Question

请，需要帮助。我试图用jung可视化图形，但顶点不断移动并随机改变颜色。我想要实现的是显示一些具有特定颜色的顶点（比如具有以颜色区分的簇的顶点），然后继续可视化两个感兴趣的顶点之间的路径。顶点的数量超过500.我是jung的新手并且为了完成这个任务，我试图修改我从这个论坛上的一个线程获得的代码。我正在使用的代码如下所示

import edu.uci.ics.jung.algorithms.layout.ISOMLayout;
import edu.uci.ics.jung.algorithms.layout.Layout;
import edu.uci.ics.jung.graph.SparseGraph;
import edu.uci.ics.jung.visualization.RenderContext;
import edu.uci.ics.jung.visualization.VisualizationViewer;
import edu.uci.ics.jung.visualization.control.DefaultModalGraphMouse;
import edu.uci.ics.jung.visualization.control.ModalGraphMouse;
import edu.uci.ics.jung.visualization.renderers.Renderer;
import edu.uci.ics.jung.visualization.transform.shape.GraphicsDecorator;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Shape;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Point2D;
import java.util.Random;
import javax.swing.JFrame;
import org.apache.commons.collections15.Transformer;

public class graphMainHelp {

public static void main(String[] args) {

    SparseGraph graph = new SparseGraph();
    String[] vertices = {"A", "B", "C", "D", "E", "F", "G", "H", "I", "J"};

    for (int i = 0; i < vertices.length; i++) {
        graph.addVertex((String) vertices[i]);
    }

    graph.addEdge(1, "J", "A");
    graph.addEdge(2, "A", "C");
    graph.addEdge(3, "B", "A");
    graph.addEdge(4, "B", "J");
    graph.addEdge(5, "I", "E");
    graph.addEdge(6, "B", "F");
    graph.addEdge(7, "C", "A");
    graph.addEdge(8, "G", "E");
    graph.addEdge(9, "G", "F");
    graph.addEdge(10, "H", "B");
    graph.addEdge(11, "G", "C");
    graph.addEdge(12, "E", "G");
    graph.addEdge(13, "I", "B");
    graph.addEdge(14, "F", "J");
    graph.addEdge(15, "F", "E");


    if (graph.getVertexCount() != 0 || graph.getEdgeCount() != 0) {
        Layout<String, String> layout = new ISOMLayout<String, String>(graph);
        layout.setSize(new Dimension(700, 700));

        VisualizationViewer<String, String> vv = new VisualizationViewer<String, String>(layout);



        vv.getRenderContext().setVertexLabelTransformer(new Transformer<String, String>() {

            @Override
            public String transform(String arg0) {
                return arg0;
            }
        });

        vv.getRenderer().setVertexRenderer(new MyRenderer());


         final DefaultModalGraphMouse<String, Number> graphMouse = new
         DefaultModalGraphMouse<String, Number>();
         graphMouse.setMode(ModalGraphMouse.Mode.PICKING);
         vv.setGraphMouse(graphMouse);


        JFrame frame = new JFrame();
        frame.getContentPane().add(vv);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);
    }// close main method    


}

static class MyRenderer implements Renderer.Vertex<String, String> {

    @Override
    public void paintVertex(RenderContext<String, String> rc, Layout<String, String> layout, String vertex) {
        GraphicsDecorator graphicsContext = rc.getGraphicsContext();
        Point2D center = layout.transform(vertex);

        Shape shape = null;
        Color color = null;

        shape = new Ellipse2D.Double(center.getX() - 10, center.getY() - 10, 20, 20);
        Random random = new Random();
        int r = random.nextInt(256);  
        int g = random.nextInt(200);
        int b = random.nextInt(250);

        color = new Color(r, g, b);
        graphicsContext.setPaint(color);
        graphicsContext.fill(shape);

    }
}//close static class

}

Answer 1

顶点正在改变颜色，因为你告诉它们：每次渲染一个顶点时，你都会给它一个新的随机颜色来绘制它。我真的不明白你为什么要使用自定义渲染器。如果您想指定默认值以外的形状或颜色，请查看PluggableRendererContext和相关演示。

JUNG下载本身有很多演示;我建议您先看看它们，而不是从StackOverflow上的示例开始。

Jung Graph可视化：顶点显示像圣诞灯

1 个答案: