FleeingMovementGenerator.cpp

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/*
* This file is part of Project SkyFire https://www.projectskyfire.org.
* See LICENSE.md file for Copyright information
*/
 
#include "Creature.h"
#include "CreatureAI.h"
#include "FleeingMovementGenerator.h"
#include "MapManager.h"
#include "MoveSpline.h"
#include "MoveSplineInit.h"
#include "ObjectAccessor.h"
#include "PathGenerator.h"
#include "Player.h"
 
#define MIN_QUIET_DISTANCE 28.0f
#define MAX_QUIET_DISTANCE 43.0f
 
template<class T>
void FleeingMovementGenerator<T>::_setTargetLocation(T* owner)
{
    if (!owner)
        return;
 
    if (owner->HasUnitState(UNIT_STATE_ROOT | UNIT_STATE_STUNNED))
        return;
 
    owner->AddUnitState(UNIT_STATE_FLEEING_MOVE);
 
    float x, y, z;
    _getPoint(owner, x, y, z);
 
    PathGenerator path(owner);
    path.SetPathLengthLimit(30.0f);
    bool result = path.CalculatePath(x, y, z);
    if (!result || (path.GetPathType() & PATHFIND_NOPATH))
    {
        i_nextCheckTime.Reset(100);
        return;
    }
 
    Movement::MoveSplineInit init(owner);
    init.MovebyPath(path.GetPath());
    init.SetWalk(false);
    int32 traveltime = init.Launch();
    i_nextCheckTime.Reset(traveltime + (std::rand() % 1500 + 800));
}
 
template<class T>
void FleeingMovementGenerator<T>::_getPoint(T* owner, float& x, float& y, float& z)
{
    float dist_from_caster, angle_to_caster;
    if (Unit* fright = ObjectAccessor::GetUnit(*owner, i_frightGUID))
    {
        dist_from_caster = fright->GetDistance(owner);
        if (dist_from_caster > 0.2f)
            angle_to_caster = fright->GetAngle(owner);
        else
            angle_to_caster = frand(0, 2 * static_cast<float>(M_PI));
    }
    else
    {
        dist_from_caster = 0.0f;
        angle_to_caster = frand(0, 2 * static_cast<float>(M_PI));
    }
 
    float dist, angle;
    if (dist_from_caster < MIN_QUIET_DISTANCE)
    {
        dist = frand(0.4f, 1.3f) * (MIN_QUIET_DISTANCE - dist_from_caster);
        angle = angle_to_caster + frand(-static_cast<float>(M_PI) / 8, static_cast<float>(M_PI) / 8);
    }
    else if (dist_from_caster > MAX_QUIET_DISTANCE)
    {
        dist = frand(0.4f, 1.0f) * (MAX_QUIET_DISTANCE - MIN_QUIET_DISTANCE);
        angle = -angle_to_caster + frand(-static_cast<float>(M_PI) / 4, static_cast<float>(M_PI) / 4);
    }
    else    // we are inside quiet range
    {
        dist = frand(0.6f, 1.2f) * (MAX_QUIET_DISTANCE - MIN_QUIET_DISTANCE);
        angle = frand(0, 2 * static_cast<float>(M_PI));
    }
 
    Position pos;
    owner->GetFirstCollisionPosition(pos, dist, angle);
    x = pos.m_positionX;
    y = pos.m_positionY;
    z = pos.m_positionZ;
}
 
template<class T>
void FleeingMovementGenerator<T>::DoInitialize(T* owner)
{
    if (!owner)
        return;
 
    owner->SetFlag(UNIT_FIELD_FLAGS, UNIT_FLAG_FLEEING);
    owner->AddUnitState(UNIT_STATE_FLEEING | UNIT_STATE_FLEEING_MOVE);
    _setTargetLocation(owner);
}
 
template<>
void FleeingMovementGenerator<Player>::DoFinalize(Player* owner)
{
    owner->RemoveFlag(UNIT_FIELD_FLAGS, UNIT_FLAG_FLEEING);
    owner->ClearUnitState(UNIT_STATE_FLEEING | UNIT_STATE_FLEEING_MOVE);
    owner->StopMoving();
}
 
template<>
void FleeingMovementGenerator<Creature>::DoFinalize(Creature* owner)
{
    owner->RemoveFlag(UNIT_FIELD_FLAGS, UNIT_FLAG_FLEEING);
    owner->ClearUnitState(UNIT_STATE_FLEEING | UNIT_STATE_FLEEING_MOVE);
    if (owner->GetVictim())
        owner->SetTarget(owner->GetVictim()->GetGUID());
}
 
template<class T>
void FleeingMovementGenerator<T>::DoReset(T* owner)
{
    DoInitialize(owner);
}
 
template<class T>
bool FleeingMovementGenerator<T>::DoUpdate(T* owner, uint32 time_diff)
{
    if (!owner || !owner->IsAlive())
        return false;
 
    if (owner->HasUnitState(UNIT_STATE_ROOT | UNIT_STATE_STUNNED))
    {
        owner->ClearUnitState(UNIT_STATE_FLEEING_MOVE);
        return true;
    }
 
    i_nextCheckTime.Update(time_diff);
    if (i_nextCheckTime.Passed() && owner->movespline->Finalized())
        _setTargetLocation(owner);
 
    return true;
}
 
template void FleeingMovementGenerator<Player>::DoInitialize(Player*);
template void FleeingMovementGenerator<Creature>::DoInitialize(Creature*);
template void FleeingMovementGenerator<Player>::_getPoint(Player*, float&, float&, float&);
template void FleeingMovementGenerator<Creature>::_getPoint(Creature*, float&, float&, float&);
template void FleeingMovementGenerator<Player>::_setTargetLocation(Player*);
template void FleeingMovementGenerator<Creature>::_setTargetLocation(Creature*);
template void FleeingMovementGenerator<Player>::DoReset(Player*);
template void FleeingMovementGenerator<Creature>::DoReset(Creature*);
template bool FleeingMovementGenerator<Player>::DoUpdate(Player*, uint32);
template bool FleeingMovementGenerator<Creature>::DoUpdate(Creature*, uint32);
 
void TimedFleeingMovementGenerator::Finalize(Unit* owner)
{
    owner->RemoveFlag(UNIT_FIELD_FLAGS, UNIT_FLAG_FLEEING);
    owner->ClearUnitState(UNIT_STATE_FLEEING | UNIT_STATE_FLEEING_MOVE);
    if (Unit* victim = owner->GetVictim())
    {
        if (owner->IsAlive())
        {
            owner->AttackStop();
            owner->ToCreature()->AI()->AttackStart(victim);
        }
    }
}
 
bool TimedFleeingMovementGenerator::Update(Unit* owner, uint32 time_diff)
{
    if (!owner->IsAlive())
        return false;
 
    if (owner->HasUnitState(UNIT_STATE_ROOT | UNIT_STATE_STUNNED))
    {
        owner->ClearUnitState(UNIT_STATE_FLEEING_MOVE);
        return true;
    }
 
    i_totalFleeTime.Update(time_diff);
    if (i_totalFleeTime.Passed())
        return false;
 
    // This calls grant-parent Update method hiden by FleeingMovementGenerator::Update(Creature &, uint32) version
    // This is done instead of casting Unit& to Creature& and call parent method, then we can use Unit directly
    return MovementGeneratorMedium< Creature, FleeingMovementGenerator<Creature> >::Update(owner, time_diff);
}