QwtDoubleInterval(3)

NAME
QwtDoubleInterval - A class representing an interval.

SYNOPSIS

#include <qwt_double_interval.h>

  Public Types
enum BorderMode { IncludeBorders = 0, ExcludeMinimum = 1, ExcludeMaximum = 2, ExcludeBorders = ExcludeMinimum | ExcludeMaximum }

  Public Member Functions
QwtDoubleInterval ()
QwtDoubleInterval (double minValue, double maxValue, int borderFlags=IncludeBorders)
void setInterval (double minValue, double maxValue, int borderFlags=IncludeBorders)
QwtDoubleInterval normalized () const
QwtDoubleInterval inverted () const
QwtDoubleInterval limited (double minValue, double maxValue) const
int operator== (const QwtDoubleInterval &) const
int operator!= (const QwtDoubleInterval &) const
void setBorderFlags (int)
int 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 QwtDoubleInterval &) const
QwtDoubleInterval intersect (const QwtDoubleInterval &) const
QwtDoubleInterval unite (const QwtDoubleInterval &) const
QwtDoubleInterval operator| (const QwtDoubleInterval &) const
QwtDoubleInterval operator& (const QwtDoubleInterval &) const
QwtDoubleInterval & operator|= (const QwtDoubleInterval &)
QwtDoubleInterval & operator&= (const QwtDoubleInterval &)
QwtDoubleInterval extend (double value) const
QwtDoubleInterval operator| (double) const
QwtDoubleInterval & operator|= (double)
bool isValid () const
bool isNull () const
void invalidate ()
QwtDoubleInterval symmetrize (double value) const

Detailed Description

A class representing an interval. The interval is represented by 2 doubles, the lower and the upper limit.

Member Enumeration Documentation

  enum QwtDoubleInterval::BorderMode

Flag indicating if a border is included/excluded from an interval

•   IncludeBorders
     min/max values are inside the interval

•   ExcludeMinimum
     min value is not included in the interval

•   ExcludeMaximum
     max value is not included in the interval

•   ExcludeBorders
     min/max values are not included in the interval

See also:
    setBorderMode(), testBorderMode()

Constructor & Destructor Documentation

  QwtDoubleInterval::QwtDoubleInterval () [inline]

Default Constructor.

Creates an invalid interval [0.0, -1.0]

See also:
    setInterval(), isValid()

  QwtDoubleInterval::QwtDoubleInterval (double minValue, double maxValue, int borderFlags = IncludeBorders) [inline]

Constructor

Build an interval with from min/max values

Parameters:
    minValue Minimum value
    maxValue Maximum value
    borderFlags Include/Exclude borders

Member Function Documentation

  int QwtDoubleInterval::borderFlags () const [inline]

Returns:
    Border flags

See also:
    setBorderFlags()

  bool QwtDoubleInterval::contains (double value) const

Test if a value is inside an interval

Parameters:
    value Value

Returns:
    true, if value >= minValue() && value <= maxValue()

  QwtDoubleInterval QwtDoubleInterval::extend (double value) const

Extend the interval

If value is below minValue, value becomes the lower limit. If value is above maxValue, value becomes the upper limit.

extend has no effect for invalid intervals

Parameters:
    value Value

See also:
    isValid()

  QwtDoubleInterval QwtDoubleInterval::intersect (const QwtDoubleInterval & other) const

Intersect 2 intervals.

  bool QwtDoubleInterval::intersects (const QwtDoubleInterval & other) const

Test if two intervals overlap

  void QwtDoubleInterval::invalidate () [inline]

Invalidate the interval

The limits are set to interval [0.0, -1.0]

See also:
    isValid()

  QwtDoubleInterval QwtDoubleInterval::inverted () const

Invert the limits of the interval

Returns:
    Inverted interval

See also:
    normalized()

  bool QwtDoubleInterval::isNull () const [inline]

Returns:
    true, if isValid() && (minValue() >= maxValue())

  bool QwtDoubleInterval::isValid () const [inline]

A interval is valid when minValue() <= maxValue(). In case of QwtDoubleInterval::ExcludeBorders it is true when minValue() < maxValue()

  QwtDoubleInterval QwtDoubleInterval::limited (double lowerBound, double upperBound) const

Limit the interval, keeping the border modes

Parameters:
    lowerBound Lower limit
    upperBound Upper limit

Returns:
    Limited interval

  double QwtDoubleInterval::maxValue () const [inline]

Returns:
    Upper limit of the interval

  double QwtDoubleInterval::minValue () const [inline]

Returns:
    Lower limit of the interval

  QwtDoubleInterval QwtDoubleInterval::normalized () const

Normalize the limits of the interval.

If maxValue() < minValue() the limits will be inverted.

Returns:
    Normalized interval

See also:
    isValid(), inverted()

  int QwtDoubleInterval::operator!= (const QwtDoubleInterval & other) const [inline]

Compare two intervals.

  QwtDoubleInterval QwtDoubleInterval::operator& (const QwtDoubleInterval & interval) const [inline]

Intersection of two intervals

See also:
    intersect()

  QwtDoubleInterval & QwtDoubleInterval::operator&= (const QwtDoubleInterval & interval)

Intersects this interval with the given interval.

  int QwtDoubleInterval::operator== (const QwtDoubleInterval & other) const [inline]

Compare two intervals.

  QwtDoubleInterval QwtDoubleInterval::operator| (double value) const [inline]

Extend an interval

See also:
    extend()

  QwtDoubleInterval QwtDoubleInterval::operator| (const QwtDoubleInterval & interval) const [inline]

Union of two intervals

See also:
    unite()

  QwtDoubleInterval & QwtDoubleInterval::operator|= (const QwtDoubleInterval & interval)

Unites this interval with the given interval.

  void QwtDoubleInterval::setBorderFlags (int borderFlags) [inline]

Change the border flags

Parameters:
    borderFlags Or'd BorderMode flags

See also:
    borderFlags()

  void QwtDoubleInterval::setInterval (double minValue, double maxValue, int borderFlags = IncludeBorders) [inline]

Assign the limits of the interval

Parameters:
    minValue Minimum value
    maxValue Maximum value
    borderFlags Include/Exclude borders

  void QwtDoubleInterval::setMaxValue (double maxValue) [inline]

Assign the upper limit of the interval

Parameters:
    maxValue Maximum value

  void QwtDoubleInterval::setMinValue (double minValue) [inline]

Assign the lower limit of the interval

Parameters:
    minValue Minimum value

  QwtDoubleInterval QwtDoubleInterval::symmetrize (double value) const

Adjust the limit that is closer to value, so that value becomes the center of the interval.

Parameters:
    value Center

Returns:
    Interval with value as center

  QwtDoubleInterval QwtDoubleInterval::unite (const QwtDoubleInterval & other) const

Unite 2 intervals.

  double QwtDoubleInterval::width () const [inline]

Return the width of an interval The width of invalid intervals is 0.0, otherwise the result is maxValue() - minValue().

See also:
    isValid()

Author

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