QwtInterval(3) Qwt User's Guide QwtInterval(3)

QwtInterval - A class representing an interval.

#include <qwt_interval.h>


enum BorderFlag { IncludeBorders = 0x00, ExcludeMinimum = 0x01, ExcludeMaximum = 0x02, ExcludeBorders = ExcludeMinimum | ExcludeMaximum }
typedef QFlags< BorderFlag > BorderFlags
Border flags.


QwtInterval ()
Default Constructor. QwtInterval (double minValue, double maxValue, BorderFlags=IncludeBorders)
void setInterval (double minValue, double maxValue, BorderFlags=IncludeBorders)
QwtInterval normalized () const
Normalize the limits of the interval. QwtInterval inverted () const
QwtInterval limited (double lowerBound, double upperBound) const
bool operator== (const QwtInterval &) const
Compare two intervals. bool operator!= (const QwtInterval &) const
Compare two intervals. void setBorderFlags (BorderFlags)
BorderFlags borderFlags () const
double minValue () const
double maxValue () const
double width () const
Return the width of an interval. void setMinValue (double)
void setMaxValue (double)
bool contains (double value) const
bool intersects (const QwtInterval &) const
Test if two intervals overlap. QwtInterval intersect (const QwtInterval &) const
Intersect 2 intervals. QwtInterval unite (const QwtInterval &) const
Unite 2 intervals. QwtInterval operator| (const QwtInterval &) const
QwtInterval operator & (const QwtInterval &) const
QwtInterval & operator|= (const QwtInterval &)
Unite this interval with the given interval. QwtInterval & operator &= (const QwtInterval &)
QwtInterval extend (double value) const
Extend the interval. QwtInterval operator| (double) const
QwtInterval & operator|= (double)
bool isValid () const
bool isNull () const
void invalidate ()
QwtInterval symmetrize (double value) 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 or excluded

See also:

setBorderFlags(), borderFlags()

Enumerator

Min/Max values are inside the interval.
Min value is not included in the interval.
Max value is not included in the interval.
Min/Max values are not included in the interval.

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

QwtInterval::BorderFlags QwtInterval::borderFlags () const [inline]

Returns:

Border flags

See also:

setBorderFlags()

Test if a value is inside an interval

Parameters:

value Value

Returns:

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

QwtInterval QwtInterval::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

Returns:

extended interval

See also:

isValid()

QwtInterval QwtInterval::intersect (const QwtInterval & other) const

Intersect 2 intervals.

Parameters:

other Interval to be intersect with

Returns:

Intersection

Test if two intervals overlap.

Parameters:

other Interval

Returns:

True, when the intervals are intersecting

Invalidate the interval

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

See also:

isValid()

QwtInterval QwtInterval::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 QwtInterval::ExcludeBorders it is true when minValue() < maxValue()

Returns:

True, when the interval is valid

QwtInterval QwtInterval::limited (double lowerBound, double upperBound) 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

QwtInterval QwtInterval::normalized () const

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

Returns:

Normalized interval

See also:

isValid(), inverted()

Compare two intervals.

Parameters:

other Interval to compare with

Returns:

True, when this and other are not equal

Compare two intervals.

Parameters:

other Interval to compare with

Returns:

True, when this and other are equal

QwtInterval QwtInterval::operator| (const QwtInterval & other) const [inline]

Union of two intervals

Parameters:

other Interval to unite with

Returns:

Union of this and other

See also:

unite()

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

Extend an interval

Parameters:

value Value

Returns:

Extended interval

See also:

extend()

QwtInterval & QwtInterval::operator|= (const QwtInterval & other)

Unite this interval with the given interval.

Parameters:

other Interval to be united with

Returns:

This interval

QwtInterval & QwtInterval::operator|= (double value)

Extend an interval

Parameters:

value Value

Returns:

Reference of the extended 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

QwtInterval QwtInterval::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

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

Returns:

Interval width

See also:

isValid()

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Wed Jan 2 2019 Version 6.1.4