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(512, 256);
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(0.0f, 0.0f, 0.0f, 0.0f);
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, 0.0f, 0.0f, 1.0f);
gl.glColor3f(1.0f, 1.0f, 1.0f);
gl.glRectf(-25.0f, -25.0f, 25.0f, 25.0f);
gl.glPopMatrix();
gl.glFlush();
spinDisplay();
}
public void reshape(GLAutoDrawable drawable, int x, int y, int w, int h)
{
GL gl = drawable.getGL();
gl.glViewport(0, 0, w, h);
gl.glMatrixMode(GL.GL_PROJECTION);
gl.glLoadIdentity();
if (w <= h) gl.glOrtho(-50.0, 50.0,//
-50.0 * (float) h / (float) w, //
50.0 * (float) h / (float) w, //
-1.0, 1.0);
else gl.glOrtho(-50.0 * (float) w / (float) h,
50.0 * (float) w / (float) h, -50.0, 50.0, //
-1.0, 1.0);
gl.glMatrixMode(GL.GL_MODELVIEW);
gl.glLoadIdentity();
}
public void displayChanged(GLAutoDrawable drawable, boolean modeChanged,
boolean deviceChanged)
{
}
private void spinDisplay()
{
spin = spin + spinDelta;
if (spin > 360f) spin = 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)
{
}
}
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