ItemBoat.h

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#pragma once

#include "../Entities/Boat.h"
#include "../LineBlockTracer.h"





class cItemBoatHandler :
    public cItemHandler
{
    typedef cItemHandler super;

public:
    cItemBoatHandler(int a_ItemType) :
        super(a_ItemType)
    {
    }



    virtual bool OnItemUse(
        cWorld * a_World, cPlayer * a_Player, cBlockPluginInterface & a_PluginInterface, const cItem & a_Item,
        int a_BlockX, int a_BlockY, int a_BlockZ, eBlockFace a_BlockFace
    ) override
    {
        if ((a_BlockFace != BLOCK_FACE_YM) && (a_BlockFace != BLOCK_FACE_NONE))
        {
            return false;
        }

        class cCallbacks :
            public cBlockTracer::cCallbacks
        {
        public:
            Vector3d m_Pos;
            bool m_HasFound;

            cCallbacks(void) :
                m_HasFound(false)
            {
            }

            virtual bool OnNextBlock(int a_CBBlockX, int a_CBBlockY, int a_CBBlockZ, BLOCKTYPE a_CBBlockType, NIBBLETYPE a_CBBlockMeta, eBlockFace a_CBEntryFace) override
            {
                if (a_CBBlockType != E_BLOCK_AIR)
                {
                    m_Pos.Set(a_CBBlockX, a_CBBlockY, a_CBBlockZ);
                    m_HasFound = true;
                    return true;
                }
                return false;
            }
        } Callbacks;

        cLineBlockTracer Tracer(*a_World, Callbacks);
        Vector3d Start(a_Player->GetEyePosition() + a_Player->GetLookVector());
        Vector3d End(a_Player->GetEyePosition() + a_Player->GetLookVector() * 5);

        Tracer.Trace(Start.x, Start.y, Start.z, End.x, End.y, End.z);

        if (!Callbacks.m_HasFound)
        {
            return false;
        }

        auto x = Callbacks.m_Pos.x;
        auto y = Callbacks.m_Pos.y;
        auto z = Callbacks.m_Pos.z;
        auto bx = FloorC(x);
        auto by = FloorC(y);
        auto bz = FloorC(z);

        // Verify that block type for spawn point is water
        BLOCKTYPE SpawnBlock = a_World->GetBlock(bx, by, bz);
        if (!IsBlockWater(SpawnBlock))
        {
            return false;
        }

        // Block above must be air to spawn a boat (prevents spawning a boat underwater)
        BLOCKTYPE BlockAbove = a_World->GetBlock(bx, by + 1, bz);
        if (BlockAbove != E_BLOCK_AIR)
        {
            return false;
        }

        // Spawn block at water level
        if (a_World->SpawnBoat(Callbacks.m_Pos + Vector3d(0.5, 0.5, 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;
    }
} ;