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