progs/redbook/planet.c

   1 /*
   2  * Copyright (c) 1993-1997, Silicon Graphics, Inc.
   3  * ALL RIGHTS RESERVED
   4  * Permission to use, copy, modify, and distribute this software for
   5  * any purpose and without fee is hereby granted, provided that the above
   6  * copyright notice appear in all copies and that both the copyright notice
   7  * and this permission notice appear in supporting documentation, and that
   8  * the name of Silicon Graphics, Inc. not be used in advertising
   9  * or publicity pertaining to distribution of the software without specific,
  10  * written prior permission.
  11  *
  12  * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
  13  * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
  14  * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
  15  * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
  16  * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
  17  * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
  18  * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
  19  * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
  20  * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
  21  * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
  22  * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
  23  * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
  24  *
  25  * US Government Users Restricted Rights
  26  * Use, duplication, or disclosure by the Government is subject to
  27  * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
  28  * (c)(1)(ii) of the Rights in Technical Data and Computer Software
  29  * clause at DFARS 252.227-7013 and/or in similar or successor
  30  * clauses in the FAR or the DOD or NASA FAR Supplement.
  31  * Unpublished-- rights reserved under the copyright laws of the
  32  * United States.  Contractor/manufacturer is Silicon Graphics,
  33  * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
  34  *
  35  * OpenGL(R) is a registered trademark of Silicon Graphics, Inc.
  36  */
  37
  38 /*
  39  *  planet.c
  40  *  This program shows how to composite modeling transformations
  41  *  to draw translated and rotated models.
  42  *  Interaction:  pressing the d and y keys (day and year)
  43  *  alters the rotation of the planet around the sun.
  44  */
  45 #include <GL/glut.h>
  46 #include <stdlib.h>
  47
  48 static int year = 0, day = 0;
  49
  50 void init(void)
  51 {
  52    glClearColor (0.0, 0.0, 0.0, 0.0);
  53    glShadeModel (GL_FLAT);
  54 }
  55
  56 void display(void)
  57 {
  58    glClear (GL_COLOR_BUFFER_BIT);
  59    glColor3f (1.0, 1.0, 1.0);
  60
  61    glPushMatrix();
  62    glutWireSphere(1.0, 20, 16);   /* draw sun */
  63    glRotatef ((GLfloat) year, 0.0, 1.0, 0.0);
  64    glTranslatef (2.0, 0.0, 0.0);
  65    glRotatef ((GLfloat) day, 0.0, 1.0, 0.0);
  66    glutWireSphere(0.2, 10, 8);    /* draw smaller planet */
  67    glPopMatrix();
  68    glutSwapBuffers();
  69 }
  70
  71 void reshape (int w, int h)
  72 {
  73    glViewport (0, 0, (GLsizei) w, (GLsizei) h);
  74    glMatrixMode (GL_PROJECTION);
  75    glLoadIdentity ();
  76    gluPerspective(60.0, (GLfloat) w/(GLfloat) h, 1.0, 20.0);
  77    glMatrixMode(GL_MODELVIEW);
  78    glLoadIdentity();
  79    gluLookAt (0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
  80 }
  81
  82 /* ARGSUSED1 */
  83 void keyboard (unsigned char key, int x, int y)
  84 {
  85    switch (key) {
  86       case 'd':
  87          day = (day + 10) % 360;
  88          glutPostRedisplay();
  89          break;
  90       case 'D':
  91          day = (day - 10) % 360;
  92          glutPostRedisplay();
  93          break;
  94       case 'y':
  95          year = (year + 5) % 360;
  96          glutPostRedisplay();
  97          break;
  98       case 'Y':
  99          year = (year - 5) % 360;
 100          glutPostRedisplay();
 101          break;
 102       case 27:
 103          exit(0);
 104          break;
 105       default:
 106          break;
 107    }
 108 }
 109
 110 int main(int argc, char** argv)
 111 {
 112    glutInit(&argc, argv);
 113    glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB);
 114    glutInitWindowSize (500, 500);
 115    glutInitWindowPosition (100, 100);
 116    glutCreateWindow (argv[0]);
 117    init ();
 118    glutDisplayFunc(display);
 119    glutReshapeFunc(reshape);
 120    glutKeyboardFunc(keyboard);
 121    glutMainLoop();
 122    return 0;
 123 }