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This program displays a simple 3D rendering of a polygon using JOGL. Please note though that this code is a demonstration of the use of JOGL and as such makes use of immediate mode drawing commands; this serves to show how the conventional C style API is used through JOGL, but it is strongly recommended to make use of modern OpenGL techniques.
import java.awt.*;
import java.awt.event.*;
import com.jogamp.opengl.*;
import com.jogamp.opengl.awt.GLCanvas;
import com.jogamp.opengl.fixedfunc.*;
import com.jogamp.opengl.util.Animator;
/**
* Self-contained example (within a single class only to keep it simple)
* displaying a rotating quad
*/
public class JOGLQuad implements GLEventListener {
private float rotateT = 0.0f;
@Override
public void display(GLAutoDrawable gLDrawable) {
final GL2 gl = gLDrawable.getGL().getGL2();
gl.glClear(GL.GL_COLOR_BUFFER_BIT);
gl.glClear(GL.GL_DEPTH_BUFFER_BIT);
gl.glLoadIdentity();
gl.glTranslatef(0.0f, 0.0f, -5.0f);
// rotate about the three axes
gl.glRotatef(rotateT, 1.0f, 0.0f, 0.0f);
gl.glRotatef(rotateT, 0.0f, 1.0f, 0.0f);
gl.glRotatef(rotateT, 0.0f, 0.0f, 1.0f);
// Draw A Quad
gl.glBegin(GL2.GL_QUADS);
gl.glColor3f(0.0f, 1.0f, 1.0f); // set the color of the 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
// Done Drawing The Quad
gl.glEnd();
// increasing rotation for the next iteration
rotateT += 0.2f;
}
@Override
public void init(GLAutoDrawable glDrawable) {
GL2 gl = glDrawable.getGL().getGL2();
gl.glShadeModel(GLLightingFunc.GL_SMOOTH);
gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
gl.glClearDepth(1.0f);
gl.glEnable(GL.GL_DEPTH_TEST);
gl.glDepthFunc(GL.GL_LEQUAL);
gl.glHint(GL2ES1.GL_PERSPECTIVE_CORRECTION_HINT, GL.GL_NICEST);
}
@Override
public void reshape(GLAutoDrawable gLDrawable, int x, int y, int width, int height) {
GL2 gl = gLDrawable.getGL().getGL2();
final float aspect = (float) width / (float) height;
gl.glMatrixMode(GLMatrixFunc.GL_PROJECTION);
gl.glLoadIdentity();
final float fh = 0.5f;
final float fw = fh * aspect;
gl.glFrustumf(-fw, fw, -fh, fh, 1.0f, 1000.0f);
gl.glMatrixMode(GLMatrixFunc.GL_MODELVIEW);
gl.glLoadIdentity();
}
@Override
public void dispose(GLAutoDrawable gLDrawable) {
}
public static void main(String[] args) {
final GLCanvas canvas = new GLCanvas();
final Frame frame = new Frame("Jogl Quad drawing");
final Animator animator = new Animator(canvas);
canvas.addGLEventListener(new JOGLQuad());
frame.add(canvas);
frame.setSize(640, 480);
frame.setResizable(false);
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
animator.stop();
frame.dispose();
System.exit(0);
}
});
frame.setVisible(true);
animator.start();
canvas.requestFocus();
}
}
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