fix(Core/Movement): add creature formation movement generator (#25030)

Co-authored-by: Shauren <shauren.trinity@gmail.com>
Co-authored-by: Rocco Silipo <108557877+Rorschach91@users.noreply.github.com>

src/server/game/Entities/Creature/Creature.cpp

@@ -22,6 +22,7 @@
 #include "CreatureAI.h"
 #include "CreatureAISelector.h"
 #include "CreatureGroups.h"
+#include "MoveSpline.h"
 #include "DatabaseEnv.h"
 #include "Formulas.h"
 #include "GameEventMgr.h"
@@ -1093,8 +1094,7 @@ bool Creature::AIM_Initialize(CreatureAI* ai)
 
     UnitAI* oldAI = i_AI;
 
-    // Xinef: called in add to world
-    //Motion_Initialize();
+    Motion_Initialize();
 
     i_AI = ai ? ai : FactorySelector::SelectAI(this);
     delete oldAI;
@@ -1117,7 +1117,19 @@ void Creature::Motion_Initialize()
         GetMotionMaster()->Initialize();
     }
     else if (m_formation->IsFormed())
+    {
+        // If the leader is already moving, start following immediately
+        // instead of waiting for the next waypoint signal.
+        if (Creature* leader = m_formation->GetLeader())
+        {
+            if (leader->IsAlive() && !leader->movespline->Finalized())
+            {
+                m_formation->LeaderStartedMoving();
+                return;
+            }
+        }
         GetMotionMaster()->MoveIdle(); //wait the order of leader
+    }
     else
         GetMotionMaster()->Initialize();
 }

src/server/game/Entities/Creature/CreatureGroups.cpp

@@ -186,6 +186,7 @@ void CreatureGroup::RemoveMember(Creature* member)
 {
     if (m_leader == member)
     {
+        RemoveFormationMovement();
         m_leader = nullptr;
     }
 
@@ -333,7 +334,7 @@ void CreatureGroup::FormationReset(bool dismiss, bool initMotionMaster)
             if (initMotionMaster)
             {
                 if (dismiss)
-                    member->GetMotionMaster()->Initialize();
+                    member->GetMotionMaster()->MovementExpiredOnSlot(MOTION_SLOT_IDLE, false);
                 else
                     member->GetMotionMaster()->MoveIdle();
 
@@ -344,16 +345,11 @@ void CreatureGroup::FormationReset(bool dismiss, bool initMotionMaster)
     m_Formed = !dismiss;
 }
 
-void CreatureGroup::LeaderMoveTo(float x, float y, float z, uint32 move_type)
+void CreatureGroup::LeaderStartedMoving()
 {
-    //! To do: This should probably get its own movement generator or use WaypointMovementGenerator.
-    //! If the leader's path is known, member's path can be plotted as well using formation offsets.
     if (!m_leader)
         return;
 
-    float pathDist = m_leader->GetExactDist(x, y, z);
-    float pathAngle = std::atan2(m_leader->GetPositionY() - y, m_leader->GetPositionX() - x);
-
     for (auto const& itr : m_members)
     {
         Creature* member = itr.first;
@@ -361,59 +357,39 @@ void CreatureGroup::LeaderMoveTo(float x, float y, float z, uint32 move_type)
         if (member == m_leader || !member->IsAlive() || member->GetVictim() || !pFormationInfo.HasGroupFlag(std::underlying_type_t<GroupAIFlags>(GroupAIFlags::GROUP_AI_FLAG_FOLLOW_LEADER)))
             continue;
 
-        // If member is stunned / rooted etc don't allow to move him
-        // Or if charmed/controlled
         if (member->HasUnitState(UNIT_STATE_NOT_MOVE) || member->isPossessed() || member->HasUnitFlag(UNIT_FLAG_PLAYER_CONTROLLED))
             continue;
 
