Function IsSuitableForFarmField

src/industry_cmd.cpp:1001–1015

* Check whether the tile can be replaced by a farm field. * @param tile The tile to investigate. * @param allow_fields Can we replace an existing field? * @param allow_rough Can we build on rough tiles? (clear or trees) * @return true if the tile can become a farm field */

 * @return true if the tile can become a farm field
 */
static bool IsSuitableForFarmField(TileIndex tile, bool allow_fields, bool allow_rough)
{
	switch (GetTileType(tile)) {
		case MP_CLEAR:
			if (IsSnowTile(tile)) return false;
			switch (GetClearGround(tile)) {
				case CLEAR_DESERT: return false;
				case CLEAR_ROUGH: return allow_rough;
				case CLEAR_FIELDS: return allow_fields;
				default: return true;
			}
		case MP_TREES: return GetTreeGround(tile) != TREE_GROUND_SHORE && (allow_rough || GetTreeGround(tile) != TREE_GROUND_ROUGH);
		default:       return false;
	}
}

/**
 * Build farm field fence