Provided by: libqwt-doc_6.1.3-1_all 
NAME
QwtInterval - A class representing an interval.
SYNOPSIS
#include <qwt_interval.h>
Public Types
enum BorderFlag { IncludeBorders = 0x00, ExcludeMinimum = 0x01, ExcludeMaximum = 0x02,
ExcludeBorders = ExcludeMinimum | ExcludeMaximum }
typedef QFlags< BorderFlag > BorderFlags
Border flags.
Public Member Functions
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 minValue, double maxValue) 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
Intersection of two intervals.
QwtInterval & operator|= (const QwtInterval &)
Unite this interval with the given interval.
QwtInterval & operator&= (const QwtInterval &)
Intersect this interval with the given interval.
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
Detailed Description
A class representing an interval.
The interval is represented by 2 doubles, the lower and the upper limit.
Member Enumeration Documentation
enum QwtInterval::BorderFlag
Flag indicating if a border is included or excluded
See also:
setBorderFlags(), borderFlags()
Enumerator
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.
Constructor & Destructor Documentation
QwtInterval::QwtInterval () [inline]
Default Constructor. Creates an invalid interval [0.0, -1.0]
See also:
setInterval(), isValid()
QwtInterval::QwtInterval (double minValue, double maxValue, BorderFlags 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
QwtInterval::BorderFlags QwtInterval::borderFlags () const [inline]
Returns:
Border flags
See also:
setBorderFlags()
bool QwtInterval::contains (double value) const
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
bool QwtInterval::intersects (const QwtInterval & other) const
Test if two intervals overlap.
Parameters:
other Interval
Returns:
True, when the intervals are intersecting
void QwtInterval::invalidate () [inline]
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()
bool QwtInterval::isNull () const [inline]
Returns:
true, if isValid() && (minValue() >= maxValue())
bool QwtInterval::isValid () const [inline]
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
double QwtInterval::maxValue () const [inline]
Returns:
Upper limit of the interval
double QwtInterval::minValue () const [inline]
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()
bool QwtInterval::operator!= (const QwtInterval & other) const [inline]
Compare two intervals.
Parameters:
other Interval to compare with
Returns:
True, when this and other are not equal
QwtInterval QwtInterval::operator& (const QwtInterval & other) const [inline]
Intersection of two intervals.
Parameters:
other Interval to intersect with
Returns:
Intersection of this and other
See also:
intersect()
QwtInterval & QwtInterval::operator&= (const QwtInterval & other)
Intersect this interval with the given interval.
Parameters:
other Interval to be intersected with
Returns:
This interval
bool QwtInterval::operator== (const QwtInterval & other) const [inline]
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()
void QwtInterval::setBorderFlags (BorderFlags borderFlags) [inline]
Change the border flags
Parameters:
borderFlags Or'd BorderMode flags
See also:
borderFlags()
void QwtInterval::setInterval (double minValue, double maxValue, BorderFlags borderFlags =
IncludeBorders) [inline]
Assign the limits of the interval
Parameters:
minValue Minimum value
maxValue Maximum value
borderFlags Include/Exclude borders
void QwtInterval::setMaxValue (double maxValue) [inline]
Assign the upper limit of the interval
Parameters:
maxValue Maximum value
void QwtInterval::setMinValue (double minValue) [inline]
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
double QwtInterval::width () const [inline]
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()
Author
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