335 lines
8.6 KiB
C++
335 lines
8.6 KiB
C++
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#pragma once
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#include "ItemHandler.h"
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#include "../World.h"
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#include "../BlockEntities/MobHeadEntity.h"
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class cItemMobHeadHandler:
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public cItemHandler
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{
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using Super = cItemHandler;
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public:
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cItemMobHeadHandler(int a_ItemType):
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Super(a_ItemType)
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{
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}
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virtual bool CommitPlacement(cPlayer & a_Player, const cItem & a_HeldItem, const Vector3i a_PlacePosition, const eBlockFace a_ClickedBlockFace, const Vector3i a_CursorPosition) override
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{
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// Cannot place a head at "no face" and from the bottom:
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if ((a_ClickedBlockFace == BLOCK_FACE_NONE) || (a_ClickedBlockFace == BLOCK_FACE_BOTTOM))
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{
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return false;
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}
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// If the placed head is a wither, try to spawn the wither first:
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if (a_HeldItem.m_ItemDamage == E_META_HEAD_WITHER)
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{
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if (TrySpawnWitherAround(a_Player, a_PlacePosition))
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{
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return true;
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}
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// Wither not created, proceed with regular head placement
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}
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if (!a_Player.PlaceBlock(a_PlacePosition, E_BLOCK_HEAD, BlockFaceToBlockMeta(a_ClickedBlockFace)))
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{
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return false;
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}
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RegularHeadPlaced(a_Player, a_HeldItem, a_PlacePosition, a_ClickedBlockFace);
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return true;
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}
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/** Called after placing a regular head block with no mob spawning.
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Adjusts the mob head entity based on the equipped item's data. */
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void RegularHeadPlaced(const cPlayer & a_Player, const cItem & a_HeldItem, const Vector3i a_PlacePosition, const eBlockFace a_ClickedBlockFace)
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{
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const auto HeadType = static_cast<eMobHeadType>(a_HeldItem.m_ItemDamage);
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const auto BlockMeta = static_cast<NIBBLETYPE>(a_ClickedBlockFace);
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// Use a callback to set the properties of the mob head block entity:
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a_Player.GetWorld()->DoWithBlockEntityAt(a_PlacePosition, [&a_Player, HeadType, BlockMeta](cBlockEntity & a_BlockEntity)
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{
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ASSERT(a_BlockEntity.GetBlockType() == E_BLOCK_HEAD);
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auto & MobHeadEntity = static_cast<cMobHeadEntity &>(a_BlockEntity);
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int Rotation = 0;
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if (BlockMeta == 1)
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{
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Rotation = FloorC(a_Player.GetYaw() * 16.0f / 360.0f + 0.5f) & 0x0f;
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}
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MobHeadEntity.SetType(HeadType);
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MobHeadEntity.SetRotation(static_cast<eMobHeadRotation>(Rotation));
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return false;
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});
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}
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/** Spawns a wither if the wither skull placed at the specified coords completes wither's spawning formula.
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Returns true if the wither was created. */
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bool TrySpawnWitherAround(cPlayer & a_Player, const Vector3i a_BlockPos)
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{
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// No wither can be created at Y < 2 - not enough space for the formula:
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if (a_BlockPos.y < 2)
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{
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return false;
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}
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// Check for all relevant wither locations:
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static const Vector3i RelCoords[] =
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{
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{ 0, 0, 0},
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{ 1, 0, 0},
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{-1, 0, 0},
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{ 0, 0, 1},
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{ 0, 0, -1},
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};
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for (auto & RelCoord : RelCoords)
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{
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if (TrySpawnWitherAt(
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*a_Player.GetWorld(), a_Player,
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a_BlockPos,
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RelCoord.x, RelCoord.z
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))
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{
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return true;
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}
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} // for i - RelCoords[]
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return false;
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}
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/** Tries to spawn a wither at the specified offset from the placed head block.
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PlacedHead coords are used to override the block query - at those coords the block is not queried from the world,
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but assumed to be a head instead.
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Offset is used to shift the image around the X and Z axis.
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Returns true iff the wither was created successfully. */
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bool TrySpawnWitherAt(
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cWorld & a_World, cPlayer & a_Player,
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Vector3i a_PlacedHeadPos,
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int a_OffsetX, int a_OffsetZ
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)
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{
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// Image for the wither at the X axis:
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static const sSetBlock ImageWitherX[] =
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{
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{-1, 0, 0, E_BLOCK_HEAD, 0},
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{ 0, 0, 0, E_BLOCK_HEAD, 0},
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{ 1, 0, 0, E_BLOCK_HEAD, 0},
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{-1, -1, 0, E_BLOCK_SOULSAND, 0},
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{ 0, -1, 0, E_BLOCK_SOULSAND, 0},
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{ 1, -1, 0, E_BLOCK_SOULSAND, 0},
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{-1, -2, 0, E_BLOCK_AIR, 0},
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{ 0, -2, 0, E_BLOCK_SOULSAND, 0},
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{ 1, -2, 0, E_BLOCK_AIR, 0},
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};
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// Image for the wither at the Z axis:
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static const sSetBlock ImageWitherZ[] =
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{
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{ 0, 0, -1, E_BLOCK_HEAD, 0},
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{ 0, 0, 0, E_BLOCK_HEAD, 0},
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{ 0, 0, 1, E_BLOCK_HEAD, 0},
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{ 0, -1, -1, E_BLOCK_SOULSAND, 0},
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{ 0, -1, 0, E_BLOCK_SOULSAND, 0},
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{ 0, -1, 1, E_BLOCK_SOULSAND, 0},
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{ 0, -2, -1, E_BLOCK_AIR, 0},
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{ 0, -2, 0, E_BLOCK_SOULSAND, 0},
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{ 0, -2, 1, E_BLOCK_AIR, 0},
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};
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// Try to spawn the wither from each image:
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return (
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TrySpawnWitherFromImage(
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a_World, a_Player, ImageWitherX,
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a_PlacedHeadPos,
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a_OffsetX, a_OffsetZ
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) ||
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TrySpawnWitherFromImage(
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a_World, a_Player, ImageWitherZ,
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a_PlacedHeadPos,
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a_OffsetX, a_OffsetZ
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)
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);
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}
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/** Tries to spawn a wither from the specified image at the specified offset from the placed head block.
