F:/My Projects/LSEngine/Modules/LSMathLib/Src/Line/LSMLine3.h

#ifndef __LSM_LINE3_H__
#define __LSM_LINE3_H__

#include "../LSMMathLib.h"
#include "../Vector/LSMVector3.h"

namespace lsm {

        class CLine3 {
                // All is public.  This class has no secrets.
        public :
                // == Various constructors.
                LSE_INLINE LSE_CALLCTOR                 CLine3();
                LSE_INLINE LSE_CALLCTOR                 CLine3( const CVector3 &_vStart, const CVector3 &_vEnd );
                LSE_INLINE LSE_CALLCTOR                 CLine3( const CLine3 &_lLine );


                // == Functions.
                LSE_INLINE CVector3 LSE_FCALL   ClosestPointOnLineToPoint( const CVector3 &_vPoint, LSREAL &_fT ) const;


                // == Members.
                CVector3                                                p;

                CVector3                                                q;
        };


        // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
        // DEFINITIONS
        // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
        // == Various constructors.
        LSE_INLINE LSE_CALLCTOR CLine3::CLine3() {
        }
        LSE_INLINE LSE_CALLCTOR CLine3::CLine3( const CVector3 &_vStart, const CVector3 &_vEnd ) {
                p = _vStart;
                q = _vEnd;
        }
        LSE_INLINE LSE_CALLCTOR CLine3::CLine3( const CLine3 &_lLine ) {
                (*this) = _lLine;
        }

        // == Functions.
        LSE_INLINE CVector3 LSE_FCALL CLine3::ClosestPointOnLineToPoint( const CVector3 &_vPoint, LSREAL &_fT ) const {
                CVector3 vAb = q - p;
                // Project C onto AB, computing parameterized position d(t) = a + t*(b - a).
                _fT = vAb.Dot( _vPoint - p ) / vAb.LenSq();
                return p + (vAb * _fT);
        }

}       // namespace lsm

#endif  // __LSM_LINE3_H__