168 lines
3.5 KiB
C++
168 lines
3.5 KiB
C++
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#pragma once
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#include "BlockHandler.h"
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class cBlockSnowHandler :
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public cBlockHandler
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{
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using Super = cBlockHandler;
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public:
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using Super::Super;
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private:
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enum
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{
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FullBlockMeta = 7 // Meta value of a full-height snow block
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};
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virtual bool GetPlacementBlockTypeMeta(
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cChunkInterface & a_ChunkInterface,
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cPlayer & a_Player,
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const Vector3i a_PlacedBlockPos,
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eBlockFace a_ClickedBlockFace,
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const Vector3i a_CursorPos,
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BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta
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) const override
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{
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a_BlockType = m_BlockType;
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// Check if incrementing existing snow height:
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BLOCKTYPE BlockBeforePlacement;
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NIBBLETYPE MetaBeforePlacement;
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a_ChunkInterface.GetBlockTypeMeta(a_PlacedBlockPos, BlockBeforePlacement, MetaBeforePlacement);
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if ((BlockBeforePlacement == E_BLOCK_SNOW) && (MetaBeforePlacement < FullBlockMeta))
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{
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// Only increment if:
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// - A snow block was already there (not first time placement) AND
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// - Height is smaller than the maximum possible
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a_BlockMeta = MetaBeforePlacement + 1;
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return true;
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}
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// First time placement, check placement is valid
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a_BlockMeta = 0;
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BLOCKTYPE BlockBelow;
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NIBBLETYPE MetaBelow;
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return (
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(a_PlacedBlockPos.y > 0) &&
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a_ChunkInterface.GetBlockTypeMeta(a_PlacedBlockPos.addedY(-1), BlockBelow, MetaBelow) &&
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CanBeOn(BlockBelow, MetaBelow)
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);
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}
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virtual bool DoesIgnoreBuildCollision(cChunkInterface & a_ChunkInterface, Vector3i a_Pos, cPlayer & a_Player, NIBBLETYPE a_Meta) const override
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{
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if ((a_Player.GetEquippedItem().m_ItemType == E_BLOCK_SNOW) && (a_Meta < FullBlockMeta))
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{
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return true; // If a player is holding a (thin) snow block and it's size can be increased, return collision ignored
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}
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if (a_Meta == 0)
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{
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return true; // If at normal snowfall height (lowest), we ignore collision
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}
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return false;
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}
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virtual cItems ConvertToPickups(NIBBLETYPE a_BlockMeta, cBlockEntity * a_BlockEntity, const cEntity * a_Digger, const cItem * a_Tool) const override
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{
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// No drop unless dug up with a shovel
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if ((a_Tool == nullptr) || !ItemCategory::IsShovel(a_Tool->m_ItemType))
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{
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return {};
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}
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if (ToolHasSilkTouch(a_Tool))
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{
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return cItem(m_BlockType, 1, 0);
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}
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else
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{
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// Drop as many snowballs as there were "layers" of snow:
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return cItem(E_ITEM_SNOWBALL, 1 + (a_BlockMeta & 0x07), 0);
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}
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}
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virtual bool CanBeAt(cChunkInterface & a_ChunkInterface, const Vector3i a_RelPos, const cChunk & a_Chunk) const override
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{
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if (a_RelPos.y <= 0)
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{
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return false;
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}
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auto BelowPos = a_RelPos.addedY(-1);
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auto BlockBelow = a_Chunk.GetBlock(BelowPos);
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auto MetaBelow = a_Chunk.GetMeta(BelowPos);
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return CanBeOn(BlockBelow, MetaBelow);
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}
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virtual bool DoesDropOnUnsuitable(void) const override
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{
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return false;
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}
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virtual ColourID GetMapBaseColourID(NIBBLETYPE a_Meta) const override
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{
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UNUSED(a_Meta);
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return 14;
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}
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virtual bool IsInsideBlock(const Vector3d a_RelPosition, const NIBBLETYPE a_BlockMeta) const override
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{
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return a_RelPosition.y < (cBlockInfo::GetBlockHeight(m_BlockType) * (a_BlockMeta & 0x07));
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}
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private:
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/** Returns true if snow can be placed on top of a block with the given type and meta. */
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static bool CanBeOn(BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta)
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{
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// If block below is snowable, or it is a thin slow block and is a full thin snow block, say yay
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return (
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cBlockInfo::IsSnowable(a_BlockType) ||
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(
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(a_BlockType == E_BLOCK_SNOW) &&
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(a_BlockMeta == FullBlockMeta)
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)
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);
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}
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} ;
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