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PlacedHead coords are used to override the block query - at those coords the block is not queried from the world,
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but assumed to be a head instead.
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Offset is used to shift the image around the X and Z axis.
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Returns true iff the wither was created successfully. */
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bool TrySpawnWitherFromImage(
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cWorld & a_World, cPlayer & a_Player, const sSetBlock (& a_Image)[9],
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Vector3i a_PlacedHeadPos,
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int a_OffsetX, int a_OffsetZ
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)
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{
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std::array<Vector3i, 9> PositionsToClear;
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// Check each block individually:
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for (size_t i = 0; i != std::size(a_Image); i++)
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{
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// The absolute coords of the block in the image to check.
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const Vector3i Block(
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a_PlacedHeadPos.x + a_OffsetX + a_Image[i].GetX(),
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a_PlacedHeadPos.y + a_Image[i].GetY(),
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a_PlacedHeadPos.z + a_OffsetZ + a_Image[i].GetZ()
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);
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// If the query is for the head the player is about to place (remember, it hasn't been set into the world yet), short-circuit-evaluate it:
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if (Block == a_PlacedHeadPos)
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{
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if (a_Image[i].m_BlockType != E_BLOCK_HEAD)
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{
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return false; // Didn't match.
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}
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PositionsToClear[i] = Block;
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continue; // Matched, continue checking the rest of the image.
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}
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// Query the world block:
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BLOCKTYPE BlockType;
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NIBBLETYPE BlockMeta;
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if (!a_World.GetBlockTypeMeta(Block, BlockType, BlockMeta))
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{
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// Cannot query block, assume unloaded chunk, fail to spawn the wither
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return false;
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}
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// Compare the world block:
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if (BlockType != a_Image[i].m_BlockType)
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{
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return false;
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}
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// If it is a mob head, check it's a wither skull using the block entity:
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if (
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(BlockType == E_BLOCK_HEAD) &&
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!a_World.DoWithBlockEntityAt(Block, [&](cBlockEntity & a_BlockEntity)
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{
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ASSERT(a_BlockEntity.GetBlockType() == E_BLOCK_HEAD);
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return static_cast<cMobHeadEntity &>(a_BlockEntity).GetType() == SKULL_TYPE_WITHER;
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})
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)
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{
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return false;
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}
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// Matched, continue checking:
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PositionsToClear[i] = Block;
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} // for i - a_Image
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// All image blocks matched, try replace the image with air blocks:
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if (
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!a_Player.PlaceBlocks(
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{
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{ PositionsToClear[0], E_BLOCK_AIR, 0 },
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{ PositionsToClear[1], E_BLOCK_AIR, 0 },
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{ PositionsToClear[2], E_BLOCK_AIR, 0 },
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{ PositionsToClear[3], E_BLOCK_AIR, 0 },
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{ PositionsToClear[4], E_BLOCK_AIR, 0 },
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{ PositionsToClear[5], E_BLOCK_AIR, 0 },
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{ PositionsToClear[6], E_BLOCK_AIR, 0 },
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{ PositionsToClear[7], E_BLOCK_AIR, 0 },
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{ PositionsToClear[8], E_BLOCK_AIR, 0 },
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})
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)
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{
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return false;
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}
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// Spawn the wither:
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int BlockX = a_PlacedHeadPos.x + a_OffsetX;
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int BlockZ = a_PlacedHeadPos.z + a_OffsetZ;
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a_World.SpawnMob(static_cast<double>(BlockX) + 0.5, a_PlacedHeadPos.y - 2, static_cast<double>(BlockZ) + 0.5, mtWither, false);
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AwardSpawnWitherAchievement(a_World, {BlockX, a_PlacedHeadPos.y - 2, BlockZ});
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return true;
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}
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/** Awards the achievement to all players close to the specified point. */
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void AwardSpawnWitherAchievement(cWorld & a_World, Vector3i a_BlockPos)
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{
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Vector3f Pos(a_BlockPos);
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a_World.ForEachPlayer([=](cPlayer & a_Player)
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{
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// If player is close, award achievement:
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double Dist = (a_Player.GetPosition() - Pos).Length();
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if (Dist < 50.0)
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{
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a_Player.AwardAchievement(CustomStatistic::AchSpawnWither);
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}
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return false;
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}
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);
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}
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/** Converts the block face of the placement (which face of the block was clicked to place the head)
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into the block's metadata value. */
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static NIBBLETYPE BlockFaceToBlockMeta(int a_BlockFace)
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{
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switch (a_BlockFace)
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{
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case BLOCK_FACE_TOP: return 0x01; // On ground (rotation provided in block entity)
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case BLOCK_FACE_XM: return 0x04; // west wall, facing east
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case BLOCK_FACE_XP: return 0x05; // east wall, facing west
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case BLOCK_FACE_ZM: return 0x02; // north wall, facing south
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case BLOCK_FACE_ZP: return 0x03; // south wall, facing north
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default:
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{
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ASSERT(!"Unhandled block face");
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return 0;
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}
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}
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}
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virtual bool IsPlaceable(void) override
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{
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return true;
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}
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} ;
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