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QCPGraph Class Reference

A plottable representing a graph in a plot. More...

Inheritance diagram for QCPGraph:

## Public Types
enum | LineStyle { lsNone, lsLine, lsStepLeft, lsStepRight, lsStepCenter, lsImpulse }
enum | ErrorType { etNone, etKey, etValue, etBoth }

## Public Member Functions
| QCPGraph (QCPAxis *keyAxis, QCPAxis *valueAxis)
QCPDataMap * | data () const
LineStyle | lineStyle () const
QCPScatterStyle | scatterStyle () const
ErrorType | errorType () const
QPen | errorPen () const
double | errorBarSize () const
bool | errorBarSkipSymbol () const
QCPGraph * | channelFillGraph () const
bool | adaptiveSampling () const
void | setData (QCPDataMap *data, bool copy=false)
void | setData (const QVector< double > &key, const QVector< double > &value)
void | setDataKeyError (const QVector< double > &key, const QVector< double > &value, const QVector< double > &keyError)
void | setDataKeyError (const QVector< double > &key, const QVector< double > &value, const QVector< double > &keyErrorMinus, const QVector< double > &keyErrorPlus)
void | setDataValueError (const QVector< double > &key, const QVector< double > &value, const QVector< double > &valueError)
void | setDataValueError (const QVector< double > &key, const QVector< double > &value, const QVector< double > &valueErrorMinus, const QVector< double > &valueErrorPlus)
void | setDataBothError (const QVector< double > &key, const QVector< double > &value, const QVector< double > &keyError, const QVector< double > &valueError)
void | setDataBothError (const QVector< double > &key, const QVector< double > &value, const QVector< double > &keyErrorMinus, const QVector< double > &keyErrorPlus, const QVector< double > &valueErrorMinus, const QVector< double > &valueErrorPlus)
void | setLineStyle (LineStyle ls)
void | setScatterStyle (const QCPScatterStyle &style)
void | setErrorType (ErrorType errorType)
void | setErrorPen (const QPen &pen)
void | setErrorBarSize (double size)
void | setErrorBarSkipSymbol (bool enabled)
void | setChannelFillGraph (QCPGraph *targetGraph)
void | setAdaptiveSampling (bool enabled)
void | addData (const QCPDataMap &dataMap)
void | addData (const QCPData &data)
void | addData (double key, double value)
void | addData (const QVector< double > &keys, const QVector< double > &values)
void | removeDataBefore (double key)
void | removeDataAfter (double key)
void | removeData (double fromKey, double toKey)
void | removeData (double key)
virtual void | clearData ()
virtual double | selectTest (const QPointF &pos, bool onlySelectable, QVariant *details=0) const
void | rescaleAxes (bool onlyEnlarge, bool includeErrorBars) const
void | rescaleKeyAxis (bool onlyEnlarge, bool includeErrorBars) const
void | rescaleValueAxis (bool onlyEnlarge, bool includeErrorBars) const
Public Member Functions inherited from QCPAbstractPlottable
| QCPAbstractPlottable (QCPAxis *keyAxis, QCPAxis *valueAxis)
QString | name () const
bool | antialiasedFill () const
bool | antialiasedScatters () const
bool | antialiasedErrorBars () const
QPen | pen () const
QPen | selectedPen () const
QBrush | brush () const
QBrush | selectedBrush () const
QCPAxis * | keyAxis () const
QCPAxis * | valueAxis () const
bool | selectable () const
bool | selected () const
void | setName (const QString &name)
void | setAntialiasedFill (bool enabled)
void | setAntialiasedScatters (bool enabled)
void | setAntialiasedErrorBars (bool enabled)
void | setPen (const QPen &pen)
void | setSelectedPen (const QPen &pen)
void | setBrush (const QBrush &brush)
void | setSelectedBrush (const QBrush &brush)
void | setKeyAxis (QCPAxis *axis)
void | setValueAxis (QCPAxis *axis)
Q_SLOT void | setSelectable (bool selectable)
Q_SLOT void | setSelected (bool selected)
virtual bool | addToLegend ()
virtual bool | removeFromLegend () const
void | rescaleAxes (bool onlyEnlarge=false) const
void | rescaleKeyAxis (bool onlyEnlarge=false) const
void | rescaleValueAxis (bool onlyEnlarge=false) const
Public Member Functions inherited from QCPLayerable
| QCPLayerable (QCustomPlot *plot, QString targetLayer=QString(), QCPLayerable *parentLayerable=0)
bool | visible () const
QCustomPlot * | parentPlot () const
QCPLayerable * | parentLayerable () const
QCPLayer * | layer () const
bool | antialiased () const
void | setVisible (bool on)
Q_SLOT bool | setLayer (QCPLayer *layer)
bool | setLayer (const QString &layerName)
void | setAntialiased (bool enabled)
bool | realVisibility () const

