#pragma once
#include "BlockEntity.h"
enum ENUM_PURE
{
E_PURE_UPDOWN = 0,
E_PURE_DOWN = 1,
E_PURE_NONE = 2
};
class cBlockRailHandler :
public cBlockHandler
{
typedef cBlockHandler super;
public:
cBlockRailHandler(BLOCKTYPE a_BlockType)
: cBlockHandler(a_BlockType)
{
}
virtual bool GetPlacementBlockTypeMeta(
cChunkInterface & a_ChunkInterface, cPlayer * a_Player,
int a_BlockX, int a_BlockY, int a_BlockZ, eBlockFace a_BlockFace,
int a_CursorX, int a_CursorY, int a_CursorZ,
BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta
) /*override*/
{
a_BlockType = m_BlockType;
a_BlockMeta = FindMeta(a_ChunkInterface, a_BlockX, a_BlockY, a_BlockZ);
return true;
}
virtual void OnPlaced(cChunkInterface & a_ChunkInterface, cWorldInterface & a_WorldInterface, int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta) /*override*/
{
super::OnPlaced(a_ChunkInterface, a_WorldInterface, a_BlockX, a_BlockY, a_BlockZ, a_BlockType, a_BlockMeta);
// Alert diagonal rails
OnNeighborChanged(a_ChunkInterface, a_BlockX + 1, a_BlockY + 1, a_BlockZ);
OnNeighborChanged(a_ChunkInterface, a_BlockX - 1, a_BlockY + 1, a_BlockZ);
OnNeighborChanged(a_ChunkInterface, a_BlockX, a_BlockY + 1, a_BlockZ + 1);
OnNeighborChanged(a_ChunkInterface, a_BlockX, a_BlockY + 1, a_BlockZ - 1);
OnNeighborChanged(a_ChunkInterface, a_BlockX + 1, a_BlockY - 1, a_BlockZ);
OnNeighborChanged(a_ChunkInterface, a_BlockX - 1, a_BlockY - 1, a_BlockZ);
OnNeighborChanged(a_ChunkInterface, a_BlockX, a_BlockY - 1, a_BlockZ + 1);
OnNeighborChanged(a_ChunkInterface, a_BlockX, a_BlockY - 1, a_BlockZ - 1);
}
virtual void OnDestroyed(cChunkInterface & a_ChunkInterface, cWorldInterface & a_WorldInterface, int a_BlockX, int a_BlockY, int a_BlockZ) /*override*/
{
super::OnDestroyed(a_ChunkInterface, a_WorldInterface, a_BlockX, a_BlockY, a_BlockZ);
// Alert diagonal rails
OnNeighborChanged(a_ChunkInterface, a_BlockX + 1, a_BlockY + 1, a_BlockZ);
OnNeighborChanged(a_ChunkInterface, a_BlockX - 1, a_BlockY + 1, a_BlockZ);
OnNeighborChanged(a_ChunkInterface, a_BlockX, a_BlockY + 1, a_BlockZ + 1);
OnNeighborChanged(a_ChunkInterface, a_BlockX, a_BlockY + 1, a_BlockZ - 1);
OnNeighborChanged(a_ChunkInterface, a_BlockX + 1, a_BlockY - 1, a_BlockZ);
OnNeighborChanged(a_ChunkInterface, a_BlockX - 1, a_BlockY - 1, a_BlockZ);
OnNeighborChanged(a_ChunkInterface, a_BlockX, a_BlockY - 1, a_BlockZ + 1);
OnNeighborChanged(a_ChunkInterface, a_BlockX, a_BlockY - 1, a_BlockZ - 1);
}
virtual void OnNeighborChanged(cChunkInterface & a_ChunkInterface, int a_BlockX, int a_BlockY, int a_BlockZ) /*override*/
{
NIBBLETYPE Meta = a_ChunkInterface.GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ);
if (IsUnstable(a_ChunkInterface, a_BlockX, a_BlockY, a_BlockZ) && (Meta != FindMeta(a_ChunkInterface, a_BlockX, a_BlockY, a_BlockZ)))
{
a_ChunkInterface.FastSetBlock(a_BlockX, a_BlockY, a_BlockZ, m_BlockType, FindMeta(a_ChunkInterface, a_BlockX, a_BlockY, a_BlockZ));
}
}
virtual void ConvertToPickups(cItems & a_Pickups, NIBBLETYPE a_BlockMeta) /*override*/
{
super::ConvertToPickups(a_Pickups, 0);
}
virtual bool CanBeAt(cChunkInterface & a_ChunkInterface, int a_RelX, int a_RelY, int a_RelZ, const cChunk & a_Chunk) /*override*/
{
if (a_RelY <= 0)
{
return false;
}
if (!cBlockInfo::IsSolid(a_Chunk.GetBlock(a_RelX, a_RelY - 1, a_RelZ)))
{
return false;
}
