mirror of
https://gitea.nishi.boats/pyrite-dev/milsko
synced 2025-12-31 06:30:52 +00:00
244 lines
6.4 KiB
C
244 lines
6.4 KiB
C
#define TITLE "gears"
|
|
#include "glutlayer.c"
|
|
|
|
/*
|
|
* 3-D gear wheels. This program is in the public domain.
|
|
*
|
|
* Brian Paul
|
|
*/
|
|
|
|
/* Conversion to GLUT by Mark J. Kilgard */
|
|
|
|
#include <math.h>
|
|
#include <stdlib.h>
|
|
|
|
#ifndef M_PI
|
|
#define M_PI 3.14159265
|
|
#endif
|
|
|
|
/**
|
|
|
|
Draw a gear wheel. You'll probably want to call this function when
|
|
building a display list since we do a lot of trig here.
|
|
|
|
Input: inner_radius - radius of hole at center
|
|
outer_radius - radius at center of teeth
|
|
width - width of gear
|
|
teeth - number of teeth
|
|
tooth_depth - depth of tooth
|
|
|
|
**/
|
|
|
|
static void gear(GLfloat inner_radius, GLfloat outer_radius, GLfloat width, GLint teeth, GLfloat tooth_depth) {
|
|
GLint i;
|
|
GLfloat r0, r1, r2;
|
|
GLfloat angle, da;
|
|
GLfloat u, v, len;
|
|
|
|
r0 = inner_radius;
|
|
r1 = outer_radius - tooth_depth / 2.0;
|
|
r2 = outer_radius + tooth_depth / 2.0;
|
|
|
|
da = 2.0 * M_PI / teeth / 4.0;
|
|
|
|
glShadeModel(GL_FLAT);
|
|
|
|
glNormal3f(0.0, 0.0, 1.0);
|
|
|
|
/* draw front face */
|
|
glBegin(GL_QUAD_STRIP);
|
|
for(i = 0; i <= teeth; i++) {
|
|
angle = i * 2.0 * M_PI / teeth;
|
|
glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
|
|
glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
|
|
glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
|
|
glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), width * 0.5);
|
|
}
|
|
glEnd();
|
|
|
|
/* draw front sides of teeth */
|
|
glBegin(GL_QUADS);
|
|
da = 2.0 * M_PI / teeth / 4.0;
|
|
for(i = 0; i < teeth; i++) {
|
|
angle = i * 2.0 * M_PI / teeth;
|
|
|
|
glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
|
|
glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5);
|
|
glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), width * 0.5);
|
|
glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), width * 0.5);
|
|
}
|
|
glEnd();
|
|
|
|
glNormal3f(0.0, 0.0, -1.0);
|
|
|
|
/* draw back face */
|
|
glBegin(GL_QUAD_STRIP);
|
|
for(i = 0; i <= teeth; i++) {
|
|
angle = i * 2.0 * M_PI / teeth;
|
|
glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
|
|
glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
|
|
glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -width * 0.5);
|
|
glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
|
|
}
|
|
glEnd();
|
|
|
|
/* draw back sides of teeth */
|
|
glBegin(GL_QUADS);
|
|
da = 2.0 * M_PI / teeth / 4.0;
|
|
for(i = 0; i < teeth; i++) {
|
|
angle = i * 2.0 * M_PI / teeth;
|
|
|
|
glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -width * 0.5);
|
|
glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), -width * 0.5);
|
|
glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5);
|
|
glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
|
|
}
|
|
glEnd();
|
|
|
|
/* draw outward faces of teeth */
|
|
glBegin(GL_QUAD_STRIP);
|
|
for(i = 0; i < teeth; i++) {
|
|
angle = i * 2.0 * M_PI / teeth;
|
|
|
|
glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
|
|
glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
|
|
u = r2 * cos(angle + da) - r1 * cos(angle);
|
|
v = r2 * sin(angle + da) - r1 * sin(angle);
|
|
len = sqrt(u * u + v * v);
|
|
u /= len;
|
|
v /= len;
|
|
glNormal3f(v, -u, 0.0);
|
|
glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5);
|
|
glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5);
|
|
glNormal3f(cos(angle), sin(angle), 0.0);
