114 lines
3.6 KiB
C++
114 lines
3.6 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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class cLineBlockTracer :
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public cBlockTracer
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{
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typedef cBlockTracer super;
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public:
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enum eLineOfSight
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{
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// Bit flags used for LineOfSightTrace's Sight parameter:
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losAir = 1, // Can see through air
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losWater = 2, // Can see through water
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losLava = 4, // Can see through lava
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// Common combinations:
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losAirWaterLava = losAir | losWater | losLava,
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losAirWater = losAir | losWater,
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};
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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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/** Returns true if the two positions are within line of sight (not obscured by blocks).
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a_Sight specifies which blocks are considered transparent for the trace, is an OR-combination of eLineOfSight constants. */
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static bool LineOfSightTrace(cWorld & a_World, const Vector3d & a_Start, const Vector3d & a_End, int a_Sight);
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/** Traces until the first solid block is hit (or until end, whichever comes first.
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If a solid block was hit, returns true and fills a_HitCoords, a_HitBlockCoords and a_HitBlockFace.
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If a_End is encountered without hitting any solid block, returns false and doesn't touch a_HitCoords, a_HitBlockCoords nor a_HitBlockFace.
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a_HitCoords is the exact coords of the hit,
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a_HitBlockCoords are the coords of the solid block that was hit,
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a_HitBlockFace is the face of the solid block that was hit. */
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static bool FirstSolidHitTrace(
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cWorld & a_World,
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const Vector3d & a_Start, const Vector3d & a_End,
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Vector3d & a_HitCoords,
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Vector3i & a_HitBlockCoords,
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eBlockFace & a_HitBlockFace
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);
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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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eBlockFace 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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bool ChunkCallback(cChunk * a_Chunk);
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} ;
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