QCPRange Class Reference
Author: Emanuel Eichhammer

· · · ·
Public Functions | Public Members | Static Public Functions | Static Public Members | Related Non-Members
QCPRange Class Reference

Represents the range an axis is encompassing. More...

## Public Functions
| QCPRange ()
| QCPRange (double lower, double upper)
bool | operator== (const QCPRange &other) const
bool | operator!= (const QCPRange &other) const
QCPRange & | operator+= (const double &value)
QCPRange & | operator-= (const double &value)
QCPRange & | operator*= (const double &value)
QCPRange & | operator/= (const double &value)
double | size () const
double | center () const
void | normalize ()
void | expand (const QCPRange &otherRange)
void | expand (double includeCoord)
QCPRange | expanded (const QCPRange &otherRange) const
QCPRange | expanded (double includeCoord) const
QCPRange | bounded (double lowerBound, double upperBound) const
QCPRange | sanitizedForLogScale () const
QCPRange | sanitizedForLinScale () const
bool | contains (double value) const

## Public Members
double | lower
double | upper

## Static Public Functions
static bool | validRange (double lower, double upper)
static bool | validRange (const QCPRange &range)

## Static Public Members
static const double | minRange = 1e-280
static const double | maxRange = 1e250

## Related Non-Members
(Note that these are not member functions.)
QDebug | operator<< (QDebug d, const QCPRange &range)

## Detailed Description

Represents the range an axis is encompassing.

contains a lower and upper double value and provides convenience input, output and modification functions.

See also
  QCPAxis::setRange

## Constructor & Destructor Documentation

## ◆ QCPRange() [1/2]

QCPRange::QCPRange | ( |  | ) |

Constructs a range with lower and upper set to zero.

## ◆ QCPRange() [2/2]

QCPRange::QCPRange | ( | double | lower,
|  | double | upper
| ) |  |

This is an overloaded function.
Constructs a range with the specified lower and upper values.

The resulting range will be normalized (see normalize), so if lower is not numerically smaller than upper, they will be swapped.

## Member Function Documentation

## ◆ operator+=()

QCPRange & QCPRange::operator+= | ( | const double & | value | ) |
| inline

Adds value to both boundaries of the range.

## ◆ operator-=()

QCPRange & QCPRange::operator-= | ( | const double & | value | ) |
| inline

Subtracts value from both boundaries of the range.

## ◆ operator*=()

QCPRange & QCPRange::operator*= | ( | const double & | value | ) |
| inline

Multiplies both boundaries of the range by value.

## ◆ operator/=()

QCPRange & QCPRange::operator/= | ( | const double & | value | ) |
| inline

Divides both boundaries of the range by value.

## ◆ size()

double QCPRange::size | ( |  | ) | const
| inline

Returns the size of the range, i.e. upper-lower

## ◆ center()

double QCPRange::center | ( |  | ) | const
| inline

Returns the center of the range, i.e. (upper+lower)*0.5

## ◆ normalize()

void QCPRange::normalize | ( |  | ) |
| inline

Makes sure lower is numerically smaller than upper. If this is not the case, the values are swapped.

## ◆ expand() [1/2]

void QCPRange::expand | ( | const QCPRange & | otherRange | ) |

This is an overloaded function.
Expands this range such that otherRange is contained in the new range. It is assumed that both this range and otherRange are normalized (see normalize).

If this range contains NaN as lower or upper bound, it will be replaced by the respective bound of otherRange.

If otherRange is already inside the current range, this function does nothing.

See also
  expanded

## ◆ expand() [2/2]

void QCPRange::expand | ( | double | includeCoord | ) |

This is an overloaded function.
Expands this range such that includeCoord is contained in the new range. It is assumed that this range is normalized (see normalize).

If this range contains NaN as lower or upper bound, the respective bound will be set to includeCoord.

If includeCoord is already inside the current range, this function does nothing.

See also
  expand

## ◆ expanded() [1/2]

QCPRange QCPRange::expanded | ( | const QCPRange & | otherRange | ) | const

This is an overloaded function.
Returns an expanded range that contains this and otherRange. It is assumed that both this range and otherRange are normalized (see normalize).

