CSplineSegmentFunction.h

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/********************************************************************************
**  This file is part of the ICF Framework. Copyright (C) Witold Gantzke & Kirill Lepskiy
**  ICF Framework may be used under the terms of the LGPL License v. 2.1 by the Free Software Foundation.
********************************************************************************/
 
#ifndef imath_CSplineSegmentFunction_included
#define imath_CSplineSegmentFunction_included
 
 
namespace imath
{
 
 
class CSplineSegmentFunction
{
public:
    // static methods
    static double GetValueKernelAt(double alpha);
    static double GetDerivativeKernelAt(double alpha);
};
 
 
// static protected inline methods
 
inline double CSplineSegmentFunction::GetValueKernelAt(double alpha)
{
    return (2 * alpha - 3) * alpha * alpha + 1;
}
 
 
inline double CSplineSegmentFunction::GetDerivativeKernelAt(double alpha)
{
    double beta = 1 - alpha;
    return alpha * beta * beta;
}
 
 
} // namespace imath
 
 
#endif // !imath_CSplineSegmentFunction_included