-        // Xinef: this should be automatized, if turn angle is greater than PI/2 (90<39>) we should swap formation angle
-        float followAngle = pFormationInfo.follow_angle;
-        if (static_cast<float>(M_PI) - std::fabs(std::fabs(m_leader->GetOrientation() - pathAngle) - static_cast<float>(M_PI)) > static_cast<float>(M_PI)* 0.5f)
-        {
-            // pussywizard: in both cases should be 2*M_PI - follow_angle
-            // pussywizard: also, GetCurrentWaypointID() returns 0..n-1, while point_1 must be > 0, so +1
-            // pussywizard: db table waypoint_data shouldn't have point id 0 and shouldn't have any gaps for this to work!
-            // if (m_leader->GetCurrentWaypointID()+1 == pFormationInfo->point_1 || m_leader->GetCurrentWaypointID()+1 == itr->second->point_2)
-            followAngle = Position::NormalizeOrientation(pFormationInfo.follow_angle + static_cast<float>(M_PI)); //(2 * M_PI) - itr->second->follow_angle;
-        }
-
+        float const followAngle = pFormationInfo.follow_angle;
         float const followDist = pFormationInfo.follow_dist;
 
-        float dx = x + std::cos(followAngle + pathAngle) * followDist;
-        float dy = y + std::sin(followAngle + pathAngle) * followDist;
-        float dz = z;
+        if (!member->HasUnitState(UNIT_STATE_FOLLOW_MOVE))
+            member->GetMotionMaster()->MoveFormation(m_leader, followDist, followAngle, pFormationInfo.point_1, pFormationInfo.point_2);
+    }
+}
 
-        Acore::NormalizeMapCoord(dx);
-        Acore::NormalizeMapCoord(dy);
-        if (move_type < 2)
-            member->UpdateGroundPositionZ(dx, dy, dz);
+bool CreatureGroup::CanLeaderStartMoving() const
+{
+    for (auto const& itr : m_members)
+    {
+        if (itr.first && itr.first != m_leader && itr.first->IsAlive())
+            if (itr.first->IsEngaged() || itr.first->IsInEvadeMode())
+                return false;
+    }
 
-        // pussywizard: setting the same movementflags is not enough, spline decides whether leader walks/runs, so spline param is now passed as "run" parameter to this function
-        member->SetUnitMovementFlags(m_leader->GetUnitMovementFlags());
-        switch (move_type)
-        {
-        case WAYPOINT_MOVE_TYPE_WALK:
-            member->AddUnitMovementFlag(MOVEMENTFLAG_WALKING);
-            break;
-        case WAYPOINT_MOVE_TYPE_RUN:
-            member->RemoveUnitMovementFlag(MOVEMENTFLAG_WALKING);
-            break;
-        case WAYPOINT_MOVE_TYPE_LAND:
-            member->AddUnitMovementFlag(MOVEMENTFLAG_DISABLE_GRAVITY);
-            break;
-        }
+    return true;
+}
 
-        // xinef: if we move members to position without taking care of sizes, we should compare distance without sizes
-        // xinef: change members speed basing on distance - if too far speed up, if too close slow down
-        UnitMoveType const mtype = Movement::SelectSpeedType(member->GetUnitMovementFlags());
-        float const speedRate = m_leader->GetSpeedRate(mtype) * member->GetExactDist(dx, dy, dz) / pathDist;
+void CreatureGroup::RemoveFormationMovement()
+{
+    for (auto const& itr : m_members)
+    {
+        Creature* member = itr.first;
+        if (!member || member == m_leader)
+            continue;
 
