89 lines
2.4 KiB
C++
89 lines
2.4 KiB
C++
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// LineBlockTracer.h
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// Declares the cLineBlockTracer class representing a cBlockTracer that traces along a straight line between two points
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#pragma once
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#include "BlockTracer.h"
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// fwd: Chunk.h
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class cChunk;
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// fwd: cChunkMap.h
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typedef cItemCallback<cChunk> cChunkCallback;
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class cLineBlockTracer :
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public cBlockTracer,
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public cChunkCallback
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{
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typedef cBlockTracer super;
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public:
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cLineBlockTracer(cWorld & a_World, cCallbacks & a_Callbacks);
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/** Traces one line between Start and End; returns true if the entire line was traced (until OnNoMoreHits()) */
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bool Trace(double a_StartX, double a_StartY, double a_StartZ, double a_EndX, double a_EndY, double a_EndZ);
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// Utility functions for simple one-line usage:
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/** Traces one line between Start and End; returns true if the entire line was traced (until OnNoMoreHits()) */
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static bool Trace(cWorld & a_World, cCallbacks & a_Callbacks, double a_StartX, double a_StartY, double a_StartZ, double a_EndX, double a_EndY, double a_EndZ);
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/** Traces one line between Start and End; returns true if the entire line was traced (until OnNoMoreHits()) */
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static bool Trace(cWorld & a_World, cCallbacks & a_Callbacks, const Vector3d & a_Start, const Vector3d & a_End);
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protected:
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/** The start point of the trace */
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double m_StartX, m_StartY, m_StartZ;
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/** The end point of the trace */
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double m_EndX, m_EndY, m_EndZ;
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/** The difference in coords, End - Start */
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double m_DiffX, m_DiffY, m_DiffZ;
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/** The increment at which the block coords are going from Start to End; either +1 or -1 */
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int m_DirX, m_DirY, m_DirZ;
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/** The current block */
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int m_CurrentX, m_CurrentY, m_CurrentZ;
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/** The face through which the current block has been entered */
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char m_CurrentFace;
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/** Adjusts the start point above the world to just at the world's top */
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void FixStartAboveWorld(void);
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/** Adjusts the start point below the world to just at the world's bottom */
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void FixStartBelowWorld(void);
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/** Calculates the XZ coords of an intersection with the specified Yconst plane; assumes that such an intersection exists */
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void CalcXZIntersection(double a_Y, double & a_IntersectX, double & a_IntersectZ);
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/** Moves m_Current to the next block on the line; returns false if no move is possible (reached the end) */
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bool MoveToNextBlock(void);
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// cChunkCallback overrides:
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virtual bool Item(cChunk * a_Chunk) override;
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} ;
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