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#pragma once
#include "BlockPlant.h"
#include "../BlockInfo.h"
class cBlockCactusHandler :
public cClearMetaOnDrop<cBlockPlant<false>>
{
using Super = cClearMetaOnDrop<cBlockPlant<false>>;
public:
cBlockCactusHandler(BLOCKTYPE a_BlockType):
Super(a_BlockType)
{
}
/** Called before a cactus block is placed by a player, overrides cItemHandler::GetPlacementBlockTypeMeta().
Calls CanBeAt function to determine if a cactus block can be placed on a given block. */
bool GetPlacementBlockTypeMeta(
cChunkInterface & a_ChunkInterface,
cPlayer & a_Player,
const Vector3i a_PlacedBlockPos,
eBlockFace a_ClickedBlockFace,
const Vector3i a_CursorPos,
BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta
) override
{
if (
a_Player.GetWorld()->DoWithChunkAt(a_PlacedBlockPos,
[this, a_PlacedBlockPos, &a_ChunkInterface](cChunk & a_Chunk)
{
auto RelPos = cChunkDef::AbsoluteToRelative(a_PlacedBlockPos);
return CanBeAt(a_ChunkInterface, RelPos, a_Chunk);
}
))
{
a_BlockType = m_BlockType;
// Setting a_BlockMeta to meta copied from the lowest 4 bits of the player's equipped item's damage value.
NIBBLETYPE Meta = static_cast<NIBBLETYPE>(a_Player.GetEquippedItem().m_ItemDamage);
a_BlockMeta = Meta & 0x0f;
return true;
}
return false;
}
virtual bool CanBeAt(cChunkInterface & a_ChunkInterface, const Vector3i a_RelPos, const cChunk & a_Chunk) override
{
if (a_RelPos.y <= 0)
{
return false;
}
BLOCKTYPE Surface = a_Chunk.GetBlock(a_RelPos.addedY(-1));
if ((Surface != E_BLOCK_SAND) && (Surface != E_BLOCK_CACTUS))
{
// Cactus can only be placed on sand and itself
return false;
}
// Check surroundings. Cacti may ONLY be surrounded by non-solid blocks
static const Vector3i Coords[] =
{
{-1, 0, 0},
{ 1, 0, 0},
{ 0, 0, -1},
{ 0, 0, 1},
};
for (size_t i = 0; i < ARRAYCOUNT(Coords); i++)
{
BLOCKTYPE BlockType;
NIBBLETYPE BlockMeta;
if (
a_Chunk.UnboundedRelGetBlock(a_RelPos + Coords[i], BlockType, BlockMeta) &&
(
cBlockInfo::IsSolid(BlockType) ||
(BlockType == E_BLOCK_LAVA) ||
(BlockType == E_BLOCK_STATIONARY_LAVA)
)
)
{
return false;
}
} // for i - Coords[]
return true;
}
virtual ColourID GetMapBaseColourID(NIBBLETYPE a_Meta) override
{
UNUSED(a_Meta);
return 7;
}
virtual int Grow(cChunk & a_Chunk, Vector3i a_RelPos, int a_NumStages = 1) override
{
// Check the total height of the cacti blocks here:
int top = a_RelPos.y + 1;
while (
(top < cChunkDef::Height) &&
(a_Chunk.GetBlock({a_RelPos.x, top, a_RelPos.z}) == E_BLOCK_CACTUS)
)
{
++top;
}
int bottom = a_RelPos.y - 1;
while (
(bottom > 0) &&
(a_Chunk.GetBlock({a_RelPos.x, bottom, a_RelPos.z}) == E_BLOCK_CACTUS)
)
{
--bottom;
}
// Refuse if already too high:
auto numToGrow = std::min(a_NumStages, a_Chunk.GetWorld()->GetMaxCactusHeight() + 1 - (top - bottom));
if (numToGrow <= 0)
{
return 0;
}
BLOCKTYPE blockType;
for (int i = 0; i < numToGrow; ++i)
{
Vector3i pos(a_RelPos.x, top + i, a_RelPos.z);
if (!a_Chunk.UnboundedRelGetBlockType(pos, blockType) || (blockType != E_BLOCK_AIR))
{
// Cannot grow there
return i;
}
a_Chunk.UnboundedRelFastSetBlock(pos, E_BLOCK_CACTUS, 0);
// Check surroundings. Cacti may ONLY be surrounded by non-solid blocks; if they aren't, drop as pickup and bail out the growing
static const Vector3i neighborOffsets[] =
{
{-1, 0, 0},
{ 1, 0, 0},
{ 0, 0, -1},
{ 0, 0, 1},
} ;
for (const auto & ofs: neighborOffsets)
{
if (
a_Chunk.UnboundedRelGetBlockType(pos + ofs, blockType) &&
(
cBlockInfo::IsSolid(blockType) ||
(blockType == E_BLOCK_LAVA) ||
(blockType == E_BLOCK_STATIONARY_LAVA)
)
)
{
// Remove the cactus
auto absPos = a_Chunk.RelativeToAbsolute(pos);
a_Chunk.GetWorld()->DropBlockAsPickups(absPos);
return i + 1;
}
} // for neighbor
} // for i - numToGrow
return numToGrow;
}
protected:
virtual PlantAction CanGrow(cChunk & a_Chunk, Vector3i a_RelPos) override
{
// Only allow growing if there's an air block above:
if (((a_RelPos.y + 1) < cChunkDef::Height) && (a_Chunk.GetBlock(a_RelPos.addedY(1)) == E_BLOCK_AIR))
{
return Super::CanGrow(a_Chunk, a_RelPos);
}
return paStay;
}
} ;
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