-        if (speedRate > 0.01f) // don't move if speed rate is too low
-        {
-            member->SetSpeedRate(mtype, speedRate);
-            member->GetMotionMaster()->MovePoint(0, dx, dy, dz);
-            member->SetHomePosition(dx, dy, dz, pathAngle);
-        }
+        if (member->GetMotionMaster()->GetMotionSlotType(MOTION_SLOT_IDLE) == FORMATION_MOTION_TYPE)
+            member->GetMotionMaster()->MovementExpiredOnSlot(MOTION_SLOT_IDLE, false);
     }
 }
 

src/server/game/Entities/Creature/CreatureGroups.h

@@ -108,7 +108,9 @@ public:
     void RemoveMember(Creature* member);
     void FormationReset(bool dismiss, bool initMotionMaster);
 
-    void LeaderMoveTo(float x, float y, float z, uint32 move_type);
+    void LeaderStartedMoving();
+    [[nodiscard]] bool CanLeaderStartMoving() const;
+    void RemoveFormationMovement();
     void MemberEngagingTarget(Creature* member, Unit* target);
     Unit* GetNewTargetForMember(Creature* member);
     void MemberEvaded(Creature* member);

src/server/game/Entities/Unit/Unit.cpp

@@ -44,6 +44,7 @@
 #include "MoveSpline.h"
 #include "MoveSplineInit.h"
 #include "MovementGenerator.h"
+#include "AbstractFollower.h"
 #include "ObjectAccessor.h"
 #include "ObjectMgr.h"
 #include "OutdoorPvP.h"
@@ -5528,6 +5529,16 @@ void Unit::RemoveAreaAurasDueToLeaveWorld()
     }
 }
 
+void Unit::RemoveAllFollowers()
+{
+    while (auto* ref = m_FollowingRefMgr.getFirst())
+    {
+        auto* source = ref->GetSource();
+        ref->delink();
+        source->SetTarget(nullptr);
+    }
+}
+
 void Unit::RemoveAllAuras()
 {
     // this may be a dead loop if some events on aura remove will continiously apply aura on remove
@@ -12700,6 +12711,8 @@ void Unit::RemoveFromWorld()
 
         RemoveAreaAurasDueToLeaveWorld();
 
+        RemoveAllFollowers();
+
         if (GetCharmerGUID())
         {
             LOG_FATAL("entities.unit", "Unit {} has charmer guid when removed from world", GetEntry());

src/server/game/Entities/Unit/Unit.h

@@ -1881,9 +1881,10 @@ public:
     [[nodiscard]] bool IsInDisallowedMountForm() const;
 
     // Followers
-    void addFollower(FollowerReference* pRef) { m_FollowingRefMgr.insertFirst(pRef); }
-    void removeFollower(FollowerReference* /*pRef*/) { /* nothing to do yet */ }
+    void AddFollower(FollowerReference* ref) { m_FollowingRefMgr.insertFirst(ref); }
     [[nodiscard]] virtual float GetFollowAngle() const { return static_cast<float>(M_PI / 2); }
+    void RemoveFollower(FollowerReference* /*ref*/ ) { /* nothing to do yet */ }
+    void RemoveAllFollowers();
 
     // Pets, guardians, minions...
     [[nodiscard]] Guardian* GetGuardianPet() const;

src/server/game/Movement/AbstractFollower.cpp

@@ -0,0 +1,28 @@
+/*
+ * This file is part of the AzerothCore 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 "AbstractFollower.h"
+#include "Unit.h"
+
+void AbstractFollower::SetTarget(Unit* unit)
+{
+    if (unit == GetTarget())
+        return;
+
+    i_target.link(unit, this);
+    _target = i_target.getTarget();
+}

src/server/game/Movement/AbstractFollower.h

@@ -0,0 +1,43 @@
+/*
+ * This file is part of the AzerothCore 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/>.
+ */
+
+#ifndef ACORE_ABSTRACTFOLLOWER_H
+#define ACORE_ABSTRACTFOLLOWER_H
+
+#include "FollowerReference.h"
+
+class Unit;
+
+class AbstractFollower
+{
+public:
+    explicit AbstractFollower(Unit* target = nullptr) { SetTarget(target); }
+    virtual ~AbstractFollower() { SetTarget(nullptr); }
+
+    void SetTarget(Unit* unit);
+    Unit* GetTarget() const { return _target; }
+    bool IsTargetValid() const { return i_target.isValid(); }
+
+    virtual void stopFollowing() { }
+
+    Unit* _target = nullptr;
+
+protected:
+    FollowerReference i_target;
+};
+
+#endif

