QCPRange Class Reference

Public Member Functions
	QCPRange ()
	QCPRange (double lower, double upper)
QCPRange	bounded (double lowerBound, double upperBound) const
double	center () const
bool	contains (double value) const
void	expand (const QCPRange &otherRange)
void	expand (double includeCoord)
QCPRange	expanded (const QCPRange &otherRange) const
QCPRange	expanded (double includeCoord) const
void	normalize ()
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)
bool	operator== (const QCPRange &other) const
QCPRange	sanitizedForLinScale () const
QCPRange	sanitizedForLogScale () const
double	size () const

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

Public Attributes
double	lower
double	upper

Static Public Attributes
static const double	maxRange = 1e250
static const double	minRange = 1e-280

Related Functions
(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

Definition at line 774 of file qcustomplot.h.

Constructor & Destructor Documentation

QCPRange() [1/2]

QCPRange::QCPRange

(

)

Constructs a range with lower and upper set to zero.

Definition at line 1909 of file qcustomplot.cpp.

QCPRange() [2/2]

QCPRange::QCPRange	(	double	lower,
		double	upper
	)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

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.

Definition at line 1922 of file qcustomplot.cpp.

Member Function Documentation

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.

Definition at line 2012 of file qcustomplot.cpp.

center()

double QCPRange::center ( ) const

inline

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

Definition at line 797 of file qcustomplot.h.

contains()

bool QCPRange::contains ( double  value ) const

inline

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

Definition at line 806 of file qcustomplot.h.

expand() [1/2]

void QCPRange::expand

(

const QCPRange &

otherRange

)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

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

Definition at line 1941 of file qcustomplot.cpp.

expand() [2/2]

void QCPRange::expand

(

double

includeCoord

)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

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

Definition at line 1961 of file qcustomplot.cpp.

expanded() [1/2]

QCPRange QCPRange::expanded

(

const QCPRange &

otherRange

)

const

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

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

Definition at line 1980 of file qcustomplot.cpp.

expanded() [2/2]

QCPRange QCPRange::expanded

(

double

includeCoord

)

const

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

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

Definition at line 1997 of file qcustomplot.cpp.

normalize()

void QCPRange::normalize ( )

inline

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

Definition at line 798 of file qcustomplot.h.

operator*=()

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

inline

Multiplies both boundaries of the range by value.

Definition at line 787 of file qcustomplot.h.

operator+=()

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

inline

Adds value to both boundaries of the range.

Definition at line 785 of file qcustomplot.h.

operator-=()

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

inline

Subtracts value from both boundaries of the range.

Definition at line 786 of file qcustomplot.h.

operator/=()

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

inline

Divides both boundaries of the range by value.

Definition at line 788 of file qcustomplot.h.

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.

Definition at line 2096 of file qcustomplot.cpp.

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.

Definition at line 2047 of file qcustomplot.cpp.

size()

double QCPRange::size ( ) const

inline

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

Definition at line 796 of file qcustomplot.h.

validRange() [1/2]

bool QCPRange::validRange ( const QCPRange &  range )

static

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. 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

Definition at line 2130 of file qcustomplot.cpp.

validRange() [2/2]

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

Definition at line 2111 of file qcustomplot.cpp.

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.

Definition at line 820 of file qcustomplot.h.

Member Data Documentation

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

Definition at line 811 of file qcustomplot.h.

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

Definition at line 810 of file qcustomplot.h.

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

• qcustomplot.h
• qcustomplot.cpp