DOKK / manpages / debian 10 / libqwt5-doc / QwtDoubleInterval.3.en
QwtDoubleInterval(3) Qwt User's Guide QwtDoubleInterval(3)

QwtDoubleInterval -

#include <qwt_double_interval.h>


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


QwtDoubleInterval ()
QwtDoubleInterval (double minValue, double maxValue, int borderFlags=IncludeBorders)
int borderFlags () const
bool contains (double value) const
QwtDoubleInterval extend (double value) const
QwtDoubleInterval intersect (const QwtDoubleInterval &) const
bool intersects (const QwtDoubleInterval &) const
void invalidate ()
QwtDoubleInterval inverted () const
bool isNull () const
bool isValid () const
QwtDoubleInterval limited (double minValue, double maxValue) const
double maxValue () const
double minValue () const
QwtDoubleInterval normalized () const
int operator!= (const QwtDoubleInterval &) const
QwtDoubleInterval operator& (const QwtDoubleInterval &) const
QwtDoubleInterval & operator&= (const QwtDoubleInterval &)
int operator== (const QwtDoubleInterval &) const
QwtDoubleInterval operator| (const QwtDoubleInterval &) const
QwtDoubleInterval operator| (double) const
QwtDoubleInterval & operator|= (const QwtDoubleInterval &)
QwtDoubleInterval & operator|= (double)
void setBorderFlags (int)
void setInterval (double minValue, double maxValue, int borderFlags=IncludeBorders)
void setMaxValue (double)
void setMinValue (double)
QwtDoubleInterval symmetrize (double value) const
QwtDoubleInterval unite (const QwtDoubleInterval &) const
double width () const

A class representing an interval.

The interval is represented by 2 doubles, the lower and the upper limit.

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()

Default Constructor. Creates an invalid interval [0.0, -1.0]

See also:

setInterval(), isValid()

Constructor

Build an interval with from min/max values

Parameters:

minValue Minimum value
maxValue Maximum value
borderFlags Include/Exclude borders

Returns:

Border flags

See also:

setBorderFlags()

Test if a value is inside an interval

Parameters:

value Value

Returns:

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

QwtDoubleInterval QwtDoubleInterval::extend (doublevalue) 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()

Test if two intervals overlap

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()

Returns:

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

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

QwtDoubleInterval QwtDoubleInterval::limited (doublelowerBound, doubleupperBound) const

Limit the interval, keeping the border modes

Parameters:

lowerBound Lower limit
upperBound Upper limit

Returns:

Limited interval

Returns:

Upper limit of the interval

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()

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

Intersection of two intervals

See also:

intersect()

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

Union of two intervals

See also:

unite()

QwtDoubleInterval QwtDoubleInterval::operator| (doublevalue) const [inline]

Extend an interval

See also:

extend()

Change the border flags

Parameters:

borderFlags Or'd BorderMode flags

See also:

borderFlags()

Assign the limits of the interval

Parameters:

minValue Minimum value
maxValue Maximum value
borderFlags Include/Exclude borders

Assign the upper limit of the interval

Parameters:

maxValue Maximum value

Assign the lower limit of the interval

Parameters:

minValue Minimum value

QwtDoubleInterval QwtDoubleInterval::symmetrize (doublevalue) 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

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

See also:

isValid()

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Tue Nov 20 2012 Version 5.2.3