QCPRange Class Reference

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

Public Member Functions
	QCPRange ()
	QCPRange (double lower, double upper)
double	size () const
double	center () const
void	normalize ()
void	expand (const QCPRange &otherRange)
QCPRange	expanded (const QCPRange &otherRange) const
QCPRange	sanitizedForLogScale () const
QCPRange	sanitizedForLinScale () const
bool	contains (double value) const

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

Public Attributes
double	lower
double	upper

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

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::QCPRange

(

)

Constructs a range with lower and upper set to zero.

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.

Member Function Documentation

double QCPRange::center

(

)

const

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

bool QCPRange::contains

(

double

value

)

const

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

void QCPRange::expand

(

const QCPRange &

otherRange

)

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

See also

expanded

QCPRange QCPRange::expanded

(

const QCPRange &

otherRange

)

const

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

See also

expand

void QCPRange::normalize

(

)

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

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.

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.

double QCPRange::size

(

)

const

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

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

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

Member Data Documentation

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. Since the number of planck-volumes in the entire visible universe is only ~1e183, this should be enough.

See also

validRange, 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.

See also

validRange, maxRange

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

• qcustomplot.h
• qcustomplot.cpp