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
{
    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 poolSize, 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 float getCellSize() const { return m_cellSize; }
 
private:
    // Explicitly disabled copy constructor and copy assignment operator.
    dtProximityGrid(const dtProximityGrid&);
    dtProximityGrid& operator=(const dtProximityGrid&);
};
 
dtProximityGrid* dtAllocProximityGrid();
void dtFreeProximityGrid(dtProximityGrid* ptr);
 
 
#endif // DETOURPROXIMITYGRID_H