This is a NEHE lesson written in JOGL(which is a little outdated,written in 2003),I change some wrong method invoke because class or interface has change the method in it.
But when I run the code .The form only flash one time and then only show the backcolor.I don’t know why and how to correct it.
Help ME! 
THANK YOU!
below are the code.
import java.awt.;
import java.awt.event.;
import javax.media.opengl.*;
import javax.media.opengl.glu.GLU;
/** Port of the NeHe OpenGL Tutorial (Lesson 2)
-
to Java using the Jogl interface to OpenGL. Jogl can be obtained
-
@author Kevin Duling (jattier@hotmail.com)
/
public class Lesson02
{
static class Renderer
implements GLEventListener,
KeyListener
{
/* Called when the display mode has been changed. !! CURRENTLY UNIMPLEMENTED IN JOGL !!- @param gLDrawable The GLDrawable object.
- @param modeChanged Indicates if the video mode has changed.
-
@param deviceChanged Indicates if the video device has changed.
*/
public void displayChanged(GLDrawable gLDrawable, boolean modeChanged, boolean deviceChanged)
{
}
/** Invoked when a key has been pressed.
- See the class description for {@link KeyEvent} for a definition of
- a key pressed event.
-
@param e The KeyEvent.
*/
public void keyPressed(KeyEvent e)
{
if (e.getKeyCode() == KeyEvent.VK_ESCAPE)
System.exit(0);
}
/** Invoked when a key has been released.
- See the class description for {@link KeyEvent} for a definition of
- a key released event.
-
@param e The KeyEvent.
*/
public void keyReleased(KeyEvent e) {}
/** Invoked when a key has been typed.
- See the class description for {@link KeyEvent} for a definition of
- a key typed event.
-
@param e The KeyEvent.
*/
public void keyTyped(KeyEvent e) {}
@Override
/** Called by the drawable to initiate OpenGL rendering by the client.- After all GLEventListeners have been notified of a display event, the
- drawable will swap its buffers if necessary.
-
@param gLDrawable The GLDrawable object.
*/
public void display(GLAutoDrawable glDrawable) {
// TODO Auto-generated method stub
final GL gl = glDrawable.getGL();
gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
gl.glLoadIdentity();
gl.glTranslatef(-1.5f, 0.0f, -6.0f);
gl.glBegin(GL.GL_TRIANGLES); // Drawing Using Triangles
gl.glVertex3f( 0.0f, 1.0f, 0.0f); // Top
gl.glVertex3f(-1.0f,-1.0f, 0.0f); // Bottom Left
gl.glVertex3f( 1.0f,-1.0f, 0.0f); // Bottom Right
gl.glEnd(); // Finished Drawing The Triangle
gl.glTranslatef(3.0f, 0.0f, 0.0f);
gl.glBegin(GL.GL_QUADS); // Draw A Quad
gl.glVertex3f(-1.0f, 1.0f, 0.0f); // Top Left
gl.glVertex3f( 1.0f, 1.0f, 0.0f); // Top Right
gl.glVertex3f( 1.0f,-1.0f, 0.0f); // Bottom Right
gl.glVertex3f(-1.0f,-1.0f, 0.0f); // Bottom Left
gl.glEnd(); // Done Drawing The Quad
gl.glFlush();
}
@Override
public void displayChanged(GLAutoDrawable drawable, boolean modeChanged,
boolean deviceChanged) {
// TODO Auto-generated method stub}
@Override
/** Called by the drawable immediately after the OpenGL context is
* initialized for the first time. Can be used to perform one-time OpenGL
* initialization such as setup of lights and display lists.
* @param gLDrawable The GLDrawable object.
*/
public void init(GLAutoDrawable gLDrawable) {
// TODO Auto-generated method stub
final GL gl = gLDrawable.getGL();
gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
gl.glShadeModel(GL.GL_FLAT);
gLDrawable.addKeyListener(this);
}@Override
/** Called by the drawable during the first repaint after the component has
* been resized. The client can update the viewport and view volume of the
* window appropriately, for example by a call to
* GL.glViewport(int, int, int, int); note that for convenience the component
* has already called GL.glViewport(int, int, int, int)(x, y, width, height)
* when this method is called, so the client may not have to do anything in
* this method.
* @param gLDrawable The GLDrawable object.
* @param x The X Coordinate of the viewport rectangle.
* @param y The Y coordinate of the viewport rectanble.
* @param width The new width of the window.
* @param height The new height of the window.
*/
public void reshape(GLAutoDrawable gLDrawable, int x, int y, int width,
int height) {
// TODO Auto-generated method stub
final GL gl = gLDrawable.getGL();
final GLU glu = new GLU();if (height <= 0) // avoid a divide by zero error! height = 1; final float h = (float)width / (float)height; gl.glViewport(0, 0, width, height); gl.glMatrixMode(GL.GL_PROJECTION); gl.glLoadIdentity(); glu.gluPerspective(45.0f, h, 1.0, 20.0); gl.glMatrixMode(GL.GL_MODELVIEW); gl.glLoadIdentity();}
}
/** Program’s main entry point
-
@param args command line arguments.
*/
public static void main(String[] args)
{
Frame frame = new Frame(“Lesson 2: Your First Polygon”);
GLCanvas canvas = new GLCanvas();
canvas.addGLEventListener(new Renderer());
frame.add(canvas);
frame.setSize(640, 480);
frame.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
frame.setVisible(true);
canvas.requestFocus();
}
}