src/game/TargetedMovementGenerator.cpp

   1 /*
   2  * Copyright (C) 2005-2013 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 "Player.h"
  24 #include "World.h"
  25 #include "movement/MoveSplineInit.h"
  26 #include "movement/MoveSpline.h"
  27
  28 //-----------------------------------------------//
  29 template<class T, typename D>
  30 void TargetedMovementGeneratorMedium<T, D>::_setTargetLocation(T& owner, bool updateDestination)
  31 {
  32     if (!i_target.isValid() || !i_target->IsInWorld())
  33         return;
  34
  35     if (owner.hasUnitState(UNIT_STAT_NOT_MOVE))
  36         return;
  37
  38     float x, y, z;
  39
  40     // i_path can be NULL in case this is the first call for this MMGen (via Update)
  41     // Can happen for example if no path was created on MMGen-Initialize because of the owner being stunned
  42     if (updateDestination || !i_path)
  43     {
  44         // prevent redundant micro-movement for pets, other followers.
  45         if (i_offset && i_target->IsWithinDistInMap(&owner, 2 * i_offset))
  46         {
  47             if (!owner.movespline->Finalized())
  48                 return;
  49
  50             owner.GetPosition(x, y, z);
  51         }
  52         else if (!i_offset)
  53         {
  54             // to nearest contact position
  55             i_target->GetContactPoint(&owner, x, y, z);
  56         }
  57         else
  58         {
  59             // to at i_offset distance from target and i_angle from target facing
  60             i_target->GetClosePoint(x, y, z, owner.GetObjectBoundingRadius(), i_offset, i_angle, &owner);
  61         }
  62     }
  63     else
  64     {
  65         // the destination has not changed, we just need to refresh the path (usually speed change)
  66         G3D::Vector3 end = i_path->getEndPosition();
  67         x = end.x;
  68         y = end.y;
  69         z = end.z;
  70     }
  71
  72     if (!i_path)
  73         i_path = new PathFinder(&owner);
  74
  75     // allow pets following their master to cheat while generating paths
  76     bool forceDest = (owner.GetTypeId() == TYPEID_UNIT && ((Creature*)&owner)->IsPet()
  77                       && owner.hasUnitState(UNIT_STAT_FOLLOW));
  78     i_path->calculate(x, y, z, forceDest);
  79     if (i_path->getPathType() & PATHFIND_NOPATH)
  80         return;
  81
  82     D::_addUnitStateMove(owner);
  83     i_targetReached = false;
  84     m_speedChanged = false;
  85
  86     Movement::MoveSplineInit init(owner);
  87     init.MovebyPath(i_path->getPath());
  88     init.SetWalk(((D*)this)->EnableWalking());
  89     init.Launch();
  90 }
  91
  92 template<class T, typename D>
  93 bool TargetedMovementGeneratorMedium<T, D>::Update(T& owner, const uint32& time_diff)
  94 {
  95     if (!i_target.isValid() || !i_target->IsInWorld())
  96         return false;
  97
  98     if (!owner.isAlive())
  99         return true;
 100
 101     if (owner.hasUnitState(UNIT_STAT_NOT_MOVE))
 102     {
 103         D::_clearUnitStateMove(owner);
 104         return true;
 105     }
 106
 107     // prevent movement while casting spells with cast time or channel time
 108     if (owner.IsNonMeleeSpellCasted(false, false,  true))
 109     {
 110         if (!owner.IsStopped())
 111             owner.StopMoving();
 112         return true;
 113     }
 114
 115     // prevent crash after creature killed pet
 116     if (static_cast<D*>(this)->_lostTarget(owner))
 117     {
 118         D::_clearUnitStateMove(owner);
 119         return true;
 120     }
 121
 122     bool targetMoved = false;
 123     i_recheckDistance.Update(time_diff);
 124     if (i_recheckDistance.Passed())
 125     {
 126         i_recheckDistance.Reset(100);
 127
 128         // More distance let have better performance, less distance let have more sensitive reaction at target move.
