QCPDataRange

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QCPDataRange Class Reference

Public Member Functions

 QCPDataRange ()
 
 QCPDataRange (int begin, int end)
 
QCPDataRange adjusted (int changeBegin, int changeEnd) const
 
int begin () const
 
QCPDataRange bounded (const QCPDataRange &other) const
 
bool contains (const QCPDataRange &other) const
 
int end () const
 
QCPDataRange expanded (const QCPDataRange &other) const
 
QCPDataRange intersection (const QCPDataRange &other) const
 
bool intersects (const QCPDataRange &other) const
 
bool isEmpty () const
 
bool isValid () const
 
int length () const
 
bool operator!= (const QCPDataRange &other) const
 
bool operator== (const QCPDataRange &other) const
 
void setBegin (int begin)
 
void setEnd (int end)
 
int size () const
 

Related Functions

(Note that these are not member functions.)

QDebug operator<< (QDebug d, const QCPDataRange &dataRange)
 

Detailed Description

Describes a data range given by begin and end index.

QCPDataRange holds two integers describing the begin (setBegin) and end (setEnd) index of a contiguous set of data points. The end index corresponds to the data point just after the last data point of the data range, like in standard iterators.

Data Ranges are not bound to a certain plottable, thus they can be freely exchanged, created and modified. If a non-contiguous data set shall be described, the class QCPDataSelection is used, which holds and manages multiple instances of QCPDataRange. In most situations, QCPDataSelection is thus used.

Both QCPDataRange and QCPDataSelection offer convenience methods to work with them, e.g. bounded, expanded, intersects, intersection, adjusted, contains. Further, addition and subtraction operators (defined in QCPDataSelection) can be used to join/subtract data ranges and data selections (or mixtures), to retrieve a corresponding QCPDataSelection.

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

Note
Do not confuse QCPDataRange with QCPRange. A QCPRange describes an interval in floating point plot coordinates, e.g. the current axis range.

Definition at line 892 of file qcustomplot.h.

Constructor & Destructor Documentation

◆ QCPDataRange() [1/2]

QCPDataRange::QCPDataRange ( )

Creates an empty QCPDataRange, with begin and end set to 0.

Definition at line 2239 of file qcustomplot.cpp.

◆ QCPDataRange() [2/2]

QCPDataRange::QCPDataRange ( int  begin,
int  end 
)

Creates a QCPDataRange, initialized with the specified begin and end.

No checks or corrections are made to ensure the resulting range is valid (isValid).

Definition at line 2250 of file qcustomplot.cpp.

Member Function Documentation

◆ adjusted()

QCPDataRange QCPDataRange::adjusted ( int  changeBegin,
int  changeEnd 
) const
inline

Returns a data range where changeBegin and changeEnd were added to the begin and end indices, respectively.

Definition at line 917 of file qcustomplot.h.

◆ bounded()

QCPDataRange QCPDataRange::bounded ( const QCPDataRange &  other) const

Returns a data range that matches this data range, except that parts exceeding other are excluded.

This method is very similar to intersection, with one distinction: If this range and the other range share no intersection, the returned data range will be empty with begin and end set to the respective boundary side of other, at which this range is residing. (intersection would just return a range with begin and end set to 0.)

Definition at line 2265 of file qcustomplot.cpp.

◆ contains()

bool QCPDataRange::contains ( const QCPDataRange &  other) const

Returns whether all data points of other are also contained inside this data range.

See also
intersects

Definition at line 2321 of file qcustomplot.cpp.

◆ expanded()

QCPDataRange QCPDataRange::expanded ( const QCPDataRange &  other) const

Returns a data range that contains both this data range as well as other.

Definition at line 2281 of file qcustomplot.cpp.

◆ intersection()

QCPDataRange QCPDataRange::intersection ( const QCPDataRange &  other) const

Returns the data range which is contained in both this data range and other.

This method is very similar to bounded, with one distinction: If this range and the other range share no intersection, the returned data range will be empty with begin and end set to 0. (bounded would return a range with begin and end set to one of the boundaries of other, depending on which side this range is on.)

See also
QCPDataSelection::intersection

Definition at line 2296 of file qcustomplot.cpp.

◆ intersects()

bool QCPDataRange::intersects ( const QCPDataRange &  other) const

Returns whether this data range and other share common data points.

See also
intersection, contains

Definition at line 2310 of file qcustomplot.cpp.

◆ isEmpty()

bool QCPDataRange::isEmpty ( ) const
inline

Returns whether this range is empty, i.e. whether its begin index equals its end index.

See also
size, length

Definition at line 913 of file qcustomplot.h.

◆ isValid()

bool QCPDataRange::isValid ( ) const
inline

Returns whether this range is valid. A valid range has a begin index greater or equal to 0, and an end index greater or equal to the begin index.

Note
Invalid ranges should be avoided and are never the result of any of QCustomPlot's methods (unless they are themselves fed with invalid ranges). Do not pass invalid ranges to QCustomPlot's methods. The invalid range is not inherently prevented in QCPDataRange, to allow temporary invalid begin/end values while manipulating the range. An invalid range is not necessarily empty (isEmpty), since its length can be negative and thus non-zero.

Definition at line 912 of file qcustomplot.h.

◆ length()

int QCPDataRange::length ( ) const
inline

Returns the number of data points described by this data range. Equivalent to size.

Definition at line 905 of file qcustomplot.h.

◆ setBegin()

void QCPDataRange::setBegin ( int  begin)
inline

Sets the begin of this data range. The begin index points to the first data point that is part of the data range.

No checks or corrections are made to ensure the resulting range is valid (isValid).

See also
setEnd

Definition at line 908 of file qcustomplot.h.

◆ setEnd()

void QCPDataRange::setEnd ( int  end)
inline

Sets the end of this data range. The end index points to the data point just after the last data point that is part of the data range.

No checks or corrections are made to ensure the resulting range is valid (isValid).

See also
setBegin

Definition at line 909 of file qcustomplot.h.

◆ size()

int QCPDataRange::size ( ) const
inline

Returns the number of data points described by this data range. This is equal to the end index minus the begin index.

See also
length

Definition at line 904 of file qcustomplot.h.

Friends And Related Function Documentation

◆ operator<<()

QDebug operator<< ( QDebug  d,
const QCPDataRange &  dataRange 
)
related

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

Definition at line 1065 of file qcustomplot.h.

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