ItemEndCrystal.h

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#pragma once
 
#include "ItemHandler.h"
#include "../World.h"
#include "../Entities/Player.h"
 
 
 
 
 
class cItemEndCrystalHandler final :
    public cItemHandler
{
    using Super = cItemHandler;
 
public:
 
    constexpr cItemEndCrystalHandler(int a_ItemType) :
        Super(a_ItemType)
    {
    }
 
 
    virtual bool OnItemUse(
        cWorld * a_World, cPlayer * a_Player,
        cBlockPluginInterface & a_PluginInterface, const cItem & a_HeldItem,
        const Vector3i a_BlockPos,
        eBlockFace a_ClickedBlockFace) const override
    {
        // Must click a valid block:
        if (a_ClickedBlockFace < 0)
        {
            return false;
        }
 
        if (
            const auto BlockType = a_World->GetBlock(a_BlockPos);
 
            // Don't place if placement block is not obsidian or bedrock:
            (BlockType != E_BLOCK_OBSIDIAN) && (BlockType != E_BLOCK_BEDROCK)
        )
        {
            return false;
        }
 
        // The position of the block above the placement block.
        const auto Above = a_BlockPos.addedY(1);
 
        if (
            // Don't place if two blocks above placement block aren't air:
            ((Above.y != cChunkDef::Height) && (a_World->GetBlock(Above) != E_BLOCK_AIR)) ||
            ((Above.y < (cChunkDef::Height - 1)) && (a_World->GetBlock(Above.addedY(1)) != E_BLOCK_AIR)) ||
 
            // Refuse placement if there are any entities in a (1 by 2 by 1) bounding box with base at the block above:
            !a_World->ForEachEntityInBox(
                { Above, Above + Vector3i(1, 2, 1) },
                [](cEntity & a_Entity)
                {
                    return true;
                }
            )
        )
        {
            return false;
        }
 
        // Spawns ender crystal entity, aborts if plugin cancelled:
        if (a_World->SpawnEnderCrystal(Vector3d(0.5, 0, 0.5) + Above, false) == cEntity::INVALID_ID)
        {
            return false;
        }
 
        if (!a_Player->IsGameModeCreative())
        {
            a_Player->GetInventory().RemoveOneEquippedItem();
        }
 
        return true;
    }
};