NIBBLETYPE Meta = a_Chunk.GetMeta(a_RelX, a_RelY, a_RelZ);
switch (Meta)
{
case E_META_RAIL_ASCEND_XP:
case E_META_RAIL_ASCEND_XM:
case E_META_RAIL_ASCEND_ZM:
case E_META_RAIL_ASCEND_ZP:
{
// Mapping between the meta and the neighbors that need checking
Meta -= E_META_RAIL_ASCEND_XP; // Base index at zero
static const struct
{
int x, z;
} Coords[] =
{
{ 1, 0}, // east, XP
{-1, 0}, // west, XM
{ 0, -1}, // north, ZM
{ 0, 1}, // south, ZP
} ;
BLOCKTYPE BlockType;
NIBBLETYPE BlockMeta;
if (!a_Chunk.UnboundedRelGetBlock(a_RelX + Coords[Meta].x, a_RelY, a_RelZ + Coords[Meta].z, BlockType, BlockMeta))
{
// Too close to the edge, cannot simulate
return true;
}
return cBlockInfo::IsSolid(BlockType);
}
}
return true;
}
NIBBLETYPE FindMeta(cChunkInterface & a_ChunkInterface, int a_BlockX, int a_BlockY, int a_BlockZ)
{
NIBBLETYPE Meta = 0;
char RailsCnt = 0;
bool Neighbors[8]; // 0 - EAST, 1 - WEST, 2 - NORTH, 3 - SOUTH, 4 - EAST UP, 5 - WEST UP, 6 - NORTH UP, 7 - SOUTH UP
memset(Neighbors, 0, sizeof(Neighbors));
Neighbors[0] = (IsUnstable(a_ChunkInterface, a_BlockX + 1, a_BlockY, a_BlockZ) || !IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_EAST, E_PURE_DOWN));
Neighbors[1] = (IsUnstable(a_ChunkInterface, a_BlockX - 1, a_BlockY, a_BlockZ) || !IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_WEST, E_PURE_DOWN));
Neighbors[2] = (IsUnstable(a_ChunkInterface, a_BlockX, a_BlockY, a_BlockZ - 1) || !IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_NORTH, E_PURE_DOWN));
Neighbors[3] = (IsUnstable(a_ChunkInterface, a_BlockX, a_BlockY, a_BlockZ + 1) || !IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_SOUTH, E_PURE_DOWN));
Neighbors[4] = (IsUnstable(a_ChunkInterface, a_BlockX + 1, a_BlockY + 1, a_BlockZ) || !IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY + 1, a_BlockZ, BLOCK_FACE_EAST, E_PURE_NONE));
Neighbors[5] = (IsUnstable(a_ChunkInterface, a_BlockX - 1, a_BlockY + 1, a_BlockZ) || !IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY + 1, a_BlockZ, BLOCK_FACE_WEST, E_PURE_NONE));
Neighbors[6] = (IsUnstable(a_ChunkInterface, a_BlockX, a_BlockY + 1, a_BlockZ - 1) || !IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY + 1, a_BlockZ, BLOCK_FACE_NORTH, E_PURE_NONE));
Neighbors[7] = (IsUnstable(a_ChunkInterface, a_BlockX, a_BlockY + 1, a_BlockZ + 1) || !IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY + 1, a_BlockZ, BLOCK_FACE_SOUTH, E_PURE_NONE));
if (IsUnstable(a_ChunkInterface, a_BlockX + 1, a_BlockY - 1, a_BlockZ) || !IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY - 1, a_BlockZ, BLOCK_FACE_EAST))
Neighbors[0] = true;
if (IsUnstable(a_ChunkInterface, a_BlockX - 1, a_BlockY - 1, a_BlockZ) || !IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY - 1, a_BlockZ, BLOCK_FACE_WEST))
Neighbors[1] = true;
if (IsUnstable(a_ChunkInterface, a_BlockX, a_BlockY - 1, a_BlockZ - 1) || !IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY - 1, a_BlockZ, BLOCK_FACE_NORTH))
Neighbors[2] = true;
if (IsUnstable(a_ChunkInterface, a_BlockX, a_BlockY - 1, a_BlockZ + 1) || !IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY - 1, a_BlockZ, BLOCK_FACE_SOUTH))
Neighbors[3] = true;
for (int i = 0; i < 8; i++)
{
if (Neighbors[i])
{
RailsCnt++;
}
}
if (RailsCnt == 1)
{
if (Neighbors[7]) return E_META_RAIL_ASCEND_ZP;
else if (Neighbors[6]) return E_META_RAIL_ASCEND_ZM;
