ItemChest.h

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#pragma once
 
#include "ItemHandler.h"
#include "Blocks/BlockChest.h"
 
 
 
 
 
class cItemChestHandler final :
    public cItemHandler
{
    using Super = cItemHandler;
 
public:
 
    using Super::Super;
 
    cItemChestHandler(const cItemChestHandler &) = delete;
 
private:
 
    virtual bool CommitPlacement(cPlayer & a_Player, const cItem & a_HeldItem, const Vector3i a_PlacePosition, const eBlockFace a_ClickedBlockFace, const Vector3i a_CursorPosition) const override
    {
        // 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},
        };
 
        auto & World = *a_Player.GetWorld();
        int NeighborIdx = -1;
 
        for (size_t i = 0; i < ARRAYCOUNT(CrossCoords); i++)
        {
            const auto NeighborPos = a_PlacePosition + CrossCoords[i];
            if (World.GetBlock(NeighborPos) != 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:
            for (size_t j = 0; j < ARRAYCOUNT(CrossCoords); j++)
            {
                if (World.GetBlock(NeighborPos + CrossCoords[j]) == m_ItemType)
                {
                    // Trying to place next to a dblchest
                    return false;
                }
            }  // for j
        }  // for i
 
        // Get the meta of the placed chest; take existing neighbors into account:
        BLOCKTYPE ChestBlockType = static_cast<BLOCKTYPE>(m_ItemType);
        NIBBLETYPE Meta;
        const auto yaw = a_Player.GetYaw();
        switch (NeighborIdx)
        {
            case 0:
            case 2:
            {
                // The neighbor is in the X axis, form a X-axis-aligned dblchest:
                Meta = ((yaw >= -90) && (yaw < 90)) ? E_META_CHEST_FACING_ZM : E_META_CHEST_FACING_ZP;
                break;
            }
            case 1:
            case 3:
            {
                // The neighbor is in the Z axis, form a Z-axis-aligned dblchest:
                Meta = (yaw < 0) ? E_META_CHEST_FACING_XM : E_META_CHEST_FACING_XP;
                break;
            }
            default:
            {
                // No neighbor, place based on yaw:
                Meta = cBlockChestHandler::YawToMetaData(yaw);
                break;
            }
        }  // switch (NeighborIdx)
 
        // Place the new chest:
        if (!a_Player.PlaceBlock(a_PlacePosition, ChestBlockType, Meta))
        {
            return false;
        }
 
        // Adjust the existing chest, if any:
        if (NeighborIdx != -1)
        {
            World.FastSetBlock(a_PlacePosition + CrossCoords[NeighborIdx], ChestBlockType, Meta);
        }
 
        return true;
    }
};