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     Map const* map = creature.GetBaseMap();
  38
  39     // For 2D/3D system selection
  40     //bool is_land_ok  = creature.canWalk();                // not used?
  41     //bool is_water_ok = creature.canSwim();                // not used?
  42     bool is_air_ok   = creature.canFly();
  43
  44     const float angle = rand_norm()*(M_PI*2);
  45     const float range = rand_norm()*wander_distance;
  46     const float distanceX = range * cos(angle);
  47     const float distanceY = range * sin(angle);
  48
  49     nx = X + distanceX;
  50     ny = Y + distanceY;
  51
  52     // prevent invalid coordinates generation
  53     MaNGOS::NormalizeMapCoord(nx);
  54     MaNGOS::NormalizeMapCoord(ny);
  55
  56     dist = distanceX*distanceX + distanceY*distanceY;
  57
  58     if (is_air_ok) // 3D system above ground and above water (flying mode)
  59     {
  60         const float distanceZ = rand_norm() * sqrtf(dist)/2; // Limit height change
  61         nz = Z + distanceZ;
  62         float tz = map->GetHeight(nx, ny, nz-2.0f, false); // Map check only, vmap needed here but need to alter vmaps checks for height.
  63         float wz = map->GetWaterLevel(nx, ny);
  64         if (tz >= nz || wz >= nz)
  65             return; // Problem here, we must fly above the ground and water, not under. Let's try on next tick
  66     }
  67     //else if (is_water_ok) // 3D system under water and above ground (swimming mode)
  68     else // 2D only
  69     {
  70         dist = dist>=100.0f ? 10.0f : sqrtf(dist); // 10.0 is the max that vmap high can check (MAX_CAN_FALL_DISTANCE)
  71         // The fastest way to get an accurate result 90% of the time.
  72         // Better result can be obtained like 99% accuracy with a ray light, but the cost is too high and the code is too long.
  73         nz = map->GetHeight(nx,ny,Z+dist-2.0f,false); // Map check
  74         if (fabs(nz-Z)>dist)
  75         {
  76             nz = map->GetHeight(nx,ny,Z-2.0f,true); // Vmap Horizontal or above
  77             if (fabs(nz-Z)>dist)
  78             {
  79                 nz = map->GetHeight(nx,ny,Z+dist-2.0f,true); // Vmap Higher
  80                 if (fabs(nz-Z)>dist)
  81                     return; // let's forget this bad coords where a z cannot be find and retry at next tick
  82             }
  83         }
  84     }
  85
  86     Traveller<Creature> traveller(creature);
  87     creature.SetOrientation(creature.GetAngle(nx,ny));
  88     i_destinationHolder.SetDestination(traveller, nx, ny, nz);
  89     creature.addUnitState(UNIT_STAT_ROAMING);
  90     if (is_air_ok)
  91     {
  92         i_nextMoveTime.Reset(i_destinationHolder.GetTotalTravelTime());
  93         creature.AddMonsterMoveFlag(MONSTER_MOVE_FLY);
  94     }
  95     //else if (is_water_ok) // Swimming mode to be done with more than this check
  96     else
  97     {
  98         i_nextMoveTime.Reset(urand(500+i_destinationHolder.GetTotalTravelTime(),5000+i_destinationHolder.GetTotalTravelTime()));
  99         creature.AddMonsterMoveFlag(MONSTER_MOVE_WALK);
 100     }
 101 }
 102
 103 template<>
 104 void
 105 RandomMovementGenerator<Creature>::Initialize(Creature &creature)
 106 {
 107     if(!creature.isAlive())
 108         return;
 109
 110     if (creature.canFly())
 111         creature.AddMonsterMoveFlag(MONSTER_MOVE_FLY);
 112
 113     else if(irand(0,RUNNING_CHANCE_RANDOMMV) > 0)
 114         creature.AddMonsterMoveFlag(MONSTER_MOVE_WALK);
 115     else
 116         creature.RemoveMonsterMoveFlag(MONSTER_MOVE_WALK);  // run with 1/RUNNING_CHANCE_RANDOMMV chance
 117
 118     _setRandomLocation(creature);
 119 }
 120
 121 template<>
 122 void
 123 RandomMovementGenerator<Creature>::Reset(Creature &creature)
 124 {
 125     Initialize(creature);
 126 }
 127
 128 template<>
 129 bool
 130 RandomMovementGenerator<Creature>::Update(Creature &creature, const uint32 &diff)
 131 {
 132     if(creature.hasUnitState(UNIT_STAT_ROOT | UNIT_STAT_STUNNED | UNIT_STAT_DISTRACTED))
 133     {
 134         i_nextMoveTime.Update(i_nextMoveTime.GetExpiry());    // Expire the timer
 135         creature.clearUnitState(UNIT_STAT_ROAMING);
 136         return true;
 137     }
 138
 139     i_nextMoveTime.Update(diff);
 140
 141     if(i_destinationHolder.HasArrived() && !creature.IsStopped() && !creature.canFly())
 142         creature.clearUnitState(UNIT_STAT_ROAMING);
 143
 144     if(!i_destinationHolder.HasArrived() && creature.IsStopped())
 145         creature.addUnitState(UNIT_STAT_ROAMING);
 146
 147     CreatureTraveller traveller(creature);
 148
 149     if( i_destinationHolder.UpdateTraveller(traveller, diff, false, true) )
 150     {
 151         if(i_nextMoveTime.Passed())
 152         {
 153             if (creature.canFly())
 154                 creature.AddMonsterMoveFlag(MONSTER_MOVE_FLY);
 155             else if(irand(0,RUNNING_CHANCE_RANDOMMV) > 0)
 156                 creature.AddMonsterMoveFlag(MONSTER_MOVE_WALK);
 157             else                                            // run with 1/RUNNING_CHANCE_RANDOMMV chance
 158                 creature.RemoveMonsterMoveFlag(MONSTER_MOVE_WALK);
 159
 160             _setRandomLocation(creature);
 161         }
 162         else if(creature.isPet() && creature.GetOwner() && !creature.IsWithinDist(creature.GetOwner(),PET_FOLLOW_DIST+2.5f))
 163         {
 164            creature.AddMonsterMoveFlag(MONSTER_MOVE_WALK);
 165            _setRandomLocation(creature);
 166         }
 167     }
 168     return true;
 169 }