SwingHandleMouseEvent

VTKExamples/Java/SwingIntegration/SwingHandleMouseEvent


Description

This example shows how to display in a JLabel the point the mouse is hovering over using a mouse listener.

Question

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Code

SwingHandleMouseEvent.java

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;

import vtk.*;

public class SwingHandleMouseEvent extends JFrame {

  // Loading Native Libraries.
  // Now it works in eclipse without any issues.
  static {
    if (!vtkNativeLibrary.LoadAllNativeLibraries()) {
      for (vtkNativeLibrary lib : vtkNativeLibrary.values()) {
        if (!lib.IsLoaded()) {
          System.out.println(lib.GetLibraryName() + " not loaded");
        }
      }
    }
    vtkNativeLibrary.DisableOutputWindow(null);
  }

  public SwingHandleMouseEvent() {
    vtkNamedColors colors = new vtkNamedColors();

    double bkg[] = new double[4];
    double actorColor[] = new double[4];
    colors.GetColor("RoyalBlue", bkg);
    colors.GetColor("LemonChiffon", actorColor);

    // Create a sphere source
    vtkSphereSource sphere = new vtkSphereSource();
    sphere.SetRadius(10.0);

    // Create a sphere mapper
    vtkPolyDataMapper sphereMapper = new vtkPolyDataMapper();
    sphereMapper.SetInputConnection(sphere.GetOutputPort());

    //create sphere actor
    vtkActor sphereActor = new vtkActor();
    sphereActor.SetMapper(sphereMapper);
    sphereActor.GetProperty().SetColor(actorColor);

    // Create a render window panel to display the sphere
    final vtkRenderWindowPanel renderWindowPanel = new vtkRenderWindowPanel();
    renderWindowPanel.setPreferredSize(new Dimension(600, 600));
    renderWindowPanel.setInteractorStyle(new vtkInteractorStyleTrackballCamera());

    add(renderWindowPanel, BorderLayout.CENTER);

    renderWindowPanel.GetRenderer().AddActor(sphereActor);
    renderWindowPanel.GetRenderer().SetBackground(bkg);

    // Create a status bar
    JPanel statusBar = new JPanel(new BorderLayout());
    final JLabel label = new JLabel(" ", SwingConstants.RIGHT);
    statusBar.add(label, BorderLayout.EAST);
    statusBar.setBorder(new BevelBorder(BevelBorder.LOWERED));

    add(statusBar, BorderLayout.SOUTH);

    final vtkCellPicker cellPicker = new vtkCellPicker();

    // Show the point on the sphere the mouse is hovering over in the status bar
    renderWindowPanel.addMouseMotionListener(new MouseMotionAdapter() {
      public void mouseMoved(MouseEvent e) {
        // The call to Pick needs to be surrounded by lock and unlock to prevent crashes.
        renderWindowPanel.lock();
        int pickSucceeded = cellPicker.Pick(e.getX(), renderWindowPanel.getHeight() - e.getY() - 1,
            0.0, renderWindowPanel.GetRenderer());
        renderWindowPanel.unlock();

        if (pickSucceeded == 1) {
          double[] p = cellPicker.GetPickPosition();
          label.setText("Position: " + p[0] + ", " + p[1] + ", " + p[2]);
        } else {
          label.setText(" ");
        }
      }
    });
  }

  public static void main(String[] args) {
    try {
      SwingUtilities.invokeLater(new Runnable() {
        public void run() {
          JPopupMenu.setDefaultLightWeightPopupEnabled(false);
          ToolTipManager.sharedInstance().setLightWeightPopupEnabled(false);

          JFrame frame = new SwingHandleMouseEvent();
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          frame.pack();
          frame.setVisible(true);
        }
      });
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}