QCPDataSelection Class Reference

Describes a data set by holding multiple QCPDataRange instances. More...

Public Member Functions
	QCPDataSelection ()
	QCPDataSelection (const QCPDataRange &range)
bool	operator== (const QCPDataSelection &other) const
bool	operator!= (const QCPDataSelection &other) const
QCPDataSelection &	operator+= (const QCPDataSelection &other)
QCPDataSelection &	operator+= (const QCPDataRange &other)
QCPDataSelection &	operator-= (const QCPDataSelection &other)
QCPDataSelection &	operator-= (const QCPDataRange &other)
int	dataRangeCount () const
int	dataPointCount () const
QCPDataRange	dataRange (int index=0) const
QList< QCPDataRange >	dataRanges () const
QCPDataRange	span () const
void	addDataRange (const QCPDataRange &dataRange, bool simplify=true)
void	clear ()
bool	isEmpty () const
void	simplify ()
void	enforceType (QCP::SelectionType type)
bool	contains (const QCPDataSelection &other) const
QCPDataSelection	intersection (const QCPDataRange &other) const
QCPDataSelection	intersection (const QCPDataSelection &other) const
QCPDataSelection	inverse (const QCPDataRange &outerRange) const

Friends
const QCPDataSelection	operator+ (const QCPDataSelection &a, const QCPDataSelection &b)
const QCPDataSelection	operator+ (const QCPDataRange &a, const QCPDataSelection &b)
const QCPDataSelection	operator+ (const QCPDataSelection &a, const QCPDataRange &b)
const QCPDataSelection	operator+ (const QCPDataRange &a, const QCPDataRange &b)
const QCPDataSelection	operator- (const QCPDataSelection &a, const QCPDataSelection &b)
const QCPDataSelection	operator- (const QCPDataRange &a, const QCPDataSelection &b)
const QCPDataSelection	operator- (const QCPDataSelection &a, const QCPDataRange &b)
const QCPDataSelection	operator- (const QCPDataRange &a, const QCPDataRange &b)

Related Symbols
(Note that these are not member symbols.)
QDebug	operator<< (QDebug d, const QCPDataSelection &selection)

Detailed Description

Describes a data set by holding multiple QCPDataRange instances.

QCPDataSelection manages multiple instances of QCPDataRange in order to represent any (possibly disjoint) set of data selection.

The data selection can be modified with addition and subtraction operators which take QCPDataSelection and QCPDataRange instances, as well as methods such as addDataRange and clear. Read access is provided by dataRange, dataRanges, dataRangeCount, etc.

The method simplify is used to join directly adjacent or even overlapping QCPDataRange instances. QCPDataSelection automatically simplifies when using the addition/subtraction operators. The only case when simplify is left to the user, is when calling addDataRange, with the parameter simplify explicitly set to false. This is useful if many data ranges will be added to the selection successively and the overhead for simplifying after each iteration shall be avoided. In this case, you should make sure to call simplify after completing the operation.

Use enforceType to bring the data selection into a state complying with the constraints for selections defined in QCP::SelectionType.

QCustomPlot's data selection mechanism is based on QCPDataSelection and QCPDataRange.

Iterating over a data selection

As an example, the following code snippet calculates the average value of a graph's data selection:

Constructor & Destructor Documentation

QCPDataSelection() [1/2]

QCPDataSelection::QCPDataSelection ( )

explicit

Creates an empty QCPDataSelection.

QCPDataSelection() [2/2]

QCPDataSelection::QCPDataSelection ( const QCPDataRange & range )

explicit

Creates a QCPDataSelection containing the provided range.

Member Function Documentation

addDataRange()

void QCPDataSelection::addDataRange	(	const QCPDataRange &	dataRange,
		bool	simplify = true )

Adds the given dataRange to this data selection. This is equivalent to the += operator but allows disabling immediate simplification by setting simplify to false. This can improve performance if adding a very large amount of data ranges successively. In this case, make sure to call simplify manually, after the operation.

clear()

void QCPDataSelection::clear

(

)

Removes all data ranges. The data selection then contains no data points.

isEmpty

contains()

bool QCPDataSelection::contains

(

const QCPDataSelection &

other

)

const

Returns true if the data selection other is contained entirely in this data selection, i.e. all data point indices that are in other are also in this data selection.

See also

QCPDataRange::contains

dataPointCount()

int QCPDataSelection::dataPointCount

(

)

const

Returns the total number of data points contained in all data ranges that make up this data selection.

dataRange()

QCPDataRange QCPDataSelection::dataRange

(

int

index = 0

)

const

Returns the data range with the specified index.

If the data selection is simplified (the usual state of the selection, see simplify), the ranges are sorted by ascending data point index.

See also

dataRangeCount

dataRangeCount()

int QCPDataSelection::dataRangeCount ( ) const

inline

Returns the number of ranges that make up the data selection. The ranges can be accessed by dataRange via their index.

See also

dataRange, dataPointCount

dataRanges()

QList< QCPDataRange > QCPDataSelection::dataRanges ( ) const

inline

Returns all data ranges that make up the data selection. If the data selection is simplified (the usual state of the selection, see simplify), the ranges are sorted by ascending data point index.

