343.8 L 340.6 332.7 L 353.3 318.9 L 361.8 303.6 L 370.8 286.1 L 375 271.8 L 379.8 253.8 L 381.4 238 L 381.4 218.4 L 378.2 190.9 L 372.4 175 L 365.5 156.5 L 359.2 144.8 L 347.5 129.5 L 336.4 117.9 L 323.2 103.6 L 311 95.1 L 294.6 86.1 L 279.3 77.6 L 260.7 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336.9 L 176.6 316.8 L 165.4 312.4 L 153.3 300.4 L 141.2 288.2 L 132.2 270.2 L 124.2 255.9 L 122.1 238 L 120.5 217.9 L 125.8 198.3 L 130.6 181.3 L 143.8 162.8 L 154.4 149.6 L 168.7 138 L 186.1 131.6 L 207.8 126.3 L 222.9 124.2 L 245.4 127.4 L 261.8 131.1 L 280.9 142.2 L 295.7 153.8 L 308.4 172.9 L 317.4 190.9 L 324.2 214.1 L 324.8 232.1 L 321.6 253.3 L 316.3 271.3 L 302.5 289.8 L 288.8 302.5 L 274 315.7 L 256 322.6 L 231.6 329.5 L 225.8 222.6 L 215.2').attr({stroke: "#fff", opacity: .0, "stroke-width": 10}),
len = p.getTotalLength(),
e = r.ellipse(0, 0, 6, 6).attr({stroke: "none", fill: "#fef506"}).onAnimation(function () {
var t = this.attr("transform");
over.attr({path: "M238,376L" + t[0][1] + "," + t[0][2] + "z"});
});
r.circle(516, 248, 5).attr({stroke: "none", fill: "#", opacity: 0}).click(function () {
e.attr({rx: 5, ry: 3}).animateAlong(p, 4000, true, function () {
e.attr({rx: 4, ry: 4});
});
});
r.customAttributes.along = function (v) {
var point = p.getPointAtLength(v * len);
return {
transform: "t" + [point.x, point.y] + "r" + point.alpha
};
};
e.attr({along: 0});
var rotateAlongThePath = true;
run=document.getElementById('run'),
run.onclick= function() {
e.animate({along:3},2000000, function () {
e.attr({along: 0});
e.animate(anim.delay(500));
setTimeout(run);
});
}
run();
});