VoltOctaveTaperDelegate.h

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// -----------------------------------------------------------------------------
//    ASPiK AAX Shell File:  voltoctavetaperdelegate.h
//
// -----------------------------------------------------------------------------
#ifndef __VOLTOCTAVETAPERDELEGATE_H
#define __VOLTOCTAVETAPERDELEGATE_H

#include "AAX_ITaperDelegate.h"
#include "AAX_UtilsNative.h"
#include "AAX.h"    //for types

#include <cmath>    //for floor(), log()

template <typename T, int32_t RealPrecision=1000>

class VoltOctaveTaperDelegate : public AAX_ITaperDelegate<T>
{
public:
        VoltOctaveTaperDelegate(T minValue=0, T maxValue=1);

    // --- Virtual Overrides
    VoltOctaveTaperDelegate<T, RealPrecision>*  Clone() const;
    T       GetMinimumValue() const { return mMinValue; }
    T       GetMaximumValue() const { return mMaxValue; }
    T       ConstrainRealValue(T value) const;
    T       NormalizedToReal(double normalizedValue) const;
    double  RealToNormalized(T realValue) const;

protected:
    T   Round(double iValue) const;

    // --- cooked to V/O Scaled 0->1 param
    inline double calcVoltOctaveParameter(double fCookedParam) const
    {
        double dOctaves = log2(getMax()/getMin());
        return log2( fCookedParam/getMin() )/dOctaves;
    }

    // --- fPluginValue = 0->1
    //     returns V/O scaled version 0->1
    inline double calcVoltOctavePluginValue(double fPluginValue) const
    {
        double dOctaves = log2(getMax()/getMin());
        float fDisplay = getMin()*exp2(fPluginValue*dOctaves);
        float fDiff = getMax() - getMin();
        return (fDisplay - getMin())/fDiff;
    }

    double getMin() const {return (double)mMinValue;}
    double getMax() const {return (double)mMaxValue;}

private:
    T   mMinValue;
    T   mMaxValue;
};

template <typename T, int32_t RealPrecision>
T   VoltOctaveTaperDelegate<T, RealPrecision>::Round(double iValue) const
{
    double precision = RealPrecision;
    if (precision > 0)
        return static_cast<T>(floor(iValue * precision + 0.5) / precision);
    return static_cast<T>(iValue);
}

template <typename T, int32_t RealPrecision>
VoltOctaveTaperDelegate<T, RealPrecision>::VoltOctaveTaperDelegate(T minValue, T maxValue)  :  AAX_ITaperDelegate<T>(),
    mMinValue(minValue),
    mMaxValue(maxValue)
{

}

template <typename T, int32_t RealPrecision>
VoltOctaveTaperDelegate<T, RealPrecision>*      VoltOctaveTaperDelegate<T, RealPrecision>::Clone() const
{
    return new VoltOctaveTaperDelegate(*this);
}

template <typename T, int32_t RealPrecision>
T       VoltOctaveTaperDelegate<T, RealPrecision>::ConstrainRealValue(T value)  const
{
    if (RealPrecision)
        value = Round(value);       //reduce the precision to get proper rounding behavior with integers.

    if (value > mMaxValue)
        return mMaxValue;
    if (value < mMinValue)
        return mMinValue;
    return value;
}

template <typename T, int32_t RealPrecision>
T       VoltOctaveTaperDelegate<T, RealPrecision>::NormalizedToReal(double normalizedValue) const
{
    normalizedValue = calcVoltOctavePluginValue(normalizedValue);
    double doubleRealValue = normalizedValue*(mMaxValue - mMinValue) + mMinValue;
    T realValue = (T) doubleRealValue;

    return ConstrainRealValue(realValue);
}

template <typename T, int32_t RealPrecision>
double  VoltOctaveTaperDelegate<T, RealPrecision>::RealToNormalized(T realValue) const
{
    return calcVoltOctaveParameter(realValue);
}

#endif // __VOLTOCTAVETAPERDELEGATE_H