else if (Neighbors[5]) return E_META_RAIL_ASCEND_XM;
else if (Neighbors[4]) return E_META_RAIL_ASCEND_XP;
else if (Neighbors[0] || Neighbors[1]) return E_META_RAIL_XM_XP;
else if (Neighbors[2] || Neighbors[3]) return E_META_RAIL_ZM_ZP;
ASSERT(!"Weird neighbor count");
return Meta;
}
for (int i = 0; i < 4; i++)
{
if (Neighbors[i + 4])
{
Neighbors[i] = true;
}
}
if (RailsCnt > 1)
{
if (Neighbors[3] && Neighbors[0] && CanThisRailCurve()) return E_META_RAIL_CURVED_ZP_XP;
else if (Neighbors[3] && Neighbors[1] && CanThisRailCurve()) return E_META_RAIL_CURVED_ZP_XM;
else if (Neighbors[2] && Neighbors[0] && CanThisRailCurve()) return E_META_RAIL_CURVED_ZM_XP;
else if (Neighbors[2] && Neighbors[1] && CanThisRailCurve()) return E_META_RAIL_CURVED_ZM_XM;
else if (Neighbors[7] && Neighbors[2]) return E_META_RAIL_ASCEND_ZP;
else if (Neighbors[3] && Neighbors[6]) return E_META_RAIL_ASCEND_ZM;
else if (Neighbors[5] && Neighbors[0]) return E_META_RAIL_ASCEND_XM;
else if (Neighbors[4] && Neighbors[1]) return E_META_RAIL_ASCEND_XP;
else if (Neighbors[0] && Neighbors[1]) return E_META_RAIL_XM_XP;
else if (Neighbors[2] && Neighbors[3]) return E_META_RAIL_ZM_ZP;
if (CanThisRailCurve())
{
ASSERT(!"Weird neighbor count");
}
}
return Meta;
}
inline bool CanThisRailCurve(void)
{
return m_BlockType == E_BLOCK_RAIL;
}
bool IsUnstable(cChunkInterface & a_ChunkInterface, int a_BlockX, int a_BlockY, int a_BlockZ)
{
if (!IsBlockRail(a_ChunkInterface.GetBlock(a_BlockX, a_BlockY, a_BlockZ)))
{
return false;
}
NIBBLETYPE Meta = a_ChunkInterface.GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ);
switch (Meta)
{
case E_META_RAIL_ZM_ZP:
{
if (
IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_NORTH, E_PURE_DOWN) ||
IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_SOUTH, E_PURE_DOWN)
)
{
return true;
}
break;
}
case E_META_RAIL_XM_XP:
{
if (
IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_EAST, E_PURE_DOWN) ||
IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_WEST, E_PURE_DOWN)
)
{
return true;
}
break;
}
case E_META_RAIL_ASCEND_XP:
{
if (
IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY + 1, a_BlockZ, BLOCK_FACE_EAST) ||
IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_WEST)
)
{
return true;
}
break;
}
case E_META_RAIL_ASCEND_XM:
{
if (
IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_EAST) ||
IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY + 1, a_BlockZ, BLOCK_FACE_WEST)
)
{
return true;
}
break;
}
case E_META_RAIL_ASCEND_ZM:
{
if (
IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY + 1, a_BlockZ, BLOCK_FACE_NORTH) ||
IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_SOUTH)
)
{
return true;
}
break;
}
case E_META_RAIL_ASCEND_ZP:
{
if (
IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_NORTH) ||
IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY + 1, a_BlockZ, BLOCK_FACE_SOUTH)
)
{
return true;
}
break;
}
case E_META_RAIL_CURVED_ZP_XP:
{
if (
IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_SOUTH) ||
IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_EAST)
)
{
return true;
}
break;
}
case E_META_RAIL_CURVED_ZP_XM:
{
if (
IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_SOUTH) ||
IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_WEST)
)
{
return true;
}
break;
}
case E_META_RAIL_CURVED_ZM_XM:
