LineBlockTracer.h

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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;
 
 
 
 
 
class cLineBlockTracer:
    public cBlockTracer
{
    using Super = cBlockTracer;
 
public:
 
    enum eLineOfSight
    {
        // Bit flags used for LineOfSightTrace's Sight parameter:
        losAir = 1,    // Can see through air
        losWater = 2,  // Can see through water
        losLava = 4,   // Can see through lava
 
        // Common combinations:
        losAirWaterLava = losAir | losWater | losLava,
        losAirWater = losAir | losWater,
    };
 
 
    cLineBlockTracer(cWorld & a_World, cCallbacks & a_Callbacks);
 
    bool Trace(Vector3d a_Start, Vector3d a_End);
 
 
    // Utility functions for simple one-line usage:
 
    static bool Trace(cWorld & a_World, cCallbacks & a_Callbacks, const Vector3d a_Start, const Vector3d a_End);
 
    static bool LineOfSightTrace(cWorld & a_World, const Vector3d & a_Start, const Vector3d & a_End, int a_Sight);
 
    static bool FirstSolidHitTrace(
        cWorld & a_World,
        const Vector3d & a_Start, const Vector3d & a_End,
        Vector3d & a_HitCoords,
        Vector3i & a_HitBlockCoords,
        eBlockFace & a_HitBlockFace
    );
 
protected:
    Vector3d m_Start;
 
    Vector3d m_End;
 
    Vector3d m_Diff;
 
    Vector3i m_Dir;
 
    Vector3i m_Current;
 
    eBlockFace m_CurrentFace;
 
 
    void FixStartAboveWorld(void);
 
    void FixStartBelowWorld(void);
 
    void CalcXZIntersection(double a_Y, double & a_IntersectX, double & a_IntersectZ);
 
    bool MoveToNextBlock(void);
 
    bool ChunkCallback(cChunk * a_Chunk);
} ;