我创建了一个 java 程序,它从 1 个顶点开始,然后从那里每个周期添加一个顶点和 2 条边。它使用静态布局
Layout<Number, Number> staticLayout = new StaticLayout<Number, Number>(g, layout);
vv = new VisualizationViewer<Number, Number>(staticLayout, new Dimension(550, 550));
这听起来很不专业,但图表看起来不够随机,基本上我的意思是,每次运行时,它们似乎总是在边缘周围聚集很多图表,而很少有人到达中心附近。我的程序通常使用 100 个生成的顶点,我最终会在中心有六个顶点,而其他顶点则在边缘。
下面是我刚刚创建的一个随机示例。
也许如果有人可以确认这实际上是随机的,或者如果没有办法解决这个问题,或者我设置了错误。因为我希望节点尽可能随机。
任何帮助,将不胜感激。谢谢
下面是小程序的相关代码。涉及其设置。
public class AnimatingAddNodeDemo extends JApplet {
//create a graph
Graph<Number, Number> ig = Graphs.synchronizedUndirectedGraph(new UndirectedSparseMultigraph<Number, Number>());
ObservableGraph<Number, Number> og = new ObservableGraph<Number, Number>(ig);
og.addGraphEventListener(new GraphEventListener<Number, Number>() {
public void handleGraphEvent(GraphEvent<Number, Number> evt) {
//System.err.println("got " + evt);
}
});
this.g = og;
//create a graphdraw
layout = new FRLayout<Number, Number>(g);
layout.setSize(new Dimension(600, 600));
setSize(700, 700);
Relaxer relaxer = new VisRunner((IterativeContext) layout);
relaxer.stop();
relaxer.prerelax();
Layout<Number, Number> staticLayout = new StaticLayout<Number, Number>(g, layout);
vv = new VisualizationViewer<Number, Number>(staticLayout, new Dimension(550, 550));
JRootPane rp = this.getRootPane();
rp.putClientProperty("defeatSystemEventQueueCheck", Boolean.TRUE);
getContentPane().setLayout(new BorderLayout());
}
Integer v_prev = null;
public void process() {
vv.getRenderContext().getPickedVertexState().clear();
vv.getRenderContext().getPickedEdgeState().clear();
try {
if (g.getVertexCount() < 100) {
//add a vertex
Integer v1 = nodeCount;
g.addVertex(v1);
nodeCount++;
System.out.println("adding vertex " + v1);
vv.getRenderContext().getPickedVertexState().pick(v1, true);
j.setText(myText);
// wire it to some edges
if (v_prev != null) {
Integer edge = edgeCount;
//vv.getRenderContext().getPickedEdgeState().pick(edge, true);
// let's connect to a random vertex, too!
int rand = (int) (Math.random() * (edgeCount-1)); // because there is a 0 node
while (v1.equals(rand)) {
System.out.println("avoided connecting to myself");
rand = (int) (Math.random() * (edgeCount-1)); // because there is a 0 node
}
edgeCount++;
g.addEdge(edge, rand, v1); //add an edge called var1, between the nodes var2 and var3
vv.getRenderContext().getPickedEdgeState().pick(edge, true);
System.out.println("Adding edge " + edge + " between " + rand + " & " + v1 + "()");
}
v_prev = v1;
layout.initialize();
Relaxer relaxer = new VisRunner((IterativeContext) layout);
relaxer.stop();
relaxer.prerelax();
vv.getRenderContext().getMultiLayerTransformer().setToIdentity();
vv.repaint();
} else {
done = true;
}
} catch (Exception e) {
System.out.println(e);
}
}
public static void main(String[] args) {
AnimatingAddNodeDemo and = new AnimatingAddNodeDemo();
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(and);
and.init();
and.start();
frame.pack();
//frame.setVisible(true);
}
}