diff options
Diffstat (limited to 'map.c')
| -rw-r--r-- | map.c | 33 |
1 files changed, 26 insertions, 7 deletions
@@ -108,6 +108,32 @@ uint ScaleByMapSize1D(uint n) } +// This function checks if we add addx/addy to tile, if we +// do wrap around the edges. For example, tile = (10,2) and +// addx = +3 and addy = -4. This function will now return +// INVALID_TILE, because the y is wrapped. This is needed in +// for example, farmland. When the tile is not wrapped, +// the result will be tile + TILE_XY(addx, addy) +uint TileAddWrap(TileIndex tile, int addx, int addy) +{ + uint x, y; + x = TileX(tile) + addx; + y = TileY(tile) + addy; + + // Are we about to wrap? + if (x < MapMaxX() && y < MapMaxY()) + return tile + TILE_XY(addx, addy); + + return INVALID_TILE; +} + +const TileIndexDiffC _tileoffs_by_dir[] = { + {-1, 0}, + { 0, 1}, + { 1, 0}, + { 0, -1} +}; + uint DistanceManhattan(TileIndex t0, TileIndex t1) { return @@ -151,10 +177,3 @@ uint DistanceFromEdge(TileIndex tile) return minl < minh ? minl : minh; } - -const TileIndexDiffC _tileoffs_by_dir[] = { - {-1, 0}, - { 0, 1}, - { 1, 0}, - { 0, -1} -}; |