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403 lines
10 KiB
C
403 lines
10 KiB
C
/* gears.c */
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/*
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* 3-D gear wheels. This program is in the public domain.
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*
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* Brian Paul
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*
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*
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* Modified to work under Togl as a widget for TK 1997
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*
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* Philip Quaife
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*
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*/
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#include "togl.h"
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#include <math.h>
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#include <stdlib.h>
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#include <string.h>
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#ifndef M_PI
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# define M_PI 3.14159265
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#endif
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struct WHIRLYGIZMO
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{
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GLint Gear1, Gear2, Gear3;
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GLfloat Rotx, Roty, Rotz;
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GLfloat Angle;
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int Height, Width;
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};
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/*
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* Draw a gear wheel. You'll probably want to call this function when
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* building a display list since we do a lot of trig here.
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*
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* Input: inner_radius - radius of hole at center
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* outer_radius - radius at center of teeth
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* width - width of gear
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* teeth - number of teeth
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* tooth_depth - depth of tooth
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*/
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static void
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gear(GLfloat inner_radius, GLfloat outer_radius, GLfloat width,
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GLint teeth, GLfloat tooth_depth)
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{
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GLint i;
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GLfloat r0, r1, r2;
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GLfloat angle, da;
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GLfloat u, v, len;
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r0 = inner_radius;
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r1 = outer_radius - tooth_depth / 2.0;
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r2 = outer_radius + tooth_depth / 2.0;
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da = 2.0 * M_PI / teeth / 4.0;
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glShadeModel(GL_FLAT);
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glNormal3f(0.0, 0.0, 1.0);
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/* draw front face */
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glBegin(GL_QUAD_STRIP);
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for (i = 0; i <= teeth; i++) {
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angle = i * 2.0 * M_PI / teeth;
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glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
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glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
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glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
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glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
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width * 0.5);
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}
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glEnd();
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/* draw front sides of teeth */
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glBegin(GL_QUADS);
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da = 2.0 * M_PI / teeth / 4.0;
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for (i = 0; i < teeth; i++) {
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angle = i * 2.0 * M_PI / teeth;
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glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
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glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5);
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glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
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width * 0.5);
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glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
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width * 0.5);
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}
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glEnd();
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glNormal3f(0.0, 0.0, -1.0);
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/* draw back face */
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glBegin(GL_QUAD_STRIP);
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for (i = 0; i <= teeth; i++) {
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angle = i * 2.0 * M_PI / teeth;
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glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
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glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
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glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
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-width * 0.5);
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glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
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}
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glEnd();
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/* draw back sides of teeth */
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glBegin(GL_QUADS);
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da = 2.0 * M_PI / teeth / 4.0;
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for (i = 0; i < teeth; i++) {
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angle = i * 2.0 * M_PI / teeth;
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glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
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-width * 0.5);
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glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
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-width * 0.5);
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glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5);
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glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
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}
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glEnd();
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/* draw outward faces of teeth */
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glBegin(GL_QUAD_STRIP);
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for (i = 0; i < teeth; i++) {
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angle = i * 2.0 * M_PI / teeth;
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glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
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glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
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u = r2 * cos(angle + da) - r1 * cos(angle);
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v = r2 * sin(angle + da) - r1 * sin(angle);
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len = sqrt(u * u + v * v);
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u /= len;
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v /= len;
