Function IsTileAlignedToGrid

src/town_cmd.cpp:2316–2323

* Towns must all be placed on the same grid or when they eventually * interpenetrate their road networks will not mesh nicely; this * function tells you if a tile is properly aligned. * * @param tile The tile to start at. * @param layout The town layout in effect. * @return true if the tile is in the correct location. */

 * @return true if the tile is in the correct location.
 */
static bool IsTileAlignedToGrid(TileIndex tile, TownLayout layout)
{
	switch (layout) {
		case TL_2X2_GRID: return TileX(tile) % 3 == 0 && TileY(tile) % 3 == 0;
		case TL_3X3_GRID: return TileX(tile) % 4 == 0 && TileY(tile) % 4 == 0;
		default:          return true;
	}
}

/**
 * Given a spot on the map (presumed to be a water tile), find a good