Function SetupFarmFieldFence

src/industry_cmd.cpp:1024–1046

* Build farm field fence * @param tile the tile to position the fence on * @param size the size of the field being planted in tiles * @param type type of fence to set * @param side the side of the tile to attempt placement */

 * @param side the side of the tile to attempt placement
 */
static void SetupFarmFieldFence(TileIndex tile, int size, uint8_t type, DiagDirection side)
{
	TileIndexDiff diff = TileOffsByAxis(OtherAxis(DiagDirToAxis(side)));
	TileIndexDiff neighbour_diff = TileOffsByDiagDir(side);

	do {
		tile = Map::WrapToMap(tile);

		if (IsTileType(tile, MP_CLEAR) && IsClearGround(tile, CLEAR_FIELDS)) {
			TileIndex neighbour = tile + neighbour_diff;
			if (!IsTileType(neighbour, MP_CLEAR) || !IsClearGround(neighbour, CLEAR_FIELDS) || GetFence(neighbour, ReverseDiagDir(side)) == 0) {
				/* Add fence as long as neighbouring tile does not already have a fence in the same position. */
				uint8_t or_ = type;

				if (or_ == 1 && Chance16(1, 7)) or_ = 2;

				SetFence(tile, side, or_);
			}
		}

		tile += diff;
	} while (--size);
}

static void PlantFarmField(TileIndex tile, IndustryID industry)
{