153 lines
4.3 KiB
C
153 lines
4.3 KiB
C
/*
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* Copyright (c) 1993-1997, Silicon Graphics, Inc.
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* ALL RIGHTS RESERVED
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* Permission to use, copy, modify, and distribute this software for
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* any purpose and without fee is hereby granted, provided that the above
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* copyright notice appear in all copies and that both the copyright notice
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* and this permission notice appear in supporting documentation, and that
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* the name of Silicon Graphics, Inc. not be used in advertising
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* or publicity pertaining to distribution of the software without specific,
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* written prior permission.
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*
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* THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
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* AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
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* FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
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* GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
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* SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
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* KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
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* LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
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* THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
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* ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
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* POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* US Government Users Restricted Rights
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* Use, duplication, or disclosure by the Government is subject to
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* restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
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* (c)(1)(ii) of the Rights in Technical Data and Computer Software
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* clause at DFARS 252.227-7013 and/or in similar or successor
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* clauses in the FAR or the DOD or NASA FAR Supplement.
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* Unpublished-- rights reserved under the copyright laws of the
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* United States. Contractor/manufacturer is Silicon Graphics,
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* Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
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*
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* OpenGL(R) is a registered trademark of Silicon Graphics, Inc.
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*/
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/*
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* torus.c
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* This program demonstrates the creation of a display list.
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*/
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#include <GL/glut.h>
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#include <stdio.h>
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#include <math.h>
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#include <stdlib.h>
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/* Some <math.h> files do not define M_PI... */
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#ifndef M_PI
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#define M_PI 3.14159265358979323846
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#endif
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GLuint theTorus;
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/* Draw a torus */
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static void torus(int numc, int numt)
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{
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int i, j, k;
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double s, t, x, y, z, twopi;
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twopi = 2 * (double)M_PI;
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for (i = 0; i < numc; i++) {
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glBegin(GL_QUAD_STRIP);
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for (j = 0; j <= numt; j++) {
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for (k = 1; k >= 0; k--) {
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s = (i + k) % numc + 0.5;
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t = j % numt;
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x = (1+.1*cos(s*twopi/numc))*cos(t*twopi/numt);
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y = (1+.1*cos(s*twopi/numc))*sin(t*twopi/numt);
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z = .1 * sin(s * twopi / numc);
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glVertex3f(x, y, z);
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}
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}
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glEnd();
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}
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}
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/* Create display list with Torus and initialize state */
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static void init(void)
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{
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theTorus = glGenLists (1);
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glNewList(theTorus, GL_COMPILE);
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torus(8, 25);
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glEndList();
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glShadeModel(GL_FLAT);
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glClearColor(0.0, 0.0, 0.0, 0.0);
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}
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/* Clear window and draw torus */
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void display(void)
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{
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glClear(GL_COLOR_BUFFER_BIT);
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glColor3f (1.0, 1.0, 1.0);
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glCallList(theTorus);
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glFlush();
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}
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/* Handle window resize */
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void reshape(int w, int h)
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{
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glViewport(0, 0, (GLsizei) w, (GLsizei) h);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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gluPerspective(30, (GLfloat) w/(GLfloat) h, 1.0, 100.0);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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gluLookAt(0, 0, 10, 0, 0, 0, 0, 1, 0);
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}
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/* Rotate about x-axis when "x" typed; rotate about y-axis
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when "y" typed; "i" returns torus to original view */
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/* ARGSUSED1 */
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void keyboard(unsigned char key, int x, int y)
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{
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switch (key) {
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case 'x':
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case 'X':
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glRotatef(30.,1.0,0.0,0.0);
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glutPostRedisplay();
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break;
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case 'y':
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case 'Y':
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glRotatef(30.,0.0,1.0,0.0);
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glutPostRedisplay();
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break;
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case 'i':
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case 'I':
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glLoadIdentity();
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gluLookAt(0, 0, 10, 0, 0, 0, 0, 1, 0);
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glutPostRedisplay();
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break;
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case 27:
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exit(0);
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break;
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}
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}
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int main(int argc, char **argv)
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{
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glutInitWindowSize(200, 200);
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glutInit(&argc, argv);
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glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
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glutCreateWindow(argv[0]);
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init();
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glutReshapeFunc(reshape);
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glutKeyboardFunc(keyboard);
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glutDisplayFunc(display);
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glutMainLoop();
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return 0;
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}
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