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diff --git a/src/server/game/Grids/GridDefines.h b/src/server/game/Grids/GridDefines.h
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+++ b/src/server/game/Grids/GridDefines.h
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+/*
+ * Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
+ *
+ * Copyright (C) 2008-2010 Trinity <http://www.trinitycore.org/>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef TRINITY_GRIDDEFINES_H
+#define TRINITY_GRIDDEFINES_H
+
+#include "Common.h"
+#include "GameSystem/NGrid.h"
+#include <cmath>
+
+// Forward class definitions
+class Corpse;
+class Creature;
+class DynamicObject;
+class GameObject;
+class Pet;
+class Player;
+
+#define MAX_NUMBER_OF_CELLS     8
+
+#define MAX_NUMBER_OF_GRIDS      64
+
+#define SIZE_OF_GRIDS            533.33333f
+#define CENTER_GRID_ID           (MAX_NUMBER_OF_GRIDS/2)
+
+#define CENTER_GRID_OFFSET      (SIZE_OF_GRIDS/2)
+
+#define MIN_GRID_DELAY          (MINUTE*IN_MILISECONDS)
+#define MIN_MAP_UPDATE_DELAY    50
+
+#define SIZE_OF_GRID_CELL       (SIZE_OF_GRIDS/MAX_NUMBER_OF_CELLS)
+
+#define CENTER_GRID_CELL_ID     (MAX_NUMBER_OF_CELLS*MAX_NUMBER_OF_GRIDS/2)
+#define CENTER_GRID_CELL_OFFSET (SIZE_OF_GRID_CELL/2)
+
+#define TOTAL_NUMBER_OF_CELLS_PER_MAP    (MAX_NUMBER_OF_GRIDS*MAX_NUMBER_OF_CELLS)
+
+#define MAP_RESOLUTION 128
+
+#define MAP_SIZE                (SIZE_OF_GRIDS*MAX_NUMBER_OF_GRIDS)
+#define MAP_HALFSIZE            (MAP_SIZE/2)
+
+// Creature used instead pet to simplify *::Visit templates (not required duplicate code for Creature->Pet case)
+typedef TYPELIST_4(Player, Creature/*pets*/, Corpse/*resurrectable*/, DynamicObject/*farsight target*/) AllWorldObjectTypes;
+typedef TYPELIST_4(GameObject, Creature/*except pets*/, DynamicObject, Corpse/*Bones*/) AllGridObjectTypes;
+
+typedef GridRefManager<Corpse>          CorpseMapType;
+typedef GridRefManager<Creature>        CreatureMapType;
+typedef GridRefManager<DynamicObject>   DynamicObjectMapType;
+typedef GridRefManager<GameObject>      GameObjectMapType;
+typedef GridRefManager<Player>          PlayerMapType;
+
+typedef Grid<Player, AllWorldObjectTypes,AllGridObjectTypes> GridType;
+typedef NGrid<MAX_NUMBER_OF_CELLS, Player, AllWorldObjectTypes, AllGridObjectTypes> NGridType;
+
+typedef TypeMapContainer<AllGridObjectTypes> GridTypeMapContainer;
+typedef TypeMapContainer<AllWorldObjectTypes> WorldTypeMapContainer;
+
+template<const unsigned int LIMIT>
+struct CoordPair
+{
+    CoordPair(uint32 x=0, uint32 y=0) : x_coord(x), y_coord(y) {}
+    CoordPair(const CoordPair<LIMIT> &obj) : x_coord(obj.x_coord), y_coord(obj.y_coord) {}
+    bool operator == (const CoordPair<LIMIT> &obj) const { return (obj.x_coord == x_coord && obj.y_coord == y_coord); }
+    bool operator != (const CoordPair<LIMIT> &obj) const { return !operator == (obj); }
+    CoordPair<LIMIT>& operator=(const CoordPair<LIMIT> &obj)
+    {
+        x_coord = obj.x_coord;
+        y_coord = obj.y_coord;
+        return *this;
+    }
