AAX_CLogTaperDelegate.h

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/*================================================================================================*/
/*
 *
 *  Copyright 2013-2017, 2019, 2023 Avid Technology, Inc.
 *  All rights reserved.
 *  
 *  CONFIDENTIAL: this document contains confidential information of Avid. Do
 *  not disclose to any third party. Use of the information contained in this
 *  document is subject to an Avid SDK license.
 *
 */
 
/*================================================================================================*/
 
 
#ifndef AAX_CLOGTAPERDELEGATE_H
#define AAX_CLOGTAPERDELEGATE_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 AAX_CLogTaperDelegate : public AAX_ITaperDelegate<T>
{
public: 
    AAX_CLogTaperDelegate(T minValue=0, T maxValue=1);
    
    //Virtual Overrides
    AAX_CLogTaperDelegate<T, RealPrecision>*    Clone() const AAX_OVERRIDE;
    T       GetMinimumValue()   const AAX_OVERRIDE              { return mMinValue; }
    T       GetMaximumValue()   const AAX_OVERRIDE              { return mMaxValue; }
    T       ConstrainRealValue(T value) const AAX_OVERRIDE;
    T       NormalizedToReal(double normalizedValue) const AAX_OVERRIDE;
    double  RealToNormalized(T realValue) const AAX_OVERRIDE;
    
protected:
    T   Round(double iValue) const;
 
private:
    T   mMinValue;
    T   mMaxValue;
};
 
template <typename T, int32_t RealPrecision>
T   AAX_CLogTaperDelegate<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>
AAX_CLogTaperDelegate<T, RealPrecision>::AAX_CLogTaperDelegate(T minValue, T maxValue)  :  AAX_ITaperDelegate<T>(),
    mMinValue(minValue),
    mMaxValue(maxValue)
{
 
}
 
template <typename T, int32_t RealPrecision>
AAX_CLogTaperDelegate<T, RealPrecision>*        AAX_CLogTaperDelegate<T, RealPrecision>::Clone() const
{
    return new AAX_CLogTaperDelegate(*this);
}
 
template <typename T, int32_t RealPrecision>
T       AAX_CLogTaperDelegate<T, RealPrecision>::ConstrainRealValue(T value)    const
{
    if (mMinValue == mMaxValue)
        return mMinValue;
    
    if (RealPrecision)
        value = Round(value);       //reduce the precision to get proper rounding behavior with integers.
    
    const T& highValue = mMaxValue > mMinValue ? mMaxValue : mMinValue;
    const T& lowValue = mMaxValue > mMinValue ? mMinValue : mMaxValue;
    
    if (value > highValue)
        return highValue;
    if (value < lowValue)
        return lowValue;
    
    return value;
}
 
template <typename T, int32_t RealPrecision>
T       AAX_CLogTaperDelegate<T, RealPrecision>::NormalizedToReal(double normalizedValue) const
{
    double minLog = AAX::SafeLog(double(mMinValue));
    double maxLog = AAX::SafeLog(double(mMaxValue));
 
    double doubleRealValue = exp(normalizedValue * (maxLog - minLog) + minLog);
    T realValue = (T) doubleRealValue;
    
    return ConstrainRealValue(realValue);
}
 
template <typename T, int32_t RealPrecision>
double  AAX_CLogTaperDelegate<T, RealPrecision>::RealToNormalized(T realValue) const
{
    double minLog = AAX::SafeLog(double(mMinValue));
    double maxLog = AAX::SafeLog(double(mMaxValue));
 
    realValue = ConstrainRealValue(realValue);
    double normalizedValue = (maxLog == minLog) ? 0.5 : (AAX::SafeLog(double(realValue)) - minLog) / (maxLog - minLog);
    return normalizedValue;
}
    
#endif // AAX_CLOGTAPERDELEGATE_H