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(svn r11066) -Documentation [FS#1091]: of map.*. Patch by Progman.

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rubidium
2007-09-09 10:21:27 +00:00
parent 65f9a0f21a
commit ed3b1d398a
2 changed files with 166 additions and 29 deletions
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162
src/map.h
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@@ -45,9 +45,25 @@ struct TileExtended {
byte m7; ///< Primarily used for newgrf support
};
/**
* Pointer to the tile-array.
*
* This variable points to the tile-array which contains the tiles of
* the map.
*/
extern Tile *_m;
/**
* Pointer to the extended tile-array.
*
* This variable points to the extended tile-array which contains the tiles
* of the map.
*/
extern TileExtended *_me;
/**
* Allocate a new map with the given size.
*/
void AllocateMap(uint size_x, uint size_y);
/**
@@ -109,18 +125,56 @@ static inline uint MapMaxY()
return MapSizeY() - 1;
}
/* Scale a number relative to the map size */
uint ScaleByMapSize(uint); // Scale relative to the number of tiles
uint ScaleByMapSize1D(uint); // Scale relative to the circumference of the map
/**
* Scales relative to the number of tiles.
*/
uint ScaleByMapSize(uint);
/**
* Scale relative to the circumference of the map.
*/
uint ScaleByMapSize1D(uint);
/**
* The index/ID of a Tile.
*/
typedef uint32 TileIndex;
/**
* An offset value between to tiles.
*
* This value is used fro the difference between
* to tiles. It can be added to a tileindex to get
* the resulting tileindex of the start tile applied
* with this saved difference.
*
* @see TileDiffXY(int, int)
*/
typedef int32 TileIndexDiff;
/**
* Returns the TileIndex of a coordinate.
*
* @param x The x coordinate of the tile
* @param y The y coordinate of the tile
* @return The TileIndex calculated by the coordinate
*/
static inline TileIndex TileXY(uint x, uint y)
{
return (y * MapSizeX()) + x;
}
/**
* Calculates an offset for the given coordinate(-offset).
*
* This function calculate an offset value which can be added to an
* #TileIndex. The coordinates can be negative.
*
* @param x The offset in x direction
* @param y The offset in y direction
* @return The resulting offset value of the given coordinate
* @see ToTileIndexDiff(TileIndexDiffC)
*/
static inline TileIndexDiff TileDiffXY(int x, int y)
{
/* Multiplication gives much better optimization on MSVC than shifting.
@@ -167,12 +221,27 @@ static inline uint TileY(TileIndex tile)
return tile >> MapLogX();
}
/**
* A pair-construct of a TileIndexDiff.
*
* This can be used to save the difference between to
* tiles as a pair of x and y value.
*/
struct TileIndexDiffC {
int16 x;
int16 y;
int16 x; ///< The x value of the coordinate
int16 y; ///< The y value of the coordinate
};
/**
* Return the offset between to tiles from a TileIndexDiffC struct.
*
* This function works like #TileDiffXY(int, int) and returns the
* difference between two tiles.
*
* @param tidc The coordinate of the offset as TileIndexDiffC
* @return The difference between two tiles.
* @see TileDiffXY(int, int)
*/
static inline TileIndexDiff ToTileIndexDiff(TileIndexDiffC tidc)
{
return (tidc.y << MapLogX()) + tidc.x;
@@ -180,6 +249,13 @@ static inline TileIndexDiff ToTileIndexDiff(TileIndexDiffC tidc)
#ifndef _DEBUG
/**
* Adds to tiles together.
*
* @param x One tile
* @param y An other tile to add
* @return The resulting tile(index)
*/
#define TILE_ADD(x,y) ((x) + (y))
#else
extern TileIndex TileAdd(TileIndex tile, TileIndexDiff add,
@@ -187,10 +263,26 @@ static inline TileIndexDiff ToTileIndexDiff(TileIndexDiffC tidc)
#define TILE_ADD(x, y) (TileAdd((x), (y), #x " + " #y, __FILE__, __LINE__))
#endif
/**
* Adds a given offset to a tile.
*
* @param tile The tile to add an offset on it
* @param x The x offset to add to the tile
* @param y The y offset to add to the tile
*/
#define TILE_ADDXY(tile, x, y) TILE_ADD(tile, TileDiffXY(x, y))
/**
* Adds an offset to a tile and check if we are still on the map.
