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How to implement a simple double-buffered animation with mouse events E-mail
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This is a simple double buffered animation of a white rectangle in JOGL. Pressing the left mouse button rotates the rectangle and pressing the middle mouse button stops the rotation. The example is ported from C examples in the OpenGL Programming Guide (known as the "red book").


Image

-> Copyright and Permission Notice

package glredbook10;

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

import javax.media.opengl.*;
import javax.media.opengl.glu.*;
import com.sun.opengl.util.*; 

import javax.media.opengl.GLEventListener;

/**
 * This is a simple double buffered program. Pressing the left mouse button
 * rotates the rectangle. Pressing the middle mouse button stops the rotation.
 
 @author Kiet Le (Java conversion)
 */
public class doublebuf
  extends JFrame
    implements GLEventListener, KeyListener, MouseListener
{
  private GLCapabilities caps;
  private GLCanvas canvas;
  private FPSAnimator animator;
  private float spin = 0f, spinDelta = 0f;

  public doublebuf()
  {
    super("doublebuf");
    
    caps = new GLCapabilities();
    caps.setDoubleBuffered(true);// request double buffer display mode
    canvas = new GLCanvas(caps);
    canvas.addGLEventListener(this);
    canvas.addMouseListener(this);// register mouse callback functions
    animator = new FPSAnimator(canvas, 60);
    
    getContentPane().add(canvas);
  }

  public void run()
  {
    setSize(512256);
    setLocationRelativeTo(null);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setVisible(true);
    animator.start();
  }

  public static void main(String[] args)
  {
    new doublebuf().run();
  }

  public void init(GLAutoDrawable drawable)
  {
    GL gl = drawable.getGL();
    gl.glClearColor(0.0f0.0f0.0f0.0f);
    gl.glShadeModel(GL.GL_FLAT);
  }

  public void display(GLAutoDrawable drawable)
  {
    GL gl = drawable.getGL();
    gl.glClear(GL.GL_COLOR_BUFFER_BIT);
    gl.glPushMatrix();
    gl.glRotatef(spin, 0.0f0.0f1.0f);
    gl.glColor3f(1.0f1.0f1.0f);
    gl.glRectf(-25.0f, -25.0f25.0f25.0f);
    gl.glPopMatrix();

    gl.glFlush();
    spinDisplay();
  }

  public void reshape(GLAutoDrawable drawable, int x, int y, int w, int h)
  {
    GL gl = drawable.getGL();
    gl.glViewport(00, w, h);
    gl.glMatrixMode(GL.GL_PROJECTION);
    gl.glLoadIdentity();
    
    if (w <= hgl.glOrtho(-50.050.0,//
        -50.0 (floath / (floatw, //
        50.0 (floath / (floatw, //
        -1.01.0);
    else gl.glOrtho(-50.0 (floatw / (floath,
        50.0 (floatw / (floath, -50.050.0//
        -1.01.0);
    
    gl.glMatrixMode(GL.GL_MODELVIEW);
    gl.glLoadIdentity();
  }

  public void displayChanged(GLAutoDrawable drawable, boolean modeChanged,
      boolean deviceChanged)
  {
  }

  private void spinDisplay()
  {
    spin = spin + spinDelta;
    if (spin > 360fspin = spin - 360;
  }

  public void keyTyped(KeyEvent key)
  {
  }

  public void keyPressed(KeyEvent key)
  {
    switch (key.getKeyCode()) {
      case KeyEvent.VK_ESCAPE:
        new Thread()
        {
          public void run()
          {
            animator.stop();
          }
        }.start();
        System.exit(0);
      default:
        break;
    }
  }

  public void keyReleased(KeyEvent key)
  {
  }

  public void mouseClicked(MouseEvent key)
  {
  }

  public void mousePressed(MouseEvent mouse)
  {
    switch (mouse.getButton()) {
      case MouseEvent.BUTTON1:
        spinDelta = 2f;
        break;
      case MouseEvent.BUTTON2:
      case MouseEvent.BUTTON3:
        spinDelta = 0f;
        break;
    }
  }

  public void mouseReleased(MouseEvent mouse)
  {
  }

  public void mouseEntered(MouseEvent mouse)
  {
  }

  public void mouseExited(MouseEvent mouse)
  {
  }

}

Source: Kiet Le's The Red Book Examples using JOGL


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