## Protected Member Functions
virtual void | draw (QCPPainter *painter)
virtual void | drawLegendIcon (QCPPainter *painter, const QRectF &rect) const
virtual QCPRange | getKeyRange (bool &foundRange, SignDomain inSignDomain=sdBoth) const
virtual QCPRange | getValueRange (bool &foundRange, SignDomain inSignDomain=sdBoth) const
virtual QCPRange | getKeyRange (bool &foundRange, SignDomain inSignDomain, bool includeErrors) const
virtual QCPRange | getValueRange (bool &foundRange, SignDomain inSignDomain, bool includeErrors) const
virtual void | drawFill (QCPPainter *painter, QVector< QPointF > *lineData) const
virtual void | drawScatterPlot (QCPPainter *painter, QVector< QCPData > *scatterData) const
virtual void | drawLinePlot (QCPPainter *painter, QVector< QPointF > *lineData) const
virtual void | drawImpulsePlot (QCPPainter *painter, QVector< QPointF > *lineData) const
void | getPreparedData (QVector< QCPData > *lineData, QVector< QCPData > *scatterData) const
void | getPlotData (QVector< QPointF > *lineData, QVector< QCPData > *scatterData) const
void | getScatterPlotData (QVector< QCPData > *scatterData) const
void | getLinePlotData (QVector< QPointF > *linePixelData, QVector< QCPData > *scatterData) const
void | getStepLeftPlotData (QVector< QPointF > *linePixelData, QVector< QCPData > *scatterData) const
void | getStepRightPlotData (QVector< QPointF > *linePixelData, QVector< QCPData > *scatterData) const
void | getStepCenterPlotData (QVector< QPointF > *linePixelData, QVector< QCPData > *scatterData) const
void | getImpulsePlotData (QVector< QPointF > *linePixelData, QVector< QCPData > *scatterData) const
void | drawError (QCPPainter *painter, double x, double y, const QCPData &data) const
void | getVisibleDataBounds (QCPDataMap::const_iterator &lower, QCPDataMap::const_iterator &upper) const
int | countDataInBounds (const QCPDataMap::const_iterator &lower, const QCPDataMap::const_iterator &upper, int maxCount) const
void | addFillBasePoints (QVector< QPointF > *lineData) const
void | removeFillBasePoints (QVector< QPointF > *lineData) const
QPointF | lowerFillBasePoint (double lowerKey) const
QPointF | upperFillBasePoint (double upperKey) const
const QPolygonF | getChannelFillPolygon (const QVector< QPointF > *lineData) const
int | findIndexBelowX (const QVector< QPointF > *data, double x) const
int | findIndexAboveX (const QVector< QPointF > *data, double x) const
int | findIndexBelowY (const QVector< QPointF > *data, double y) const
int | findIndexAboveY (const QVector< QPointF > *data, double y) const
double | pointDistance (const QPointF &pixelPoint) const
Protected Member Functions inherited from QCPAbstractPlottable
virtual QRect | clipRect () const
virtual QCP::Interaction | selectionCategory () const
void | applyDefaultAntialiasingHint (QCPPainter *painter) const
virtual void | selectEvent (QMouseEvent *event, bool additive, const QVariant &details, bool *selectionStateChanged)
virtual void | deselectEvent (bool *selectionStateChanged)
void | coordsToPixels (double key, double value, double &x, double &y) const
const QPointF | coordsToPixels (double key, double value) const
void | pixelsToCoords (double x, double y, double &key, double &value) const
void | pixelsToCoords (const QPointF &pixelPos, double &key, double &value) const
QPen | mainPen () const
QBrush | mainBrush () const
void | applyFillAntialiasingHint (QCPPainter *painter) const
void | applyScattersAntialiasingHint (QCPPainter *painter) const
void | applyErrorBarsAntialiasingHint (QCPPainter *painter) const
double | distSqrToLine (const QPointF &start, const QPointF &end, const QPointF &point) const
Protected Member Functions inherited from QCPLayerable
virtual void | parentPlotInitialized (QCustomPlot *parentPlot)
void | initializeParentPlot (QCustomPlot *parentPlot)
void | setParentLayerable (QCPLayerable *parentLayerable)
bool | moveToLayer (QCPLayer *layer, bool prepend)
void | applyAntialiasingHint (QCPPainter *painter, bool localAntialiased, QCP::AntialiasedElement overrideElement) const