src/server/game/Movement/FollowerRefMgr.h

@@ -21,9 +21,9 @@
 #include "RefMgr.h"
 
 class Unit;
-class TargetedMovementGeneratorBase;
+class AbstractFollower;
 
-class FollowerRefMgr : public RefMgr<Unit, TargetedMovementGeneratorBase>
+class FollowerRefMgr : public RefMgr<Unit, AbstractFollower>
 {
 };
 #endif

src/server/game/Movement/FollowerReference.cpp

@@ -16,17 +16,17 @@
  */
 
 #include "FollowerReference.h"
-#include "TargetedMovementGenerator.h"
+#include "AbstractFollower.h"
 #include "Unit.h"
 
 void FollowerReference::targetObjectBuildLink()
 {
-    getTarget()->addFollower(this);
+    getTarget()->AddFollower(this);
 }
 
 void FollowerReference::targetObjectDestroyLink()
 {
-    getTarget()->removeFollower(this);
+    getTarget()->RemoveFollower(this);
 }
 
 void FollowerReference::sourceObjectDestroyLink()

src/server/game/Movement/FollowerReference.h

@@ -20,10 +20,10 @@
 
 #include "Reference.h"
 
-class TargetedMovementGeneratorBase;
+class AbstractFollower;
 class Unit;
 
-class FollowerReference : public Reference<Unit, TargetedMovementGeneratorBase>
+class FollowerReference : public Reference<Unit, AbstractFollower>
 {
 protected:
     void targetObjectBuildLink() override;

src/server/game/Movement/MotionMaster.cpp

@@ -21,6 +21,7 @@
 #include "CreatureAISelector.h"
 #include "EscortMovementGenerator.h"
 #include "FleeingMovementGenerator.h"
+#include "FormationMovementGenerator.h"
 #include "GameTime.h"
 #include "HomeMovementGenerator.h"
 #include "IdleMovementGenerator.h"
@@ -466,6 +467,17 @@ void MotionMaster::MoveFollow(Unit* target, float dist, float angle, MovementSlo
     }
 }
 
+void MotionMaster::MoveFormation(Unit* leader, float dist, float angle, uint32 point1, uint32 point2)
+{
+    if (!leader || leader == _owner || _owner->HasUnitFlag(UNIT_FLAG_DISABLE_MOVE))
+        return;
+
+    if (!_owner->IsCreature())
+        return;
+
+    Mutate(new FormationMovementGenerator(leader, dist, angle, point1, point2), MOTION_SLOT_IDLE);
+}
+
 /**
  * @brief The unit will move to a specific point. Doesn't work with UNIT_FLAG_DISABLE_MOVE
  *

src/server/game/Movement/MotionMaster.h

@@ -55,7 +55,8 @@ enum MovementGeneratorType
     ROTATE_MOTION_TYPE    = 15,
     EFFECT_MOTION_TYPE    = 16,
     ESCORT_MOTION_TYPE    = 17,                             // xinef: EscortMovementGenerator.h
-    NULL_MOTION_TYPE      = 18
+    FORMATION_MOTION_TYPE = 18,                             // FormationMovementGenerator.h
+    NULL_MOTION_TYPE      = 19
 };
 
