FleeingMovementGenerator.cpp

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/*
 * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */
 
#include "FleeingMovementGenerator.h"
#include "Creature.h"
#include "CreatureAI.h"
#include "MoveSpline.h"
#include "MoveSplineInit.h"
#include "ObjectAccessor.h"
#include "PathGenerator.h"
 
#define MIN_QUIET_DISTANCE 28.0f
#define MAX_QUIET_DISTANCE 43.0f
 
FleeingMovementGenerator::FleeingMovementGenerator(ObjectGuid fleeTargetGUID) : _fleeTargetGUID(fleeTargetGUID), _timer(0)
{
 Mode = MOTION_MODE_DEFAULT;
 Priority = MOTION_PRIORITY_HIGHEST;
 Flags = MOVEMENTGENERATOR_FLAG_INITIALIZATION_PENDING;
 BaseUnitState = UNIT_STATE_FLEEING;
}
 
MovementGeneratorType FleeingMovementGenerator::GetMovementGeneratorType() const
{
 return FLEEING_MOTION_TYPE;
}
 
void FleeingMovementGenerator::Initialize(Unit* owner)
{
 RemoveFlag(MOVEMENTGENERATOR_FLAG_INITIALIZATION_PENDING | MOVEMENTGENERATOR_FLAG_TRANSITORY | MOVEMENTGENERATOR_FLAG_DEACTIVATED);
 AddFlag(MOVEMENTGENERATOR_FLAG_INITIALIZED);
 
 if (!owner || !owner->IsAlive())
 return;
 
 _path = nullptr;
 SetTargetLocation(owner);
}
 
void FleeingMovementGenerator::Reset(Unit* owner)
{
 RemoveFlag(MOVEMENTGENERATOR_FLAG_TRANSITORY | MOVEMENTGENERATOR_FLAG_DEACTIVATED);
 
 Initialize(owner);
}
 
bool FleeingMovementGenerator::Update(Unit* owner, uint32 diff)
{
 if (!owner || !owner->IsAlive())
 return false;
 
 if (owner->HasUnitState(UNIT_STATE_NOT_MOVE) || owner->IsMovementPreventedByCasting())
 {
 AddFlag(MOVEMENTGENERATOR_FLAG_INTERRUPTED);
 owner->StopMoving();
 _path = nullptr;
 return true;
 }
 else
 RemoveFlag(MOVEMENTGENERATOR_FLAG_INTERRUPTED);
 
 _timer.Update(diff);
 if ((HasFlag(MOVEMENTGENERATOR_FLAG_SPEED_UPDATE_PENDING) && !owner->movespline->Finalized()) || (_timer.Passed() && owner->movespline->Finalized()))
 {
 RemoveFlag(MOVEMENTGENERATOR_FLAG_TRANSITORY);
 SetTargetLocation(owner);
 }
 
 return true;
}
 
void FleeingMovementGenerator::Deactivate(Unit* owner)
{
 AddFlag(MOVEMENTGENERATOR_FLAG_DEACTIVATED);
 owner->ClearUnitState(UNIT_STATE_FLEEING_MOVE);
}
 
void FleeingMovementGenerator::Finalize(Unit* owner, bool active, bool /*movementInform*/)
{
 AddFlag(MOVEMENTGENERATOR_FLAG_FINALIZED);
 
 if (active)
 {
 owner->ClearUnitState(UNIT_STATE_FLEEING_MOVE);
 
 if (owner->IsCreature())
 {
 if (Unit const* victim = owner->GetVictim())
 owner->SetTarget(victim->GetGUID());
 }
 else if (owner->IsPlayer())
 owner->StopMoving();
 }
}
 
void FleeingMovementGenerator::SetTargetLocation(Unit* owner)
{
 if (!owner || !owner->IsAlive())
 return;
 
 if (owner->HasUnitState(UNIT_STATE_NOT_MOVE) || owner->IsMovementPreventedByCasting())
 {
 AddFlag(MOVEMENTGENERATOR_FLAG_INTERRUPTED);
 owner->StopMoving();
 _path = nullptr;
 return;
 }
 
