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321 lines
7.0 KiB
C++
321 lines
7.0 KiB
C++
/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
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* Qwt Widget Library
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* Copyright (C) 1997 Josef Wilgen
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* Copyright (C) 2002 Uwe Rathmann
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the Qwt License, Version 1.0
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*****************************************************************************/
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#ifndef QWT_INTERVAL_H
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#define QWT_INTERVAL_H
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#include "qwt_global.h"
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#include <qmetatype.h>
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#ifndef QT_NO_DEBUG_STREAM
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#include <qdebug.h>
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#endif
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/*!
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\brief A class representing an interval
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The interval is represented by 2 doubles, the lower and the upper limit.
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*/
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class QWT_EXPORT QwtInterval
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{
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public:
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/*!
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Flag indicating if a border is included or excluded
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\sa setBorderFlags(), borderFlags()
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*/
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enum BorderFlag
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{
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//! Min/Max values are inside the interval
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IncludeBorders = 0x00,
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//! Min value is not included in the interval
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ExcludeMinimum = 0x01,
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//! Max value is not included in the interval
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ExcludeMaximum = 0x02,
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//! Min/Max values are not included in the interval
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ExcludeBorders = ExcludeMinimum | ExcludeMaximum
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};
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//! Border flags
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typedef QFlags<BorderFlag> BorderFlags;
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QwtInterval();
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QwtInterval( double minValue, double maxValue,
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BorderFlags = IncludeBorders );
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void setInterval( double minValue, double maxValue,
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BorderFlags = IncludeBorders );
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QwtInterval normalized() const;
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QwtInterval inverted() const;
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QwtInterval limited( double lowerBound, double upperBound ) const;
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bool operator==( const QwtInterval & ) const;
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bool operator!=( const QwtInterval & ) const;
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void setBorderFlags( BorderFlags );
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BorderFlags borderFlags() const;
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double minValue() const;
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double maxValue() const;
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double width() const;
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void setMinValue( double );
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void setMaxValue( double );
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bool contains( double value ) const;
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bool intersects( const QwtInterval & ) const;
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QwtInterval intersect( const QwtInterval & ) const;
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QwtInterval unite( const QwtInterval & ) const;
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QwtInterval operator|( const QwtInterval & ) const;
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QwtInterval operator&( const QwtInterval & ) const;
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QwtInterval &operator|=( const QwtInterval & );
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QwtInterval &operator&=( const QwtInterval & );
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QwtInterval extend( double value ) const;
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QwtInterval operator|( double ) const;
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QwtInterval &operator|=( double );
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bool isValid() const;
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bool isNull() const;
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void invalidate();
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QwtInterval symmetrize( double value ) const;
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private:
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double d_minValue;
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double d_maxValue;
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BorderFlags d_borderFlags;
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};
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Q_DECLARE_TYPEINFO(QwtInterval, Q_MOVABLE_TYPE);
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/*!
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\brief Default Constructor
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Creates an invalid interval [0.0, -1.0]
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\sa setInterval(), isValid()
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*/
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inline QwtInterval::QwtInterval():
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d_minValue( 0.0 ),
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d_maxValue( -1.0 ),
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d_borderFlags( IncludeBorders )
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{
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}
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/*!
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Constructor
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Build an interval with from min/max values
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\param minValue Minimum value
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\param maxValue Maximum value
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\param borderFlags Include/Exclude borders
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*/
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inline QwtInterval::QwtInterval(
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double minValue, double maxValue, BorderFlags borderFlags ):
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d_minValue( minValue ),
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d_maxValue( maxValue ),
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d_borderFlags( borderFlags )
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{
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}
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/*!
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Assign the limits of the interval
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\param minValue Minimum value
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\param maxValue Maximum value
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\param borderFlags Include/Exclude borders
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*/
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inline void QwtInterval::setInterval(
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double minValue, double maxValue, BorderFlags borderFlags )
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{
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d_minValue = minValue;
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d_maxValue = maxValue;
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d_borderFlags = borderFlags;
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}
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/*!
