qwt_interval.h

/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
 * 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"
#ifndef QT_NO_DEBUG_STREAM
#include <qdebug.h>
#endif

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

        ExcludeMinimum = 0x01,

        ExcludeMaximum = 0x02,

        ExcludeBorders = ExcludeMinimum | ExcludeMaximum
    };

    typedef QFlags<BorderFlag> BorderFlags;

    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 minValue, double maxValue ) 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;

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

    bool contains( double value ) 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 d_minValue;
    double d_maxValue;
    BorderFlags d_borderFlags;
};

Q_DECLARE_TYPEINFO(QwtInterval, Q_MOVABLE_TYPE);

inline QwtInterval::QwtInterval():
    d_minValue( 0.0 ),
    d_maxValue( -1.0 ),
    d_borderFlags( IncludeBorders )
{
}

inline QwtInterval::QwtInterval(
        double minValue, double maxValue, BorderFlags borderFlags ):
    d_minValue( minValue ),
    d_maxValue( maxValue ),
    d_borderFlags( borderFlags )
{
}

inline void QwtInterval::setInterval(
    double minValue, double maxValue, BorderFlags borderFlags )
{
    d_minValue = minValue;
    d_maxValue = maxValue;
    d_borderFlags = borderFlags;
}

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

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

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

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

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

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

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

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

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

inline bool QwtInterval::operator==( const QwtInterval &other ) const
{
    return ( d_minValue == other.d_minValue ) &&
           ( d_maxValue == other.d_maxValue ) &&
           ( d_borderFlags == other.d_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() && d_minValue >= d_maxValue;
}

inline bool QwtInterval::isValid() const
{
    if ( ( d_borderFlags & ExcludeBorders ) == 0 )
        return d_minValue <= d_maxValue;
    else
        return d_minValue < d_maxValue;
}

inline void QwtInterval::invalidate()
{
    d_minValue = 0.0;
    d_maxValue = -1.0;
}

Q_DECLARE_OPERATORS_FOR_FLAGS( QwtInterval::BorderFlags )

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

#endif