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/*
Copyright (C) 2011-2013 Paul Davis
Author: Carl Hetherington <cth@carlh.net>
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __CANVAS_LOOKUP_TABLE_H__
#define __CANVAS_LOOKUP_TABLE_H__
#include <vector>
#include <boost/multi_array.hpp>
#include "canvas/visibility.h"
#include "canvas/types.h"
class OptimizingLookupTableTest;
namespace ArdourCanvas {
class Item;
class LIBCANVAS_API LookupTable
{
public:
LookupTable (Item const &);
virtual ~LookupTable ();
virtual std::vector<Item*> get (Rect const &) = 0;
virtual std::vector<Item*> items_at_point (Duple const &) const = 0;
virtual bool has_item_at_point (Duple const & point) const = 0;
protected:
Item const & _item;
};
class LIBCANVAS_API DumbLookupTable : public LookupTable
{
public:
DumbLookupTable (Item const &);
std::vector<Item*> get (Rect const &);
std::vector<Item*> items_at_point (Duple const &) const;
bool has_item_at_point (Duple const & point) const;
};
class LIBCANVAS_API OptimizingLookupTable : public LookupTable
{
public:
OptimizingLookupTable (Item const &, int);
~OptimizingLookupTable ();
std::vector<Item*> get (Rect const &);
std::vector<Item*> items_at_point (Duple const &) const;
bool has_item_at_point (Duple const & point) const;
static int default_items_per_cell;
private:
void area_to_indices (Rect const &, int &, int &, int &, int &) const;
void point_to_indices (Duple, int &, int &) const;
friend class ::OptimizingLookupTableTest;
typedef std::vector<Item*> Cell;
int _items_per_cell;
int _dimension;
Duple _cell_size;
Duple _offset;
Cell** _cells;
bool _added;
};
}
#endif
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