TargetedMovementGenerator.h

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/*
* This file is part of Project SkyFire https://www.projectskyfire.org.
* See LICENSE.md file for Copyright information
*/
#ifndef SKYFIRE_TARGETEDMOVEMENTGENERATOR_H
#define SKYFIRE_TARGETEDMOVEMENTGENERATOR_H
 
#include "FollowerReference.h"
#include "MovementGenerator.h"
#include "PathGenerator.h"
#include "Timer.h"
#include "Unit.h"
 
class TargetedMovementGeneratorBase
{
public:
    TargetedMovementGeneratorBase(Unit* target) { i_target.link(target, this); }
    void stopFollowing() { }
protected:
    FollowerReference i_target;
};
 
template<class T, typename D>
class TargetedMovementGeneratorMedium : public MovementGeneratorMedium< T, D >, public TargetedMovementGeneratorBase
{
protected:
    TargetedMovementGeneratorMedium(Unit* target, float offset, float angle) :
        TargetedMovementGeneratorBase(target), i_path(NULL),
        i_recheckDistance(0), i_offset(offset), i_angle(angle),
        i_recalculateTravel(false), i_targetReached(false)
    {
    }
    ~TargetedMovementGeneratorMedium() { delete i_path; }
 
public:
    bool DoUpdate(T*, uint32);
    Unit* GetTarget() const { return i_target.getTarget(); }
 
    void unitSpeedChanged() { i_recalculateTravel = true; }
    bool IsReachable() const { return (i_path) ? (i_path->GetPathType() & PATHFIND_NORMAL) : true; }
protected:
    void _setTargetLocation(T* owner, bool updateDestination);
 
    PathGenerator* i_path;
    TimeTrackerSmall i_recheckDistance;
    float i_offset;
    float i_angle;
    bool i_recalculateTravel : 1;
    bool i_targetReached : 1;
};
 
template<class T>
class ChaseMovementGenerator : public TargetedMovementGeneratorMedium<T, ChaseMovementGenerator<T> >
{
public:
    ChaseMovementGenerator(Unit* target)
        : TargetedMovementGeneratorMedium<T, ChaseMovementGenerator<T> >(target) { }
    ChaseMovementGenerator(Unit* target, float offset, float angle)
        : TargetedMovementGeneratorMedium<T, ChaseMovementGenerator<T> >(target, offset, angle) { }
    ~ChaseMovementGenerator() { }
 
    MovementGeneratorType GetMovementGeneratorType() { return CHASE_MOTION_TYPE; }
 
    void DoInitialize(T*);
    void DoFinalize(T*);
    void DoReset(T*);
    void MovementInform(T*);
 
    static void _clearUnitStateMove(T* u) { u->ClearUnitState(UNIT_STATE_CHASE_MOVE); }
    static void _addUnitStateMove(T* u) { u->AddUnitState(UNIT_STATE_CHASE_MOVE); }
    bool EnableWalking() const { return false; }
    bool _lostTarget(T* u) const { return u->GetVictim() != this->GetTarget(); }
    void _reachTarget(T*);
};
 
template<class T>
class FollowMovementGenerator : public TargetedMovementGeneratorMedium<T, FollowMovementGenerator<T> >
{
public:
    FollowMovementGenerator(Unit* target)
        : TargetedMovementGeneratorMedium<T, FollowMovementGenerator<T> >(target) { }
    FollowMovementGenerator(Unit* target, float offset, float angle)
        : TargetedMovementGeneratorMedium<T, FollowMovementGenerator<T> >(target, offset, angle) { }
    ~FollowMovementGenerator() { }
 
    MovementGeneratorType GetMovementGeneratorType() { return FOLLOW_MOTION_TYPE; }
 
    void DoInitialize(T*);
    void DoFinalize(T*);
    void DoReset(T*);
    void MovementInform(T*);
 
    static void _clearUnitStateMove(T* u) { u->ClearUnitState(UNIT_STATE_FOLLOW_MOVE); }
    static void _addUnitStateMove(T* u) { u->AddUnitState(UNIT_STATE_FOLLOW_MOVE); }
    bool EnableWalking() const;
    bool _lostTarget(T*) const { return false; }
    void _reachTarget(T*) { }
private:
    void _updateSpeed(T* owner);
};
 
#endif