使用Jung对带有值的顶点进行着色

Question

我现在在使用Java库Jung时遇到了问题。

我正在展示顶点和边，但是我找不到根据顶点的值进行着色的函数，而不是通过鼠标选择。

import edu.uci.ics.jung.algorithms.layout.FRLayout;
import edu.uci.ics.jung.algorithms.layout.Layout;
import edu.uci.ics.jung.graph.Graph;
import edu.uci.ics.jung.visualization.BasicVisualizationServer;
import edu.uci.ics.jung.visualization.decorators.PickableVertexPaintTransformer;
import edu.uci.ics.jung.visualization.decorators.ToStringLabeller;
import edu.uci.ics.jung.visualization.renderers.DefaultVertexLabelRenderer;
import edu.uci.ics.jung.visualization.renderers.Renderer.VertexLabel.Position;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Dimension;
import javax.swing.JFrame;

import org.apache.commons.collections15.Transformer;
import org.apache.commons.collections15.functors.ConstantTransformer;

public class Design {
     public Graph<String, Integer> g;
    public Design() {     

         this.g = ProjectTools.readNet("SmallTown.net");
    }

    public static <Paint> void main(String[] args) {
        Design sgv = new Design(); 
        Layout<Integer, String> layout = new FRLayout(sgv.g);
        layout.setSize(new Dimension(800,800));  
        BasicVisualizationServer<Integer, String> vv =
            new BasicVisualizationServer<Integer, String>(layout);

        Transformer<Integer,Paint> vertexPaint = new Transformer<Integer,Paint>() {
            public Paint transform(Integer i) {
                return (Paint) Color.GREEN;
            }
        };  

        vv.setPreferredSize(new Dimension(850,850));
        vv.getRenderContext().setVertexLabelRenderer(new DefaultVertexLabelRenderer(Color.green));
        vv.getRenderContext().setEdgeDrawPaintTransformer(new ConstantTransformer(Color.white));
        vv.getRenderContext().setEdgeStrokeTransformer(new ConstantTransformer(new BasicStroke(2.5f)));

        vv.getRenderContext().setVertexFillPaintTransformer((Transformer<Integer, java.awt.Paint>) vertexPaint);
        vv.getRenderContext().setVertexFillPaintTransformer(new PickableVertexPaintTransformer<Integer>(vv.getPickedVertexState(), Color.green, Color.yellow));

        vv.setBackground(Color.gray);
        vv.getRenderContext().setVertexLabelTransformer(new ToStringLabeller<Integer>());
        vv.getRenderer().getVertexLabelRenderer().setPosition(Position.CNTR);


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

我的渲染:

- Daleksek

Answer 1

我看到两个可能的问题；你调用了setVertexFillPaintTransformer两次，而且BasicVisualizationServer似乎不喜欢DefaultModalGraphMouse。

试试这个版本：

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Paint;

import javax.swing.JFrame;

import org.apache.commons.collections15.Transformer;
import org.apache.commons.collections15.functors.ConstantTransformer;

import edu.uci.ics.jung.algorithms.layout.FRLayout;
import edu.uci.ics.jung.algorithms.layout.Layout;
import edu.uci.ics.jung.graph.Graph;
import edu.uci.ics.jung.visualization.VisualizationViewer;
import edu.uci.ics.jung.visualization.control.DefaultModalGraphMouse;
import edu.uci.ics.jung.visualization.decorators.ToStringLabeller;
import edu.uci.ics.jung.visualization.picking.PickedInfo;
import edu.uci.ics.jung.visualization.renderers.DefaultVertexLabelRenderer;
import edu.uci.ics.jung.visualization.renderers.Renderer.VertexLabel.Position;

public class Design {
     public Graph<Integer, String> g;
    public Design() {     

         this.g = ProjectTools.readNet("SmallTown.net");
    }

    private static class VertexPaintTransformer implements Transformer<Integer,Paint> {

        private final PickedInfo<Integer> pi;

        VertexPaintTransformer ( PickedInfo<Integer> pi ) { 
            super();
            if (pi == null)
                throw new IllegalArgumentException("PickedInfo instance must be non-null");
            this.pi = pi;
        }

        @Override
        public Paint transform(Integer i) {
            Color p = null;
            //Edit here to set the colours as reqired by your solution
            if ( i % 2 == 0)
                p = Color.GREEN;
            else
                p =  Color.RED;
            //Remove if a selected colour is not required
            if ( pi.isPicked(i)){
                p = Color.yellow;
            }
            return p;
        }
    }

    public static <Paint> void main(String[] args) {
        Design sgv = new Design(); 
        Layout<Integer, String> layout = new FRLayout(sgv.g);
        layout.setSize(new Dimension(800,800));  
        VisualizationViewer<Integer, String> vv = new VisualizationViewer<Integer, String>(layout);

        Transformer<Integer,Paint> vertexPaint = new Transformer<Integer,Paint>() {

            @Override
            public Paint transform(Integer i) {
                if ( i % 2 == 0)
                    return (Paint) Color.GREEN;
                else
                    return  (Paint) Color.RED;
            }
        };  

        vv.setPreferredSize(new Dimension(850,850));
        vv.getRenderContext().setVertexLabelRenderer(new DefaultVertexLabelRenderer(Color.green));
        vv.getRenderContext().setEdgeDrawPaintTransformer(new ConstantTransformer(Color.white));
        vv.getRenderContext().setEdgeStrokeTransformer(new ConstantTransformer(new BasicStroke(2.5f)));

        vv.getRenderContext().setVertexFillPaintTransformer(new VertexPaintTransformer(vv.getPickedVertexState()));

        DefaultModalGraphMouse graphMouse = new DefaultModalGraphMouse();
        graphMouse.setMode(edu.uci.ics.jung.visualization.control.ModalGraphMouse.Mode.PICKING);
        vv.setGraphMouse(graphMouse);

        vv.setBackground(Color.gray);
        vv.getRenderContext().setVertexLabelTransformer(new ToStringLabeller<Integer>());
        vv.getRenderer().getVertexLabelRenderer().setPosition(Position.CNTR);


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

我已经用一个新的版本VertexPaintTransformer替换了你的Transformer，支持选择功能，删除了第二次使用的setVertexFillPaintTransformer并将你从一个BasicVisualizationServer切换到VisualizationViewer，这样我就可以使用拾取的GraphMouse

我不得不模拟你的ProjectTools＃readNet（）方法，但我希望你能看到奇数、偶数和选定颜色。

现在，您可以按需要修改VertexPaintTransformer＃transform()

- GrahamA

---

谢谢您的回答，但是您的代码对我的配置无效。我不想使用鼠标来着色点。我想直接在我的代码中添加要着色的点。 - Daleksek

@Daleksek：“我不想用鼠标来着色点”，但是你使用了PickableVertexPaintTransformer，这意味着你想要选择顶点。尽管如此，你仍然可以更改VertexPaintTransformer#transform()的实现以满足你的需求，而不使用鼠标。为什么不试试这段代码，看看它的效果，你应该会得到交替的绿色和红色顶点。 - GrahamA