src/game/TargetedMovementGenerator.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 "ByteBuffer.h"
  20 #include "TargetedMovementGenerator.h"
  21 #include "Errors.h"
  22 #include "Creature.h"
  23 #include "DestinationHolderImp.h"
  24 #include "World.h"
  25
  26 #define SMALL_ALPHA 0.05f
  27
  28 #include <cmath>
  29 /*
  30 struct StackCleaner
  31 {
  32     Creature &i_creature;
  33     StackCleaner(Creature &creature) : i_creature(creature) {}
  34     void Done(void) { i_creature.StopMoving(); }
  35     ~StackCleaner()
  36     {
  37         i_creature->Clear();
  38     }
  39 };
  40 */
  41
  42 template<class T>
  43 void
  44 TargetedMovementGenerator<T>::_setTargetLocation(T &owner)
  45 {
  46     if( !i_target.isValid() || !&owner )
  47         return;
  48
  49     if( owner.hasUnitState(UNIT_STAT_ROOT | UNIT_STAT_STUNNED | UNIT_STAT_DISTRACTED) )
  50         return;
  51
  52     // prevent redundant micro-movement for pets, other followers.
  53     if(i_offset && i_target->IsWithinDistInMap(&owner,2*i_offset))
  54         return;
  55
  56     float x, y, z;
  57     if(!i_offset)
  58     {
  59         // to nearest contact position
  60         i_target->GetContactPoint( &owner, x, y, z );
  61     }
  62     else
  63     {
  64         // to at i_offset distance from target and i_angle from target facing
  65         i_target->GetClosePoint(x,y,z,owner.GetObjectSize(),i_offset,i_angle);
  66     }
  67
  68     /*
  69         We MUST not check the distance difference and avoid setting the new location for smaller distances.
  70         By that we risk having far too many GetContactPoint() calls freezing the whole system.
  71         In TargetedMovementGenerator<T>::Update() we check the distance to the target and at
  72         some range we calculate a new position. The calculation takes some processor cycles due to vmaps.
  73         If the distance to the target it too large to ignore,
  74         but the distance to the new contact point is short enough to be ignored,
  75         we will calculate a new contact point each update loop, but will never move to it.
  76         The system will freeze.
  77         ralf
  78
  79         //We don't update Mob Movement, if the difference between New destination and last destination is < BothObjectSize
  80         float  bothObjectSize = i_target->GetObjectSize() + owner.GetObjectSize() + CONTACT_DISTANCE;
  81         if( i_destinationHolder.HasDestination() && i_destinationHolder.GetDestinationDiff(x,y,z) < bothObjectSize )
  82             return;
  83     */
  84     Traveller<T> traveller(owner);
  85     i_destinationHolder.SetDestination(traveller, x, y, z);
  86     owner.addUnitState(UNIT_STAT_CHASE);
  87     if (owner.GetTypeId() == TYPEID_UNIT && ((Creature*)&owner)->canFly())
  88         owner.AddUnitMovementFlag(MONSTER_MOVE_FLY);
  89 }
  90
  91 template<class T>
  92 void
  93 TargetedMovementGenerator<T>::Initialize(T &owner)
  94 {
  95     owner.RemoveUnitMovementFlag(MONSTER_MOVE_WALK);
  96
  97     if (owner.GetTypeId() == TYPEID_UNIT && ((Creature*)&owner)->canFly())
  98         owner.AddUnitMovementFlag(MONSTER_MOVE_FLY);
  99
 100     _setTargetLocation(owner);
 101 }
 102
 103 template<class T>
 104 void
 105 TargetedMovementGenerator<T>::Finalize(T &owner)
 106 {
 107     owner.clearUnitState(UNIT_STAT_CHASE);
 108 }
 109
 110 template<class T>
 111 void
 112 TargetedMovementGenerator<T>::Reset(T &owner)
 113 {
 114     Initialize(owner);
 115 }
 116
 117 template<class T>
 118 bool
 119 TargetedMovementGenerator<T>::Update(T &owner, const uint32 & time_diff)
 120 {
 121     if(!i_target.isValid())
 122         return false;
 123
 124     if( !&owner || !owner.isAlive())
 125         return true;
 126
 127     if( owner.hasUnitState(UNIT_STAT_ROOT | UNIT_STAT_STUNNED | UNIT_STAT_FLEEING | UNIT_STAT_DISTRACTED) )
