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C/C++ Source or Header  |  1997-10-25  |  2KB  |  128 lines
  1. #include "g_local.h"
  2.  
  3.  
  4. /*
  5. ==============================================================================
  6.  
  7. PLAYER TRAIL
  8.  
  9. ==============================================================================
  10.  
  11. This is a circular list containing the a list of points of where
  12. the player has been recently.  It is used by monsters for pursuit.
  13.  
  14. .origin        the spot
  15. .owner        forward link
  16. .aiment        backward link
  17. */
  18.  
  19.  
  20. #define    TRAIL_LENGTH    8
  21.  
  22. edict_t        *trail[TRAIL_LENGTH];
  23. int            trail_head;
  24. qboolean    trail_active = false;
  25.  
  26. #define NEXT(n)        (((n) + 1) & (TRAIL_LENGTH - 1))
  27. #define PREV(n)        (((n) - 1) & (TRAIL_LENGTH - 1))
  28.  
  29.  
  30. void PlayerTrail_Init (void)
  31. {
  32.     int        n;
  33.  
  34.     if (deathmatch->value /* FIXME || coop */)
  35.         return;
  36.  
  37.     for (n = 0; n < TRAIL_LENGTH; n++)
  38.     {
  39.         trail[n] = G_Spawn();
  40.         trail[n]->classname = "player_trail";
  41.     }
  42.  
  43.     trail_head = 0;
  44.     trail_active = true;
  45. }
  46.  
  47.  
  48. void PlayerTrail_Add (vec3_t spot)
  49. {
  50.     vec3_t    temp;
  51.  
  52.     if (!trail_active)
  53.         return;
  54.  
  55.     VectorCopy (spot, trail[trail_head]->s.origin);
  56.  
  57.     trail[trail_head]->timestamp = level.time;
  58.  
  59.     VectorSubtract (spot, trail[PREV(trail_head)]->s.origin, temp);
  60.     trail[trail_head]->s.angles[1] = vectoyaw (temp);
  61.  
  62.     trail_head = NEXT(trail_head);
  63. }
  64.  
  65.  
  66. void PlayerTrail_New (vec3_t spot)
  67. {
  68.     if (!trail_active)
  69.         return;
  70.  
  71.     PlayerTrail_Init ();
  72.     PlayerTrail_Add (spot);
  73. }
  74.  
  75.  
  76. edict_t *PlayerTrail_PickFirst (edict_t *self)
  77. {
  78.     int        marker;
  79.     int        n;
  80.  
  81.     if (!trail_active)
  82.         return NULL;
  83.  
  84.     for (marker = trail_head, n = TRAIL_LENGTH; n; n--)
  85.     {
  86.         if(trail[marker]->timestamp <= self->monsterinfo.trail_time)
  87.             marker = NEXT(marker);
  88.         else
  89.             break;
  90.     }
  91.  
  92.     if (visible(self, trail[marker]))
  93.     {
  94.         return trail[marker];
  95.     }
  96.  
  97.     if (visible(self, trail[PREV(marker)]))
  98.     {
  99.         return trail[PREV(marker)];
  100.     }
  101.  
  102.     return trail[marker];
  103. }
  104.  
  105. edict_t *PlayerTrail_PickNext (edict_t *self)
  106. {
  107.     int        marker;
  108.     int        n;
  109.  
  110.     if (!trail_active)
  111.         return NULL;
  112.  
  113.     for (marker = trail_head, n = TRAIL_LENGTH; n; n--)
  114.     {
  115.         if(trail[marker]->timestamp <= self->monsterinfo.trail_time)
  116.             marker = NEXT(marker);
  117.         else
  118.             break;
  119.     }
  120.  
  121.     return trail[marker];
  122. }
  123.  
  124. edict_t *PlayerTrail_LastSpot (void)
  125. {
  126.     return trail[trail_head];
  127. }
  128.