荣格图形每次都能出现在同一个地方吗？

我正在使用JUNG（http://jung.sourceforge.net/index.html http://jung.sourceforge.net/index.html）在java中绘制图形。这个软件很棒，但我有一个小问题。我如何确保每次显示的图表都是相同的（架构或位置没有变化）？

更具体地说：图形模型（要表示的数据）不会改变，但每次我点击“查看图形”按钮时，它的表示都会改变:) [一些顶点在其他地方，例如：有时在上部窗口的，有时在下部]

谢谢你，

Iulian

A 静态布局 http://jung.sourceforge.net/doc/api/edu/uci/ics/jung/algorithms/layout/StaticLayout.html让您指定一个顶点Point2D http://java.sun.com/j2se/1.5.0/docs/api/java/awt/geom/Point2D.html变压器。这将允许您控制顶点的放置位置并且应该执行您想要执行的操作。您应该使用以下内容构造函数 http://jung.sourceforge.net/doc/api/edu/uci/ics/jung/algorithms/layout/StaticLayout.html#StaticLayout(edu.uci.ics.jung.graph.Graph,%20org.apache.commons.collections15.Transformer):

public StaticLayout(Graph<V,E> graph,
                org.apache.commons.collections15.Transformer<V,Point2D> initializer)

你需要实现你自己的变压器 http://www.jarvana.com/jarvana/view/net/sourceforge/collections/collections-generic/4.01/collections-generic-4.01-javadoc.jar!/org/apache/commons/collections15/Transformer.html它接受一个顶点并返回该顶点应该出现的位置。其使用示例：

package test;

import java.awt.Dimension;
import java.awt.geom.Point2D;
import java.io.IOException;

import javax.swing.JFrame;

import org.apache.commons.collections15.Transformer;

import edu.uci.ics.jung.algorithms.layout.StaticLayout;
import edu.uci.ics.jung.graph.Graph;
import edu.uci.ics.jung.graph.SparseMultigraph;
import edu.uci.ics.jung.visualization.VisualizationViewer;

/**
 * Jung example - vertices appearing in same location
 * 
 * @author Kah
 */
public class StaticLocation {

    /**
     * @param args
     * @throws IOException
     */
    public static void main(String[] args) throws IOException {
        // Setup the example graph.
        Graph<Integer, String> basis = new SparseMultigraph<Integer, String>();
        basis.addVertex(Integer.valueOf(0));
        basis.addVertex(Integer.valueOf(1));
        basis.addVertex(Integer.valueOf(2));
        basis.addEdge("Edge 1", Integer.valueOf(0), Integer.valueOf(1));
        basis.addEdge("Edge 2", Integer.valueOf(0), Integer.valueOf(2));
        basis.addEdge("Edge 3", Integer.valueOf(1), Integer.valueOf(2));

        Transformer<Integer, Point2D> locationTransformer = new Transformer<Integer, Point2D>() {

            @Override
            public Point2D transform(Integer vertex) {
                int value = (vertex.intValue() * 40) + 20;
                return new Point2D.Double((double) value, (double) value);
            }
        };

        StaticLayout<Integer, String> layout = new StaticLayout<Integer, String>(
                basis, locationTransformer);
        layout.setSize(new Dimension(250, 250));
        VisualizationViewer<Integer, String> vv = new VisualizationViewer<Integer, String>(
                layout);

        vv.setPreferredSize(new Dimension(250, 250));

        JFrame frame = new JFrame("Simple Graph View 2");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(vv);
        vv.setOpaque(false);
        frame.pack();
        frame.setVisible(true);
    }
}

2010 年 2 月 20 日添加：

另一种方法是使用持久布局实现 http://jung.sourceforge.net/doc/api/edu/uci/ics/jung/visualization/layout/PersistentLayoutImpl.html将顶点的位置保存到文件中。但是，您还需要以某种方式持久化图形以获取其中的顶点和顶点（这需要单独持久化）。有许多类用于保存图表edu.uci.ics.jung.io http://jung.sourceforge.net/doc/api/edu/uci/ics/jung/io/package-summary.html。这是一个仅使用的示例持久布局实现 http://jung.sourceforge.net/doc/api/edu/uci/ics/jung/visualization/layout/PersistentLayoutImpl.html:

package test;

import java.awt.Dimension;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

import javax.swing.JFrame;

import org.apache.commons.collections15.Transformer;

import edu.uci.ics.jung.algorithms.layout.Layout;
import edu.uci.ics.jung.algorithms.layout.SpringLayout2;
import edu.uci.ics.jung.graph.Graph;
import edu.uci.ics.jung.graph.SparseMultigraph;
import edu.uci.ics.jung.io.GraphMLReader;
import edu.uci.ics.jung.io.GraphMLWriter;
import edu.uci.ics.jung.visualization.VisualizationViewer;
import edu.uci.ics.jung.visualization.decorators.ToStringLabeller;
import edu.uci.ics.jung.visualization.layout.PersistentLayoutImpl;

/**
 * Jung example - vertices appearing in same location
 * 
 * @author Kah
 */
public class PersistentVertices
{

    /**
     * @param args
     * @throws IOException
     */
    public static void main(String[] args) throws IOException
    {
        // Setup the example graph.
        try
        {
            VisualizationViewer<Integer, String> vv = new VisualizationViewer<Integer, String>(
                    getLayout());

            vv.setPreferredSize(new Dimension(250, 250));

            JFrame frame = new JFrame("Simple Graph View 2");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.getContentPane().add(vv);
            vv.setOpaque(false);
            frame.pack();
            frame.setVisible(true);
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }

    private static Layout<Integer, String> getLayout() throws IOException,
            ClassNotFoundException
    {
        Graph<Integer, String> graph = new SparseMultigraph<Integer, String>();
        File source = new File("C:\\layout.dat");
        SpringLayout2<Integer, String> backing = new SpringLayout2<Integer, String>(
                graph);
        PersistentLayoutImpl<Integer, String> layout = new PersistentLayoutImpl<Integer, String>(
                backing);
        layout.setSize(new Dimension(250, 250));

        // Note that you also need to put the vertices and edges back before
        // restoring.
        graph.addVertex(Integer.valueOf(0));
        graph.addVertex(Integer.valueOf(1));
        graph.addVertex(Integer.valueOf(2));
        graph.addEdge("Edge 1", Integer.valueOf(0), Integer.valueOf(1));
        graph.addEdge("Edge 2", Integer.valueOf(0), Integer.valueOf(2));
        graph.addEdge("Edge 3", Integer.valueOf(1), Integer.valueOf(2));

        if (source.exists())
        {
            layout.restore(source.getAbsolutePath());
        }
        else
        {
            layout.persist(source.getAbsolutePath());
        }
        return layout;
    }
}

请注意，该示例尚未保留顶点和边，因为我还没有时间弄清楚如何使用这些类edu.uci.ics.jung.io http://jung.sourceforge.net/doc/api/edu/uci/ics/jung/io/package-summary.html yet.