JUNG图形可视化中的顶点标签 [英] Vertex label in JUNG graph visualization

问题描述

我写了一个小图形可视化类：

pre $ public c ++ simpleGraph（SparseMultigraph< Vertex，SEdge> graph，String name） {

布局< Vertex，SEdge> layout = new ISOMLayout（graph）;
layout.setSize（new Dimension（800,800））;
BasicVisualizationServer< Vertex，SEdge> vv = new BasicVisualizationServer< Vertex，SEdge>（layout）;
vv.setPreferredSize（new Dimension（850,850））; //设置查看区域大小

JFrame frame = new JFrame（name）;
frame.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）;
frame.getContentPane（）。add（vv）;
frame.pack（）;
frame.setVisible（true）;
}

如何为顶点和边添加标签？值存储在我的自定义顶点类中。我可以迭代Layout或BasicVisualizationServer中的所有顶点并添加标签吗？

感谢您的帮助！

解决方案

您需要为您的顶点/边缘调用标签转换器：

  vv.getRenderContext （）.setVertexLabelTransformer（new ToStringLabeller（））; 
  

这些在样本中很常见。它使用顶点类的toString（）方法来指定标签。

一个稍微涉及的例子：

< pre $ vv.getRenderContext（）。setEdgeLabelTransformer（new Transformer< MyEdge，String>（）{
public String transform（MyEdge e）{
return（e.toString （）++ e.getWeight（）+/+ e.getCapacity（））;
}
}）;


您不需要遍历边; EdgeLabelTransformer或VertexLabelTransformer会在您的边更新属性时标出边缘，VisualizationViewer会立即更新它们。

I wrote a little graph visualizer class:

    public void simpleGraph(SparseMultigraph<Vertex,SEdge> graph, String name) {

    Layout<Vertex, SEdge> layout = new ISOMLayout(graph);
    layout.setSize(new Dimension(800,800));
    BasicVisualizationServer<Vertex, SEdge> vv = new BasicVisualizationServer<Vertex, SEdge>(layout);
    vv.setPreferredSize(new Dimension(850,850)); //Sets the viewing area size

    JFrame frame = new JFrame(name);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.getContentPane().add(vv); 
    frame.pack();
    frame.setVisible(true);                 
}

How can I add labels for vertices and edges? The Values are stored in my custom vertex class. Can I iterate over all vertices in the Layout or BasicVisualizationServer and add labels?

Thanks for your help!

解决方案

You need to call a label transformer for your vertex/edge:

        vv.getRenderContext().setVertexLabelTransformer(new ToStringLabeller());

This is something you'd find pretty often in the samples. It uses the toString() method of your vertex class to specify the label.

A slightly more involved example:

        vv.getRenderContext().setEdgeLabelTransformer(new Transformer<MyEdge, String>() {
            public String transform(MyEdge e) {
                return (e.toString() + " " + e.getWeight() + "/" + e.getCapacity());
            }
        });

You don't need to iterate over the edges; the EdgeLabelTransformer or VertexLabelTransformer will label your edges as and when their properties are updated, and the VisualizationViewer will update them on the fly.

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