demos/particle/space.h

   1 /*****************************************************************************
   2  * This file is part of gfxprim library.                                     *
   3  *                                                                           *
   4  * Gfxprim is free software; you can redistribute it and/or                  *
   5  * modify it under the terms of the GNU Lesser General Public                *
   6  * License as published by the Free Software Foundation; either              *
   7  * version 2.1 of the License, or (at your option) any later version.        *
   8  *                                                                           *
   9  * Gfxprim is distributed in the hope that it will be useful,                *
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU         *
  12  * Lesser General Public License for more details.                           *
  13  *                                                                           *
  14  * You should have received a copy of the GNU Lesser General Public          *
  15  * License along with gfxprim; if not, write to the Free Software            *
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor,                        *
  17  * Boston, MA  02110-1301  USA                                               *
  18  *                                                                           *
  19  * Copyright (C) 2009-2012 Cyril Hrubis <metan@ucw.cz>                       *
  20  *                                                                           *
  21  *****************************************************************************/
  22
  23  /*
  24
  25    Particle demo.
  26
  27   */
  28
  29 #ifndef PARTICLE_H
  30 #define PARTICLE_H
  31
  32 #include <GP.h>
  33
  34 struct particle {
  35         /* fixed point coordinates */
  36         int x;
  37         int y;
  38
  39         /* fixed point speed */
  40         int vx;
  41         int vy;
  42 };
  43
  44 struct space {
  45         unsigned int particle_count;
  46
  47         /* space is an rectanle */
  48         int min_w;
  49         int min_h;
  50
  51         int max_w;
  52         int max_h;
  53
  54         /* gravitation vector */
  55         int gax;
  56         int gay;
  57
  58         /* elasticity at the boudaries */
  59         int elasticity;
  60
  61         /* particle mass */
  62         int mass_kappa;
  63
  64         struct particle particles[];
  65 };
  66
  67 struct space *space_create(unsigned int particle_count, int min_w, int min_h,
  68                            int max_w, int max_h);
  69
  70 void space_destroy(struct space *space);
  71
  72 void space_draw_particles(GP_Pixmap *pixmap, struct space *space);
  73
  74 void space_time_tick(struct space *space, int time);
  75
  76 #endif /* PARTICLE_H */