diff options
Diffstat (limited to 'map.h')
| -rw-r--r-- | map.h | 22 |
1 files changed, 21 insertions, 1 deletions
@@ -35,7 +35,9 @@ uint ScaleByMapSize(uint); // Scale relative to the number of tiles uint ScaleByMapSize1D(uint); // Scale relative to the circumference of the map typedef uint32 TileIndex; - +enum { + INVALID_TILE = (uint32) -1 +}; static inline uint TileX(TileIndex tile) { @@ -71,6 +73,24 @@ static inline TileIndexDiff ToTileIndexDiff(TileIndexDiffC tidc) #define TILE_ADDXY(tile, x, y) TILE_ADD(tile, TILE_XY(x, y)) +uint TileAddWrap(TileIndex tile, int addx, int addy); + +static inline TileIndexDiffC TileIndexDiffCByDir(uint dir) { + extern const TileIndexDiffC _tileoffs_by_dir[4]; + return _tileoffs_by_dir[dir]; +} + +/* Returns tile + the diff given in diff. If the result tile would end up + * outside of the map, INVALID_TILE is returned instead. + */ +static inline TileIndex AddTileIndexDiffCWrap(TileIndex tile, TileIndexDiffC diff) { + int x = TileX(tile) + diff.x; + int y = TileY(tile) + diff.y; + if (x < 0 || y < 0 || x > (int)MapMaxX() || y > (int)MapMaxY()) + return INVALID_TILE; + else + return TILE_XY(x, y); +} // Functions to calculate distances uint DistanceManhattan(TileIndex, TileIndex); // also known as L1-Norm |