Java 显示预使用节点字段

我想显示一个简单的图形，其中节点ID位于使用的节点中，但这似乎比听起来更复杂

Graph g = new Graph();
for (int i = 0; i < 3; ++i) {
    Node n1 = g.addNode();
    n1.setInt("label", 1); // I am trying to add a field in a node
    Node n2 = g.addNode();
    Node n3 = g.addNode();
    g.addEdge(n1, n2);
    g.addEdge(n1, n3);
    g.addEdge(n2, n3);
}
g.addEdge(0, 3);
g.addEdge(3, 6);
g.addEdge(6, 0);

// add visual data groups
VisualGraph vg = m_vis.addGraph(GRAPH, g);
m_vis.setInteractive(EDGES, null, false);
m_vis.setValue(NODES, null, VisualItem.SHAPE, new Integer(Constants.SHAPE_STAR));

---

我不知道如何使用节点中的字段。我试着读了这本书，但没能弄明白

您可能正在寻找

LabelRenderer

。在下文中，

LabelRenderer

的构造方式可以渲染具有标签

GraphLib.label

（定义为

“label”

）的节点：

组成

图形的节点通过
setString（）
使用相同的键
GraphLib.LABEL
给出文本。例如，添加到
GraphLib.getDiamondTree（）
返回的
Graph
中的根
节点
被分配键
GraphLib.LABEL
和值
“0,0”

稍后，当
可视化运行时，渲染器尝试使用
GraphLib.LABEL
字段中的文本


答案有点晚了，我自己想出来了，但还是谢谢。
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: -1
    at java.util.ArrayList.elementData(Unknown Source)
    at java.util.ArrayList.get(Unknown Source)
    at prefuse.data.Table.getColumn(Table.java:457)
    at prefuse.data.Table.setInt(Table.java:1032)
    at prefuse.data.tuple.TableTuple.setInt(TableTuple.java:215)
    at prefuse.demos.AggregateDemo.initDataGroups(AggregateDemo.java:141)
    at prefuse.demos.AggregateDemo.<init>(AggregateDemo.java:72)
    at prefuse.demos.AggregateDemo.demo(AggregateDemo.java:182)
    at prefuse.demos.AggregateDemo.main(AggregateDemo.java:176)

LabelRenderer r = new LabelRenderer(GraphLib.LABEL);

Node r = t.addRoot();
r.setString(LABEL, "0,0");

import java.awt.Dimension;
import javax.swing.JFrame;
import prefuse.Display;
import prefuse.Visualization;
import prefuse.action.ActionList;
import prefuse.action.RepaintAction;
import prefuse.action.assignment.ColorAction;
import prefuse.action.layout.graph.ForceDirectedLayout;
import prefuse.activity.Activity;
import prefuse.controls.DragControl;
import prefuse.controls.PanControl;
import prefuse.controls.ZoomControl;
import prefuse.data.Graph;
import prefuse.render.DefaultRendererFactory;
import prefuse.render.LabelRenderer;
import prefuse.util.ColorLib;
import prefuse.util.GraphLib;
import prefuse.visual.VisualItem;

/** @see https://stackoverflow.com/a/44274886/230513 */
public class Example {

    private static final int W = 640;
    private static final int H = 480;

    public static void main(String[] argv) {

        // -- 1. create the data ------------------------------------------------
        Graph graph = GraphLib.getDiamondTree(3, 2, 1);

        // -- 2. the visualization --------------------------------------------
        // add the graph to the visualization as the data group "graph"
        // nodes and edges are accessible as "graph.nodes" and "graph.edges"
        Visualization vis = new Visualization();
        vis.add("graph", graph);
        vis.setInteractive("graph.edges", null, false);

        // -- 3. the renderers and renderer factory ---------------------------
        LabelRenderer r = new LabelRenderer(GraphLib.LABEL);
        r.setRoundedCorner(8, 8); // round the corners

        // create a new default renderer factory
        // return our name label renderer as the default for all non-EdgeItems
        // includes straight line edges for EdgeItems by default
        vis.setRendererFactory(new DefaultRendererFactory(r));

        // -- 4. the processing actions ---------------------------------------
        ColorAction fill = new ColorAction("graph.nodes",
            VisualItem.FILLCOLOR, ColorLib.rgb(200, 200, 255));
        // use black for node text
        ColorAction text = new ColorAction("graph.nodes",
            VisualItem.TEXTCOLOR, ColorLib.gray(0));
        // use light grey for edges
        ColorAction edges = new ColorAction("graph.edges",
            VisualItem.STROKECOLOR, ColorLib.gray(200));

        // create an action list containing all color assignments
        ActionList color = new ActionList();
        color.add(fill);
        color.add(text);
        color.add(edges);

        // create an action list with an animated layout
        ActionList layout = new ActionList(Activity.INFINITY);
        layout.add(new ForceDirectedLayout("graph"));
        layout.add(new RepaintAction());

        // add the actions to the visualization
        vis.putAction("color", color);
        vis.putAction("layout", layout);

        // -- 5. the display and interactive controls -------------------------
        Display d = new Display(vis) {

            @Override
            public Dimension getPreferredSize() {
                return new Dimension(W, H);
            }
        };
        d.setSize(W, H); // set display size
        d.pan(W / 2, H / 2); // pan to center
        d.addControlListener(new DragControl());
        d.addControlListener(new PanControl());
        d.addControlListener(new ZoomControl());

        // -- 6. launch the visualization -------------------------------------
        JFrame frame = new JFrame("prefuse label example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(d);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true); // show the window

        vis.run("color");
        vis.run("layout");
    }
}