{
if (
IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_NORTH) ||
IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_WEST)
)
{
return true;
}
break;
}
case E_META_RAIL_CURVED_ZM_XP:
{
if (
IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_NORTH) ||
IsNotConnected(a_ChunkInterface, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_EAST)
)
{
return true;
}
break;
}
}
return false;
}
bool IsNotConnected(cChunkInterface & a_ChunkInterface, int a_BlockX, int a_BlockY, int a_BlockZ, eBlockFace a_BlockFace, char a_Pure = 0)
{
AddFaceDirection(a_BlockX, a_BlockY, a_BlockZ, a_BlockFace, false);
NIBBLETYPE Meta;
if (!IsBlockRail(a_ChunkInterface.GetBlock(a_BlockX, a_BlockY, a_BlockZ)))
{
if (!IsBlockRail(a_ChunkInterface.GetBlock(a_BlockX, a_BlockY + 1, a_BlockZ)) || (a_Pure != E_PURE_UPDOWN))
{
if (!IsBlockRail(a_ChunkInterface.GetBlock(a_BlockX, a_BlockY - 1, a_BlockZ)) || (a_Pure == E_PURE_NONE))
{
return true;
}
else
{
Meta = a_ChunkInterface.GetBlockMeta(a_BlockX, a_BlockY - 1, a_BlockZ);
}
}
else
{
Meta = a_ChunkInterface.GetBlockMeta(a_BlockX, a_BlockY + 1, a_BlockZ);
}
}
else
{
Meta = a_ChunkInterface.GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ);
}
switch (a_BlockFace)
{
case BLOCK_FACE_NORTH:
{
if (
(Meta == E_META_RAIL_ZM_ZP) ||
(Meta == E_META_RAIL_ASCEND_ZM) ||
(Meta == E_META_RAIL_ASCEND_ZP) ||
(Meta == E_META_RAIL_CURVED_ZP_XP) ||
(Meta == E_META_RAIL_CURVED_ZP_XM)
)
{
return false;
}
break;
}
case BLOCK_FACE_SOUTH:
{
if (
(Meta == E_META_RAIL_ZM_ZP) ||
(Meta == E_META_RAIL_ASCEND_ZM) ||
(Meta == E_META_RAIL_ASCEND_ZP) ||
(Meta == E_META_RAIL_CURVED_ZM_XP) ||
(Meta == E_META_RAIL_CURVED_ZM_XM)
)
{
return false;
}
break;
}
case BLOCK_FACE_EAST:
{
if (
(Meta == E_META_RAIL_XM_XP) ||
(Meta == E_META_RAIL_ASCEND_XP) ||
(Meta == E_META_RAIL_ASCEND_XM) ||
(Meta == E_META_RAIL_CURVED_ZP_XM) ||
(Meta == E_META_RAIL_CURVED_ZM_XM)
)
{
return false;
}
break;
}
case BLOCK_FACE_WEST:
{
if (
(Meta == E_META_RAIL_XM_XP) ||
(Meta == E_META_RAIL_ASCEND_XP) ||
(Meta == E_META_RAIL_ASCEND_XM) ||
(Meta == E_META_RAIL_CURVED_ZP_XP) ||
(Meta == E_META_RAIL_CURVED_ZM_XP)
)
{
return false;
}
break;
}
default: break;
}
return true;
}
virtual NIBBLETYPE MetaRotateCCW(NIBBLETYPE a_Meta) /*override*/
{
// Bit 0x08 is a flag when a_Meta is in the range 0x00--0x05 and 0x0A--0x0F.
// Bit 0x08 specifies direction when a_Meta is in the range 0x06-0x09.
if ((a_Meta < 0x06) || (a_Meta > 0x09))
{
// Save powered rail flag.
NIBBLETYPE OtherMeta = a_Meta & 0x08;
// Rotates according to table; 0x07 == 0111.
// Rails can either be flat (North/South) or Ascending (Asc. East)
switch (a_Meta & 0x07)
{
case 0x00: return 0x01 + OtherMeta; // North/South -> East/West
case 0x01: return 0x00 + OtherMeta; // East/West -> North/South
case 0x02: return 0x04 + OtherMeta; // Asc. East -> Asc. North
case 0x04: return 0x03 + OtherMeta; // Asc. North -> Asc. West
case 0x03: return 0x05 + OtherMeta; // Asc. West -> Asc. South
case 0x05: return 0x02 + OtherMeta; // Asc. South -> Asc. East
}
}
else
{
switch (a_Meta)
{
// Corner Directions
case 0x06: return 0x09; // Northwest Cnr. -> Southwest Cnr.
case 0x07: return 0x06; // Northeast Cnr. -> Northwest Cnr.
case 0x08: return 0x07; // Southeast Cnr. -> Northeast Cnr.
case 0x09: return 0x08; // Southwest Cnr. -> Southeast Cnr.
