如何在GraphStream中布局节点一次

Question

可以使用

Viewer#enableAutoLayout()在GraphStream中激活布局过程。不幸的是，此过程会像节点拖动一样篡改每个用户交互。

是否可以进行一次自动布局然后停止？

我试图转动自动布局一秒钟并等待，但这不起作用。

package tests.graphstream;
import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import org.graphstream.graph.Graph;
import org.graphstream.graph.implementations.SingleGraph;
import org.graphstream.ui.swingViewer.View;
import org.graphstream.ui.swingViewer.Viewer;
public class Tutorial1_01 {
    private static Graph graph = new SingleGraph("Tutorial 1");
    public static class MyFrame extends JFrame {
        private static final long serialVersionUID = 8394236698316485656L;
        //private Graph graph = new MultiGraph("embedded");
        private Viewer viewer = new Viewer(graph, Viewer.ThreadingModel.GRAPH_IN_ANOTHER_THREAD);
        //private Viewer viewer = new Viewer(graph, Viewer.ThreadingModel.GRAPH_IN_SWING_THREAD);
        private View view = viewer.addDefaultView(false);
        private View defaultView  = viewer.getDefaultView();
        public MyFrame() {
             setLayout(new BorderLayout());
             //add( new JScrollPane(defaultView), BorderLayout.CENTER);
             add(defaultView, BorderLayout.CENTER);
             setDefaultCloseOperation(EXIT_ON_CLOSE);
        }
    }
    public static void main(String args[]) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {

                MyFrame frame = new MyFrame();

                frame.setSize(320, 240);
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
                graph.addNode("A");
                graph.addNode("B");
                graph.addNode("C");
                graph.addEdge("AB", "A", "B");
                graph.addEdge("BC", "B", "C");
                graph.addEdge("CA", "C", "A");
                graph.addAttribute("ui.quality");
                graph.addAttribute("ui.antialias");

                frame.viewer.enableAutoLayout();
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                }
                frame.viewer.disableAutoLayout();
                //frame.view.getCamera().resetView();
            }
        });


    }
}

Answer 1

一种（但肯定不是最好的）解决方案是计算run方法中的布局。

首先创建布局类的实例并将其插入图形，然后再修改图形。

然后计算布局，直到某个停止条件。就计算而言，固定数量的迭代是一个安全的选择，但可能不会给你带来好的结果。相反，您可以迭代直到布局自行稳定（这可能永远不会发生，具体取决于您的图形......

public void run() {
    MyFrame frame = new MyFrame();
    frame.setSize(320, 240);
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
    // a layout algorithm instance plugged to the graph
    Layout layout = new SpringBox(false);
    graph.addSink(layout);
    layout.addAttributeSink(graph);
    graph.addNode("A");
    graph.addNode("B");
    graph.addNode("C");
    graph.addEdge("AB", "A", "B");
    graph.addEdge("BC", "B", "C");
    graph.addEdge("CA", "C", "A");
    graph.addAttribute("ui.quality");
    graph.addAttribute("ui.antialias");
    // iterate the compute() method a number of times
    while(layout.getStabilization() < 0.9){
        layout.compute();
    }   
}