 Position destination = owner->GetPosition();
 GetPoint(owner, destination);
 
 // Add LOS check for target point
 if (!owner->IsWithinLOS(destination.GetPositionX(), destination.GetPositionY(), destination.GetPositionZ()))
 {
 _timer.Reset(200);
 return;
 }
 
 if (!_path)
 {
 _path = std::make_unique<PathGenerator>(owner);
 _path->SetPathLengthLimit(30.0f);
 }
 
 bool result = _path->CalculatePath(destination.GetPositionX(), destination.GetPositionY(), destination.GetPositionZ());
 if (!result || (_path->GetPathType() & PATHFIND_NOPATH)
 || (_path->GetPathType() & PATHFIND_SHORTCUT)
 || (_path->GetPathType() & PATHFIND_FARFROMPOLY))
 {
 _timer.Reset(100);
 return;
 }
 
 owner->AddUnitState(UNIT_STATE_FLEEING_MOVE);
 
 Movement::MoveSplineInit init(owner);
 init.MovebyPath(_path->GetPath());
 init.SetWalk(false);
 int32 traveltime = init.Launch();
 _timer.Reset(traveltime + urand(800, 1500));
}
 
void FleeingMovementGenerator::GetPoint(Unit* owner, Position& position) const
{
 float casterDistance, casterAngle;
 if (Unit* fleeTarget = ObjectAccessor::GetUnit(*owner, _fleeTargetGUID))
 {
 casterDistance = fleeTarget->GetDistance(owner);
 if (casterDistance > 0.2f)
 casterAngle = fleeTarget->GetAbsoluteAngle(owner);
 else
 casterAngle = frand(0.0f, 2.0f * float(M_PI));
 }
 else
 {
 casterDistance = 0.0f;
 casterAngle = frand(0.0f, 2.0f * float(M_PI));
 }
 
 float distance, angle;
 if (casterDistance < MIN_QUIET_DISTANCE)
 {
 distance = frand(0.4f, 1.3f) * (MIN_QUIET_DISTANCE - casterDistance);
 angle = casterAngle + frand(-float(M_PI) / 8.0f, float(M_PI) / 8.0f);
 }
 else if (casterDistance > MAX_QUIET_DISTANCE)
 {
 distance = frand(0.4f, 1.0f) * (MAX_QUIET_DISTANCE - MIN_QUIET_DISTANCE);
 angle = -casterAngle + frand(-float(M_PI) / 4.0f, float(M_PI) / 4.0f);
 }
 else // we are inside quiet range
 {
 distance = frand(0.6f, 1.2f) * (MAX_QUIET_DISTANCE - MIN_QUIET_DISTANCE);
 angle = frand(0.0f, 2.0f * float(M_PI));
 }
 
 owner->MovePositionToFirstCollision(position, distance, angle);
}
 
//---- TimedFleeingMovementGenerator
 
bool TimedFleeingMovementGenerator::Update(Unit* owner, uint32 diff)
{
 if (!owner || !owner->IsAlive())
 return false;
 
 _totalFleeTime.Update(diff);
 if (_totalFleeTime.Passed())
 return false;
 
 return FleeingMovementGenerator::Update(owner, diff);
}
 
void TimedFleeingMovementGenerator::Finalize(Unit* owner, bool active, bool movementInform)
{
 AddFlag(MOVEMENTGENERATOR_FLAG_FINALIZED);
 if (!active)
 return;
 
 owner->StopMoving();
 if (owner->IsCreature() && owner->IsAlive())
 {
 if (Unit* victim = owner->GetVictim())
 {
 owner->AttackStop();
 owner->GetAI()->AttackStart(victim);
 }
 }
 
 if (movementInform)
 {
 Creature* ownerCreature = owner->ToCreature();
 if (CreatureAI* AI = ownerCreature ? ownerCreature->AI() : nullptr)
 AI->MovementInform(TIMED_FLEEING_MOTION_TYPE, 0);
 }
}
 
MovementGeneratorType TimedFleeingMovementGenerator::GetMovementGeneratorType() const
{
 return TIMED_FLEEING_MOTION_TYPE;
}