qwt_interval.h

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/******************************************************************************
 * Qwt Widget Library
 * Copyright (C) 1997   Josef Wilgen
 * Copyright (C) 2002   Uwe Rathmann
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the Qwt License, Version 1.0
 *****************************************************************************/

#ifndef QWT_INTERVAL_H
#define QWT_INTERVAL_H

#include "qwt_global.h"
#include <qmetatype.h>

class QWT_EXPORT QwtInterval
{
  public:
    enum BorderFlag
    {
        IncludeBorders = 0x00,

        ExcludeMinimum = 0x01,

        ExcludeMaximum = 0x02,

        ExcludeBorders = ExcludeMinimum | ExcludeMaximum
    };

    Q_DECLARE_FLAGS( BorderFlags, BorderFlag )

    QwtInterval();
    QwtInterval( double minValue, double maxValue,
        BorderFlags = IncludeBorders );

    void setInterval( double minValue, double maxValue,
        BorderFlags = IncludeBorders );

    QwtInterval normalized() const;
    QwtInterval inverted() const;
    QwtInterval limited( double lowerBound, double upperBound ) const;

    bool operator==( const QwtInterval& ) const;
    bool operator!=( const QwtInterval& ) const;

    void setBorderFlags( BorderFlags );
    BorderFlags borderFlags() const;

    double minValue() const;
    double maxValue() const;

    double width() const;
    long double widthL() const;

    void setMinValue( double );
    void setMaxValue( double );

    bool contains( double value ) const;
    bool contains( const QwtInterval& ) const;

    bool intersects( const QwtInterval& ) const;
    QwtInterval intersect( const QwtInterval& ) const;
    QwtInterval unite( const QwtInterval& ) const;

    QwtInterval operator|( const QwtInterval& ) const;
    QwtInterval operator&( const QwtInterval& ) const;

    QwtInterval& operator|=( const QwtInterval& );
    QwtInterval& operator&=( const QwtInterval& );

    QwtInterval extend( double value ) const;
    QwtInterval operator|( double ) const;
    QwtInterval& operator|=( double );

    bool isValid() const;
    bool isNull() const;
    void invalidate();

    QwtInterval symmetrize( double value ) const;

  private:
    double m_minValue;
    double m_maxValue;
    BorderFlags m_borderFlags;
};

Q_DECLARE_OPERATORS_FOR_FLAGS( QwtInterval::BorderFlags )
Q_DECLARE_METATYPE( QwtInterval )
Q_DECLARE_TYPEINFO( QwtInterval, Q_MOVABLE_TYPE );

inline QwtInterval::QwtInterval()
    : m_minValue( 0.0 )
    , m_maxValue( -1.0 )
    , m_borderFlags( IncludeBorders )
{
}

inline QwtInterval::QwtInterval(
        double minValue, double maxValue, BorderFlags borderFlags )
    : m_minValue( minValue )
    , m_maxValue( maxValue )
    , m_borderFlags( borderFlags )
{
}

inline void QwtInterval::setInterval(
    double minValue, double maxValue, BorderFlags borderFlags )
{
    m_minValue = minValue;
    m_maxValue = maxValue;
    m_borderFlags = borderFlags;
}

inline void QwtInterval::setBorderFlags( BorderFlags borderFlags )
{
    m_borderFlags = borderFlags;
}

inline QwtInterval::BorderFlags QwtInterval::borderFlags() const
{
    return m_borderFlags;
}

inline void QwtInterval::setMinValue( double minValue )
{
    m_minValue = minValue;
}

inline void QwtInterval::setMaxValue( double maxValue )
{
    m_maxValue = maxValue;
}

inline double QwtInterval::minValue() const
{
    return m_minValue;
}

inline double QwtInterval::maxValue() const
{
    return m_maxValue;
}

inline bool QwtInterval::isValid() const
{
    if ( ( m_borderFlags & ExcludeBorders ) == 0 )
        return m_minValue <= m_maxValue;
    else
        return m_minValue < m_maxValue;
}

inline double QwtInterval::width() const
{
    return isValid() ? ( m_maxValue - m_minValue ) : 0.0;
}

inline long double QwtInterval::widthL() const
{
    if ( !isValid() )
        return 0.0;

    return static_cast< long double >( m_maxValue )
           - static_cast< long double >( m_minValue );
}

inline QwtInterval QwtInterval::operator&(
    const QwtInterval& other ) const
{
    return intersect( other );
}

inline QwtInterval QwtInterval::operator|(
    const QwtInterval& other ) const
{
    return unite( other );
}

inline bool QwtInterval::operator==( const QwtInterval& other ) const
{
    return ( m_minValue == other.m_minValue ) &&
           ( m_maxValue == other.m_maxValue ) &&
           ( m_borderFlags == other.m_borderFlags );
}
inline bool QwtInterval::operator!=( const QwtInterval& other ) const
{
    return ( !( *this == other ) );
}

inline QwtInterval QwtInterval::operator|( double value ) const
{
    return extend( value );
}

inline bool QwtInterval::isNull() const
{
    return isValid() && m_minValue >= m_maxValue;
}

inline void QwtInterval::invalidate()
{
    m_minValue = 0.0;
    m_maxValue = -1.0;
}

#ifndef QT_NO_DEBUG_STREAM
QWT_EXPORT QDebug operator<<( QDebug, const QwtInterval& );
#endif

#endif