package glredbook11;
import java.awt.event.*;
import javax.swing.*;
import javax.media.opengl.*;
import javax.media.opengl.glu.*;
import com.sun.opengl.util.*;
/**
* This program demonstrates polygon offset to draw a shaded polygon and its
* wireframe counterpart without ugly visual artifacts ("stitching").
*
* @author Kiet Le (java port)
*/
public class polyoff
extends JFrame
implements GLEventListener, KeyListener, MouseListener
{
private GLCapabilities caps;
private GLCanvas canvas;
private GLU glu;
private GLUT glut;
private int list;
private int spinx = 0;
private int spiny = 0;
private float tdist = 0.0f;
private float polyfactor = 1.0f;
private float polyunits = 1.0f;
public polyoff()
{
super("polyoff");// name of file as title in window bar
/*
* display mode (single buffer and RGBA)
*/
caps = new GLCapabilities();
caps.setDoubleBuffered(false);
System.out.println(caps.toString());
canvas = new GLCanvas(caps);
canvas.addGLEventListener(this);
canvas.addKeyListener(this);
canvas.addMouseListener(this);
getContentPane().add(canvas);
}
public void run()
{
setSize(512, 256);
setLocationRelativeTo(null); // center
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
canvas.requestFocusInWindow();
}
public static void main(String[] args)
{
new polyoff().run();
}
/*
* specify initial properties create display list with sphere initialize
* lighting and depth buffer
*/
public void init(GLAutoDrawable drawable)
{
GL gl = drawable.getGL();
glu = new GLU();
glut = new GLUT();
//
float light_ambient[] =
{ 0.0f, 0.0f, 0.0f, 1.0f };
float light_diffuse[] =
{ 1.0f, 1.0f, 1.0f, 1.0f };
float light_specular[] =
{ 1.0f, 1.0f, 1.0f, 1.0f };
float light_position[] =
{ 1.0f, 1.0f, 1.0f, 0.0f };
float global_ambient[] =
{ 0.2f, 0.2f, 0.2f, 1.0f };
gl.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
list = gl.glGenLists(1);
gl.glNewList(list, GL.GL_COMPILE);
glut.glutSolidSphere(1.0, 20, 12);
gl.glEndList();
gl.glEnable(GL.GL_DEPTH_TEST);
gl.glLightfv(GL.GL_LIGHT0, GL.GL_AMBIENT, light_ambient, 0);
gl.glLightfv(GL.GL_LIGHT0, GL.GL_DIFFUSE, light_diffuse, 0);
gl.glLightfv(GL.GL_LIGHT0, GL.GL_SPECULAR, light_specular, 0);
gl.glLightfv(GL.GL_LIGHT0, GL.GL_POSITION, light_position, 0);
gl.glLightModelfv(GL.GL_LIGHT_MODEL_AMBIENT, global_ambient, 0);
}
/*
* display() draws two spheres, one with a gray, diffuse material, the other
* sphere with a magenta material with a specular highlight.
*/
public void display(GLAutoDrawable drawable)
{
GL gl = drawable.getGL();
/* clear all pixels */
double mat_ambient[] =
{ 0.8, 0.8, 0.8, 1.0 };
double mat_diffuse[] =
{ 1.0, 0.0, 0.5, 1.0 };
double mat_specular[] =
{ 1.0, 1.0, 1.0, 1.0 };
float gray[] =
{ 0.8f, 0.8f, 0.8f, 1.0f };
float black[] =
{ 0.0f, 0.0f, 0.0f, 1.0f };
gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
gl.glPushMatrix();
gl.glTranslated(0.0, 0.0, tdist);
gl.glRotated((double) spinx, 1.0, 0.0, 0.0);
gl.glRotated((double) spiny, 0.0, 1.0, 0.0);
gl.glMaterialfv(GL.GL_FRONT, GL.GL_AMBIENT_AND_DIFFUSE, gray, 0);
gl.glMaterialfv(GL.GL_FRONT, GL.GL_SPECULAR, black, 0);
gl.glMaterialf(GL.GL_FRONT, GL.GL_SHININESS, 0.0f);
gl.glEnable(GL.GL_LIGHTING);
gl.glEnable(GL.GL_LIGHT0);
gl.glEnable(GL.GL_POLYGON_OFFSET_FILL);
gl.glPolygonOffset(polyfactor, polyunits);
gl.glCallList(list);
gl.glDisable(GL.GL_POLYGON_OFFSET_FILL);
gl.glDisable(GL.GL_LIGHTING);
gl.glDisable(GL.GL_LIGHT0);
gl.glColor3d(1.0, 1.0, 1.0);
gl.glPolygonMode(GL.GL_FRONT_AND_BACK, GL.GL_LINE);
gl.glCallList(list);
gl.glPolygonMode(GL.GL_FRONT_AND_BACK, GL.GL_FILL);
gl.glPopMatrix();
gl.glFlush();
}
/* call when window is resized */
public void reshape(GLAutoDrawable drawable, int x, int y, int width,
int height)
{
GL gl = drawable.getGL();
//
gl.glViewport(0, 0, width, height);
gl.glMatrixMode(GL.GL_PROJECTION);
gl.glLoadIdentity();
glu.gluPerspective(45.0, (double) width / (double) height, 1.0, 10.0);
gl.glMatrixMode(GL.GL_MODELVIEW);
gl.glLoadIdentity();
glu.gluLookAt(0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
}
public void displayChanged(GLAutoDrawable drawable, boolean modeChanged,
boolean deviceChanged)
{
}
public void keyTyped(KeyEvent key)
{
}
public void keyPressed(KeyEvent key)
{
switch (key.getKeyChar()) {
case 't':
if (tdist < 4.0) tdist = (tdist + 0.5f);
break;
case 'T':
if (tdist > -5.0) tdist = (tdist - 0.5f);
break;
case 'F':
polyfactor = polyfactor + 0.1f;
System.out.println("polyfactor is " + polyfactor);
break;
case 'f':
polyfactor = polyfactor - 0.1f;
System.out.println("polyfactor is " + polyfactor);
break;
case 'U':
polyunits = polyunits + 1.0f;
System.out.println("polyunits is " + polyunits);
break;
case 'u':
polyunits = polyunits - 1.0f;
System.out.println("polyunits is " + polyunits);
break;
default:
break;
}
canvas.display();
}
public void keyReleased(KeyEvent key)
{
}
public void mouseClicked(MouseEvent mouse)
{
}
public void mousePressed(MouseEvent mouse)
{
switch (mouse.getButton()) {
case MouseEvent.BUTTON1:
spinx = (spinx + 5) % 360;
break;
case MouseEvent.BUTTON2:
spiny = (spiny + 5) % 360;
break;
default:
break;
}
canvas.display();
}
public void mouseReleased(MouseEvent mouse)
{
}
public void mouseEntered(MouseEvent mouse)
{
}
public void mouseExited(MouseEvent mouse)
{
}
}
|
Other API Tips 
You can share your information about this topic using the form below!
Please do not post your questions with this form! Thanks.