 128         return true;
 129
 130     // prevent movement while casting spells with cast time or channel time
 131     if ( owner.IsNonMeleeSpellCasted(false, false,  true))
 132     {
 133         if (!owner.IsStopped())
 134             owner.StopMoving();
 135         return true;
 136     }
 137
 138     // prevent crash after creature killed pet
 139     if (!owner.hasUnitState(UNIT_STAT_FOLLOW) && owner.getVictim() != i_target.getTarget())
 140         return true;
 141
 142     Traveller<T> traveller(owner);
 143
 144     if( !i_destinationHolder.HasDestination() )
 145         _setTargetLocation(owner);
 146     if( owner.IsStopped() && !i_destinationHolder.HasArrived() )
 147     {
 148         owner.addUnitState(UNIT_STAT_CHASE);
 149         if (owner.GetTypeId() == TYPEID_UNIT && ((Creature*)&owner)->canFly())
 150             owner.AddUnitMovementFlag(MONSTER_MOVE_FLY);
 151
 152         i_destinationHolder.StartTravel(traveller);
 153         return true;
 154     }
 155
 156     if (i_destinationHolder.UpdateTraveller(traveller, time_diff, false))
 157     {
 158         // put targeted movement generators on a higher priority
 159         if (owner.GetObjectSize())
 160             i_destinationHolder.ResetUpdate(50);
 161
 162         float dist = i_target->GetObjectSize() + owner.GetObjectSize() + sWorld.getRate(RATE_TARGET_POS_RECALCULATION_RANGE);
 163
 164         //More distance let have better performance, less distance let have more sensitive reaction at target move.
 165
 166         // try to counter precision differences
 167         if( i_destinationHolder.GetDistance2dFromDestSq(*i_target.getTarget()) >= dist * dist)
 168         {
 169             owner.SetInFront(i_target.getTarget());         // Set new Angle For Map::
 170             _setTargetLocation(owner);                      //Calculate New Dest and Send data To Player
 171         }
 172         // Update the Angle of the target only for Map::, no need to send packet for player
 173         else if ( !i_angle && !owner.HasInArc( 0.01f, i_target.getTarget() ) )
 174             owner.SetInFront(i_target.getTarget());
 175
 176         if(( owner.IsStopped() && !i_destinationHolder.HasArrived() ) || i_recalculateTravel )
 177         {
 178             i_recalculateTravel = false;
 179             //Angle update will take place into owner.StopMoving()
 180             owner.SetInFront(i_target.getTarget());
 181
 182             owner.StopMoving();
 183             if(owner.canReachWithAttack(i_target.getTarget()) && !owner.hasUnitState(UNIT_STAT_FOLLOW))
 184                 owner.Attack(i_target.getTarget(),true);
 185         }
 186     }
 187     return true;
 188 }
 189
 190 template<class T>
 191 Unit*
 192 TargetedMovementGenerator<T>::GetTarget() const
 193 {
 194     return i_target.getTarget();
 195 }
 196
 197 template void TargetedMovementGenerator<Player>::_setTargetLocation(Player &);
 198 template void TargetedMovementGenerator<Creature>::_setTargetLocation(Creature &);
 199 template void TargetedMovementGenerator<Player>::Initialize(Player &);
 200 template void TargetedMovementGenerator<Creature>::Initialize(Creature &);
 201 template void TargetedMovementGenerator<Player>::Finalize(Player &);
 202 template void TargetedMovementGenerator<Creature>::Finalize(Creature &);
 203 template void TargetedMovementGenerator<Player>::Reset(Player &);
 204 template void TargetedMovementGenerator<Creature>::Reset(Creature &);
 205 template bool TargetedMovementGenerator<Player>::Update(Player &, const uint32 &);
 206 template bool TargetedMovementGenerator<Creature>::Update(Creature &, const uint32 &);
 207 template Unit* TargetedMovementGenerator<Player>::GetTarget() const;
 208 template Unit* TargetedMovementGenerator<Creature>::GetTarget() const;