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How to make and execute a display list |
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This program demonstrates how to make and execute a display list. Note that attributes, such as current color and matrix, are changed. 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.*;
/**
* This program demonstrates how to make and execute a display list. Note that
* attributes, such as current color and matrix, are changed.
*
* @author Kiet Le (Java conversion)
*/
public class list
extends JFrame
implements GLEventListener, KeyListener
{
private GLCanvas canvas;
private GLCapabilities caps;
private int listName;
public list()
{
super("list");
caps = new GLCapabilities();
canvas = new GLCanvas(caps);
canvas.addGLEventListener(this);
canvas.addKeyListener(this);
getContentPane().add(canvas);
}
public void run()
{
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(400, 50);
setLocationRelativeTo(null);
setVisible(true);
canvas.requestFocusInWindow();
}
public static void main(String[] args)
{
new list().run();
}
public void init(GLAutoDrawable drawable)
{
GL gl = drawable.getGL();
//
listName = gl.glGenLists(1);
gl.glNewList(listName, GL.GL_COMPILE);
gl.glColor3f(1f, 0f, 0f);
gl.glBegin(GL.GL_TRIANGLES);
gl.glVertex2f(0f, 0f);
gl.glVertex2f(1f, 0f);
gl.glVertex2f(0f, 1f);
gl.glEnd();
gl.glTranslatef(1.5f, 0f, 0f);
gl.glEndList();
gl.glShadeModel(GL.GL_FLAT);
}
public void display(GLAutoDrawable drawable)
{
GL gl = drawable.getGL();
//
gl.glClear(GL.GL_COLOR_BUFFER_BIT);
gl.glColor3f(0f, 1f, 0f);// has not affect
for (int i = 0; i < 10; i++)
gl.glCallList(listName);
drawLine(gl); // * is this line green? NO! where is the line drawn?
gl.glFlush();
}
public void reshape(GLAutoDrawable drawable, int x, int y, int w, int h)
{
GL gl = drawable.getGL();
GLU glu = new GLU();
//
gl.glViewport(0, 0, w, h);
gl.glMatrixMode(GL.GL_PROJECTION);
gl.glLoadIdentity();
if (w <= h) glu.gluOrtho2D(0.0, 2.0, -0.5 * (float) h / (float) w,
1.5 * (float) h / (float) w);
else glu.gluOrtho2D(0.0, 2.0 * (float) w / (float) h, -0.5, 1.5);
gl.glMatrixMode(GL.GL_MODELVIEW);
gl.glLoadIdentity();
}
public void displayChanged(GLAutoDrawable drawable, boolean modeChanged,
boolean deviceChanged)
{
}
private void drawLine(GL gl)
{
gl.glBegin(GL.GL_LINES);
gl.glVertex2f(0f, 0.5f);
gl.glVertex2f(15f, .05f);
gl.glEnd();
}
public void keyTyped(KeyEvent arg0)
{
}
public void keyPressed(KeyEvent key)
{
switch (key.getKeyCode()) {
case KeyEvent.VK_ESCAPE:
System.exit(0);
break;
default:
break;
}
}
public void keyReleased(KeyEvent arg0)
{
}
}
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Source:
Kiet Le's The Red Book Examples using JOGL
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