If this range contains NaN as lower or upper bound, the returned range's bound will be taken from otherRange.

See also
  expand

## ◆ expanded() [2/2]

QCPRange QCPRange::expanded | ( | double | includeCoord | ) | const

This is an overloaded function.
Returns an expanded range that includes the specified includeCoord. It is assumed that this range is normalized (see normalize).

If this range contains NaN as lower or upper bound, the returned range's bound will be set to includeCoord.

See also
  expand

## ◆ bounded()

QCPRange QCPRange::bounded | ( | double | lowerBound,
|  | double | upperBound
| ) |  | const

Returns this range, possibly modified to not exceed the bounds provided as lowerBound and upperBound. If possible, the size of the current range is preserved in the process.

If the range shall only be bounded at the lower side, you can set upperBound to QCPRange::maxRange. If it shall only be bounded at the upper side, set lowerBound to -QCPRange::maxRange.

## ◆ sanitizedForLogScale()

QCPRange QCPRange::sanitizedForLogScale | ( |  | ) | const

Returns a sanitized version of the range. Sanitized means for logarithmic scales, that the range won't span the positive and negative sign domain, i.e. contain zero. Further lower will always be numerically smaller (or equal) to upper.

If the original range does span positive and negative sign domains or contains zero, the returned range will try to approximate the original range as good as possible. If the positive interval of the original range is wider than the negative interval, the returned range will only contain the positive interval, with lower bound set to rangeFac or rangeFac *upper, whichever is closer to zero. Same procedure is used if the negative interval is wider than the positive interval, this time by changing the upper bound.

## ◆ sanitizedForLinScale()

QCPRange QCPRange::sanitizedForLinScale | ( |  | ) | const

Returns a sanitized version of the range. Sanitized means for linear scales, that lower will always be numerically smaller (or equal) to upper.

## ◆ contains()

bool QCPRange::contains | ( | double | value | ) | const
| inline

Returns true when value lies within or exactly on the borders of the range.

## ◆ validRange() [1/2]

bool QCPRange::validRange | ( | double | lower,
|  | double | upper
| ) |  |
| static

Checks, whether the specified range is within valid bounds, which are defined as QCPRange::maxRange and QCPRange::minRange. A valid range means:

- range bounds within -maxRange and maxRange
- range size above minRange
- range size below maxRange

## ◆ validRange() [2/2]

bool QCPRange::validRange | ( | const QCPRange & | range | ) |
| static

This is an overloaded function.
Checks, whether the specified range is within valid bounds, which are defined as QCPRange::maxRange and QCPRange::minRange. A valid range means:

- range bounds within -maxRange and maxRange
- range size above minRange
- range size below maxRange

## Field Documentation

## ◆ minRange

const double QCPRange::minRange = 1e-280
| static

Minimum range size (upper - lower) the range changing functions will accept. Smaller intervals would cause errors due to the 11-bit exponent of double precision numbers, corresponding to a minimum magnitude of roughly 1e-308.

Warning
  Do not use this constant to indicate "arbitrarily small" values in plotting logic (as values that will appear in the plot)! It is intended only as a bound to compare against, e.g. to prevent axis ranges from obtaining underflowing ranges.

See also
  validRange, maxRange

## ◆ maxRange

const double QCPRange::maxRange = 1e250
| static

Maximum values (negative and positive) the range will accept in range-changing functions. Larger absolute values would cause errors due to the 11-bit exponent of double precision numbers, corresponding to a maximum magnitude of roughly 1e308.

Warning
  Do not use this constant to indicate "arbitrarily large" values in plotting logic (as values that will appear in the plot)! It is intended only as a bound to compare against, e.g. to prevent axis ranges from obtaining overflowing ranges.

See also
  validRange, minRange

## Friends And Related Function Documentation

## ◆ operator<<()

QDebug operator<< | ( | QDebug | d,
|  | const QCPRange & | range
| ) |  |
| related

Prints range in a human readable format to the qDebug output.

The documentation for this class was generated from the following files:

- src/axis/range.h
- src/axis/range.cpp