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- /*
- Copyright (C) 1997-2001 Id Software, Inc.
-
- This program is free software; you can redistribute it and/or
- modify it under the terms of the GNU General Public License
- as published by the Free Software Foundation; either version 2
- of the License, or (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-
- See the GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-
- */
- #include "g_local.h"
-
-
- /*
- ==============================================================================
-
- PLAYER TRAIL
-
- ==============================================================================
-
- This is a circular list containing the a list of points of where
- the player has been recently. It is used by monsters for pursuit.
-
- .origin the spot
- .owner forward link
- .aiment backward link
- */
-
-
- #define TRAIL_LENGTH 8
-
- edict_t *trail[TRAIL_LENGTH];
- int trail_head;
- qboolean trail_active = false;
-
- #define NEXT(n) (((n) + 1) & (TRAIL_LENGTH - 1))
- #define PREV(n) (((n) - 1) & (TRAIL_LENGTH - 1))
-
-
- void PlayerTrail_Init (void)
- {
- int n;
-
- if (deathmatch->value /* FIXME || coop */)
- return;
-
- for (n = 0; n < TRAIL_LENGTH; n++)
- {
- trail[n] = G_Spawn();
- trail[n]->classname = "player_trail";
- }
-
- trail_head = 0;
- trail_active = true;
- }
-
-
- void PlayerTrail_Add (vec3_t spot)
- {
- vec3_t temp;
-
- if (!trail_active)
- return;
-
- VectorCopy (spot, trail[trail_head]->s.origin);
-
- trail[trail_head]->timestamp = level.time;
-
- VectorSubtract (spot, trail[PREV(trail_head)]->s.origin, temp);
- trail[trail_head]->s.angles[1] = vectoyaw (temp);
-
- trail_head = NEXT(trail_head);
- }
-
-
- void PlayerTrail_New (vec3_t spot)
- {
- if (!trail_active)
- return;
-
- PlayerTrail_Init ();
- PlayerTrail_Add (spot);
- }
-
-
- edict_t *PlayerTrail_PickFirst (edict_t *self)
- {
- int marker;
- int n;
-
- if (!trail_active)
- return NULL;
-
- for (marker = trail_head, n = TRAIL_LENGTH; n; n--)
- {
- if(trail[marker]->timestamp <= self->monsterinfo.trail_time)
- marker = NEXT(marker);
- else
- break;
- }
-
- if (visible(self, trail[marker]))
- {
- return trail[marker];
- }
-
- if (visible(self, trail[PREV(marker)]))
- {
- return trail[PREV(marker)];
- }
-
- return trail[marker];
- }
-
- edict_t *PlayerTrail_PickNext (edict_t *self)
- {
- int marker;
- int n;
-
- if (!trail_active)
- return NULL;
-
- for (marker = trail_head, n = TRAIL_LENGTH; n; n--)
- {
- if(trail[marker]->timestamp <= self->monsterinfo.trail_time)
- marker = NEXT(marker);
- else
- break;
- }
-
- return trail[marker];
- }
-
- edict_t *PlayerTrail_LastSpot (void)
- {
- return trail[PREV(trail_head)];
- }
-