 enum MovementSlot
@@ -227,6 +228,7 @@ public:
     void MoveTargetedHome(bool walk = false);
     void MoveRandom(float wanderDistance = 0.0f);
     void MoveFollow(Unit* target, float dist, float angle, MovementSlot slot = MOTION_SLOT_ACTIVE, bool inheritWalkState = true, bool inheritSpeed = true);
+    void MoveFormation(Unit* leader, float dist, float angle, uint32 point1, uint32 point2);
     void MoveChase(Unit* target, std::optional<ChaseRange> dist = {}, std::optional<ChaseAngle> angle = {});
     void MoveChase(Unit* target, float dist, float angle) { MoveChase(target, ChaseRange(dist), ChaseAngle(angle)); }
     void MoveChase(Unit* target, float dist) { MoveChase(target, ChaseRange(dist)); }

src/server/game/Movement/MovementGenerators/FormationMovementGenerator.cpp

@@ -0,0 +1,173 @@
+/*
+ * This file is part of the AzerothCore 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 "FormationMovementGenerator.h"
+#include "Creature.h"
+#include "CreatureAI.h"
+#include "CreatureGroups.h"
+#include "MoveSpline.h"
+#include "MoveSplineInit.h"
+
+FormationMovementGenerator::FormationMovementGenerator(Unit* leader, float range, float angle, uint32 point1, uint32 point2)
+    : AbstractFollower(leader), _range(range), _angle(angle), _point1(point1), _point2(point2), _lastLeaderSplineID(0),
+    _hasPredictedDestination(false), _isMoving(false), _nextMoveTimer(0)
+{
+}
+
+void FormationMovementGenerator::DoInitialize(Creature* owner)
+{
+    if (owner->HasUnitState(UNIT_STATE_NOT_MOVE) || owner->IsMovementPreventedByCasting())
+    {
+        owner->StopMoving();
+        return;
+    }
+
+    _nextMoveTimer.Reset(0);
+}
+
+void FormationMovementGenerator::DoFinalize(Creature* owner)
+{
+    owner->ClearUnitState(UNIT_STATE_FOLLOW_MOVE);
+}
+
+void FormationMovementGenerator::DoReset(Creature* owner)
+{
+    DoInitialize(owner);
+}
+
+bool FormationMovementGenerator::DoUpdate(Creature* owner, uint32 diff)
+{
+    Unit* target = GetTarget();
+    if (!owner || !target)
+        return false;
+
+    if (owner->HasUnitState(UNIT_STATE_NOT_MOVE) || owner->IsMovementPreventedByCasting())
+    {
+        owner->StopMoving();
+        _nextMoveTimer.Reset(0);
+        _hasPredictedDestination = false;
+        _isMoving = false;
+        return true;
+    }
+
+    if (target->movespline->Finalized() && target->movespline->GetId() == _lastLeaderSplineID && _hasPredictedDestination)
+    {
+        owner->StopMoving();
+        _nextMoveTimer.Reset(0);
+        _hasPredictedDestination = false;
+        _isMoving = false;
+        return true;
+    }
+
+    if (!owner->movespline->Finalized())
+        owner->SetHomePosition(owner->GetPosition());
+
+    if (!target->movespline->Finalized() && target->movespline->GetId() != _lastLeaderSplineID)
+    {
+        if (_point1 && target->IsCreature())
+        {
+            if (CreatureGroup* formation = target->ToCreature()->GetFormation())
+            {
+                if (Creature* leader = formation->GetLeader())
+                {
+                    uint32 currentWaypoint = leader->GetCurrentWaypointID() + 1;
+                    if (currentWaypoint == _point1 || currentWaypoint == _point2)
+                        _angle = Position::NormalizeOrientation(float(2 * M_PI) - _angle);
+                }
+            }
+        }
+
+        LaunchMovement(owner, target);
+        _lastLeaderSplineID = target->movespline->GetId();
+        return true;
+    }
+
+    _nextMoveTimer.Update(diff);
+    if (_nextMoveTimer.Passed())
+    {
+        _nextMoveTimer.Reset(FORMATION_MOVEMENT_INTERVAL);
+
+        if (_lastLeaderPosition != target->GetPosition())
+        {
+            LaunchMovement(owner, target);
+            return true;
+        }
+    }
+
+    if (_isMoving && owner->movespline->Finalized())
+    {
+        _isMoving = false;
+        owner->SetFacingTo(target->GetOrientation());
+        MovementInform(owner);
+    }
+
+    return true;
+}
+
+void FormationMovementGenerator::LaunchMovement(Creature* owner, Unit* target)
+{
+    float relativeAngle = 0.0f;
+
+    if (!target->movespline->Finalized())
+    {
+        G3D::Vector3 const leaderDestination = target->movespline->CurrentDestination();
+        relativeAngle = target->GetRelativeAngle(leaderDestination.x, leaderDestination.y);
+    }
+
+    Position dest = target->GetPosition();
+    float velocity = 0.0f;
+
+    if (!target->movespline->Finalized())
+    {
+        // Pick up leader's spline velocity
+        velocity = target->movespline->Velocity();
+
+        // Calculate travel distance to get a 1650ms result
+        float travelDist = velocity * 1.65f;
+        target->MovePositionToFirstCollision(dest, travelDist, relativeAngle);
+        target->MovePositionToFirstCollision(dest, _range, _angle + relativeAngle);
+
+        float distance = owner->GetExactDist(dest);
+        float velocityMod = std::min<float>(distance / travelDist, 1.5f);
+
+        velocity *= velocityMod;
+        _hasPredictedDestination = true;
+    }
+    else
+    {
+        target->MovePositionToFirstCollision(dest, _range, _angle + relativeAngle);
+        _hasPredictedDestination = false;
+    }
+
+    if (velocity == 0.0f)
+        velocity = target->GetSpeed(MOVE_WALK);
+
+    Movement::MoveSplineInit init(owner);
+    init.MoveTo(dest.GetPositionX(), dest.GetPositionY(), dest.GetPositionZ());
+    init.SetVelocity(velocity);
+    init.Launch();
+
+    _lastLeaderPosition.Relocate(target->GetPosition());
+    _isMoving = true;
+    owner->AddUnitState(UNIT_STATE_FOLLOW_MOVE);
+}
+
+void FormationMovementGenerator::MovementInform(Creature* owner)
+{
+    if (owner->AI())
+        owner->AI()->MovementInform(FORMATION_MOTION_TYPE, 0);
+}

