C:/Work/specialnumbers_svn/NumberLib/NumbersLib/ResponseCurve.h

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#ifndef _RESPONSE_CURVE_H_
#define _RESPONSE_CURVE_H_

#include "AbstractFunction.h"

namespace luma
{
namespace numbers
{

template <class T, unsigned int n>
class ResponseCurve : public AbstractFunction<T>
{
public:
   ResponseCurve(T inputMin, T inputMax, T outputSamples[n]);

   T operator()(const T input) const;

   inline public T getInputMin() const;
   inline public T getInputMax() const;

private:
   T mInputMin;
   T mInputMax;
   T mOutputSamples[n];

   T mPeriod;
};

template <class T, unsigned int n>
ResponseCurve<T, n>::ResponseCurve(T inputMin, T inputMax, T outputSamples[n]):
   mInputMin(inputMin),
   mInputMax(inputMax),
   mPeriod((inputMax - inputMin) / (n - 1))
{
   for(unsigned int i = 0; i < n; i++)
   {
      mOutputSamples[i] = outputSamples[i];
   }
}

template <class T, unsigned int n>
T ResponseCurve<T, n>::operator()(const T input) const
{
   if(input <= mInputMin)
   {
      return mOutputSamples[0];
   }

   if(input >= mInputMax)
   {
      return mOutputSamples[n - 1];
   }

   unsigned int index = (int) ((input - mInputMin)/(mPeriod));
   T inputSampleMin = mInputMin + mPeriod*index;

   return lerp(input, inputSampleMin, inputSampleMin + mPeriod, mOutputSamples[index], mOutputSamples[index + 1]);
}

template <class T, unsigned int n>
T ResponseCurve<T, n>::getInputMin() const
{
   return mInputMin;
} 

template <class T, unsigned int n>
T ResponseCurve<T, n>::getInputMax() const
{
   return mInputMax;
}

}} //namespace

#endif //_RESPONSE_CURVE_H_

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