76 lines
1.2 KiB
C++
76 lines
1.2 KiB
C++
//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose:
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//
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//=============================================================================//
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#ifndef APPARENT_VELOCITY_HELPER_H
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#define APPARENT_VELOCITY_HELPER_H
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#ifdef _WIN32
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#pragma once
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#endif
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inline float CalcDistance( float x, float y )
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{
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return x - y;
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}
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inline float CalcDistance( const Vector &a, const Vector &b )
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{
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return a.DistTo( b );
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}
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template<class T>
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class CDefaultCalcDistance
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{
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public:
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static inline float CalcDistance( const T &a, const T &b )
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{
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return ::CalcDistance( a, b );
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}
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};
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class CCalcDistance2D
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{
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public:
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static inline float CalcDistance( const Vector &a, const Vector &b )
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{
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return (a-b).Length2D();
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}
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};
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template< class T, class Functor=CDefaultCalcDistance<T> >
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class CApparentVelocity
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{
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public:
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CApparentVelocity(const T& t0)
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{
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m_LastTime = -1;
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m_LastValue = t0;
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}
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float AddSample( float time, T value )
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{
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float flRet = 0;
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if ( m_LastTime != -1 )
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{
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flRet = Functor::CalcDistance(value, m_LastValue) / (time - m_LastTime);
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}
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m_LastTime = time;
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m_LastValue = value;
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return flRet;
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}
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private:
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T m_LastValue;
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float m_LastTime;
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};
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#endif // APPARENT_VELOCITY_HELPER_H
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