DISK.C

/* 
 * (c) Copyright 1993, Silicon Graphics, Inc. 
 *               1993-1995 Microsoft Corporation 
 * 
 * ALL RIGHTS RESERVED 
 * 
 * Please refer to OpenGL/readme.txt for additional information 
 * 
 */ 
 
/* 
 *  disk.c 
 *  This program demonstrates the use of the quadrics 
 *  Utility Library routines to draw circles and arcs. 
 */ 
#include "glos.h" 
 
#include <GL/gl.h> 
#include <GL/glu.h> 
#include <GL/glaux.h> 
 
void myinit(void); 
void CALLBACK myReshape(GLsizei w, GLsizei h); 
void CALLBACK display(void); 
 
GLUquadricObj * quadObj; 
 
/*  Clear the screen.  For each triangle, set the current  
 *  color and modify the modelview matrix. 
 */ 
void CALLBACK display(void) 
{ 
    glClearColor (0.0, 0.0, 0.0, 1.0); 
    glClear (GL_COLOR_BUFFER_BIT); 
 
    glPushMatrix(); 
    gluQuadricDrawStyle (quadObj, GLU_FILL); 
    glColor3f (1.0, 1.0, 1.0); 
    glTranslatef (10.0, 10.0, 0.0); 
    gluDisk (quadObj, 0.0, 5.0, 10, 2); 
    glPopMatrix(); 
 
    glPushMatrix(); 
    glColor3f (1.0, 1.0, 0.0); 
    glTranslatef (20.0, 20.0, 0.0); 
    gluPartialDisk (quadObj, 0.0, 5.0, 10, 3, 30.0, 120.0); 
    glPopMatrix(); 
 
    glPushMatrix(); 
    gluQuadricDrawStyle (quadObj, GLU_SILHOUETTE); 
    glColor3f (0.0, 1.0, 1.0); 
    glTranslatef (30.0, 30.0, 0.0); 
    gluPartialDisk (quadObj, 0.0, 5.0, 10, 3, 135.0, 270.0); 
    glPopMatrix(); 
 
    glPushMatrix(); 
    gluQuadricDrawStyle (quadObj, GLU_LINE); 
    glColor3f (1.0, 0.0, 1.0); 
    glTranslatef (40.0, 40.0, 0.0); 
    gluDisk (quadObj, 2.0, 5.0, 10, 10); 
    glPopMatrix(); 
    glFlush(); 
} 
 
void myinit (void) { 
    quadObj = gluNewQuadric (); 
    glShadeModel(GL_FLAT); 
} 
 
void CALLBACK myReshape(GLsizei w, GLsizei h) 
{ 
    if (!h) return; 
    glViewport(0, 0, w, h); 
    glMatrixMode(GL_PROJECTION); 
    glLoadIdentity(); 
    if (w <= h)  
    glOrtho (0.0, 50.0,  
        0.0, 50.0*(GLfloat)h/(GLfloat)w, -1.0, 1.0); 
    else  
    glOrtho (0.0, 50.0*(GLfloat)w/(GLfloat)h,  
        0.0, 50.0, -1.0, 1.0); 
    glMatrixMode(GL_MODELVIEW); 
    glLoadIdentity (); 
} 
 
/*  Main Loop 
 *  Open window with initial window size, title bar,  
 *  RGBA display mode, and handle input events. 
 */ 
int main(int argc, char** argv) 
{ 
    auxInitDisplayMode (AUX_SINGLE | AUX_RGB); 
    auxInitPosition (0, 0, 500, 500); 
    auxInitWindow ("Quadrics"); 
    myinit (); 
    auxReshapeFunc (myReshape); 
    auxMainLoop(display); 
    return(0); 
}