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#ifndef SCIQLOP_OPTIONALAXIS_H
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#define SCIQLOP_OPTIONALAXIS_H
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#include "CoreGlobal.h"
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#include "Unit.h"
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#include <memory>
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template <int Dim>
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class ArrayData;
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/**
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* @brief The OptionalAxis class defines an optional data axis for a series of data.
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*
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* An optional data axis is an axis that can be defined or not for a data series. If defined, it
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* contains a unit and data (1-dim ArrayData). It is then possible to access the data or the unit.
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* In the case of an undefined axis, the axis has no data and no unit. The methods for accessing the
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* data or the unit are always callable but will return undefined values.
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*
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* @sa DataSeries
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* @sa ArrayData
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*/
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class SCIQLOP_CORE_EXPORT OptionalAxis {
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public:
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/// Ctor for an undefined axis
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explicit OptionalAxis();
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/// Ctor for a defined axis
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/// @param data the axis' data
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/// @param unit the axis' unit
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/// @throws std::invalid_argument if no data is associated to the axis
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explicit OptionalAxis(std::shared_ptr<ArrayData<1> > data, Unit unit);
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/// Copy ctor
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OptionalAxis(const OptionalAxis &other);
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/// Assignment operator
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OptionalAxis &operator=(OptionalAxis other);
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/// @return the flag that indicates if the axis is defined or not
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bool isDefined() const;
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/// @return gets the data at the index passed in parameter, NaN if the index is outside the
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/// bounds of the axis, or if the axis is undefined
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double at(int index) const;
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///@return the min and max values of the data on the axis, NaN values if there is no data
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std::pair<double, double> bounds() const;
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/// @return the number of data on the axis, 0 if the axis is not defined
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int size() const;
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/// @return the unit of the axis, an empty unit if the axis is not defined
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Unit unit() const;
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bool operator==(const OptionalAxis &other);
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bool operator!=(const OptionalAxis &other);
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private:
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bool m_Defined; ///< Axis is defined or not
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std::shared_ptr<ArrayData<1> > m_Data; ///< Axis' data
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Unit m_Unit; ///< Axis' unit
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};
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#endif // SCIQLOP_OPTIONALAXIS_H
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