## Protected Attributes
QCPDataMap * | mData
QPen | mErrorPen
LineStyle | mLineStyle
QCPScatterStyle | mScatterStyle
ErrorType | mErrorType
double | mErrorBarSize
bool | mErrorBarSkipSymbol
QPointer< QCPGraph > | mChannelFillGraph
bool | mAdaptiveSampling
Protected Attributes inherited from QCPAbstractPlottable
QString | mName
bool | mAntialiasedFill
bool | mAntialiasedScatters
bool | mAntialiasedErrorBars
QPen | mPen
QPen | mSelectedPen
QBrush | mBrush
QBrush | mSelectedBrush
QPointer< QCPAxis > | mKeyAxis
QPointer< QCPAxis > | mValueAxis
bool | mSelectable
bool | mSelected
Protected Attributes inherited from QCPLayerable
bool | mVisible
QCustomPlot * | mParentPlot
QPointer< QCPLayerable > | mParentLayerable
QCPLayer * | mLayer
bool | mAntialiased

## Friends
class | QCustomPlot
class | QCPLegend

## Additional Inherited Members
Signals inherited from QCPAbstractPlottable
void | selectionChanged (bool selected)
void | selectableChanged (bool selectable)
Signals inherited from QCPLayerable
void | layerChanged (QCPLayer *newLayer)
Protected Types inherited from QCPAbstractPlottable
enum | SignDomain { sdNegative, sdBoth, sdPositive }

## Detailed Description

A plottable representing a graph in a plot.

Usually QCustomPlot creates graphs internally via QCustomPlot::addGraph and the resulting instance is accessed via QCustomPlot::graph.

To plot data, assign it with the setData or addData functions. Alternatively, you can also access and modify the graph's data via the data method, which returns a pointer to the internal QCPDataMap.

Graphs are used to display single-valued data. Single-valued means that there should only be one data point per unique key coordinate. In other words, the graph can't have loops. If you do want to plot non-single-valued curves, rather use the QCPCurve plottable.

# Changing the appearance

The appearance of the graph is mainly determined by the line style, scatter style, brush and pen of the graph (setLineStyle, setScatterStyle, setBrush, setPen).

## Filling under or between graphs

QCPGraph knows two types of fills: Normal graph fills towards the zero-value-line parallel to the key axis of the graph, and fills between two graphs, called channel fills. To enable a fill, just set a brush with setBrush which is neither Qt::NoBrush nor fully transparent.

By default, a normal fill towards the zero-value-line will be drawn. To set up a channel fill between this graph and another one, call setChannelFillGraph with the other graph as parameter.

See also
  QCustomPlot::addGraph, QCustomPlot::graph, QCPLegend::addGraph

## Member Enumeration Documentation

enum QCPGraph::ErrorType

Defines what kind of error bars are drawn for each data point

Enumerator
etNone | No error bars are shown.
etKey | Error bars for the key dimension of the data point are shown.
etValue | Error bars for the value dimension of the data point are shown.
etBoth | Error bars for both key and value dimensions of the data point are shown.

enum QCPGraph::LineStyle

Defines how the graph's line is represented visually in the plot. The line is drawn with the current pen of the graph (setPen).

