Method HandlePlaceBlock

src/ClientHandle.cpp:1029–1153

void cClientHandle::HandlePlaceBlock(int a_BlockX, int a_BlockY, int a_BlockZ, eBlockFace a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ, cItemHandler & a_ItemHandler)
{
	BLOCKTYPE EquippedBlock = (BLOCKTYPE)(m_Player->GetEquippedItem().m_ItemType);
	if (a_BlockFace < 0)
	{
		// Clicked in air
		return;
	}
	
	cWorld * World = m_Player->GetWorld();

	BLOCKTYPE ClickedBlock;
	NIBBLETYPE ClickedBlockMeta;
	NIBBLETYPE EquippedBlockDamage = (NIBBLETYPE)(m_Player->GetEquippedItem().m_ItemDamage);

	if ((a_BlockY < 0) || (a_BlockY >= cChunkDef::Height))
	{
		// The block is being placed outside the world, ignore this packet altogether (#128)
		return;
	}
	
	World->GetBlockTypeMeta(a_BlockX, a_BlockY, a_BlockZ, ClickedBlock, ClickedBlockMeta);

	// Special slab handling - placing a slab onto another slab produces a dblslab instead:
	if (
		cBlockSlabHandler::IsAnySlabType(ClickedBlock) &&               // Is there a slab already?
		cBlockSlabHandler::IsAnySlabType(EquippedBlock) &&              // Is the player placing another slab?
		((ClickedBlockMeta & 0x07) == EquippedBlockDamage) &&           // Is it the same slab type?
		(
			(a_BlockFace == BLOCK_FACE_TOP) ||                          // Clicking the top of a bottom slab
			(a_BlockFace == BLOCK_FACE_BOTTOM)                          // Clicking the bottom of a top slab
		)
	)
	{
		// Coordinates at clicked block, which was an eligible slab, and either top or bottom faces were clicked
		// If clicked top face and slab occupies the top voxel, we want a slab to be placed above it (therefore increment Y)
		// Else if clicked bottom face and slab occupies the bottom voxel, decrement Y for the same reason
		// Don't touch coordinates if anything else because a dblslab opportunity is present
		if ((ClickedBlockMeta & 0x08) && (a_BlockFace == BLOCK_FACE_TOP))
		{
			++a_BlockY;
		}
		else if (!(ClickedBlockMeta & 0x08) && (a_BlockFace == BLOCK_FACE_BOTTOM))
		{
			--a_BlockY;
		}
		World->GetBlockTypeMeta(a_BlockX, a_BlockY, a_BlockZ, ClickedBlock, ClickedBlockMeta);
	}
	else
	{
		// Check if the block ignores build collision (water, grass etc.):
		if (
			BlockHandler(ClickedBlock)->DoesIgnoreBuildCollision() ||
			BlockHandler(ClickedBlock)->DoesIgnoreBuildCollision(m_Player, ClickedBlockMeta)
			)
		{
			cChunkInterface ChunkInterface(World->GetChunkMap());
			BlockHandler(ClickedBlock)->OnDestroyedByPlayer(ChunkInterface, *World, m_Player, a_BlockX, a_BlockY, a_BlockZ);