/** * @(#) 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 ) { } } }