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# 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

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().

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::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 &().

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().

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::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().

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

| Returns: true, if minValue() >= maxValue() Definition at line 194 of file qwt_double_interval.h.

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

| Returns: true, if minValue() <= maxValue() Definition at line 200 of file qwt_double_interval.h. Referenced by QwtLinearColorMap::colorIndex(), QwtColorMap::colorTable(), QwtScaleEngine::contains(), contains(), QwtRasterData::contourLines(), extend(), intersect(), intersects(), limited(), normalized(), QwtAlphaColorMap::rgb(), QwtScaleEngine::strip(), symmetrize(), unite(), and width().

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().

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(), QwtAbstractScale::setScale(), and unite().

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(), QwtAbstractScale::setScale(), and unite().

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::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().

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

| Compare two intervals. Definition at line 179 of file qwt_double_interval.h.

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.

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().

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().

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().

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().

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().

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().

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|().

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().