ItemBoat.h

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#pragma once
 
#include "../Entities/Boat.h"
#include "../LineBlockTracer.h"
 
 
 
 
 
class cItemBoatHandler final:
    public cItemHandler
{
    using Super = cItemHandler;
 
public:
 
    using Super::Super;
 
 
 
 
 
    virtual bool OnItemUse(
        cWorld * a_World,
        cPlayer * a_Player,
        cBlockPluginInterface & a_PluginInterface,
        const cItem & a_HeldItem,
        const Vector3i a_ClickedBlockPos,
        eBlockFace a_ClickedBlockFace
    ) const override
    {
        // Only allow placing blocks on top of blocks, or when not in range of dest block:
        if ((a_ClickedBlockFace != BLOCK_FACE_YM) && (a_ClickedBlockFace != BLOCK_FACE_NONE))
        {
            return false;
        }
 
        // Find the actual placement position by tracing line of sight until non-air block:
        class cCallbacks:
            public cBlockTracer::cCallbacks
        {
        public:
            Vector3d m_Pos;
            bool m_HasFound;
 
            cCallbacks():
                m_HasFound(false)
            {
            }
 
            virtual bool OnNextBlock(Vector3i a_CBBlockPos, BLOCKTYPE a_CBBlockType, NIBBLETYPE a_CBBlockMeta, eBlockFace a_CBEntryFace) override
            {
                if (a_CBBlockType != E_BLOCK_AIR)
                {
                    m_Pos = a_CBBlockPos;
                    m_HasFound = true;
                    return true;
                }
                return false;
            }
        } Callbacks;
        auto Start = a_Player->GetEyePosition() + a_Player->GetLookVector();
        auto End = a_Player->GetEyePosition() + a_Player->GetLookVector() * 5;
        cLineBlockTracer::Trace(*a_World, Callbacks, Start, End);
        if (!Callbacks.m_HasFound)
        {
            return false;
        }
 
        // Block above must be air to spawn a boat (prevents spawning a boat underwater)
        auto PosAbove = Callbacks.m_Pos.Floor().addedY(1);
        if (!cChunkDef::IsValidHeight(PosAbove))
        {
            return false;
        }
        BLOCKTYPE BlockAbove = a_World->GetBlock(PosAbove);
        if (BlockAbove != E_BLOCK_AIR)
        {
            return false;
        }
 
        // Spawn block at water level
        if (a_World->SpawnBoat(Callbacks.m_Pos + Vector3d(0.5, 1, 0.5), cBoat::ItemToMaterial(a_Player->GetEquippedItem())) == cEntity::INVALID_ID)
        {
            return false;
        }
 
        // Remove boat from players hand
        if (!a_Player->IsGameModeCreative())
        {
            a_Player->GetInventory().RemoveOneEquippedItem();
        }
 
        return true;
    }
} ;