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QCPDataSelection Class Reference

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

#include <qcustomplot.h>

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
 

Related Functions

(Note that these are not member functions.)

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:

qcpdataselection-iterating-1

Definition at line 1145 of file qcustomplot.h.

Constructor & Destructor Documentation

◆ QCPDataSelection() [1/2]

QCPDataSelection::QCPDataSelection ( )
explicit

Creates an empty QCPDataSelection.

Definition at line 2347 of file qcustomplot.cpp.

Referenced by inverse().

◆ QCPDataSelection() [2/2]

QCPDataSelection::QCPDataSelection ( const QCPDataRange &  range)
explicit

Creates a QCPDataSelection containing the provided range.

Definition at line 2352 of file qcustomplot.cpp.

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.

Definition at line 2501 of file qcustomplot.cpp.

References dataRange(), and simplify().

Referenced by operator+=(), and QCPAbstractPlottable1D< DataType >::selectTest().

◆ clear()

void QCPDataSelection::clear ( )

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

isEmpty

Definition at line 2512 of file qcustomplot.cpp.

◆ 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

Definition at line 2603 of file qcustomplot.cpp.

References isEmpty().

Referenced by QCPAbstractPlottable::selectEvent().

◆ dataPointCount()

int QCPDataSelection::dataPointCount ( ) const

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

Definition at line 2457 of file qcustomplot.cpp.

References result.

Referenced by QCustomPlot::processRectSelection().

◆ 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

Definition at line 2472 of file qcustomplot.cpp.

Referenced by addDataRange(), intersection(), operator-=(), and operator<<().

◆ 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

Definition at line 1176 of file qcustomplot.h.

Referenced by intersection(), operator-=(), and operator<<().

◆ 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

Definition at line 1179 of file qcustomplot.h.

Referenced by QCPSelectionDecoratorBracket::drawDecoration(), QCPAbstractPlottable1D< DataType >::getDataSegments(), and QCPErrorBars::getDataSegments().

◆ 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

Definition at line 2562 of file qcustomplot.cpp.

References isEmpty(), simplify(), span(), QCP::stDataRange, QCP::stMultipleDataRanges, QCP::stNone, QCP::stSingleData, QCP::stWhole, and type.

Referenced by QCPAbstractPlottable::setSelectable(), and QCPAbstractPlottable::setSelection().

◆ 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.

Definition at line 2631 of file qcustomplot.cpp.

References result.

Referenced by intersection().

◆ 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.

Definition at line 2644 of file qcustomplot.cpp.

References dataRange(), dataRangeCount(), intersection(), and result.

◆ 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.

Definition at line 2663 of file qcustomplot.cpp.

References QCPDataRange::begin(), QCPDataRange::end(), QCPDataRange::expanded(), isEmpty(), QCPDataSelection(), result, and span().

Referenced by QCPAbstractPlottable1D< DataType >::getDataSegments(), and QCPErrorBars::getDataSegments().

◆ 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

Definition at line 1185 of file qcustomplot.h.

Referenced by contains(), QCPSelectionDecoratorBracket::drawDecoration(), enforceType(), inverse(), QCustomPlot::mouseDoubleClickEvent(), QCustomPlot::mouseReleaseEvent(), operator-=(), QCustomPlot::processRectSelection(), and span().

◆ operator!=()

bool QCPDataSelection::operator!= ( const QCPDataSelection &  other) const
inline

Definition at line 1151 of file qcustomplot.h.

◆ 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).

Definition at line 2385 of file qcustomplot.cpp.

References addDataRange().

◆ 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).

Definition at line 2375 of file qcustomplot.cpp.

References simplify().

◆ operator-=() [1/2]

QCPDataSelection & QCPDataSelection::operator-= ( const QCPDataRange &  other)

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

Definition at line 2405 of file qcustomplot.cpp.

References QCPDataRange::begin(), QCPDataRange::end(), QCPDataRange::isEmpty(), isEmpty(), and simplify().

◆ operator-=() [2/2]

QCPDataSelection & QCPDataSelection::operator-= ( const QCPDataSelection &  other)

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

Definition at line 2394 of file qcustomplot.cpp.

References dataRange(), and dataRangeCount().

◆ 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.

Definition at line 2363 of file qcustomplot.cpp.

◆ 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.

Definition at line 2525 of file qcustomplot.cpp.

Referenced by addDataRange(), enforceType(), QCPAbstractPlottable1D< DataType >::getDataSegments(), QCPErrorBars::getDataSegments(), operator+=(), operator-=(), and QCPAbstractPlottable1D< DataType >::selectTest().

◆ 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.

Definition at line 2486 of file qcustomplot.cpp.

References isEmpty().

Referenced by enforceType(), and inverse().

Friends And Related Function Documentation

◆ operator<<()

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

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

Definition at line 1310 of file qcustomplot.h.

References dataRange(), and dataRangeCount().

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