*/
uint TileAddWrap(TileIndex tile, int addx, int addy);
/**
* Returns the TileIndexDiffC offset from a DiagDirection.
*
* @param dir The given direction
* @return The offset as TileIndexDiffC value
*/
static inline TileIndexDiffC TileIndexDiffCByDiagDir(DiagDirection dir)
{
extern const TileIndexDiffC _tileoffs_by_diagdir[DIAGDIR_END];
@@ -198,9 +290,15 @@ static inline TileIndexDiffC TileIndexDiffCByDiagDir(DiagDirection dir)
assert(IsValidDiagDirection(dir));
return _tileoffs_by_diagdir[dir];
}
/* Returns tile + the diff given in diff. If the result tile would end up
/**
* Add a TileIndexDiffC to a TileIndex and returns the new one.
*
* Returns tile + the diff given in diff. If the result tile would end up
* outside of the map, INVALID_TILE is returned instead.
*
* @param tile The base tile to add the offset on
* @param diff The offset to add on the tile
* @return The resulting TileIndex
*/
static inline TileIndex AddTileIndexDiffCWrap(TileIndex tile, TileIndexDiffC diff)
{
@@ -236,7 +334,16 @@ uint DistanceMax(TileIndex, TileIndex); ///< also known as L-Infinity-Norm
uint DistanceMaxPlusManhattan(TileIndex, TileIndex); ///< Max + Manhattan
uint DistanceFromEdge(TileIndex); ///< shortest distance from any edge of the map
/**
* Starts a loop which iterates to a square of tiles
*
* This macro starts 2 nested loops which iterates over a square of tiles.
*
* @param var The name of the variable which contains the current tile
* @param w The width (x-width) of the square
* @param h The heigth (y-width) of the square
* @param tile The start tile of the square
*/
#define BEGIN_TILE_LOOP(var, w, h, tile) \
{ \
int h_cur = h; \
@@ -244,12 +351,22 @@ uint DistanceFromEdge(TileIndex); ///< shortest distance from any edge of the ma
do { \
int w_cur = w; \
do {
/**
* Ends the square-loop used before
*
* @see BEGIN_TILE_LOOP
*/
#define END_TILE_LOOP(var, w, h, tile) \
} while (++var, --w_cur != 0); \
} while (var += TileDiffXY(0, 1) - (w), --h_cur != 0); \
}
/**
* Convert a DiagDirection to a TileIndexDiff
*
* @param dir The DiagDirection
* @return The resulting TileIndexDiff
* @see TileIndexDiffCByDiagDir
*/
static inline TileIndexDiff TileOffsByDiagDir(DiagDirection dir)
{
extern const TileIndexDiffC _tileoffs_by_diagdir[DIAGDIR_END];
@@ -258,6 +375,12 @@ static inline TileIndexDiff TileOffsByDiagDir(DiagDirection dir)
return ToTileIndexDiff(_tileoffs_by_diagdir[dir]);
}
/**
* Convert a Direction to a TileIndexDiff.
*
* @param dir The direction to convert from
* @return The resulting TileIndexDiff
*/
static inline TileIndexDiff TileOffsByDir(Direction dir)
{
extern const TileIndexDiffC _tileoffs_by_dir[DIR_END];
@@ -266,11 +389,24 @@ static inline TileIndexDiff TileOffsByDir(Direction dir)
return ToTileIndexDiff(_tileoffs_by_dir[dir]);
}
/**
* A callback function type for searching tiles.
*
* @param tile The tile to test
* @param data additional data for the callback function to use
* @return A boolean value, depend on the definition of the function.
*/
typedef bool TestTileOnSearchProc(TileIndex tile, uint32 data);
/**
* Searches for some cirumstances of a tile around a given tile with a helper function.
*/
bool CircularTileSearch(TileIndex tile, uint size, TestTileOnSearchProc proc, uint32 data);
/* Approximation of the length of a straight track, relative to a diagonal
* track (ie the size of a tile side). #defined instead of const so it can
/** Approximation of the length of a straight track, relative to a diagonal
* track (ie the size of a tile side).
*
* #defined instead of const so it can
* stay integer. (no runtime float operations) Is this needed?
* Watch out! There are _no_ brackets around here, to prevent intermediate
* rounding! Be careful when using this!