在dracula图上绘制不同的节点形状？

<script src="https://cdnjs.cloudflare.com/ajax/libs/raphael/2.3.0/raphael.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/dracula/1.0.6/dracula_graph.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/dracula/1.0.6/dracula_algorithms.js"></script>

<div id="graph-container"></div>

// 创建一个图形实例
var graph = new Dracula.Graph();

// 添加节点
var node1 = graph.addNode("Node 1");
var node2 = graph.addNode("Node 2");
var node3 = graph.addNode("Node 3");

// 设置节点形状
node1.shape = "rect"; // 矩形形状
node2.shape = "ellipse"; // 椭圆形状
node3.shape = "diamond"; // 菱形形状

// 创建渲染器
var renderer = new Dracula.Renderer("#graph-container", graph, 400, 300);

// 渲染图形
renderer.draw();