src/server/game/Movement/MovementGenerators/FormationMovementGenerator.h

@@ -0,0 +1,58 @@
+/*
+ * This file is part of the AzerothCore 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/>.
+ */
+
+#ifndef ACORE_FORMATIONMOVEMENTGENERATOR_H
+#define ACORE_FORMATIONMOVEMENTGENERATOR_H
+
+#include "AbstractFollower.h"
+#include "MovementGenerator.h"
+#include "Position.h"
+#include "Timer.h"
+
+class Creature;
+
+class FormationMovementGenerator : public MovementGeneratorMedium<Creature, FormationMovementGenerator>, public AbstractFollower
+{
+public:
+    explicit FormationMovementGenerator(Unit* leader, float range, float angle, uint32 point1, uint32 point2);
+
+    MovementGeneratorType GetMovementGeneratorType() { return FORMATION_MOTION_TYPE; }
+
+    void DoInitialize(Creature*);
+    void DoFinalize(Creature*);
+    void DoReset(Creature*);
+    bool DoUpdate(Creature*, uint32);
+
+private:
+    void MovementInform(Creature* owner);
+    void LaunchMovement(Creature* owner, Unit* target);
+
+    static constexpr uint32 FORMATION_MOVEMENT_INTERVAL = 1200;
+
+    float const _range;
+    float _angle;
+    uint32 const _point1;
+    uint32 const _point2;
+    uint32 _lastLeaderSplineID;
+    bool _hasPredictedDestination;
+    bool _isMoving;
+
+    Position _lastLeaderPosition;
+    TimeTracker _nextMoveTimer;
+};
+
+#endif