|
|
glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), width * 0.5);
|
|
glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), -width * 0.5);
|
|
u = r1 * cos(angle + 3 * da) - r2 * cos(angle + 2 * da);
|
|
v = r1 * sin(angle + 3 * da) - r2 * sin(angle + 2 * da);
|
|
glNormal3f(v, -u, 0.0);
|
|
glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), width * 0.5);
|
|
glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -width * 0.5);
|
|
glNormal3f(cos(angle), sin(angle), 0.0);
|
|
}
|
|
|
|
glVertex3f(r1 * cos(0), r1 * sin(0), width * 0.5);
|
|
glVertex3f(r1 * cos(0), r1 * sin(0), -width * 0.5);
|
|
|
|
glEnd();
|
|
|
|
glShadeModel(GL_SMOOTH);
|
|
|
|
/* draw inside radius cylinder */
|
|
glBegin(GL_QUAD_STRIP);
|
|
for(i = 0; i <= teeth; i++) {
|
|
angle = i * 2.0 * M_PI / teeth;
|
|
|
|
glNormal3f(-cos(angle), -sin(angle), 0.0);
|
|
glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
|
|
glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
|
|
}
|
|
glEnd();
|
|
}
|
|
|
|
static GLfloat view_rotx = 20.0, view_roty = 30.0, view_rotz = 0.0;
|
|
static GLint gear1, gear2, gear3;
|
|
static GLfloat angle = 0.0;
|
|
|
|
static void draw(void) {
|
|
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
|
|
|
|
glPushMatrix();
|
|
glRotatef(view_rotx, 1.0, 0.0, 0.0);
|
|
glRotatef(view_roty, 0.0, 1.0, 0.0);
|
|
glRotatef(view_rotz, 0.0, 0.0, 1.0);
|
|
|
|
glPushMatrix();
|
|
glTranslatef(-3.0, -2.0, 0.0);
|
|
glRotatef(angle, 0.0, 0.0, 1.0);
|
|
glCallList(gear1);
|
|
glPopMatrix();
|
|
|
|
glPushMatrix();
|
|
glTranslatef(3.1, -2.0, 0.0);
|
|
glRotatef(-2.0 * angle - 9.0, 0.0, 0.0, 1.0);
|
|
glCallList(gear2);
|
|
glPopMatrix();
|
|
|
|
glPushMatrix();
|
|
glTranslatef(-3.1, 4.2, 0.0);
|
|
glRotatef(-2.0 * angle - 25.0, 0.0, 0.0, 1.0);
|
|
glCallList(gear3);
|
|
glPopMatrix();
|
|
|
|
glPopMatrix();
|
|
}
|
|
|
|
static void idle(void) {
|
|
angle += 2.0;
|
|
}
|
|
|
|
/* new window size or exposure */
|
|
static void reshape(int width, int height) {
|
|
GLfloat h = (GLfloat)height / (GLfloat)width;
|
|
|
|
glViewport(0, 0, (GLint)width, (GLint)height);
|
|
glMatrixMode(GL_PROJECTION);
|
|
glLoadIdentity();
|
|
glFrustum(-1.0, 1.0, -h, h, 5.0, 60.0);
|
|
glMatrixMode(GL_MODELVIEW);
|
|
glLoadIdentity();
|
|
glTranslatef(0.0, 0.0, -40.0);
|
|
}
|
|
|
|
static void init(void) {
|
|
static GLfloat pos[4] =
|
|
{5.0, 5.0, 10.0, 0.0};
|
|
static GLfloat red[4] =
|
|
{0.8, 0.1, 0.0, 1.0};
|
|
static GLfloat green[4] =
|
|
{0.0, 0.8, 0.2, 1.0};
|
|
static GLfloat blue[4] =
|
|
{0.2, 0.2, 1.0, 1.0};
|
|
|
|
glLightfv(GL_LIGHT0, GL_POSITION, pos);
|
|
glEnable(GL_CULL_FACE);
|
|
glEnable(GL_LIGHTING);
|
|
glEnable(GL_LIGHT0);
|
|
glEnable(GL_DEPTH_TEST);
|
|
|
|
/* make the gears */
|
|
gear1 = glGenLists(1);
|
|
glNewList(gear1, GL_COMPILE);
|
|
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red);
|
|
gear(1.0, 4.0, 1.0, 20, 0.7);
|
|
glEndList();
|
|
|
|
gear2 = glGenLists(1);
|
|
glNewList(gear2, GL_COMPILE);
|
|
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green);
|
|
gear(0.5, 2.0, 2.0, 10, 0.7);
|
|
glEndList();
|
|
|
|
gear3 = glGenLists(1);
|
|
glNewList(gear3, GL_COMPILE);
|
|
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue);
|
|
gear(1.3, 2.0, 0.5, 10, 0.7);
|
|
glEndList();
|
|
|
|
glEnable(GL_NORMALIZE);
|
|
}
|
|
|
|
static void key(int k) {
|
|
(void)k;
|
|
|
|
if(k == MwLLKeyLeft) {
|
|
view_roty += 5.0;
|
|
} else if(k == MwLLKeyRight) {
|
|
view_roty -= 5.0;
|
|
} else if(k == MwLLKeyUp) {
|
|
view_rotx += 5.0;
|
|
} else if(k == MwLLKeyDown) {
|
|
view_rotx -= 5.0;
|
|
}
|
|
}
|