LookUp.h

/*
 
MIT License
 
Copyright (c) 2017 FMI Open Development / Markus Peura, first.last@fmi.fi
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 
*/
/*
Part of Rack development has been done in the BALTRAD projects part-financed
by the European Union (European Regional Development Fund and European
Neighbourhood Partnership Instrument, Baltic Sea Region Programme 2007-2013)
*/
/*
 * LookUp.h
 *
 *  Created on: Oct 23, 2012
 *      Author: mpeura
 */
 
#ifndef LOOKUP_H_
#define LOOKUP_H_
 
#include <drain/TypeName.h>
#include <drain/TypeUtils.h>
#include <cmath>
#include <vector>
#include <exception>
 
 
// // using namespace std;
 
namespace drain {
 
 
//  Works well...
template <class T>
class LookUp : public std::vector<T> {
 
public:
 
 
    int bitShift;
    int byteSize;
 
};
 
 
template <class T>
class LookUp2 : public std::vector<T> {
public:
 
    LookUp2(size_t size, double scale=1.0) : std::vector<T>(size), max(getScale()), scale(scale*static_cast<double>(max)), scaleInv(1.0/this->scale) {
        if (scale == 0.0)
            throw std::runtime_error("LookUp: scale=0.0 not allowed.");
        //init();
    } ; // if (size == 0) throw std::runtime_error("LookUp: undetectValue sized lookup not allowed.");
 
    virtual ~LookUp2(){};
 
    const T max;
 
    const double scale;
    const double scaleInv;
 
    double getScaled(size_t i) const {
        return scaleInv * (*this)[i];
    }
 
    void putScaled(size_t i, double value){
        (*this)[i] = scale * value;
    }
 
 
protected:
 
    static
    inline
    double getScale(){
        return Type::call<drain::typeIsInteger>(typeid(T)) ? Type::call<drain::typeMax,double>(typeid(T)) : 1.0;
    }
 
    /*
    virtual
    void init(){
        std::cerr << "Dammit, called base class" << std::endl;
    }
    */
 
};
 
 
template <class T, class F>  //=1.0, typename OFFSET=0.0>
class FunctorLookUp : public LookUp2<T> {
public:
 
    FunctorLookUp(size_t size, double scale, double scaleIndex = 1.0, double offsetIndex=0.0) : LookUp2<T>(size, scale), scaleIndex(scaleIndex), offsetIndex(offsetIndex) {
        init();
    };
 
    const double scaleIndex;
 
    const double offsetIndex;
 
protected:
 
    //virtual
    inline
    void init(){
        F functor;
        const size_t n = std::vector<T>::size();
        const double coeff = scaleIndex/static_cast<double>(n);
        for (size_t i=0; i<n; ++i)
            this->putScaled(i, functor(offsetIndex + coeff*static_cast<double>(i)));
    }
 
 
};
 
 
/*
template <class T>
class LookUpSin : public LookUp<T> {
public:
 
    LookUpSin(size_t size, double scale) : LookUp<T>(size, scale) {};
 
protected:
 
 
    virtual inline
    void init(){
        const size_t n = std::vector<T>::size();
        const double coeff = 2.0*M_PI / static_cast<double>(n);
        for (size_t i=0; i<n; ++i)
            this->putScaled(i, sin(coeff * i));
    }
 
};
 
template <class T>
class LookUpCos : public LookUp<T> {
public:
 
    LookUpCos(size_t size) : LookUp<T>(size) {};
 
protected:
 
    virtual inline
    void init(){
        const size_t n = std::vector<T>::size();
        const double coeff = 2.0 * M_PI / n;
        for (size_t i=0; i<n; ++i)
            (*this)[i] = cos(coeff * i);
    }
 
 
};
*/
 
/*
template <class T>
class LookUpATan : public LookUp<T> {
public:
    LookUpATan(size_t size) : LookUp<T>(size), _max(size-1) {
        const double coeff = 1.0 / _max;
        for (size_t i=0; i<=_max; ++i)
            (*this)[i] = std::atan2(coeff * i, 1.0);  // tan enough?
    };
 
    //template <class T2>
    double atan2(const double & y, const double & x) const {
 
        if (y < 0){
            return - this->atan2(-y, x);
        }
        // now y>=0
        else if (x < 0){
            return M_PI - this->atan2(y, -x);
        }
        else if (x == 0){
            //std::cout << "zerox\n";
            if (y == 0)
                return 0;  // TODO nan<T>;
            else
                return M_PI_2;
        }
        else if (y > x){
            //std::cout << "y>x\n";
            return M_PI_2 - this->atan2(x,y);
        }
        else {
            //std::cout << " final\n";
            return (*this)[ (_max*y)/x ];
        }
 
    }
 
protected:
    const size_t _max;
};
*/
 
 
}
 
#endif /* LOOKUP_H_ */
 
// Rack