Function GetRandomTreeType

src/tree_cmd.cpp:130–149

* Get a random TreeType for the given tile based on a given seed * * This function returns a random TreeType which can be placed on the given tile. * The seed for randomness must be less or equal 256, use #GB on the value of Random() * to get such a value. * * @param tile The tile to get a random TreeType from * @param seed The seed for randomness, must be less or equal 256 * @return The r

 * @return The random tree type
 */
static TreeType GetRandomTreeType(TileIndex tile, uint seed)
{
	switch (_settings_game.game_creation.landscape) {
		case LandscapeType::Temperate:
			return static_cast<TreeType>(seed * TREE_COUNT_TEMPERATE / 256 + TREE_TEMPERATE);

		case LandscapeType::Arctic:
			return static_cast<TreeType>(seed * TREE_COUNT_SUB_ARCTIC / 256 + TREE_SUB_ARCTIC);

		case LandscapeType::Tropic:
			switch (GetTropicZone(tile)) {
				case TROPICZONE_NORMAL:  return static_cast<TreeType>(seed * TREE_COUNT_SUB_TROPICAL / 256 + TREE_SUB_TROPICAL);
				case TROPICZONE_DESERT:  return static_cast<TreeType>((seed > 12) ? TREE_INVALID : TREE_CACTUS);
				default:                 return static_cast<TreeType>(seed * TREE_COUNT_RAINFOREST / 256 + TREE_RAINFOREST);
			}

		default:
			return static_cast<TreeType>(seed * TREE_COUNT_TOYLAND / 256 + TREE_TOYLAND);
	}
}

/**
 * Make a random tree tile of the given tile