Function GetTileSlopeZ

src/tile_map.cpp:55–68

* Return the slope of a given tile inside the map. * @param tile Tile to compute slope of * @return Slope of the tile, except for the HALFTILE part, and the z height */

 * @return Slope of the tile, except for the HALFTILE part, and the z height
 */
std::tuple<Slope, int> GetTileSlopeZ(TileIndex tile)
{
	uint x1 = TileX(tile);
	uint y1 = TileY(tile);
	uint x2 = std::min(x1 + 1, Map::MaxX());
	uint y2 = std::min(y1 + 1, Map::MaxY());

	int hnorth = TileHeight(tile);           // Height of the North corner.
	int hwest  = TileHeight(TileXY(x2, y1)); // Height of the West corner.
	int heast  = TileHeight(TileXY(x1, y2)); // Height of the East corner.
	int hsouth = TileHeight(TileXY(x2, y2)); // Height of the South corner.

	return GetTileSlopeGivenHeight(hnorth, hwest, heast, hsouth);
}

/**
 * Return the slope of a given tile, also for tiles outside the map (virtual "black" tiles).