我正在使用边缘拾取事件来查看单击了哪个边缘。从我观察到的情况来看，我发现即使边缘被显示，也不会拾取一条边。一个我点击边缘，我显示拾取的边缘。
在我的下面的代码中，即使在我尝试点击所有这些边缘之后也从未拾取过一条边（其中任何一条是三条边）。为什么会这样，或者我是唯一一个遇到它的人？此外，仅当我将图形旋转180度时，边缘似乎才能正确显示。
package test;
import edu.uci.ics.jung.algorithms.layout.CircleLayout;
import edu.uci.ics.jung.algorithms.layout.Layout;
import edu.uci.ics.jung.graph.DirectedSparseGraph;
import edu.uci.ics.jung.graph.DirectedSparseMultigraph;
import edu.uci.ics.jung.graph.Graph;
import edu.uci.ics.jung.visualization.VisualizationViewer;
import edu.uci.ics.jung.visualization.control.CrossoverScalingControl;
import edu.uci.ics.jung.visualization.control.DefaultModalGraphMouse;
import edu.uci.ics.jung.visualization.control.ModalGraphMouse;
import edu.uci.ics.jung.visualization.control.ScalingControl;
import edu.uci.ics.jung.visualization.decorators.EdgeShape;
import edu.uci.ics.jung.visualization.decorators.ToStringLabeller;
import edu.uci.ics.jung.visualization.picking.PickedState;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.Paint;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.util.Collection;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import org.apache.commons.collections15.Transformer;
import org.apache.commons.collections15.functors.ConstantTransformer;
public class Test2 {
public static void main(String args[])
{
Graph graph = new DirectedSparseMultigraph<String, String>();
graph.addEdge("Edge 5", "Peer 1", "Peer 2");
graph.addEdge("Edge 6", "Peer 1", "Peer 2");
graph.addEdge("Edge 7", "Peer 1", "Peer 2");
Layout<Integer, String> layout = new CircleLayout(graph);
VisualizationViewer tempViewer = new VisualizationViewer<>(layout);
tempViewer.setPreferredSize(new Dimension(700,700));
tempViewer.getRenderContext().setVertexLabelTransformer(new ToStringLabeller());
tempViewer.setVertexToolTipTransformer(new ToStringLabeller());
tempViewer.getRenderContext().setArrowFillPaintTransformer(new ConstantTransformer(Color.lightGray));
DefaultModalGraphMouse graphMouse = new DefaultModalGraphMouse();
tempViewer.getRenderContext().setEdgeShapeTransformer(new EdgeShape.BentLine<>()); // If I comment this line, the program works perfectly fine
graphMouse.setMode(ModalGraphMouse.Mode.PICKING);
Transformer<String, Paint> edgePaint = new Transformer<String, Paint>() {
@Override
public Paint transform(String graphEdge) {
int redValue = Math.abs(graphEdge.hashCode() % 235);
int greenValue = Math.abs(graphEdge.hashCode() % 200);
int blueValue = Math.abs(graphEdge.hashCode() % 175);
return new Color(redValue, greenValue, blueValue);
}
};
tempViewer.getRenderContext().setEdgeDrawPaintTransformer(edgePaint);
tempViewer.setGraphMouse(graphMouse);
final PickedState<String> pickedState = tempViewer.getPickedEdgeState();
pickedState.addItemListener(new ItemListener() {
@Override
public void itemStateChanged(ItemEvent e) {
Object subject = e.getItem();
if (subject instanceof String) {
String edgePicked = (String) subject;
if (pickedState.isPicked(edgePicked)) {
System.out.println("Edge picked" + edgePicked);
}
}
}
});
JPanel graphPanel = new JPanel(new BorderLayout());
graphPanel.add(tempViewer, BorderLayout.CENTER);
JPanel controlPanel = addLegendControls(tempViewer, graph);
graphPanel.add(controlPanel, BorderLayout.SOUTH);
JFrame masterFrame = new JFrame();
masterFrame.add(graphPanel);
masterFrame.pack();
masterFrame.setVisible(true);
masterFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
static JPanel addLegendControls(VisualizationViewer chartViewer, Graph tempGraph)
{
JPanel masterPanel = new JPanel(new BorderLayout());
JPanel secondPanel = new JPanel(new GridLayout(1, 2));
DefaultModalGraphMouse graphMouse = new DefaultModalGraphMouse();
chartViewer.setGraphMouse(graphMouse);
JComboBox modeBox = graphMouse.getModeComboBox();
modeBox.addItemListener(graphMouse.getModeListener());
graphMouse.setMode(ModalGraphMouse.Mode.TRANSFORMING);
final ScalingControl scalerGraph = new CrossoverScalingControl();
JButton zoomPlus = new JButton("+");
zoomPlus.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
scalerGraph.scale(chartViewer, 1.1f, chartViewer.getCenter());
}
});
JButton zoomMinus = new JButton("-");
zoomMinus.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
scalerGraph.scale(chartViewer, 1 / 1.1f, chartViewer.getCenter());
}
});
final int defaultRowSize = 10;
JPanel legendBox = new JPanel(new GridLayout(defaultRowSize, 1));
int borderThickness = 2;
legendBox.setBorder(BorderFactory.createLineBorder(Color.BLACK, borderThickness));
JLabel legendLabel = new JLabel(" LEGEND ");
legendBox.add(legendLabel);
Collection<String> graphEdges = tempGraph.getEdges();
for ( String graphLabel : graphEdges) {
Color edgeColor = (Color)chartViewer.getRenderContext().getEdgeDrawPaintTransformer().transform(graphLabel);
JPanel circlePanel = new JPanel() {
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(edgeColor);
g.fillOval(2, 9, 10, 10);
}
};
JLabel edgeLabel = new JLabel(" " + graphLabel + " Sent From: " + tempGraph.getSource(graphLabel) + " To : " + tempGraph.getDest(graphLabel));
circlePanel.add(edgeLabel);
legendBox.add(circlePanel);
}
JPanel modePanel = new JPanel(new GridLayout(1, 1));
modePanel.setBorder(BorderFactory.createTitledBorder("Mouse Mode"));
modePanel.add(modeBox);
secondPanel.add(modePanel);
JPanel zoomPanel = new JPanel(new GridLayout(1, 2));
zoomPanel.setBorder(BorderFactory.createTitledBorder("Manual Zoom Controls"));
zoomPanel.add(zoomPlus);
zoomPanel.add(zoomMinus);
secondPanel.add(zoomPanel);
masterPanel.add(secondPanel, BorderLayout.SOUTH);
masterPanel.add(legendBox, BorderLayout.EAST);
return masterPanel;
}
}