# QwtDoubleInterval Class Reference

List of all members.

## Detailed Description

A class representing an interval.

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

Definition at line 21 of file qwt_double_interval.h.

## Public Member Functions

| QwtDoubleInterval ()
| QwtDoubleInterval (double minValue, double maxValue)
void | setInterval (double minValue, double maxValue)
QwtDoubleInterval | normalized () const
QwtDoubleInterval | inverted () const
QwtDoubleInterval | limited (double minValue, double maxValue) const
int | operator== (const QwtDoubleInterval &) const
int | operator!= (const QwtDoubleInterval &) 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

## Constructor & Destructor Documentation

QwtDoubleInterval::QwtDoubleInterval | ( |  | ) | `[inline]`

Default Constructor.

Creates an invalid interval [0.0, -1.0]

See also:
  setInterval, isValid

Definition at line 77 of file qwt_double_interval.h.

Referenced by extend(), intersect(), inverted(), limited(), normalized(), symmetrize(), and unite().

QwtDoubleInterval::QwtDoubleInterval | ( | double | minValue,
|  | double | maxValue |
| ) |  |  | `[inline]`

Constructor

Parameters:

  | minValue | Minimum value
  | maxValue | Maximum value

Definition at line 89 of file qwt_double_interval.h.

## Member Function Documentation

void QwtDoubleInterval::setInterval | ( | double | minValue,
|  | double | maxValue |
| ) |  |  | `[inline]`

Assign the limits of the interval

Parameters:

  | minValue | Minimum value
  | maxValue | Maximum value

Definition at line 101 of file qwt_double_interval.h.

Referenced by QwtLog10ScaleEngine::autoScale().

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

Definition at line 28 of file qwt_double_interval.cpp.

References isValid(), and QwtDoubleInterval().

Referenced by QwtLinearScaleEngine::autoScale(), and QwtLog10ScaleEngine::divideScale().

QwtDoubleInterval QwtDoubleInterval::inverted | ( |  | ) | const

Invert the limits of the interval

Returns:
  Inverted interval

See also:
  normalized

Definition at line 43 of file qwt_double_interval.cpp.

References QwtDoubleInterval().

QwtDoubleInterval QwtDoubleInterval::limited | ( | double | lBound,
|  | double | hBound |
| ) |  |  | const

Limit the interval

Parameters:

  | lBound | Lower limit
  | hBound | Upper limit

Returns:
  Limited interval

Definition at line 159 of file qwt_double_interval.cpp.

References isValid(), maxValue(), minValue(), and QwtDoubleInterval().

Referenced by QwtLog10ScaleEngine::autoScale(), and QwtLog10ScaleEngine::divideScale().

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

Compare two intervals.

Definition at line 172 of file qwt_double_interval.h.

References d_maxValue, and d_minValue.

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

Compare two intervals.

Definition at line 179 of file qwt_double_interval.h.

double QwtDoubleInterval::minValue | ( |  | ) | const`[inline]`

Returns:
  Lower limit of the interval

Definition at line 128 of file qwt_double_interval.h.

Referenced by QwtLinearScaleEngine::align(), QwtLog10ScaleEngine::autoScale(), QwtLinearScaleEngine::autoScale(), QwtLinearColorMap::colorIndex(), QwtColorMap::colorTable(), QwtScaleEngine::contains(), QwtLog10ScaleEngine::divideScale(), intersect(), intersects(), limited(), QwtLog10ScaleEngine::log10(), QwtLog10ScaleEngine::pow10(), QwtAlphaColorMap::rgb(), QwtLinearColorMap::rgb(), QwtScaleDiv::setInterval(), QwtAbstractScale::setScale(), unite(), and QwtPlot::updateAxes().

double QwtDoubleInterval::maxValue | ( |  | ) | const`[inline]`

Returns:
  Upper limit of the interval

Definition at line 134 of file qwt_double_interval.h.

