OpenGLUT 0.6.3 development - OpenGLUT: torus.c File Reference
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# torus.c File Reference

## Detailed Description

This program demonstrates the creation of a display list.

    /*
     * Copyright (c) 1993-1997, 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     * Unpublished-- rights reserved under the copyright laws of the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.
     */

    #include <GL/openglut.h>
    #include <stdio.h>
    #include <math.h>
    #include <stdlib.h>

    /* Some <math.h> files do not define M_PI... */
    #ifndef M_PI
    #define M_PI 3.14159265358979323846
    #endif

    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 * (double)M_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 */
    /* ARGSUSED1 */
    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;
    }

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