src/server/game/Movement/MovementGenerators/RandomMovementGenerator.cpp

@@ -67,8 +67,8 @@ void RandomMovementGenerator<Creature>::_setRandomLocation(Creature* creature)
 
         init.SetWalk(walk);
         init.Launch();
-        if (creature->GetFormation() && creature->GetFormation()->GetLeader() == creature)
-            creature->GetFormation()->LeaderMoveTo(_currDestPosition.GetPositionX(), _currDestPosition.GetPositionY(), _currDestPosition.GetPositionZ(), 0);
+        if (creature->GetFormation() && creature->GetFormation()->GetLeader() == creature && creature->GetFormation()->CanLeaderStartMoving())
+            creature->GetFormation()->LeaderStartedMoving();
         return;
     }
 
@@ -242,8 +242,8 @@ void RandomMovementGenerator<Creature>::_setRandomLocation(Creature* creature)
     }
 
     //Call for creature group update
-    if (creature->GetFormation() && creature->GetFormation()->GetLeader() == creature)
-        creature->GetFormation()->LeaderMoveTo(finalPoint.x, finalPoint.y, finalPoint.z, 0);
+    if (creature->GetFormation() && creature->GetFormation()->GetLeader() == creature && creature->GetFormation()->CanLeaderStartMoving())
+        creature->GetFormation()->LeaderStartedMoving();
 
     if (sWorld->getBoolConfig(CONFIG_DONT_CACHE_RANDOM_MOVEMENT_PATHS))
         _preComputedPaths.erase(pathIdx);

src/server/game/Movement/MovementGenerators/TargetedMovementGenerator.h

@@ -18,21 +18,14 @@
 #ifndef ACORE_TARGETEDMOVEMENTGENERATOR_H
 #define ACORE_TARGETEDMOVEMENTGENERATOR_H
 
-#include "FollowerReference.h"
+#include "AbstractFollower.h"
 #include "MovementGenerator.h"
 #include "Optional.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;
-};
+using TargetedMovementGeneratorBase = AbstractFollower;
 
 enum ChaseMovementMode
 {
@@ -43,11 +36,11 @@ enum ChaseMovementMode
 };
 
 template<class T>
-class ChaseMovementGenerator : public MovementGeneratorMedium<T, ChaseMovementGenerator<T>>, public TargetedMovementGeneratorBase
+class ChaseMovementGenerator : public MovementGeneratorMedium<T, ChaseMovementGenerator<T>>, public AbstractFollower
 {
 public:
     ChaseMovementGenerator(Unit* target, Optional<ChaseRange> range = {}, Optional<ChaseAngle> angle = {})
-        : TargetedMovementGeneratorBase(target), i_leashExtensionTimer(5000), i_path(nullptr), i_recheckDistance(0), i_recalculateTravel(true), _range(range), _angle(angle), m_currentMode(CHASE_MODE_NORMAL) {}
+        : AbstractFollower(target), i_leashExtensionTimer(5000), i_path(nullptr), i_recheckDistance(0), i_recalculateTravel(true), _range(range), _angle(angle), m_currentMode(CHASE_MODE_NORMAL) {}
     ~ChaseMovementGenerator() { }
 
     MovementGeneratorType GetMovementGeneratorType() { return CHASE_MOTION_TYPE; }
@@ -61,7 +54,7 @@ public:
     bool PositionOkay(T* owner, Unit* target, Optional<float> maxDistance, Optional<ChaseAngle> angle);
 
     void unitSpeedChanged() { _lastTargetPosition.reset(); }
-    Unit* GetTarget() const { return i_target.getTarget(); }
+    Unit* GetTarget() const { return AbstractFollower::GetTarget(); }
 
