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This program demonstrates smooth shading. A smooth shaded polygon is drawn in
a 2-D projection. The example is ported from C examples in the OpenGL Programming Guide (known as the "red book").
-> Copyright and Permission Notice
package glredbook10;
import java.awt.event.*;
import javax.swing.*;
import javax.media.opengl.*;
import javax.media.opengl.glu.*;
import com.sun.opengl.util.*;
/**
* This program demonstrates smooth shading. A smooth shaded polygon is drawn in
* a 2-D projection.
*
* @author Kiet Le (java port)
*/
public class smooth
extends JFrame
implements GLEventListener, KeyListener
{
private GLU glu;
private GLUT glut;
private GLCapabilities caps;
private GLCanvas canvas;
public smooth()
{
super("smooth");
caps = new GLCapabilities();
canvas = new GLCanvas(caps);
canvas.addGLEventListener(this);
canvas.addKeyListener(this);
getContentPane().add(canvas);
}
public void run()
{
setSize(500, 500);
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
canvas.requestFocusInWindow();
}
public static void main(String[] args)
{
new smooth().run();
}
public void init(GLAutoDrawable drawable)
{
GL gl = drawable.getGL();
glu = new GLU();
glut = new GLUT();
// gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
gl.glShadeModel(GL.GL_SMOOTH);
}
public void display(GLAutoDrawable drawable)
{
GL gl = drawable.getGL();
gl.glClear(GL.GL_COLOR_BUFFER_BIT);
triangle(gl);
gl.glFlush();
}
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) glu.gluOrtho2D(0.0, 30.0, 0.0, 30.0 * (float) h / (float) w);
else glu.gluOrtho2D(0.0, 30.0 * (float) w / (float) h, 0.0, 30.0);
gl.glMatrixMode(GL.GL_MODELVIEW);
}
public void displayChanged(GLAutoDrawable drawable, boolean modeChanged,
boolean deviceChanged)
{
}
private void triangle(GL gl)
{
gl.glBegin(GL.GL_TRIANGLES);
gl.glColor3f(1.0f, 0.0f, 0.0f);
gl.glVertex2f(5.0f, 5.0f);
gl.glColor3f(0.0f, 1.0f, 0.0f);
gl.glVertex2f(25.0f, 5.0f);
gl.glColor3f(0.0f, 0.0f, 1.0f);
gl.glVertex2f(5.0f, 25.0f);
gl.glEnd();
}
public void keyTyped(KeyEvent key)
{
}
public void keyPressed(KeyEvent key)
{
switch (key.getKeyCode()) {
case KeyEvent.VK_ESCAPE:
System.exit(0);
break;
default:
break;
}
}
public void keyReleased(KeyEvent key)
{
}
}
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Source:
Kiet Le's The Red Book Examples using JOGL
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