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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;
+
+
+ /// 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 overrides:
+ virtual bool Item(cChunk * a_Chunk) override;
+} ;
+
+
+
+
+