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/**
* @(#) gears.java
* @(#) author: Brian Paul (converted to Java by Ron Cemer and Sven Goethel)
*
* This version is equal to Brian Paul's version 1.2 1999/10/21
*/
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.lang.*;
import java.util.*;
import java.io.*;
import java.util.*;
import gl4java.GLContext;
import gl4java.awt.GLAnimCanvas;
import gl4java.applet.SimpleGLAnimApplet1;
public class gears extends SimpleGLAnimApplet1
{
/* Initialize the applet */
public void init()
{
super.init();
Dimension d = getSize();
canvas = new gearsCanvas(d.width, d.height);
add("Center", canvas);
}
public static void main( String args[] )
{
Frame mainFrame = new Frame("gears");
gears applet = new gears();
applet.setSize(300, 300);
applet.init();
applet.start();
mainFrame.add(applet);
mainFrame.pack();
mainFrame.setVisible(true);
}
/* Local GLAnimCanvas extension class */
private class gearsCanvas extends GLAnimCanvas implements MouseListener, MouseMotionListener
{
private static final float M_PI = 3.14159265f;
private long T0 = 0;
private long Frames = 0;
private float view_rotx = 20.0f, view_roty = 30.0f, view_rotz = 0.0f;
private int gear1, gear2, gear3;
private float angle = 0.0f;
private int prevMouseX, prevMouseY;
private boolean mouseRButtonDown = false;
public gearsCanvas(int w, int h)
{
super(w, h);
GLContext.gljNativeDebug = false;
GLContext.gljClassDebug = false;
setAnimateFps(30.0);
}
public void preInit()
{
doubleBuffer = true;
stereoView = false;
}
public void init()
{
System.out.println("init(): " + this);
reshape(getSize().width, getSize().height);
float pos[] = { 5.0f, 5.0f, 10.0f, 0.0f };
float red[] = { 0.8f, 0.1f, 0.0f, 1.0f };
float green[] = { 0.0f, 0.8f, 0.2f, 1.0f };
float blue[] = { 0.2f, 0.2f, 1.0f, 1.0f };
gl.glLightfv(GL_LIGHT0, GL_POSITION, pos);
gl.glEnable(GL_CULL_FACE);
gl.glEnable(GL_LIGHTING);
gl.glEnable(GL_LIGHT0);
gl.glEnable(GL_DEPTH_TEST);
/* make the gears */
gear1 = gl.glGenLists(1);
gl.glNewList(gear1, GL_COMPILE);
gl.glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red);
gear(1.0f, 4.0f, 1.0f, 20, 0.7f);
gl.glEndList();
gear2 = gl.glGenLists(1);
gl.glNewList(gear2, GL_COMPILE);
gl.glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green);
gear(0.5f, 2.0f, 2.0f, 10, 0.7f);
gl.glEndList();
gear3 = gl.glGenLists(1);
gl.glNewList(gear3, GL_COMPILE);
gl.glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue);
gear(1.3f, 2.0f, 0.5f, 10, 0.7f);
gl.glEndList();
gl.glEnable(GL_NORMALIZE);
glj.gljCheckGL();
addMouseListener(this);
addMouseMotionListener(this);
T0=System.currentTimeMillis();
}
public void doCleanup()
{
System.out.println("destroy(): " + this);
removeMouseListener(this);
removeMouseMotionListener(this);
}
public void reshape(int width, int height)
{
float h = (float)height / (float)width;
gl.glViewport(0,0,width,height);
gl.glMatrixMode(GL_PROJECTION);
gl.glLoadIdentity();
gl.glFrustum(-1.0f, 1.0f, -h, h, 5.0f, 60.0f);
gl.glMatrixMode(GL_MODELVIEW);
gl.glLoadIdentity();
gl.glTranslatef(0.0f, 0.0f, -40.0f);
}
public void display()
{
if (glj.gljMakeCurrent() == false) return;
angle += 2.0f;
gl.glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
