[9065] Implement motionmaster function UpdateFinalDistanceToTarget()

To update a creatures distance to it's target without creating a new movement generator. Note it can only be used where creature is using TargetedMovementGenerator.

Signed-off-by: NoFantasy <nofantasy@nf.no>

src/game/MotionMaster.cpp

@@ -463,3 +463,12 @@ bool MotionMaster::GetDestination(float &x, float &y, float &z)
 
    return top()->GetDestination(x,y,z);
 }
+
+void MotionMaster::UpdateFinalDistanceToTarget(float fDistance)
+{
+    if (!empty())
+    {
+        if (top()->GetMovementGeneratorType() == TARGETED_MOTION_TYPE)
+            top()->UpdateFinalDistance(fDistance);
+    }
+}

src/game/MotionMaster.h

@@ -121,6 +121,9 @@ class MANGOS_DLL_SPEC MotionMaster : private std::stack<MovementGenerator *>
 
         void propagateSpeedChange();
 
+        // will only work in MMgens where we have a target (TARGETED_MOTION_TYPE)
+        void UpdateFinalDistanceToTarget(float fDistance);
+
         bool GetDestination(float &x, float &y, float &z);
     private:
         void Mutate(MovementGenerator *m);                  // use Move* functions instead

src/game/MovementGenerator.h

@@ -44,6 +44,8 @@ class MANGOS_DLL_SPEC MovementGenerator
 
         virtual void unitSpeedChanged() { }
 
+        virtual void UpdateFinalDistance(float fDistance) { }
+
         virtual bool GetDestination(float& /*x*/, float& /*y*/, float& /*z*/) const { return false; }
 };
 

src/game/TargetedMovementGenerator.cpp

@@ -102,6 +102,19 @@ void TargetedMovementGenerator<Creature>::Initialize(Creature &owner)
     _setTargetLocation(owner);
 }
 
+template<>
+void TargetedMovementGenerator<Player>::UpdateFinalDistance(float fDistance)
+{
+    // nothing to do for Player
+}
+
+template<>
+void TargetedMovementGenerator<Creature>::UpdateFinalDistance(float fDistance)
+{
+    i_offset = fDistance;
+    i_recalculateTravel = true;
+}
+
 template<>
 void TargetedMovementGenerator<Player>::Initialize(Player &owner)
 {

src/game/TargetedMovementGenerator.h

@@ -61,6 +61,8 @@ class MANGOS_DLL_SPEC TargetedMovementGenerator
         }
 
         void unitSpeedChanged() { i_recalculateTravel=true; }
+        void UpdateFinalDistance(float fDistance);
+
     private:
 
         void _setTargetLocation(T &);

src/shared/revision_nr.h

@@ -1,4 +1,4 @@
 #ifndef __REVISION_NR_H__
 #define __REVISION_NR_H__
- #define REVISION_NR "9064"
+ #define REVISION_NR "9065"
 #endif // __REVISION_NR_H__