FastMap.h

#pragma once
//
//    FILE: FastMap.h
//  AUTHOR: Rob Tillaart
// VERSION: 0.3.1
// PURPOSE: class with fast map function - library for Arduino
//     URL: https://github.com/RobTillaart/FastMap
//
// HISTORY:
// see FastMap.cpp file
//

#include <Arduino.h>

#define FASTMAP_LIB_VERSION (F("0.3.1"))

class FastMap
{
public:
    FastMap();

    void init(const float in_min, const float in_max, const float out_min, const float out_max);

    float inline map (const float value)  { return _base + value * _factor; }
    float inline back (const float value) { return _backbase + value * _backfactor; }

    float constrainedMap(const float value);
    float lowerConstrainedMap(const float value);
    float upperConstrainedMap(const float value);

private:
    float _in_min, _in_max, _out_min, _out_max;
    float _factor, _base;
    float _backfactor, _backbase;
};


class FastMapDouble
{
public:
    FastMapDouble();
    void init(const double in_min, const double in_max, const double out_min, const double out_max);

    double inline map (const double value)  { return _base + value * _factor; }
    double inline back (const double value) { return _backbase + value * _backfactor; }

    double constrainedMap(const double value);
    double lowerConstrainedMap(const double value);
    double upperConstrainedMap(const double value);

private:
    double _in_min, _in_max, _out_min, _out_max;
    double _factor, _base;
    double _backfactor, _backbase;
};



// -- END OF FILE --