gl.glPushMatrix();
gl.glRotatef(view_rotx, 1.0f, 0.0f, 0.0f);
gl.glRotatef(view_roty, 0.0f, 1.0f, 0.0f);
gl.glRotatef(view_rotz, 0.0f, 0.0f, 1.0f);
gl.glPushMatrix();
gl.glTranslatef(-3.0f, -2.0f, 0.0f);
gl.glRotatef(angle, 0.0f, 0.0f, 1.0f);
gl.glCallList(gear1);
gl.glPopMatrix();
gl.glPushMatrix();
gl.glTranslatef(3.1f, -2.0f, 0.0f);
gl.glRotatef(-2.0f * angle - 9.0f, 0.0f, 0.0f, 1.0f);
gl.glCallList(gear2);
gl.glPopMatrix();
gl.glPushMatrix();
gl.glTranslatef(-3.1f, 4.2f, 0.0f);
gl.glRotatef(-2.0f * angle - 25.0f, 0.0f, 0.0f, 1.0f);
gl.glCallList(gear3);
gl.glPopMatrix();
gl.glPopMatrix();
glj.gljSwap();
glj.gljCheckGL();
glj.gljFree();
Frames++;
long t=System.currentTimeMillis();
if(t - T0 >= 5000)
{
double seconds = (double)(t - T0) / 1000.0;
double fps = (double)Frames / seconds;
System.out.println(Frames+" frames in "+seconds+" seconds = "+
fps+" FPS");
T0 = t;
Frames = 0;
}
}
private void gear
(float inner_radius,
float outer_radius,
float width,
int teeth,
float tooth_depth)
{
int i;
float r0, r1, r2;
float angle, da;
float u, v, len;
r0 = inner_radius;
r1 = outer_radius - tooth_depth / 2.0f;
r2 = outer_radius + tooth_depth / 2.0f;
da = 2.0f * M_PI / teeth / 4.0f;
gl.glShadeModel(GL_FLAT);
gl.glNormal3f(0.0f, 0.0f, 1.0f);
/* draw front face */
gl.glBegin(GL_QUAD_STRIP);
for (i = 0; i <= teeth; i++)
{
angle = i * 2.0f * M_PI / teeth;
gl.glVertex3f(r0 * (float)Math.cos(angle), r0 * (float)Math.sin(angle), width * 0.5f);
gl.glVertex3f(r1 * (float)Math.cos(angle), r1 * (float)Math.sin(angle), width * 0.5f);
if(i < teeth)
{
gl.glVertex3f(r0 * (float)Math.cos(angle), r0 * (float)Math.sin(angle), width * 0.5f);
gl.glVertex3f(r1 * (float)Math.cos(angle + 3.0f * da), r1 * (float)Math.sin(angle + 3.0f * da), width * 0.5f);
}
}
gl.glEnd();
/* draw front sides of teeth */
gl.glBegin(GL_QUADS);
for (i = 0; i < teeth; i++)
{
angle = i * 2.0f * M_PI / teeth;
gl.glVertex3f(r1 * (float)Math.cos(angle), r1 * (float)Math.sin(angle), width * 0.5f);
gl.glVertex3f(r2 * (float)Math.cos(angle + da), r2 * (float)Math.sin(angle + da), width * 0.5f);
gl.glVertex3f(r2 * (float)Math.cos(angle + 2.0f * da), r2 * (float)Math.sin(angle + 2.0f * da), width * 0.5f);
gl.glVertex3f(r1 * (float)Math.cos(angle + 3.0f * da), r1 * (float)Math.sin(angle + 3.0f * da), width * 0.5f);
}
gl.glEnd();
/* draw back face */
gl.glBegin(GL_QUAD_STRIP);
for (i = 0; i <= teeth; i++)
{
angle = i * 2.0f * M_PI / teeth;
gl.glVertex3f(r1 * (float)Math.cos(angle), r1 * (float)Math.sin(angle), -width * 0.5f);
gl.glVertex3f(r0 * (float)Math.cos(angle), r0 * (float)Math.sin(angle), -width * 0.5f);
gl.glVertex3f(r1 * (float)Math.cos(angle + 3 * da), r1 * (float)Math.sin(angle + 3 * da), -width * 0.5f);
gl.glVertex3f(r0 * (float)Math.cos(angle), r0 * (float)Math.sin(angle), -width * 0.5f);
}
gl.glEnd();
/* draw back sides of teeth */
gl.glBegin(GL_QUADS);
for (i = 0; i < teeth; i++)
{
angle = i * 2.0f * M_PI / teeth;
gl.glVertex3f(r1 * (float)Math.cos(angle + 3 * da), r1 * (float)Math.sin(angle + 3 * da), -width * 0.5f);
gl.glVertex3f(r2 * (float)Math.cos(angle + 2 * da), r2 * (float)Math.sin(angle + 2 * da), -width * 0.5f);
gl.glVertex3f(r2 * (float)Math.cos(angle + da), r2 * (float)Math.sin(angle + da), -width * 0.5f);
