www.pudn.com > openglbk.rar > torus.c

/* 
 * Copyright (c) 1993-1999, Silicon Graphics, Inc. 
 * ALL RIGHTS RESERVED  
 * Permission to use, copy, modify, and distribute this software for  
 * any purpose and without fee is hereby granted, provided that the above 
 * copyright notice appear in all copies and that both the copyright notice 
 * and this permission notice appear in supporting documentation, and that  
 * the name of Silicon Graphics, Inc. not be used in advertising 
 * or publicity pertaining to distribution of the software without specific, 
 * written prior permission.  
 * 
 * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS" 
 * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE, 
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR 
 * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON 
 * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT, 
 * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY 
 * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION, 
 * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF 
 * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN 
 * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON 
 * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE 
 * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE. 
 *  
 * US Government Users Restricted Rights  
 * Use, duplication, or disclosure by the Government is subject to 
 * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph 
 * (c)(1)(ii) of the Rights in Technical Data and Computer Software 
 * clause at DFARS 252.227-7013 and/or in similar or successor 
 * clauses in the FAR or the DOD or NASA FAR Supplement. 
 * Unpublished-- rights reserved under the copyright laws of the 
 * United States.  Contractor/manufacturer is Silicon Graphics, 
 * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311. 
 * 
 * OpenGL(R) is a registered trademark of Silicon Graphics, Inc. 
 */ 
 
/* 
 *  torus.c 
 *  This program demonstrates the creation of a display list. 
 */ 
 
#include  
#include  
#include  
#include  
 
#define PI_ 3.14159265358979323846 
 
GLuint theTorus; 
 
/* Draw a torus */ 
static void torus(int numc, int numt) 
{ 
   int i, j, k; 
   double s, t, x, y, z, twopi; 
 
   twopi = 2 * PI_; 
   for (i = 0; i < numc; i++) { 
      glBegin(GL_QUAD_STRIP); 
      for (j = 0; j <= numt; j++) { 
         for (k = 1; k >= 0; k--) { 
            s = (i + k) % numc + 0.5; 
            t = j % numt; 
 
            x = (1+.1*cos(s*twopi/numc))*cos(t*twopi/numt); 
            y = (1+.1*cos(s*twopi/numc))*sin(t*twopi/numt); 
            z = .1 * sin(s * twopi / numc); 
            glVertex3f(x, y, z); 
         } 
      } 
      glEnd(); 
   } 
} 
 
/* Create display list with Torus and initialize state */ 
static void init(void) 
{ 
   theTorus = glGenLists (1); 
   glNewList(theTorus, GL_COMPILE); 
   torus(8, 25); 
   glEndList(); 
 
   glShadeModel(GL_FLAT); 
   glClearColor(0.0, 0.0, 0.0, 0.0); 
} 
 
/* Clear window and draw torus */ 
void display(void) 
{ 
   glClear(GL_COLOR_BUFFER_BIT); 
   glColor3f (1.0, 1.0, 1.0); 
   glCallList(theTorus); 
   glFlush(); 
} 
 
/* Handle window resize */ 
void reshape(int w, int h) 
{ 
   glViewport(0, 0, (GLsizei) w, (GLsizei) h); 
   glMatrixMode(GL_PROJECTION); 
   glLoadIdentity(); 
   gluPerspective(30, (GLfloat) w/(GLfloat) h, 1.0, 100.0); 
   glMatrixMode(GL_MODELVIEW); 
   glLoadIdentity(); 
   gluLookAt(0, 0, 10, 0, 0, 0, 0, 1, 0); 
} 
 
/* Rotate about x-axis when "x" typed; rotate about y-axis 
   when "y" typed; "i" returns torus to original view */ 
void keyboard(unsigned char key, int x, int y) 
{ 
   switch (key) { 
   case 'x': 
   case 'X': 
      glRotatef(30.,1.0,0.0,0.0); 
      glutPostRedisplay(); 
      break; 
   case 'y': 
   case 'Y': 
      glRotatef(30.,0.0,1.0,0.0); 
      glutPostRedisplay(); 
      break; 
   case 'i': 
   case 'I': 
      glLoadIdentity(); 
      gluLookAt(0, 0, 10, 0, 0, 0, 0, 1, 0); 
      glutPostRedisplay(); 
      break; 
   case 27: 
      exit(0); 
      break; 
   } 
} 
 
int main(int argc, char **argv) 
{ 
   glutInitWindowSize(200, 200); 
   glutInit(&argc, argv); 
   glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB); 
   glutCreateWindow(argv[0]); 
   init(); 
   glutReshapeFunc(reshape); 
   glutKeyboardFunc(keyboard); 
   glutDisplayFunc(display); 
   glutMainLoop(); 
   return 0; 
}