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/*
* gidmapper.h
* Copyright 2011, Thorbjørn Lindeijer <thorbjorn@lindeijer.nl>
*
* This file is part of libtiled.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef TILED_GIDMAPPER_H
#define TILED_GIDMAPPER_H
#include "tilelayer.h"
#include <QMap>
namespace Tiled {
/**
* A class that maps cells to global IDs (gids) and back.
*/
class TILEDSHARED_EXPORT GidMapper
{
public:
/**
* Default constructor. Use \l insert to initialize the gid mapper
* incrementally.
*/
GidMapper();
/**
* Constructor that initializes the gid mapper using the given \a tilesets.
*/
GidMapper(const QList<Tileset *> &tilesets);
/**
* Insert the given \a tileset with \a firstGid as its first global ID.
*/
void insert(uint firstGid, Tileset *tileset)
{ mFirstGidToTileset.insert(firstGid, tileset); }
/**
* Clears the gid mapper, so that it can be reused.
*/
void clear() { mFirstGidToTileset.clear(); }
/**
* Returns true when no tilesets are known to this gid mapper.
*/
bool isEmpty() const { return mFirstGidToTileset.isEmpty(); }
/**
* Returns the cell data matched by the given \a gid. The \a ok parameter
* indicates whether an error occurred.
*/
Cell gidToCell(uint gid, bool &ok) const;
/**
* Returns the global tile ID for the given \a cell. Returns 0 when the
* cell is empty or when its tileset isn't known.
*/
uint cellToGid(const Cell &cell) const;
/**
* This sets the original tileset width. In case the image size has
* changed, the tile indexes will be adjusted automatically when using
* gidToCell().
*/
void setTilesetWidth(const Tileset *tileset, int width);
private:
QMap<uint, Tileset*> mFirstGidToTileset;
QMap<const Tileset*, int> mTilesetColumnCounts;
};
} // namespace Tiled
#endif // TILED_GIDMAPPER_H
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