Core/Entities: Take terrain swaps into account when calculating LoS/height/area

src/server/game/Phasing/PhaseShift.cpp

@@ -17,6 +17,8 @@
 
 #include "PhaseShift.h"
 #include "Containers.h"
+#include "GridDefines.h"
+#include "VMapFactory.h"
 
 bool PhaseShift::AddPhase(uint32 phaseId, PhaseFlags flags, PhaseInfoStruct const* phase, std::vector<Condition*> const* areaConditions, int32 references /*= 1*/)
 {
@@ -145,6 +147,33 @@ bool PhaseShift::CanSee(PhaseShift const& other) const
     return checkInversePhaseShift(other, *this);
 }
 
+uint32 PhaseShift::GetTerrainMapId(uint32 realMapId, float x, float y) const
+{
+    if (VisibleMapIds.empty())
+        return realMapId;
+
+    if (VisibleMapIds.size() == 1)
+        return VisibleMapIds.begin()->first;
+
+    GridCoord gridCoord = Trinity::ComputeGridCoord(x, y);
+    int32 gx = (MAX_NUMBER_OF_GRIDS - 1) - gridCoord.x_coord;
+    int32 gy = (MAX_NUMBER_OF_GRIDS - 1) - gridCoord.y_coord;
+
+    int32 minDistance = std::numeric_limits<int32>::max();
+    uint32 terrainMapId;
+    for (auto itr = VisibleMapIds.begin(); itr != VisibleMapIds.end(); ++itr)
+    {
+        int32 dist = VMAP::VMapFactory::createOrGetVMapManager()->GetDistanceToClosestPrimaryTile(itr->first, gx, gy);
+        if (dist < minDistance)
+        {
+            minDistance = dist;
+            terrainMapId = itr->first;
+        }
+    }
+
+    return terrainMapId;
+}
+
 void PhaseShift::ModifyPhasesReferences(PhaseContainer::iterator itr, int32 references)
 {
     itr->References += references;