gl.glVertex3f(r1 * (float)Math.cos(angle), r1 * (float)Math.sin(angle), -width * 0.5f);
}
gl.glEnd();
/* draw outward faces of teeth */
gl.glBegin(GL_QUAD_STRIP);
for (i = 0; i < teeth; i++)
{
angle = i * 2.0f * M_PI / teeth;
gl.glVertex3f(r1 * (float)Math.cos(angle), r1 * (float)Math.sin(angle), width * 0.5f);
gl.glVertex3f(r1 * (float)Math.cos(angle), r1 * (float)Math.sin(angle), -width * 0.5f);
u = r2 * (float)Math.cos(angle + da) - r1 * (float)Math.cos(angle);
v = r2 * (float)Math.sin(angle + da) - r1 * (float)Math.sin(angle);
len = (float)Math.sqrt(u * u + v * v);
u /= len;
v /= len;
gl.glNormal3f(v, -u, 0.0f);
gl.glVertex3f(r2 * (float)Math.cos(angle + da), r2 * (float)Math.sin(angle + da), width * 0.5f);
gl.glVertex3f(r2 * (float)Math.cos(angle + da), r2 * (float)Math.sin(angle + da), -width * 0.5f);
gl.glNormal3f((float)Math.cos(angle), (float)Math.sin(angle), 0.0f);
gl.glVertex3f(r2 * (float)Math.cos(angle + 2 * da), r2 * (float)Math.sin(angle + 2 * da), width * 0.5f);
gl.glVertex3f(r2 * (float)Math.cos(angle + 2 * da), r2 * (float)Math.sin(angle + 2 * da), -width * 0.5f);
u = r1 * (float)Math.cos(angle + 3 * da) - r2 * (float)Math.cos(angle + 2 * da);
v = r1 * (float)Math.sin(angle + 3 * da) - r2 * (float)Math.sin(angle + 2 * da);
gl.glNormal3f(v, -u, 0.0f);
gl.glVertex3f(r1 * (float)Math.cos(angle + 3 * da), r1 * (float)Math.sin(angle + 3 * da), width * 0.5f);
gl.glVertex3f(r1 * (float)Math.cos(angle + 3 * da), r1 * (float)Math.sin(angle + 3 * da), -width * 0.5f);
gl.glNormal3f((float)Math.cos(angle), (float)Math.sin(angle), 0.0f);
}
gl.glVertex3f(r1 * (float)Math.cos(0), r1 * (float)Math.sin(0), width * 0.5f);
gl.glVertex3f(r1 * (float)Math.cos(0), r1 * (float)Math.sin(0), -width * 0.5f);
gl.glEnd();
gl.glShadeModel(GL_SMOOTH);
/* draw inside radius cylinder */
gl.glBegin(GL_QUAD_STRIP);
for (i = 0; i <= teeth; i++)
{
angle = i * 2.0f * M_PI / teeth;
gl.glNormal3f(-(float)Math.cos(angle), -(float)Math.sin(angle), 0.0f);
gl.glVertex3f(r0 * (float)Math.cos(angle), r0 * (float)Math.sin(angle), -width * 0.5f);
gl.glVertex3f(r0 * (float)Math.cos(angle), r0 * (float)Math.sin(angle), width * 0.5f);
}
gl.glEnd();
}
// Methods required for the implementation of MouseListener
public void mouseEntered( MouseEvent evt )
{
}
public void mouseExited( MouseEvent evt )
{
}
public void mousePressed( MouseEvent evt )
{
prevMouseX = evt.getX();
prevMouseY = evt.getY();
if ((evt.getModifiers() & evt.BUTTON3_MASK) != 0)
{
mouseRButtonDown = true;
evt.consume();
}
}
public void mouseReleased( MouseEvent evt )
{
if ((evt.getModifiers() & evt.BUTTON3_MASK) != 0)
{
mouseRButtonDown = false;
evt.consume();
}
}
public void mouseClicked( MouseEvent evt )
{
}
// Methods required for the implementation of MouseMotionListener
public void mouseDragged( MouseEvent evt )
{
int x = evt.getX();
int y = evt.getY();
Dimension size = getSize();
float thetaY = 360.0f * ( (float)(x-prevMouseX)/(float)size.width);
float thetaX = 360.0f * ( (float)(prevMouseY-y)/(float)size.height);
prevMouseX = x;
prevMouseY = y;
view_rotx += thetaX;
view_roty += thetaY;
evt.consume();
}
public void mouseMoved( MouseEvent evt )
{
}
}
}
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