See also

dataRange

enforceType()

void QCPDataSelection::enforceType

(

QCP::SelectionType

type

)

Makes sure this data selection conforms to the specified type selection type. Before the type is enforced, simplify is called.

Depending on type, enforcing means adding new data points that were previously not part of the selection, or removing data points from the selection. If the current selection already conforms to type, the data selection is not changed.

See also

QCP::SelectionType

intersection() [1/2]

QCPDataSelection QCPDataSelection::intersection

(

const QCPDataRange &

other

)

const

Returns a data selection containing the points which are both in this data selection and in the data range other.

A common use case is to limit an unknown data selection to the valid range of a data container, using QCPDataContainer::dataRange as other. One can then safely iterate over the returned data selection without exceeding the data container's bounds.

intersection() [2/2]

QCPDataSelection QCPDataSelection::intersection

(

const QCPDataSelection &

other

)

const

Returns a data selection containing the points which are both in this data selection and in the data selection other.

inverse()

QCPDataSelection QCPDataSelection::inverse

(

const QCPDataRange &

outerRange

)

const

Returns a data selection which is the exact inverse of this data selection, with outerRange defining the base range on which to invert. If outerRange is smaller than the span of this data selection, it is expanded accordingly.

For example, this method can be used to retrieve all unselected segments by setting outerRange to the full data range of the plottable, and calling this method on a data selection holding the selected segments.

isEmpty()

bool QCPDataSelection::isEmpty ( ) const

inline

Returns true if there are no data ranges, and thus no data points, in this QCPDataSelection instance.

See also

dataRangeCount

operator+=() [1/2]

QCPDataSelection & QCPDataSelection::operator+=

(

const QCPDataRange &

other

)

Adds the data range other to this data selection, and then simplifies this data selection (see simplify).

operator+=() [2/2]

QCPDataSelection & QCPDataSelection::operator+=

(

const QCPDataSelection &

other

)

Adds the data selection of other to this data selection, and then simplifies this data selection (see simplify).

operator-=() [1/2]

QCPDataSelection & QCPDataSelection::operator-=

(

const QCPDataRange &

other

)

Removes all data point indices that are described by other from this data selection.

operator-=() [2/2]

QCPDataSelection & QCPDataSelection::operator-=

(

const QCPDataSelection &

other

)

Removes all data point indices that are described by other from this data selection.

operator==()

bool QCPDataSelection::operator==

(

const QCPDataSelection &

other

)

const

Returns true if this selection is identical (contains the same data ranges with the same begin and end indices) to other.

Note that both data selections must be in simplified state (the usual state of the selection, see simplify) for this operator to return correct results.

simplify()

void QCPDataSelection::simplify

(

)

Sorts all data ranges by range begin index in ascending order, and then joins directly adjacent or overlapping ranges. This can reduce the number of individual data ranges in the selection, and prevents possible double-counting when iterating over the data points held by the data ranges.

This method is automatically called when using the addition/subtraction operators. The only case when simplify is left to the user, is when calling addDataRange, with the parameter simplify explicitly set to false.

span()

QCPDataRange QCPDataSelection::span

(

)

const

Returns a QCPDataRange which spans the entire data selection, including possible intermediate segments which are not part of the original data selection.

Friends And Related Symbol Documentation

operator+ [1/4]

const QCPDataSelection operator+ ( const QCPDataRange & a, const QCPDataRange & b )

friend

Return a QCPDataSelection with the data points in a joined with the data points in b. The resulting data selection is already simplified (see QCPDataSelection::simplify).

operator+ [2/4]

const QCPDataSelection operator+ ( const QCPDataRange & a, const QCPDataSelection & b )

friend

Return a QCPDataSelection with the data points in a joined with the data points in b. The resulting data selection is already simplified (see QCPDataSelection::simplify).

operator+ [3/4]

const QCPDataSelection operator+ ( const QCPDataSelection & a, const QCPDataRange & b )

friend

Return a QCPDataSelection with the data points in a joined with the data points in b. The resulting data selection is already simplified (see QCPDataSelection::simplify).

operator+ [4/4]

const QCPDataSelection operator+ ( const QCPDataSelection & a, const QCPDataSelection & b )

friend

Return a QCPDataSelection with the data points in a joined with the data points in b. The resulting data selection is already simplified (see QCPDataSelection::simplify).

operator- [1/4]

const QCPDataSelection operator- ( const QCPDataRange & a, const QCPDataRange & b )

friend

Return a QCPDataSelection with the data points which are in a but not in b.

operator- [2/4]

const QCPDataSelection operator- ( const QCPDataRange & a, const QCPDataSelection & b )

friend

Return a QCPDataSelection with the data points which are in a but not in b.

operator- [3/4]

const QCPDataSelection operator- ( const QCPDataSelection & a, const QCPDataRange & b )

friend

Return a QCPDataSelection with the data points which are in a but not in b.

operator- [4/4]

const QCPDataSelection operator- ( const QCPDataSelection & a, const QCPDataSelection & b )

friend

Return a QCPDataSelection with the data points which are in a but not in b.

operator<<()

QDebug operator<< ( QDebug d, const QCPDataSelection & selection )

related

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

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

• app/NaFCSE/qcustomplot.h
• app/NaFCSE/qcustomplot.cpp