See also
  setLineStyle

Enumerator
lsNone | data points are not connected with any lines (e.g. data only represented with symbols according to the scatter style, see setScatterStyle)
lsLine | data points are connected by a straight line
lsStepLeft | line is drawn as steps where the step height is the value of the left data point
lsStepRight | line is drawn as steps where the step height is the value of the right data point
lsStepCenter | line is drawn as steps where the step is in between two data points
lsImpulse | each data point is represented by a line parallel to the value axis, which reaches from the data point to the zero-value-line

## Constructor & Destructor Documentation

QCPGraph::QCPGraph | ( | QCPAxis * | keyAxis,
|  | QCPAxis * | valueAxis
| ) |  |
| explicit

Constructs a graph which uses keyAxis as its key axis ("x") and valueAxis as its value axis ("y"). keyAxis and valueAxis must reside in the same QCustomPlot instance and not have the same orientation. If either of these restrictions is violated, a corresponding message is printed to the debug output (qDebug), the construction is not aborted, though.

The constructed QCPGraph can be added to the plot with QCustomPlot::addPlottable, QCustomPlot then takes ownership of the graph.

To directly create a graph inside a plot, you can also use the simpler QCustomPlot::addGraph function.

## Member Function Documentation

void QCPGraph::addData | ( | const QCPDataMap & | dataMap | ) |

Adds the provided data points in dataMap to the current data.

Alternatively, you can also access and modify the graph's data via the data method, which returns a pointer to the internal QCPDataMap.

See also
  removeData

void QCPGraph::addData | ( | const QCPData & | data | ) |

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

Alternatively, you can also access and modify the graph's data via the data method, which returns a pointer to the internal QCPDataMap.

See also
  removeData

void QCPGraph::addData | ( | double | key,
|  | double | value
| ) |  |

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. Adds the provided single data point as key and value pair to the current data.

Alternatively, you can also access and modify the graph's data via the data method, which returns a pointer to the internal QCPDataMap.

See also
  removeData

void QCPGraph::addData | ( | const QVector< double > & | keys,
|  | const QVector< double > & | values
| ) |  |

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. Adds the provided data points as key and value pairs to the current data.

Alternatively, you can also access and modify the graph's data via the data method, which returns a pointer to the internal QCPDataMap.

See also
  removeData

void QCPGraph::clearData | ( |  | ) |
| virtual

Removes all data points.

See also
  removeData, removeDataAfter, removeDataBefore

Implements QCPAbstractPlottable.

QCPDataMap * QCPGraph::data | ( |  | ) | const
| inline

Returns a pointer to the internal data storage of type QCPDataMap. You may use it to directly manipulate the data, which may be more convenient and faster than using the regular setData or addData methods, in certain situations.

QCPRange QCPGraph::getKeyRange | ( | bool & | foundRange,
|  | SignDomain | inSignDomain,
|  | bool | includeErrors
| ) |  | const
| protectedvirtual

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

Allows to specify whether the error bars should be included in the range calculation.

See also
  getKeyRange(bool &foundRange, SignDomain inSignDomain)

QCPRange QCPGraph::getValueRange | ( | bool & | foundRange,
|  | SignDomain | inSignDomain,
|  | bool | includeErrors
| ) |  | const
| protectedvirtual

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

Allows to specify whether the error bars should be included in the range calculation.

See also
  getValueRange(bool &foundRange, SignDomain inSignDomain)

void QCPGraph::removeData | ( | double | fromKey,
|  | double | toKey
| ) |  |

Removes all data points with keys between fromKey and toKey. if fromKey is greater or equal to toKey, the function does nothing. To remove a single data point with known key, use removeData(double key).

See also
  addData, clearData

void QCPGraph::removeData | ( | double | key | ) |

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

Removes a single data point at key. If the position is not known with absolute precision, consider using removeData(double fromKey, double toKey) with a small fuzziness interval around the suspected position, depeding on the precision with which the key is known.

See also
  addData, clearData

void QCPGraph::removeDataAfter | ( | double | key | ) |

Removes all data points with keys greater than key.