 129         float allowed_dist = owner.GetObjectBoundingRadius() + sWorld.getConfig(CONFIG_FLOAT_RATE_TARGET_POS_RECALCULATION_RANGE);
 130         G3D::Vector3 dest = owner.movespline->FinalDestination();
 131
 132         if (owner.GetTypeId() == TYPEID_UNIT && ((Creature*)&owner)->CanFly())
 133             targetMoved = !i_target->IsWithinDist3d(dest.x, dest.y, dest.z, allowed_dist);
 134         else
 135             targetMoved = !i_target->IsWithinDist2d(dest.x, dest.y, allowed_dist);
 136     }
 137
 138     if (m_speedChanged || targetMoved)
 139         _setTargetLocation(owner, targetMoved);
 140
 141     if (owner.movespline->Finalized())
 142     {
 143         if (i_angle == 0.f && !owner.HasInArc(0.01f, i_target.getTarget()))
 144             owner.SetInFront(i_target.getTarget());
 145
 146         if (!i_targetReached)
 147         {
 148             i_targetReached = true;
 149             static_cast<D*>(this)->_reachTarget(owner);
 150         }
 151     }
 152     return true;
 153 }
 154
 155 //-----------------------------------------------//
 156 template<class T>
 157 void ChaseMovementGenerator<T>::_reachTarget(T& owner)
 158 {
 159     if (owner.CanReachWithMeleeAttack(this->i_target.getTarget()))
 160         owner.Attack(this->i_target.getTarget(), true);
 161 }
 162
 163 template<>
 164 void ChaseMovementGenerator<Player>::Initialize(Player& owner)
 165 {
 166     owner.addUnitState(UNIT_STAT_CHASE | UNIT_STAT_CHASE_MOVE);
 167     _setTargetLocation(owner, true);
 168 }
 169
 170 template<>
 171 void ChaseMovementGenerator<Creature>::Initialize(Creature& owner)
 172 {
 173     owner.SetWalk(false, false);                            // Chase movement is running
 174     owner.addUnitState(UNIT_STAT_CHASE | UNIT_STAT_CHASE_MOVE);
 175     _setTargetLocation(owner, true);
 176 }
 177
 178 template<class T>
 179 void ChaseMovementGenerator<T>::Finalize(T& owner)
 180 {
 181     owner.clearUnitState(UNIT_STAT_CHASE | UNIT_STAT_CHASE_MOVE);
 182 }
 183
 184 template<class T>
 185 void ChaseMovementGenerator<T>::Interrupt(T& owner)
 186 {
 187     owner.clearUnitState(UNIT_STAT_CHASE | UNIT_STAT_CHASE_MOVE);
 188 }
 189
 190 template<class T>
 191 void ChaseMovementGenerator<T>::Reset(T& owner)
 192 {
 193     Initialize(owner);
 194 }
 195
 196 //-----------------------------------------------//
 197 template<>
 198 bool FollowMovementGenerator<Creature>::EnableWalking() const
 199 {
 200     return i_target.isValid() && i_target->IsWalking();
 201 }
 202
 203 template<>
 204 bool FollowMovementGenerator<Player>::EnableWalking() const
 205 {
 206     return false;
 207 }
 208
 209 template<>
 210 void FollowMovementGenerator<Player>::_updateSpeed(Player& /*u*/)
 211 {
 212     // nothing to do for Player
 213 }
 214
 215 template<>
 216 void FollowMovementGenerator<Creature>::_updateSpeed(Creature& u)
 217 {
 218     // pet only sync speed with owner
 219     if (!((Creature&)u).IsPet() || !i_target.isValid() || i_target->GetObjectGuid() != u.GetOwnerGuid())
 220         return;
 221
 222     u.UpdateSpeed(MOVE_RUN, true);
 223     u.UpdateSpeed(MOVE_WALK, true);
 224     u.UpdateSpeed(MOVE_SWIM, true);
