127 lines
3.1 KiB
C++
127 lines
3.1 KiB
C++
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// BlockTracer.h
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// Declares the classes common for all blocktracers
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#pragma once
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#include "Defines.h"
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#include "ChunkDef.h"
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// fwd: World.h
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class cWorld;
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class cBlockTracer abstract
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{
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public:
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/** The callback class is used to notify the caller of individual events that are being traced.
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*/
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class cCallbacks abstract
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{
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public:
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// Force a virtual destructor in descendants:
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virtual ~cCallbacks() {}
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/** Called on each block encountered along the path, including the first block (path start)
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When this callback returns true, the tracing is aborted.
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*/
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virtual bool OnNextBlock(Vector3i a_BlockPos, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta, eBlockFace a_EntryFace) = 0;
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/** Called on each block encountered along the path, including the first block (path start), if chunk data is not loaded
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When this callback returns true, the tracing is aborted.
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*/
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virtual bool OnNextBlockNoData(Vector3i a_BlockPos, char a_EntryFace)
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{
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UNUSED(a_BlockPos);
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UNUSED(a_EntryFace);
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return false;
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}
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/** Called when the path goes out of world, either below (a_BlockPos.y < 0) or above (a_BlockPos.y >= cChunkDef::Height)
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The coords specify the exact point at which the path exited the world.
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If this callback returns true, the tracing is aborted.
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Note that some paths can go out of the world and come back again (parabola),
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in such a case this callback is followed by OnIntoWorld() and further OnNextBlock() calls
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*/
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virtual bool OnOutOfWorld(Vector3d a_BlockPos)
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{
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UNUSED(a_BlockPos);
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return false;
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}
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/** Called when the path goes into the world, from either below (a_BlockPos.y < 0) or above (a_BlockPos.y >= cChunkDef::Height)
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The coords specify the exact point at which the path entered the world.
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If this callback returns true, the tracing is aborted.
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Note that some paths can go out of the world and come back again (parabola),
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in such a case this callback is followed by further OnNextBlock() calls
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*/
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virtual bool OnIntoWorld(Vector3d a_BlockPos)
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{
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UNUSED(a_BlockPos);
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return false;
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}
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/** Called when the path is sure not to hit any more blocks.
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Note that for some shapes this might never happen (line with constant Y)
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*/
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virtual void OnNoMoreHits(void) {}
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/** Called when the block tracing walks into a chunk that is not allocated.
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This usually means that the tracing is aborted.
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*/
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virtual void OnNoChunk(void) {}
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} ;
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/** Creates the BlockTracer parent with the specified callbacks */
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cBlockTracer(cWorld & a_World, cCallbacks & a_Callbacks) :
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m_World(&a_World),
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m_Callbacks(&a_Callbacks)
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{
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}
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/** Sets new world, returns the old one. Note that both need to be valid */
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cWorld & SetWorld(cWorld & a_World)
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{
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cWorld & Old = *m_World;
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m_World = &a_World;
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return Old;
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}
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/** Sets new callbacks, returns the old ones. Note that both need to be valid */
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cCallbacks & SetCallbacks(cCallbacks & a_NewCallbacks)
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{
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cCallbacks & Old = *m_Callbacks;
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m_Callbacks = &a_NewCallbacks;
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return Old;
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}
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protected:
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/** The world upon which to operate */
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cWorld * m_World;
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/** The callback to use for reporting */
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cCallbacks * m_Callbacks;
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} ;
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