DetourProximityGrid.h

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//
// Copyright (c) 2009-2010 Mikko Mononen memon@inside.org
//
// This software is provided 'as-is', without any express or implied
// warranty.  In no event will the authors be held liable for any damages
// arising from the use of this software.
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
// 1. The origin of this software must not be misrepresented; you must not
//    claim that you wrote the original software. If you use this software
//    in a product, an acknowledgment in the product documentation would be
//    appreciated but is not required.
// 2. Altered source versions must be plainly marked as such, and must not be
//    misrepresented as being the original software.
// 3. This notice may not be removed or altered from any source distribution.
//

#ifndef DETOURPROXIMITYGRID_H
#define DETOURPROXIMITYGRID_H

class dtProximityGrid
{
        int m_maxItems;
        float m_cellSize;
        float m_invCellSize;
        
        struct Item
        {
                unsigned short id;
                short x,y;
                unsigned short next;
        };
        Item* m_pool;
        int m_poolHead;
        int m_poolSize;
        
        unsigned short* m_buckets;
        int m_bucketsSize;
        
        int m_bounds[4];
        
public:
        dtProximityGrid();
        ~dtProximityGrid();
        
        bool init(const int maxItems, const float cellSize);
        
        void clear();
        
        void addItem(const unsigned short id,
                                 const float minx, const float miny,
                                 const float maxx, const float maxy);
        
        int queryItems(const float minx, const float miny,
                                   const float maxx, const float maxy,
                                   unsigned short* ids, const int maxIds) const;
        
        int getItemCountAt(const int x, const int y) const;
        
        inline const int* getBounds() const { return m_bounds; }
        inline const float getCellSize() const { return m_cellSize; }
};

dtProximityGrid* dtAllocProximityGrid();
void dtFreeProximityGrid(dtProximityGrid* ptr);


#endif // DETOURPROXIMITYGRID_H