jung 自定义顶点形状或图片

可以变为三角形，正方形，多边形。。
只需将 BasicVisualizationServer升级为VisualizationViewer，然后变换器生成图形，渲染环境即可。

// vv = new BasicVisualizationServer<People, Link>(layout);
		vv = new VisualizationViewer<People, Link>(layout);

		// 设置顶点文本标签
		vv.getRenderContext().setVertexLabelTransformer(
				new ToStringLabeller<People>());
		// 设置边文本标签
		vv.getRenderContext().setEdgeLabelTransformer(
				new ToStringLabeller<Link>());
		
		//自定义顶点形状
		//设置顶点形状的显示尺寸为：字符数*8+16
		Transformer<People, Integer> vst = new Transformer<People, Integer>() {
			public Integer transform(People i) {
				int len = i.toString().length();
				if (len < 3)
					len = 3;
				return new Integer(len * 8 + 50);
			}
		};
		//高宽比变换器
		Transformer<People, Float> vart = new Transformer<People, Float>() {
			public Float transform(People i) {
				int len = i.toString().length();
				if (len < 3)
					len = 3;
				return new Float(2.0 / len);
			}
		};
		//构造顶点形状工厂
		final VertexShapeFactory<People> vsf = new VertexShapeFactory<People>();
		//设置顶点形状变换器
		Transformer<People, Shape> vstr = new Transformer<People, Shape>() {
			public Shape transform(People p) {
				return vsf.getRectangle(p);
			}
		};
		//将形状变换器置入渲染环境中
		vv.getRenderContext().setVertexShapeTransformer(vstr);
		
		// 响应鼠标事件
		DefaultModalGraphMouse<People, Link> gm = new DefaultModalGraphMouse<People, Link>();
		gm.setMode(Mode.PICKING);
		vv.setGraphMouse(gm);

		getContentPane().add(vv);
		pack();
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		//将顶点设置为图片
		final ImageIcon ii=new ImageIcon("1.gif");
		Transformer <Integer, Icon> vit=new Transformer<Integer,Icon>(){
			public Icon transform(Integer arg0) {
				return ii;
			}
		};
		vv.getRenderContext().setVertexIconTransformer(vit);
		vv.getRenderer().getVertexLabelRenderer().setPosition(Position.E);