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/* $Id$ */
/*
* This file is part of OpenTTD.
* OpenTTD 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, version 2.
* OpenTTD 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file tilearea_type.h Type for storing the 'area' of something uses on the map. */
#ifndef TILEAREA_TYPE_H
#define TILEAREA_TYPE_H
#include "map_func.h"
/** Represents the covered area of e.g. a rail station */
struct TileArea {
TileIndex tile; ///< The base tile of the area
uint16 w; ///< The width of the area
uint16 h; ///< The height of the area
/** Just construct this tile area */
TileArea() {}
/**
* Construct this tile area with some set values
* @param tile the base tile
* @param w the width
* @param h the height
*/
TileArea(TileIndex tile, uint8 w, uint8 h) : tile(tile), w(w), h(h) {}
TileArea(TileIndex start, TileIndex end);
void Add(TileIndex to_add);
/**
* Clears the 'tile area', i.e. make the tile invalid.
*/
void Clear()
{
this->tile = INVALID_TILE;
this->w = 0;
this->h = 0;
}
bool Intersects(const TileArea &ta) const;
void ClampToMap();
/**
* Get the center tile.
* @return The tile at the center, or just north of it.
*/
TileIndex GetCenterTile() const
{
return TILE_ADDXY(this->tile, this->w / 2, this->h / 2);
}
};
/** Base class for tile iterators. */
class TileIterator {
protected:
TileIndex tile; ///< The current tile we are at.
/**
* Initialise the iterator starting at this tile.
* @param tile The tile we start iterating from.
*/
TileIterator(TileIndex tile) : tile(tile)
{
}
public:
/** Some compilers really like this. */
virtual ~TileIterator()
{
}
/**
* Get the tile we are currently at.
* @return The tile we are at, or INVALID_TILE when we're done.
*/
FORCEINLINE operator TileIndex () const
{
return this->tile;
}
/**
* Move ourselves to the next tile in the rectange on the map.
*/
virtual TileIterator& operator ++() = 0;
};
/** Iterator to iterate over a tile area (rectangle) of the map. */
class OrthogonalTileIterator : public TileIterator {
private:
int w; ///< The width of the iterated area.
int x; ///< The current 'x' position in the rectangle.
int y; ///< The current 'y' position in the rectangle.
public:
/**
* Construct the iterator.
* @param ta Area, i.e. begin point and width/height of to-be-iterated area.
*/
OrthogonalTileIterator(const TileArea &ta) : TileIterator(ta.w == 0 || ta.h == 0 ? INVALID_TILE : ta.tile), w(ta.w), x(ta.w), y(ta.h)
{
}
/**
* Move ourselves to the next tile in the rectange on the map.
*/
FORCEINLINE TileIterator& operator ++()
{
assert(this->tile != INVALID_TILE);
if (--this->x > 0) {
this->tile++;
} else if (--this->y > 0) {
this->x = this->w;
this->tile += TileDiffXY(1, 1) - this->w;
} else {
this->tile = INVALID_TILE;
}
return *this;
}
};
/** Iterator to iterate over a diagonal area of the map. */
class DiagonalTileIterator : public TileIterator {
private:
uint base_x, base_y; ///< The base tile x and y coordinates from where the iterating happens.
int a_cur, b_cur; ///< The current (rotated) x and y coordinates of the iteration.
int a_max, b_max; ///< The (rotated) x and y coordinates of the end of the iteration.
public:
DiagonalTileIterator(TileIndex begin, TileIndex end);
TileIterator& operator ++();
};
/**
* A loop which iterates over the tiles of a TileArea.
* @param var The name of the variable which contains the current tile.
* This variable will be allocated in this \c for of this loop.
* @param ta The tile area to search over.
*/
#define TILE_AREA_LOOP(var, ta) for (OrthogonalTileIterator var(ta); var != INVALID_TILE; ++var)
#endif /* TILEAREA_TYPE_H */
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