1 files changed, 167 insertions, 0 deletions

diff --git a/src/Items/ItemChest.h b/src/Items/ItemChest.h
new file mode 100644
index 000000000..b6579c423
--- /dev/null
+++ b/src/Items/ItemChest.h
@@ -0,0 +1,167 @@
+
+// ItemChest.h
+
+// Declares the cItemChestHandler class representing the cItemHandler descendant responsible for chests
+
+
+
+
+
+#pragma once
+
+#include "ItemHandler.h"
+#include "../Blocks/BlockChest.h"
+
+
+
+
+
+class cItemChestHandler:
+	public cItemHandler
+{
+	typedef cItemHandler super;
+public:
+	cItemChestHandler(int a_ItemType):
+		super(a_ItemType)
+	{
+	}
+
+
+	virtual bool OnPlayerPlace(
+		cWorld & a_World, cPlayer & a_Player, const cItem & a_EquippedItem,
+		int a_BlockX, int a_BlockY, int a_BlockZ, eBlockFace a_BlockFace,
+		int a_CursorX, int a_CursorY, int a_CursorZ
+	) override
+	{
+		if (a_BlockFace < 0)
+		{
+			// Clicked in air
+			return false;
+		}
+	
+		if ((a_BlockY < 0) || (a_BlockY >= cChunkDef::Height))
+		{
+			// The clicked block is outside the world, ignore this call altogether (#128)
+			return false;
+		}
+
+		// Check if the block ignores build collision (water, grass etc.):
+		BLOCKTYPE ClickedBlock;
+		NIBBLETYPE ClickedBlockMeta;
+		a_World.GetBlockTypeMeta(a_BlockX, a_BlockY, a_BlockZ, ClickedBlock, ClickedBlockMeta);
+		if (
+			BlockHandler(ClickedBlock)->DoesIgnoreBuildCollision() ||
+			BlockHandler(ClickedBlock)->DoesIgnoreBuildCollision(&a_Player, ClickedBlockMeta)
+		)
+		{
+			cChunkInterface ChunkInterface(a_World.GetChunkMap());
+			BlockHandler(ClickedBlock)->OnDestroyedByPlayer(ChunkInterface, a_World, &a_Player, a_BlockX, a_BlockY, a_BlockZ);
+		}
+		else
+		{
+			AddFaceDirection(a_BlockX, a_BlockY, a_BlockZ, a_BlockFace);
+			
+			if ((a_BlockY < 0) || (a_BlockY >= cChunkDef::Height))
+			{
+				// The block is being placed outside the world, ignore this packet altogether (#128)
+				return false;
+			}
+			
+			NIBBLETYPE PlaceMeta;
+			BLOCKTYPE PlaceBlock;
+			a_World.GetBlockTypeMeta(a_BlockX, a_BlockY, a_BlockZ, PlaceBlock, PlaceMeta);
+
+			// Clicked on side of block, make sure that placement won't be cancelled if there is a slab able to be double slabbed.
+			// No need to do combinability (dblslab) checks, client will do that here.
+			if (
+				!BlockHandler(PlaceBlock)->DoesIgnoreBuildCollision() &&
+				!BlockHandler(PlaceBlock)->DoesIgnoreBuildCollision(&a_Player, PlaceMeta)
+			)
+			{
+				// Tried to place a block *into* another?
+				// Happens when you place a block aiming at side of block with a torch on it or stem beside it
+				return false;
+			}
+		}
+
+		// Check that there is at most one single neighbor of the same chest type:
+		static const Vector3i CrossCoords[] =
+		{
+			{-1, 0,  0},
+			{ 0, 0, -1},
+			{ 1, 0,  0},
+			{ 0, 0,  1},
+		};
+		int NeighborIdx = -1;
+		for (size_t i = 0; i < ARRAYCOUNT(CrossCoords); i++)
+		{
+			if (a_World.GetBlock(a_BlockX + CrossCoords[i].x, a_BlockY, a_BlockZ + CrossCoords[i].z) != m_ItemType)
+			{
+				continue;
+			}
+			if (NeighborIdx >= 0)
+			{
+				// Can't place here, there are already two neighbors, this would form a 3-block chest
+				return false;
+			}
+			NeighborIdx = static_cast<int>(i);
+
+			// Check that this neighbor is a single chest:
+			int bx = a_BlockX + CrossCoords[i].x;
+			int bz = a_BlockZ + CrossCoords[i].z;
+			for (size_t j = 0; j < ARRAYCOUNT(CrossCoords); j++)
+			{
+				if (a_World.GetBlock(bx + CrossCoords[j].x, a_BlockY, bz + CrossCoords[j].z) == m_ItemType)
+				{
+					return false;
+				}
+			}  // for j
+		}  // for i
+
+		// If there's no chest neighbor, place the single block chest and bail out:
+		BLOCKTYPE ChestBlockType = static_cast<BLOCKTYPE>(m_ItemType);
+		if (NeighborIdx < 0)
+		{
+			NIBBLETYPE Meta = cBlockChestHandler::PlayerYawToMetaData(a_Player.GetYaw());
+			return a_Player.PlaceBlock(a_BlockX, a_BlockY, a_BlockZ, ChestBlockType, Meta);
+		}
+
+		// There is a neighbor to which we need to adjust
+		double yaw = a_Player.GetYaw();
+		if ((NeighborIdx == 0) || (NeighborIdx == 2))
+		{
+			// The neighbor is in the X axis, form a X-axis-aligned dblchest:
+			NIBBLETYPE Meta = ((yaw >= -90) && (yaw < 90)) ? E_META_CHEST_FACING_ZM : E_META_CHEST_FACING_ZP;
+
+			// Place the new chest:
+			if (!a_Player.PlaceBlock(a_BlockX, a_BlockY, a_BlockZ, ChestBlockType, Meta))
+			{
+				return false;
+			}
+
+			// Adjust the existing chest:
+			a_World.FastSetBlock(a_BlockX + CrossCoords[NeighborIdx].x, a_BlockY, a_BlockZ + CrossCoords[NeighborIdx].z, ChestBlockType, Meta);
+			return true;
+		}
+
+		// The neighbor is in the Z axis, form a Z-axis-aligned dblchest:
+		NIBBLETYPE Meta = (yaw < 0) ? E_META_CHEST_FACING_XM : E_META_CHEST_FACING_XP;
+
+		// Place the new chest:
+		if (!a_Player.PlaceBlock(a_BlockX, a_BlockY, a_BlockZ, ChestBlockType, Meta))
+		{
+			return false;
+		}
+
+		// Adjust the existing chest:
+		a_World.FastSetBlock(a_BlockX + CrossCoords[NeighborIdx].x, a_BlockY, a_BlockZ + CrossCoords[NeighborIdx].z, ChestBlockType, Meta);
+		return true;
+	}
+
+private:
+	cItemChestHandler(const cItemChestHandler &) = delete;
+};
+
+
+
+