     bool EnableWalking() const { return false; }
     bool HasLostTarget(Unit* unit) const { return unit->GetVictim() != this->GetTarget(); }
@@ -87,11 +80,11 @@ private:
 };
 
 template<class T>
-class FollowMovementGenerator : public MovementGeneratorMedium<T, FollowMovementGenerator<T>>, public TargetedMovementGeneratorBase
+class FollowMovementGenerator : public MovementGeneratorMedium<T, FollowMovementGenerator<T>>, public AbstractFollower
 {
 public:
     FollowMovementGenerator(Unit* target, float range, ChaseAngle angle, bool inheritWalkState, bool inheritSpeed)
-        : TargetedMovementGeneratorBase(target), i_path(nullptr), i_recheckPredictedDistanceTimer(0), i_recheckPredictedDistance(false), _range(range), _angle(angle), _inheritWalkState(inheritWalkState), _inheritSpeed(inheritSpeed) {}
+        : AbstractFollower(target), i_path(nullptr), i_recheckPredictedDistanceTimer(0), i_recheckPredictedDistance(false), _range(range), _angle(angle), _inheritWalkState(inheritWalkState), _inheritSpeed(inheritSpeed) {}
     ~FollowMovementGenerator() { }
 
     MovementGeneratorType GetMovementGeneratorType() { return FOLLOW_MOTION_TYPE; }
@@ -102,7 +95,7 @@ public:
     void DoReset(T*);
     void MovementInform(T*);
 
-    Unit* GetTarget() const { return i_target.getTarget(); }
+    Unit* GetTarget() const { return AbstractFollower::GetTarget(); }
 
     void unitSpeedChanged() { _lastTargetPosition.reset(); }
 

src/server/game/Movement/MovementGenerators/WaypointMovementGenerator.cpp

@@ -222,8 +222,8 @@ bool WaypointMovementGenerator<Creature>::StartMove(Creature* creature)
     init.Launch();
 
     //Call for creature group update
-    if (creature->GetFormation() && creature->GetFormation()->GetLeader() == creature)
-        creature->GetFormation()->LeaderMoveTo(formationDest.x, formationDest.y, formationDest.z, node.move_type);
+    if (creature->GetFormation() && creature->GetFormation()->GetLeader() == creature && creature->GetFormation()->CanLeaderStartMoving())
+        creature->GetFormation()->LeaderStartedMoving();
 
     return true;
 }

src/server/game/Movement/Spline/MoveSpline.cpp

@@ -166,6 +166,7 @@ namespace Movement
         time_passed = 0;
         vertical_acceleration = 0.f;
         effect_start_time = 0;
+        velocity = args.velocity;
 
         // Check if its a stop spline
         if (args.flags.done)
@@ -190,7 +191,7 @@ namespace Movement
     }
 
     MoveSpline::MoveSpline() : m_Id(0), time_passed(0),
-        vertical_acceleration(0.f), initialOrientation(0.f), effect_start_time(0), point_Idx(0), point_Idx_offset(0),
+        vertical_acceleration(0.f), initialOrientation(0.f), velocity(0.f), effect_start_time(0), point_Idx(0), point_Idx_offset(0),
         onTransport(false)
     {
         splineflags.done = true;

src/server/game/Movement/Spline/MoveSpline.h

@@ -64,6 +64,7 @@ namespace Movement
         //float           duration_mod_next;
         float           vertical_acceleration;
         float           initialOrientation;
+        float           velocity;
         int32           effect_start_time;
         int32           point_Idx;
         int32           point_Idx_offset;
@@ -85,6 +86,7 @@ namespace Movement
         [[nodiscard]] int32 Duration() const { return spline.length(); }
         [[nodiscard]] MySpline const& _Spline() const { return spline; }
         [[nodiscard]] int32 _currentSplineIdx() const { return point_Idx; }
+        [[nodiscard]] float Velocity() const { return velocity; }
         void _Finalize();
         void _Interrupt() { splineflags.done = true; }