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Change the border flags
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\param borderFlags Or'd BorderMode flags
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\sa borderFlags()
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*/
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inline void QwtInterval::setBorderFlags( BorderFlags borderFlags )
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{
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d_borderFlags = borderFlags;
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}
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/*!
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\return Border flags
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\sa setBorderFlags()
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*/
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inline QwtInterval::BorderFlags QwtInterval::borderFlags() const
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{
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return d_borderFlags;
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}
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/*!
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Assign the lower limit of the interval
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\param minValue Minimum value
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*/
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inline void QwtInterval::setMinValue( double minValue )
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{
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d_minValue = minValue;
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}
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/*!
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Assign the upper limit of the interval
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\param maxValue Maximum value
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*/
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inline void QwtInterval::setMaxValue( double maxValue )
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{
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d_maxValue = maxValue;
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}
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//! \return Lower limit of the interval
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inline double QwtInterval::minValue() const
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{
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return d_minValue;
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}
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//! \return Upper limit of the interval
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inline double QwtInterval::maxValue() const
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{
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return d_maxValue;
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}
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/*!
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A interval is valid when minValue() <= maxValue().
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In case of QwtInterval::ExcludeBorders it is true
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when minValue() < maxValue()
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\return True, when the interval is valid
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*/
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inline bool QwtInterval::isValid() const
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{
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if ( ( d_borderFlags & ExcludeBorders ) == 0 )
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return d_minValue <= d_maxValue;
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else
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return d_minValue < d_maxValue;
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}
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/*!
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\brief Return the width of an interval
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The width of invalid intervals is 0.0, otherwise the result is
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maxValue() - minValue().
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\return Interval width
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\sa isValid()
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*/
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inline double QwtInterval::width() const
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{
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return isValid() ? ( d_maxValue - d_minValue ) : 0.0;
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}
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/*!
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\brief Intersection of two intervals
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\param other Interval to intersect with
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\return Intersection of this and other
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\sa intersect()
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*/
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inline QwtInterval QwtInterval::operator&(
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const QwtInterval &other ) const
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{
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return intersect( other );
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}
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/*!
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Union of two intervals
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\param other Interval to unite with
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\return Union of this and other
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\sa unite()
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*/
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inline QwtInterval QwtInterval::operator|(
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const QwtInterval &other ) const
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{
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return unite( other );
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}
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/*!
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\brief Compare two intervals
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\param other Interval to compare with
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\return True, when this and other are equal
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*/
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inline bool QwtInterval::operator==( const QwtInterval &other ) const
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{
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return ( d_minValue == other.d_minValue ) &&
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( d_maxValue == other.d_maxValue ) &&
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( d_borderFlags == other.d_borderFlags );
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}
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/*!
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\brief Compare two intervals
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\param other Interval to compare with
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\return True, when this and other are not equal
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*/
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inline bool QwtInterval::operator!=( const QwtInterval &other ) const
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{
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return ( !( *this == other ) );
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}
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/*!
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Extend an interval
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\param value Value
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\return Extended interval
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\sa extend()
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*/
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inline QwtInterval QwtInterval::operator|( double value ) const
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{
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return extend( value );
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}
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//! \return true, if isValid() && (minValue() >= maxValue())
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inline bool QwtInterval::isNull() const
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{
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return isValid() && d_minValue >= d_maxValue;
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}
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/*!
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Invalidate the interval
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The limits are set to interval [0.0, -1.0]
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\sa isValid()
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*/
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inline void QwtInterval::invalidate()
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{
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d_minValue = 0.0;
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d_maxValue = -1.0;
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}
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Q_DECLARE_OPERATORS_FOR_FLAGS( QwtInterval::BorderFlags )
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Q_DECLARE_METATYPE( QwtInterval )
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#ifndef QT_NO_DEBUG_STREAM
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QWT_EXPORT QDebug operator<<( QDebug, const QwtInterval & );
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#endif
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#endif
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