src/collision.c

   1 //
   2 // C Implementation: collision
   3 //
   4 // Description:
   5 //
   6 //
   7 // Author: Tobias Glaesser <tobi.web@gmx.de>, (C) 2004
   8 //
   9 // Copyright: See COPYING file that comes with this distribution
  10 //
  11 //
  12
  13 #include "defines.h"
  14 #include "collision.h"
  15 #include "bitmask.h"
  16 #include "scene.h"
  17
  18 int rectcollision(base_type* one, base_type* two)
  19 {
  20
  21   if (one->x >= two->x - one->width &&
  22       one->x <= two->x + two->width  &&
  23       one->y >= two->y - one->height &&
  24       one->y <= two->y + two->height )
  25     {
  26       return YES;
  27     }
  28   else
  29     {
  30       return NO;
  31     }
  32 }
  33
  34 int rectcollision_offset(base_type* one, base_type* two, float off_x, float off_y)
  35 {
  36
  37   if (one->x >= two->x - one->width +off_x &&
  38       one->x <= two->x + two->width + off_x &&
  39       one->y >= two->y - one->height + off_y &&
  40       one->y <= two->y + two->height + off_y )
  41     {
  42       return YES;
  43     }
  44   else
  45     {
  46       return NO;
  47     }
  48 }
  49
  50 void collision_handler()
  51 {
  52   int i,j;
  53
  54   /* CO_BULLET & CO_BADGUY check */
  55   for(i = 0; i < num_bullets; ++i)
  56     {
  57       if(bullets[i].base.alive)
  58         {
  59           for(j = 0; j < num_bad_guys; ++j)
  60             {
  61               if(bad_guys[j].dying == NO && bad_guys[j].base.alive)
  62                 {
  63                   if(rectcollision(&bullets[i].base,&bad_guys[j].base) == YES)
  64                     {
  65                     /* We have detected a collision and now call the collision functions of the collided objects. */
  66                       bullet_collision(&bullets[i], CO_BADGUY);
  67                       badguy_collision(&bad_guys[j], &bullets[i], CO_BULLET);
  68                     }
  69                 }
  70             }
  71         }
  72     }
  73
  74     /* CO_BADGUY & CO_BADGUY check */
  75   for(i = 0; i < num_bad_guys; ++i)
  76     {
  77       if(bad_guys[i].base.alive)
  78         {
  79           for(j = i+1; j < num_bad_guys; ++j)
  80             {
  81               if(j != i && bad_guys[j].base.alive)
  82                 {
  83                   if(rectcollision(&bad_guys[i].base,&bad_guys[j].base) == YES)
  84                     {
  85                     /* We have detected a collision and now call the collision functions of the collided objects. */
  86                       badguy_collision(&bad_guys[j], &bad_guys[i], CO_BADGUY);
  87                     }
  88                 }
  89             }
  90         }
  91     }
  92
  93     /* CO_BADGUY & CO_PLAYER check */
  94   for(i = 0; i < num_bad_guys; ++i)
  95     {
  96       if(bad_guys[i].base.alive)
  97         {
  98                   if(bad_guys[i].dying == NO && rectcollision_offset(&bad_guys[i].base,&tux.base,0,0) == YES && tux.base.ym > 0)
  99                     {
 100                     /* We have detected a collision and now call the collision functions of the collided objects. */
 101                       badguy_collision(&bad_guys[i], &tux, CO_PLAYER);
 102                       }
 103                    if(rectcollision(&bad_guys[i].base,&tux.base) == YES)
 104                    {
 105                       player_collision(&tux, &bad_guys[i], CO_BADGUY);
 106                    }
 107
 108         }
 109     }
 110
 111     /* CO_UPGRADE & CO_PLAYER check */
 112   for(i = 0; i < num_upgrades; ++i)
 113     {
 114       if(upgrades[i].base.alive)
 115         {
 116                   if(rectcollision(&upgrades[i].base,&tux.base) == YES)
 117                     {
 118                     /* We have detected a collision and now call the collision functions of the collided objects. */
 119                       upgrade_collision(&upgrades[i], &tux, CO_PLAYER);
 120                       }
 121
 122         }
 123     }
 124
 125 }
 126
 127