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glNormal3f(v, -u, 0.0);
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glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5);
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glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5);
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glNormal3f(cos(angle), sin(angle), 0.0);
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glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
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width * 0.5);
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glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
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-width * 0.5);
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u = r1 * cos(angle + 3 * da) - r2 * cos(angle + 2 * da);
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v = r1 * sin(angle + 3 * da) - r2 * sin(angle + 2 * da);
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glNormal3f(v, -u, 0.0);
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glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
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width * 0.5);
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glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
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-width * 0.5);
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glNormal3f(cos(angle), sin(angle), 0.0);
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}
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glVertex3f(r1 * cos(0), r1 * sin(0), width * 0.5);
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glVertex3f(r1 * cos(0), r1 * sin(0), -width * 0.5);
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glEnd();
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glShadeModel(GL_SMOOTH);
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/* draw inside radius cylinder */
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glBegin(GL_QUAD_STRIP);
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for (i = 0; i <= teeth; i++) {
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angle = i * 2.0 * M_PI / teeth;
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glNormal3f(-cos(angle), -sin(angle), 0.0);
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glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
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glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
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}
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glEnd();
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}
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/*
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* static GLfloat view_rotx=20.0, view_roty=30.0, view_rotz=0.0; static GLint
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* gear1, gear2, gear3; static GLfloat angle = 0.0; */
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static GLuint limit;
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static GLuint count = 1;
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static GLubyte polycolor[4] = { 255, 255, 255, 255 };
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static void
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draw(Togl *togl)
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{
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struct WHIRLYGIZMO *Wg;
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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Wg = Togl_GetClientData(togl);
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glDisable(GL_TEXTURE_2D);
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glPushMatrix();
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glRotatef(Wg->Rotx, 1.0, 0.0, 0.0);
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glRotatef(Wg->Roty, 0.0, 1.0, 0.0);
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glRotatef(Wg->Rotz, 0.0, 0.0, 1.0);
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glPushMatrix();
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glTranslatef(-3.0, -2.0, 0.0);
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glRotatef(Wg->Angle, 0.0, 0.0, 1.0);
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glEnable(GL_DEPTH_TEST);
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glCallList(Wg->Gear1);
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glEnable(GL_DEPTH_TEST);
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glPopMatrix();
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glPushMatrix();
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glTranslatef(3.1, -2.0, 0.0);
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glRotatef(-2.0 * Wg->Angle - 9.0, 0.0, 0.0, 1.0);
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glCallList(Wg->Gear2);
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glPopMatrix();
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glPushMatrix();
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glTranslatef(-3.1, 4.2, 0.0);
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glRotatef(-2.0 * Wg->Angle - 25.0, 0.0, 0.0, 1.0);
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glCallList(Wg->Gear3);
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glPopMatrix();
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glPopMatrix();
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Togl_SwapBuffers(togl);
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}
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static void
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zap(Togl *togl)
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{
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struct WHIRLYGIZMO *Wg;
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Wg = Togl_GetClientData(togl);
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free(Wg);
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}
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static void
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idle(Togl *togl)
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{
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struct WHIRLYGIZMO *Wg;
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Wg = Togl_GetClientData(togl);
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Wg->Angle += 2.0;
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Togl_PostRedisplay(togl);
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}
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/* change view angle, exit upon ESC */
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/*
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* static GLenum key(int k, GLenum mask) { switch (k) { case TK_UP: view_rotx
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* += 5.0; return GL_TRUE; case TK_DOWN: view_rotx -= 5.0; return GL_TRUE; case
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* TK_LEFT: view_roty += 5.0; return GL_TRUE; case TK_RIGHT: view_roty -= 5.0;
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* return GL_TRUE; case TK_z: view_rotz += 5.0; return GL_TRUE; case TK_Z:
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* view_rotz -= 5.0; return GL_TRUE; } return GL_FALSE; } */
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/* new window size or exposure */
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static void
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reshape(Togl *togl)
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{
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int width, height;
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width = Togl_Width(togl);
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height = Togl_Height(togl);
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glViewport(0, 0, (GLint) width, (GLint) height);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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if (width > height) {
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GLfloat w = (GLfloat) width / (GLfloat) height;
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glFrustum(-w, w, -1.0, 1.0, 5.0, 60.0);
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} else {
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GLfloat h = (GLfloat) height / (GLfloat) width;
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glFrustum(-1.0, 1.0, -h, h, 5.0, 60.0);
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}
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glTranslatef(0.0, 0.0, -40.0);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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}