}
}
// To avoid a compiler warning;
return a_Meta;
}
virtual NIBBLETYPE MetaRotateCW(NIBBLETYPE a_Meta) /*override*/
{
// Bit 0x08 is a flag for value in the range 0x00--0x05 and specifies direction for values withint 0x006--0x09.
if ((a_Meta < 0x06) || (a_Meta > 0x09))
{
// Save powered rail flag.
NIBBLETYPE OtherMeta = a_Meta & 0x08;
// Rotates according to table; 0x07 == 0111.
// Rails can either be flat (North/South) or Ascending (Asc. East)
switch (a_Meta & 0x07)
{
case 0x00: return 0x01 + OtherMeta; // North/South -> East/West
case 0x01: return 0x00 + OtherMeta; // East/West -> North/South
case 0x02: return 0x05 + OtherMeta; // Asc. East -> Asc. South
case 0x05: return 0x03 + OtherMeta; // Asc. South -> Asc. West
case 0x03: return 0x04 + OtherMeta; // Asc. West -> Asc. North
case 0x04: return 0x02 + OtherMeta; // Asc. North -> Asc. East
}
}
else
{
switch (a_Meta)
{
// Corner Directions
case 0x06: return 0x07; // Northwest Cnr. -> Northeast Cnr.
case 0x07: return 0x08; // Northeast Cnr. -> Southeast Cnr.
case 0x08: return 0x09; // Southeast Cnr. -> Southwest Cnr.
case 0x09: return 0x06; // Southwest Cnr. -> Northwest Cnr.
}
}
// To avoid a compiler warning;
return a_Meta;
}
virtual NIBBLETYPE MetaMirrorXY(NIBBLETYPE a_Meta) /*override*/
{
// Bit 0x08 is a flag for value in the range 0x00--0x05 and specifies direction for values withint 0x006--0x09.
if ((a_Meta < 0x06) || (a_Meta > 0x09))
{
// Save powered rail flag.
NIBBLETYPE OtherMeta = a_Meta & 0x08;
// Mirrors according to table; 0x07 == 0111.
// Rails can either be flat (North/South) or Ascending (Asc. East)
switch (a_Meta & 0x07)
{
case 0x05: return 0x04 + OtherMeta; // Asc. South -> Asc. North
case 0x04: return 0x05 + OtherMeta; // Asc. North -> Asc. South
}
}
else
{
switch (a_Meta)
{
// Corner Directions
case 0x06: return 0x09; // Northwest Cnr. -> Southwest Cnr.
case 0x07: return 0x08; // Northeast Cnr. -> Southeast Cnr.
case 0x08: return 0x07; // Southeast Cnr. -> Northeast Cnr.
case 0x09: return 0x06; // Southwest Cnr. -> Northwest Cnr.
}
}
// To avoid a compiler warning;
return a_Meta;
}
virtual NIBBLETYPE MetaMirrorYZ(NIBBLETYPE a_Meta) /*override*/
{
// Bit 0x08 is a flag for value in the range 0x00--0x05 and specifies direction for values withint 0x006--0x09.
if ((a_Meta < 0x06) || (a_Meta > 0x09))
{
// Save powered rail flag.
NIBBLETYPE OtherMeta = a_Meta & 0x08;
// Mirrors according to table; 0x07 == 0111.
// Rails can either be flat (North/South) or Ascending (Asc. East)
switch (a_Meta & 0x07)
{
case 0x02: return 0x03 + OtherMeta; // Asc. East -> Asc. West
case 0x03: return 0x02 + OtherMeta; // Asc. West -> Asc. East
}
}
else
{
switch (a_Meta)
{
// Corner Directions
case 0x06: return 0x07; // Northwest Cnr. -> Northeast Cnr.
case 0x07: return 0x06; // Northeast Cnr. -> Northwest Cnr.
case 0x08: return 0x09; // Southeast Cnr. -> Southwest Cnr.
case 0x09: return 0x08; // Southwest Cnr. -> Southeast Cnr.
}
}
// To avoid a compiler warning;
return a_Meta;
}
} ;
