Function AddTileIndexDiffCWrap

src/map_func.h:528–535

* Add a TileIndexDiffC to a TileIndex and returns the new one. * * Returns tile + the diff given in diff. If the result tile would end up * outside of the map, INVALID_TILE is returned instead. * * @param tile The base tile to add the offset on * @param diff The offset to add on the tile * @return The resulting TileIndex */

 * @return The resulting TileIndex
 */
inline TileIndex AddTileIndexDiffCWrap(TileIndex tile, TileIndexDiffC diff)
{
	int x = TileX(tile) + diff.x;
	int y = TileY(tile) + diff.y;
	/* Negative value will become big positive value after cast */
	if ((uint)x >= Map::SizeX() || (uint)y >= Map::SizeY()) return INVALID_TILE;
	return TileXY(x, y);
}

/**
 * Returns the diff between two tiles