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#ifndef SCALE_H
#define SCALE_H
#include <algorithm>
template<typename T>
class Scale
{
public:
Scale(const T &domainMin, const T &domainMax, const T &rangeMin, const T &rangeMax)
: m_domainMin(domainMin)
, m_domainMax(domainMax)
, m_rangeMin(rangeMin)
, m_rangeMax(rangeMax)
{
valuesUpdated();
}
virtual ~Scale() {}
T rangeMin() const { return m_rangeMin; }
T rangeMax() const { return m_rangeMax; }
T domainMin() const { return m_domainMin; }
T domainMax() const { return m_domainMax; }
void setRangeMin(T rangeMin) { m_rangeMin = rangeMin; valuesUpdated(); }
void setRangeMax(T rangeMax) { m_rangeMax = rangeMax; valuesUpdated(); }
void setDomainMin(T domainMin) { m_domainMin = domainMin; valuesUpdated(); }
void setDomainMax(T domainMax) { m_domainMax = domainMax; valuesUpdated(); }
void setRange(const T &rangeMin, const T &rangeMax)
{
m_rangeMin = rangeMin;
m_rangeMax = rangeMax;
valuesUpdated();
}
void setRange(const Scale<T> &other)
{
setRange(other.m_rangeMin, other.m_rangeMax);
}
void setDomain(const T &domainMin, const T &domainMax)
{
m_domainMin = domainMin;
m_domainMax = domainMax;
valuesUpdated();
}
void setDomain(const Scale<T> &other)
{
setDomain(other.m_domainMin, other.m_domainMax);
}
void inverse()
{
std::swap(m_rangeMin, m_domainMin);
std::swap(m_rangeMax, m_domainMax);
valuesUpdated();
}
virtual T operator()(const T &value) const = 0;
protected:
// Called when internal values change
virtual void valuesUpdated() {}
T m_domainMin, m_domainMax;
T m_rangeMin, m_rangeMax;
};
template<typename T>
class LinearScale
: public Scale<T>
{
public:
LinearScale(const T &domainMin, const T &domainMax, const T &rangeMin, const T &rangeMax)
: Scale<T>(domainMin, domainMax, rangeMin, rangeMax)
{
valuesUpdated();
}
virtual T operator()(const T &value) const
{
return (value - Scale<T>::m_domainMin) * m_transformSlope + Scale<T>::m_rangeMin;
}
T slope() const { return m_transformSlope; }
T offset() const
{
return Scale<T>::m_rangeMin - Scale<T>::m_domainMin * m_transformSlope;
}
protected:
virtual void valuesUpdated()
{
m_transformSlope = (Scale<T>::m_rangeMax - Scale<T>::m_rangeMin)
/ (Scale<T>::m_domainMax - Scale<T>::m_domainMin);
}
private:
T m_transformSlope;
};
#endif // SCALE_H
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