 225 }
 226
 227 template<>
 228 void FollowMovementGenerator<Player>::Initialize(Player& owner)
 229 {
 230     owner.addUnitState(UNIT_STAT_FOLLOW | UNIT_STAT_FOLLOW_MOVE);
 231     _updateSpeed(owner);
 232     _setTargetLocation(owner, true);
 233 }
 234
 235 template<>
 236 void FollowMovementGenerator<Creature>::Initialize(Creature& owner)
 237 {
 238     owner.addUnitState(UNIT_STAT_FOLLOW | UNIT_STAT_FOLLOW_MOVE);
 239     _updateSpeed(owner);
 240     _setTargetLocation(owner, true);
 241 }
 242
 243 template<class T>
 244 void FollowMovementGenerator<T>::Finalize(T& owner)
 245 {
 246     owner.clearUnitState(UNIT_STAT_FOLLOW | UNIT_STAT_FOLLOW_MOVE);
 247     _updateSpeed(owner);
 248 }
 249
 250 template<class T>
 251 void FollowMovementGenerator<T>::Interrupt(T& owner)
 252 {
 253     owner.clearUnitState(UNIT_STAT_FOLLOW | UNIT_STAT_FOLLOW_MOVE);
 254     _updateSpeed(owner);
 255 }
 256
 257 template<class T>
 258 void FollowMovementGenerator<T>::Reset(T& owner)
 259 {
 260     Initialize(owner);
 261 }
 262
 263 //-----------------------------------------------//
 264 template void TargetedMovementGeneratorMedium<Player, ChaseMovementGenerator<Player> >::_setTargetLocation(Player&, bool);
 265 template void TargetedMovementGeneratorMedium<Player, FollowMovementGenerator<Player> >::_setTargetLocation(Player&, bool);
 266 template void TargetedMovementGeneratorMedium<Creature, ChaseMovementGenerator<Creature> >::_setTargetLocation(Creature&, bool);
 267 template void TargetedMovementGeneratorMedium<Creature, FollowMovementGenerator<Creature> >::_setTargetLocation(Creature&, bool);
 268 template bool TargetedMovementGeneratorMedium<Player, ChaseMovementGenerator<Player> >::Update(Player&, const uint32&);
 269 template bool TargetedMovementGeneratorMedium<Player, FollowMovementGenerator<Player> >::Update(Player&, const uint32&);
 270 template bool TargetedMovementGeneratorMedium<Creature, ChaseMovementGenerator<Creature> >::Update(Creature&, const uint32&);
 271 template bool TargetedMovementGeneratorMedium<Creature, FollowMovementGenerator<Creature> >::Update(Creature&, const uint32&);
 272
 273 template void ChaseMovementGenerator<Player>::_reachTarget(Player&);
 274 template void ChaseMovementGenerator<Creature>::_reachTarget(Creature&);
 275 template void ChaseMovementGenerator<Player>::Finalize(Player&);
 276 template void ChaseMovementGenerator<Creature>::Finalize(Creature&);
 277 template void ChaseMovementGenerator<Player>::Interrupt(Player&);
 278 template void ChaseMovementGenerator<Creature>::Interrupt(Creature&);
 279 template void ChaseMovementGenerator<Player>::Reset(Player&);
 280 template void ChaseMovementGenerator<Creature>::Reset(Creature&);
 281
 282 template void FollowMovementGenerator<Player>::Finalize(Player&);
 283 template void FollowMovementGenerator<Creature>::Finalize(Creature&);
 284 template void FollowMovementGenerator<Player>::Interrupt(Player&);
 285 template void FollowMovementGenerator<Creature>::Interrupt(Creature&);
 286 template void FollowMovementGenerator<Player>::Reset(Player&);
 287 template void FollowMovementGenerator<Creature>::Reset(Creature&);