src/game/RandomMovementGenerator.cpp

   1 /*
   2  * Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program 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
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19 #include "Creature.h"
  20 #include "MapManager.h"
  21 #include "RandomMovementGenerator.h"
  22 #include "DestinationHolderImp.h"
  23 #include "Map.h"
  24 #include "Util.h"
  25
  26 #define RUNNING_CHANCE_RANDOMMV 20                                  //will be "1 / RUNNING_CHANCE_RANDOMMV"
  27
  28 template<>
  29 void
  30 RandomMovementGenerator<Creature>::_setRandomLocation(Creature &creature)
  31 {
  32     float X,Y,Z,z,nx,ny,nz,wander_distance,ori,dist;
  33
  34     creature.GetRespawnCoord(X, Y, Z, &ori, &wander_distance);
  35
  36     z = creature.GetPositionZ();
  37     uint32 mapid=creature.GetMapId();
  38     Map const* map = MapManager::Instance().GetBaseMap(mapid);
  39
  40     // For 2D/3D system selection
  41     //bool is_land_ok  = creature.canWalk();                // not used?
  42     //bool is_water_ok = creature.canSwim();                // not used?
  43     bool is_air_ok   = creature.canFly();
  44
  45     const float angle = rand_norm()*(M_PI*2);
  46     const float range = rand_norm()*wander_distance;
  47     const float distanceX = range * cos(angle);
  48     const float distanceY = range * sin(angle);
  49
  50     nx = X + distanceX;
  51     ny = Y + distanceY;
  52
  53     // prevent invalid coordinates generation
  54     MaNGOS::NormalizeMapCoord(nx);
  55     MaNGOS::NormalizeMapCoord(ny);
  56
  57     dist = distanceX*distanceX + distanceY*distanceY;
  58
  59     if (is_air_ok) // 3D system above ground and above water (flying mode)
  60     {
  61         const float distanceZ = rand_norm() * sqrtf(dist)/2; // Limit height change
  62         nz = Z + distanceZ;
  63         float tz = map->GetHeight(nx, ny, nz-2.0f, false); // Map check only, vmap needed here but need to alter vmaps checks for height.
  64         float wz = map->GetWaterLevel(nx, ny);
  65         if (tz >= nz || wz >= nz)
  66             return; // Problem here, we must fly above the ground and water, not under. Let's try on next tick
  67     }
  68     //else if (is_water_ok) // 3D system under water and above ground (swimming mode)
  69     else // 2D only
  70     {
  71         dist = dist>=100.0f ? 10.0f : sqrtf(dist); // 10.0 is the max that vmap high can check (MAX_CAN_FALL_DISTANCE)
  72         // The fastest way to get an accurate result 90% of the time.
  73         // Better result can be obtained like 99% accuracy with a ray light, but the cost is too high and the code is too long.
  74         nz = map->GetHeight(nx,ny,Z+dist-2.0f,false); // Map check
  75         if (fabs(nz-Z)>dist)
  76         {
  77             nz = map->GetHeight(nx,ny,Z-2.0f,true); // Vmap Horizontal or above
  78             if (fabs(nz-Z)>dist)
  79             {
  80                 nz = map->GetHeight(nx,ny,Z+dist-2.0f,true); // Vmap Higher
  81                 if (fabs(nz-Z)>dist)
  82                     return; // let's forget this bad coords where a z cannot be find and retry at next tick
  83             }
  84         }
  85     }
  86
  87     Traveller<Creature> traveller(creature);
  88     creature.SetOrientation(creature.GetAngle(nx,ny));
  89     i_destinationHolder.SetDestination(traveller, nx, ny, nz);
  90     creature.addUnitState(UNIT_STAT_ROAMING);
  91     if (is_air_ok)
  92     {
  93         i_nextMoveTime.Reset(i_destinationHolder.GetTotalTravelTime());
  94         creature.AddUnitMovementFlag(MOVEMENTFLAG_FLYING2);
  95     }
  96     //else if (is_water_ok) // Swimming mode to be done with more than this check
  97     else
  98     {
  99         i_nextMoveTime.Reset(urand(500+i_destinationHolder.GetTotalTravelTime(),5000+i_destinationHolder.GetTotalTravelTime()));
 100         creature.SetUnitMovementFlags(MOVEMENTFLAG_WALK_MODE);
 101     }
 102 }
 103
 104 template<>
 105 void
 106 RandomMovementGenerator<Creature>::Initialize(Creature &creature)
 107 {
 108     if(!creature.isAlive())
 109         return;
 110
 111     if (creature.canFly())
 112         creature.AddUnitMovementFlag(MOVEMENTFLAG_FLYING2);
 113     else
 114         creature.SetUnitMovementFlags(irand(0,RUNNING_CHANCE_RANDOMMV) > 0 ? MOVEMENTFLAG_WALK_MODE : MOVEMENTFLAG_NONE );
 115     _setRandomLocation(creature);
 116 }
 117
 118 template<>
 119 void
 120 RandomMovementGenerator<Creature>::Reset(Creature &creature)
 121 {
 122     Initialize(creature);
 123 }
 124
 125 template<>
 126 bool
 127 RandomMovementGenerator<Creature>::Update(Creature &creature, const uint32 &diff)
 128 {
 129     if(creature.hasUnitState(UNIT_STAT_ROOT | UNIT_STAT_STUNNED | UNIT_STAT_DISTRACTED))
 130     {
 131         i_nextMoveTime.Update(i_nextMoveTime.GetExpiry());    // Expire the timer
 132         creature.clearUnitState(UNIT_STAT_ROAMING);
 133         return true;
 134     }
 135
 136     i_nextMoveTime.Update(diff);
 137
 138     if(i_destinationHolder.HasArrived() && !creature.IsStopped() && !creature.canFly())
 139         creature.clearUnitState(UNIT_STAT_ROAMING);
 140
 141     if(!i_destinationHolder.HasArrived() && creature.IsStopped())
 142         creature.addUnitState(UNIT_STAT_ROAMING);
 143
 144     CreatureTraveller traveller(creature);
 145
 146     if( i_destinationHolder.UpdateTraveller(traveller, diff, false, true) )
 147     {
 148         if(i_nextMoveTime.Passed())
 149         {
 150             if (creature.canFly())
 151                 creature.AddUnitMovementFlag(MOVEMENTFLAG_FLYING2);
 152             else
 153                 creature.SetUnitMovementFlags(irand(0,RUNNING_CHANCE_RANDOMMV) > 0 ? MOVEMENTFLAG_WALK_MODE : MOVEMENTFLAG_NONE);
 154             _setRandomLocation(creature);
 155         }
 156         else if(creature.isPet() && creature.GetOwner() && creature.GetDistance(creature.GetOwner()) > PET_FOLLOW_DIST+2.5f)
 157         {
 158            creature.SetUnitMovementFlags(MOVEMENTFLAG_NONE);
 159            _setRandomLocation(creature);
 160         }
 161     }
 162     return true;
 163 }