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