+
+    void operator<<(const uint32 val)
+    {
+        if (x_coord > val)
+            x_coord -= val;
+        else
+            x_coord = 0;
+    }
+
+    void operator>>(const uint32 val)
+    {
+        if (x_coord+val < LIMIT)
+            x_coord += val;
+        else
+            x_coord = LIMIT - 1;
+    }
+
+    void operator-=(const uint32 val)
+    {
+        if (y_coord > val)
+            y_coord -= val;
+        else
+            y_coord = 0;
+    }
+
+    void operator+=(const uint32 val)
+    {
+        if (y_coord+val < LIMIT)
+            y_coord += val;
+        else
+            y_coord = LIMIT - 1;
+    }
+
+    uint32 x_coord;
+    uint32 y_coord;
+};
+
+typedef CoordPair<MAX_NUMBER_OF_GRIDS> GridPair;
+typedef CoordPair<TOTAL_NUMBER_OF_CELLS_PER_MAP> CellPair;
+
+namespace Trinity
+{
+    template<class RET_TYPE, int CENTER_VAL>
+        inline RET_TYPE Compute(float x, float y, float center_offset, float size)
+    {
+        // calculate and store temporary values in double format for having same result as same mySQL calculations
+        double x_offset = (double(x) - center_offset)/size;
+        double y_offset = (double(y) - center_offset)/size;
+
+        int x_val = int(x_offset+CENTER_VAL + 0.5);
+        int y_val = int(y_offset+CENTER_VAL + 0.5);
+        return RET_TYPE(x_val, y_val);
+    }
+
+    inline GridPair ComputeGridPair(float x, float y)
+    {
+        return Compute<GridPair, CENTER_GRID_ID>(x, y, CENTER_GRID_OFFSET, SIZE_OF_GRIDS);
+    }
+
+    inline CellPair ComputeCellPair(float x, float y)
+    {
+        return Compute<CellPair, CENTER_GRID_CELL_ID>(x, y, CENTER_GRID_CELL_OFFSET, SIZE_OF_GRID_CELL);
+    }
+
+    inline CellPair ComputeCellPair(float x, float y, float &x_off, float &y_off)
+    {
+        double x_offset = (double(x) - CENTER_GRID_CELL_OFFSET)/SIZE_OF_GRID_CELL;
+        double y_offset = (double(y) - CENTER_GRID_CELL_OFFSET)/SIZE_OF_GRID_CELL;
+
+        int x_val = int(x_offset + CENTER_GRID_CELL_ID + 0.5);
+        int y_val = int(y_offset + CENTER_GRID_CELL_ID + 0.5);
+        x_off = (float(x_offset) - x_val + CENTER_GRID_CELL_ID) * SIZE_OF_GRID_CELL;
+        y_off = (float(y_offset) - y_val + CENTER_GRID_CELL_ID) * SIZE_OF_GRID_CELL;
+        return CellPair(x_val, y_val);
+    }
+
+    inline void NormalizeMapCoord(float &c)
+    {
+        if (c > MAP_HALFSIZE - 0.5)
+            c = MAP_HALFSIZE - 0.5;
+        else if (c < -(MAP_HALFSIZE - 0.5))
+            c = -(MAP_HALFSIZE - 0.5);
+    }
+
+    inline bool IsValidMapCoord(float c)
+    {
+        return finite(c) && (std::fabs(c) <= MAP_HALFSIZE - 0.5);
+    }
+
+    inline bool IsValidMapCoord(float x, float y)
+    {
+        return IsValidMapCoord(x) && IsValidMapCoord(y);
+    }
+
+    inline bool IsValidMapCoord(float x, float y, float z)
+    {
+        return IsValidMapCoord(x,y) && finite(z);
+    }
+
+    inline bool IsValidMapCoord(float x, float y, float z, float o)
+    {
+        return IsValidMapCoord(x,y,z) && finite(o);
+    }
+}
+#endif