ItemLadder.h

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#pragma once
 
#include "ItemHandler.h"
#include "Blocks/BlockLadder.h"
 
 
 
 
 
class cItemLadderHandler final  :
    public cItemHandler
{
    using Super = cItemHandler;
 
public:
 
    using Super::Super;
 
private:
 
    static NIBBLETYPE BlockFaceToMetaData(eBlockFace a_NeighborBlockFace)
    {
        switch (a_NeighborBlockFace)
        {
            case BLOCK_FACE_ZM: return 0x2;
            case BLOCK_FACE_ZP: return 0x3;
            case BLOCK_FACE_XM: return 0x4;
            case BLOCK_FACE_XP: return 0x5;
            case BLOCK_FACE_YM:
            case BLOCK_FACE_YP: return 0x2;
            default: UNREACHABLE("Unsupported neighbor block face");
        }
    }
 
 
    virtual bool CommitPlacement(cPlayer & a_Player, const cItem & a_HeldItem, const Vector3i a_PlacePosition, eBlockFace a_ClickedBlockFace, const Vector3i a_CursorPosition) const override
    {
        const auto & World = *a_Player.GetWorld();
        const auto ClickedBlockType = World.GetBlock(AddFaceDirection(a_PlacePosition, a_ClickedBlockFace, true));
 
        // Try finding a suitable neighbor block face for the ladder; start with the given one:
        if (!cBlockLadderHandler::CanBePlacedOn(ClickedBlockType, a_ClickedBlockFace))
        {
            // Couldn't be placed on whatever face was clicked, last ditch resort - find another face:
            a_ClickedBlockFace = FindSuitableFace(World, a_PlacePosition);
            if (a_ClickedBlockFace == BLOCK_FACE_NONE)
            {
                // No attachable face found - don't place the ladder:
                return false;
            }
        }
 
        return a_Player.PlaceBlock(a_PlacePosition, E_BLOCK_LADDER, BlockFaceToMetaData(a_ClickedBlockFace));
    }
 
 
    static eBlockFace FindSuitableFace(const cWorld & a_World, const Vector3i a_Position)
    {
        for (const auto Face : { BLOCK_FACE_ZM, BLOCK_FACE_XP, BLOCK_FACE_ZP, BLOCK_FACE_XM })  // Loop through all faces in specific order.
        {
            // The direction of Face is relative to the direction the ladder faces.
            // This is the position, computed inverted, that such a ladder would attach to.
            const auto NeighborPosition = AddFaceDirection(a_Position, Face, true);
 
            if (cBlockLadderHandler::CanBePlacedOn(a_World.GetBlock(NeighborPosition), Face))
            {
                return Face;
            }
        }
 
        return BLOCK_FACE_NONE;
    }
};