Method GetFoundationCells

src/Ext/Building/Body.cpp:412–454

Get all cells covered by the building, optionally including those covered by OccupyHeight.

// Get all cells covered by the building, optionally including those covered by OccupyHeight.
const std::vector<CellStruct> BuildingExt::GetFoundationCells(BuildingClass* const pThis, CellStruct const baseCoords, bool includeOccupyHeight)
{
	const CellStruct foundationEnd = { 0x7FFF, 0x7FFF };
	auto const pFoundation = pThis->GetFoundationData(false);

	int occupyHeight = includeOccupyHeight ? pThis->Type->OccupyHeight : 1;

	if (occupyHeight <= 0)
		occupyHeight = 1;

	auto pCellIterator = pFoundation;

	while (*pCellIterator != foundationEnd)
		++pCellIterator;

	std::vector<CellStruct> foundationCells;
	foundationCells.reserve(static_cast<int>(std::distance(pFoundation, pCellIterator + 1)) * occupyHeight);
	pCellIterator = pFoundation;

	while (*pCellIterator != foundationEnd)
	{
		auto actualCell = baseCoords + *pCellIterator;

		for (auto i = occupyHeight; i > 0; --i)
		{
			foundationCells.emplace_back(actualCell);
			--actualCell.X;
			--actualCell.Y;
		}
		++pCellIterator;
	}

	std::sort(foundationCells.begin(), foundationCells.end(),
		[](const CellStruct& lhs, const CellStruct& rhs) -> bool
	{
		return lhs.X > rhs.X || lhs.X == rhs.X && lhs.Y > rhs.Y;
	});

	auto const it = std::unique(foundationCells.begin(), foundationCells.end());
	foundationCells.erase(it, foundationCells.end());

	return foundationCells;
}

// =============================
// load / save