package glredbook11;
import javax.swing.*;
import javax.media.opengl.*;
import javax.media.opengl.glu.*;
import java.awt.event.*;
/**
* This program demonstrates the creation of a display list.
*
* @author Kiet Le (java port)
*/
public class torus
extends JFrame
implements GLEventListener, KeyListener
{
private GLCanvas canvas;
private GLCapabilities caps;
private int theTorus;
private KeyEvent key;
private float angleX = 30f;
private float angleY = 30f;
public torus()
{
super("torus");
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(512, 512);
setLocationRelativeTo(null);
setVisible(true);
}
public static void main(String[] args)
{
new torus().run();
}
private void drawTorus(GL gl, int numc, int numt)
{
double s, t, x, y, z, twopi = 2 * Math.PI;
for (int i = 0; i < numc; i++)
{
gl.glBegin(GL.GL_QUAD_STRIP);
for (int j = 0; j <= numt; j++)
{
for (int k = 1; k >= 0; k--)
{
s = (i + k) % numc + 0.5;
t = j % numt;
x = (1 + 0.1 * Math.cos(s * twopi / numc))
* Math.cos(t * twopi / numt);
y = (1 + 0.1 * Math.cos(s * twopi / numc))
* Math.sin(t * twopi / numt);
z = 0.1 * Math.sin(s * twopi / numc);
gl.glVertex3d(x, y, z);
}// k
}// j
gl.glEnd();
}// i
}
public void init(GLAutoDrawable drawable)
{
GL gl = drawable.getGL();
theTorus = gl.glGenLists(1);
gl.glNewList(theTorus, GL.GL_COMPILE);
drawTorus(gl, 8, 25);
gl.glEndList();
gl.glShadeModel(GL.GL_FLAT);
gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
}
public void display(GLAutoDrawable drawable)
{
GL gl = drawable.getGL();
GLU glu = new GLU();
//
gl.glClear(GL.GL_COLOR_BUFFER_BIT);
//
if (key != null)
{
switch (key.getKeyCode()) {
case KeyEvent.VK_X:
gl.glRotated(angleX, 1f, 0f, 0f);
break;
case KeyEvent.VK_Y:
gl.glRotated(angleY, 0f, 1f, 0f);
break;
case KeyEvent.VK_I:
gl.glLoadIdentity();
glu.gluLookAt(0, 0, 10, 0, 0, 0, 0, 1, 0);
break;
default:
break;
}
}
gl.glColor3f(1.0f, 1.0f, 1.0f);
gl.glCallList(theTorus);
gl.glPopMatrix();
gl.glFlush();
}
public void reshape(GLAutoDrawable drawable, int x, int y, int width,
int height)
{
GL gl = drawable.getGL();
GLU glu = new GLU();
//
gl.glViewport(0, 0, width, height);
gl.glMatrixMode(GL.GL_PROJECTION);
gl.glLoadIdentity();
glu.gluPerspective(30, (float) width / (float) height, 1.0, 100.0);
gl.glMatrixMode(GL.GL_MODELVIEW);
gl.glLoadIdentity();
glu.gluLookAt(0, 0, 10, 0, 0, 0, 0, 1, 0);
}
public void displayChanged(GLAutoDrawable drawable, boolean modeChanged,
boolean deviceChanged)
{
}
public void keyTyped(KeyEvent key)
{
}
public void keyPressed(KeyEvent key)
{
this.key = key;
switch (key.getKeyCode()) {
case KeyEvent.VK_ESCAPE:
System.exit(0);
break;
default:
break;
}
canvas.display();
}
public void keyReleased(KeyEvent key)
{
}
}
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