Referenced by QwtLinearScaleEngine::align(), QwtLog10ScaleEngine::autoScale(), QwtLinearScaleEngine::autoScale(), QwtLinearColorMap::colorIndex(), QwtScaleEngine::contains(), QwtLog10ScaleEngine::divideScale(), intersect(), intersects(), limited(), QwtLog10ScaleEngine::log10(), QwtLog10ScaleEngine::pow10(), QwtScaleDiv::setInterval(), QwtAbstractScale::setScale(), unite(), and QwtPlot::updateAxes().

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

Definition at line 146 of file qwt_double_interval.h.

References isValid().

Referenced by QwtLog10ScaleEngine::autoScale(), QwtLinearScaleEngine::autoScale(), QwtLinearColorMap::colorIndex(), QwtColorMap::colorTable(), QwtScaleEngine::contains(), QwtLog10ScaleEngine::divideScale(), QwtLinearScaleEngine::divideScale(), QwtAlphaColorMap::rgb(), and QwtLinearColorMap::rgb().

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

Assign the lower limit of the interval

Parameters:

  | minValue | Minimum value

Definition at line 112 of file qwt_double_interval.h.

Referenced by QwtLinearScaleEngine::autoScale().

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

Assign the upper limit of the interval

Parameters:

  | maxValue | Maximum value

Definition at line 122 of file qwt_double_interval.h.

Referenced by QwtLinearScaleEngine::autoScale().

bool QwtDoubleInterval::contains | ( | double | value | ) | const

Test if a value is inside an interval

Parameters:

  | value | Value

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

Definition at line 54 of file qwt_double_interval.cpp.

References isValid().

Referenced by QwtRasterData::contourLines().

bool QwtDoubleInterval::intersects | ( | const QwtDoubleInterval & | interval | ) | const

Test if two intervals overlap

Definition at line 119 of file qwt_double_interval.cpp.

References isValid(), maxValue(), and minValue().

QwtDoubleInterval QwtDoubleInterval::intersect | ( | const QwtDoubleInterval & |  | ) | const

Intersect 2 intervals.

Definition at line 83 of file qwt_double_interval.cpp.

References isValid(), maxValue(), minValue(), and QwtDoubleInterval().

Referenced by operator &().

QwtDoubleInterval QwtDoubleInterval::unite | ( | const QwtDoubleInterval & |  | ) | const

Unite 2 intervals.

Definition at line 63 of file qwt_double_interval.cpp.

References isValid(), maxValue(), minValue(), and QwtDoubleInterval().

Referenced by operator|().

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

Union of two intervals

See also:
  unite

Definition at line 165 of file qwt_double_interval.h.

References unite().

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

Intersection of two intervals

See also:
  intersect

Definition at line 155 of file qwt_double_interval.h.

References intersect().

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

Definition at line 185 of file qwt_double_interval.cpp.

References isValid(), and QwtDoubleInterval().

Referenced by QwtLog10ScaleEngine::autoScale(), QwtLinearScaleEngine::autoScale(), and operator|().

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

Extend an interval

See also:
  extend

Definition at line 188 of file qwt_double_interval.h.

References extend().

bool QwtDoubleInterval::isValid | ( |  | ) | const`[inline]`

Returns:
  true, if minValue() <= maxValue()

Definition at line 200 of file qwt_double_interval.h.

Referenced by QwtColorMap::colorTable(), QwtScaleEngine::contains(), contains(), QwtRasterData::contourLines(), extend(), intersect(), intersects(), limited(), normalized(), QwtScaleEngine::strip(), symmetrize(), unite(), QwtPlot::updateAxes(), and width().

bool QwtDoubleInterval::isNull | ( |  | ) | const`[inline]`

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

Definition at line 194 of file qwt_double_interval.h.

void QwtDoubleInterval::invalidate | ( |  | ) | `[inline]`

Invalidate the interval

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

See also:
  isValid

Definition at line 211 of file qwt_double_interval.h.

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

Definition at line 140 of file qwt_double_interval.cpp.

References isValid(), and QwtDoubleInterval().

Referenced by QwtLinearScaleEngine::autoScale().