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static void
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init(Togl *togl)
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{
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struct WHIRLYGIZMO *Wg;
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static GLfloat red[4] = { 0.8, 0.1, 0.0, 1.0 };
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static GLfloat green[4] = { 0.0, 0.8, 0.2, 1.0 };
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static GLfloat blue[4] = { 0.2, 0.2, 1.0, 1.0 };
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static GLfloat pos[4] = { 5.0, 5.0, 10.0, 0.0 };
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glLightfv(GL_LIGHT0, GL_POSITION, pos);
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glEnable(GL_CULL_FACE);
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glEnable(GL_LIGHTING);
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glEnable(GL_LIGHT0);
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glEnable(GL_DEPTH_TEST);
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/* make the gears */
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Wg = malloc(sizeof (*Wg));
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if (!Wg) {
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Tcl_SetResult(Togl_Interp(togl),
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"\"Cannot allocate client data for widget\"", TCL_STATIC);
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}
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Wg->Gear1 = glGenLists(1);
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glNewList(Wg->Gear1, GL_COMPILE);
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glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red);
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gear(1.0, 4.0, 1.0, 20, 0.7);
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glEndList();
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Wg->Gear2 = glGenLists(1);
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glNewList(Wg->Gear2, GL_COMPILE);
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glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green);
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gear(0.5, 2.0, 2.0, 10, 0.7);
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glEndList();
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Wg->Gear3 = glGenLists(1);
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glNewList(Wg->Gear3, GL_COMPILE);
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glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue);
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gear(1.3, 2.0, 0.5, 10, 0.7);
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glEndList();
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glEnable(GL_NORMALIZE);
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Wg->Height = Togl_Height(togl);
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Wg->Width = Togl_Width(togl);
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Wg->Angle = 0.0;
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Wg->Rotx = 0.0;
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Wg->Roty = 0.0;
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Wg->Rotz = 0.0;
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Togl_SetClientData(togl, (ClientData) Wg);
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}
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int
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position(Togl *togl, int argc, CONST84 char *argv[])
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{
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struct WHIRLYGIZMO *Wg;
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Tcl_Interp *interp = Togl_Interp(togl);
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char Result[100];
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Wg = Togl_GetClientData(togl);
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/* error checking */
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if (argc != 2) {
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Tcl_SetResult(interp,
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"wrong # args: should be \"pathName \"", TCL_STATIC);
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return TCL_ERROR;
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}
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/* Let result string equal value */
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sprintf(Result, "%g %g", Wg->Roty, Wg->Rotx);
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Tcl_SetResult(interp, Result, TCL_VOLATILE);
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return TCL_OK;
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}
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int
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rotate(Togl *togl, int argc, CONST84 char *argv[])
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{
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struct WHIRLYGIZMO *Wg;
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Tcl_Interp *interp = Togl_Interp(togl);
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Wg = Togl_GetClientData(togl);
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/* error checking */
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if (argc != 4) {
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Tcl_SetResult(interp,
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"wrong # args: should be \"pathName xrot yrot\"", TCL_STATIC);
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return TCL_ERROR;
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}
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Wg->Roty = atof(argv[2]);
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Wg->Rotx = atof(argv[3]);
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Togl_PostRedisplay(togl);
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/* Let result string equal value */
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strcpy(interp->result, argv[2]);
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return TCL_OK;
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}
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TOGL_EXTERN int
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Gears_Init(Tcl_Interp *interp)
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{
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/*
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* Initialize Tcl, Tk, and the Togl widget module.
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*/
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#ifdef USE_TCL_STUBS
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if (Tcl_InitStubs(interp, "8.1", 0) == NULL) {
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return TCL_ERROR;
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}
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#endif
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#ifdef USE_TK_STUBS
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if (Tk_InitStubs(interp, "8.1", 0) == NULL) {
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return TCL_ERROR;
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}
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#endif
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if (Togl_Init(interp) == TCL_ERROR) {
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return TCL_ERROR;
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}
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/*
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* Specify the C callback functions for widget creation, display,
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* and reshape.
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*/
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Togl_CreateFunc(init);
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Togl_DestroyFunc(zap);
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Togl_DisplayFunc(draw);
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Togl_ReshapeFunc(reshape);
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Togl_TimerFunc(idle);
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Togl_CreateCommand("rotate", rotate);
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Togl_CreateCommand("position", position);
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return TCL_OK;
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}
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