See also
  addData, clearData

void QCPGraph::removeDataBefore | ( | double | key | ) |

Removes all data points with keys smaller than key.

See also
  addData, clearData

void QCPGraph::rescaleAxes | ( | bool | onlyEnlarge,
|  | bool | includeErrorBars
| ) |  | const

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

Allows to define whether error bars are taken into consideration when determining the new axis range.

See also
  rescaleKeyAxis, rescaleValueAxis, QCPAbstractPlottable::rescaleAxes, QCustomPlot::rescaleAxes

void QCPGraph::rescaleKeyAxis | ( | bool | onlyEnlarge,
|  | bool | includeErrorBars
| ) |  | const

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

Allows to define whether error bars (of kind QCPGraph::etKey) are taken into consideration when determining the new axis range.

See also
  rescaleAxes, QCPAbstractPlottable::rescaleKeyAxis

void QCPGraph::rescaleValueAxis | ( | bool | onlyEnlarge,
|  | bool | includeErrorBars
| ) |  | const

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

Allows to define whether error bars (of kind QCPGraph::etValue) are taken into consideration when determining the new axis range.

See also
  rescaleAxes, QCPAbstractPlottable::rescaleValueAxis

double QCPGraph::selectTest | ( | const QPointF & | pos,
|  | bool | onlySelectable,
|  | QVariant * | details = `0`
| ) |  | const
| virtual

This function is used to decide whether a click hits a layerable object or not.

pos is a point in pixel coordinates on the QCustomPlot surface. This function returns the shortest pixel distance of this point to the object. If the object is either invisible or the distance couldn't be determined, -1.0 is returned. Further, if onlySelectable is true and the object is not selectable, -1.0 is returned, too.

If the item is represented not by single lines but by an area like QCPItemRect or QCPItemText, a click inside the area returns a constant value greater zero (typically the selectionTolerance of the parent QCustomPlot multiplied by 0.99). If the click lies outside the area, this function returns -1.0.

Providing a constant value for area objects allows selecting line objects even when they are obscured by such area objects, by clicking close to the lines (i.e. closer than 0.99*selectionTolerance).

The actual setting of the selection state is not done by this function. This is handled by the parent QCustomPlot when the mouseReleaseEvent occurs, and the finally selected object is notified via the selectEvent/deselectEvent methods.

details is an optional output parameter. Every layerable subclass may place any information in details. This information will be passed to selectEvent when the parent QCustomPlot decides on the basis of this selectTest call, that the object was successfully selected. The subsequent call to selectEvent will carry the details. This is useful for multi-part objects (like QCPAxis). This way, a possibly complex calculation to decide which part was clicked is only done once in selectTest. The result (i.e. the actually clicked part) can then be placed in details. So in the subsequent selectEvent, the decision which part was selected doesn't have to be done a second time for a single selection operation.

You may pass 0 as details to indicate that you are not interested in those selection details.

See also
  selectEvent, deselectEvent, QCustomPlot::setInteractions

Implements QCPAbstractPlottable.

void QCPGraph::setAdaptiveSampling | ( | bool | enabled | ) |

Sets whether adaptive sampling shall be used when plotting this graph. QCustomPlot's adaptive sampling technique can drastically improve the replot performance for graphs with a larger number of points (e.g. above 10,000), without notably changing the appearance of the graph.

By default, adaptive sampling is enabled. Even if enabled, QCustomPlot decides whether adaptive sampling shall actually be used on a per-graph basis. So leaving adaptive sampling enabled has no disadvantage in almost all cases.

A line plot of 500,000 points without and with adaptive sampling

As can be seen, line plots experience no visual degradation from adaptive sampling. Outliers are reproduced reliably, as well as the overall shape of the data set. The replot time reduces dramatically though. This allows QCustomPlot to display large amounts of data in realtime.

A scatter plot of 100,000 points without and with adaptive sampling

Care must be taken when using high-density scatter plots in combination with adaptive sampling. The adaptive sampling algorithm treats scatter plots more carefully than line plots which still gives a significant reduction of replot times, but not quite as much as for line plots. This is because scatter plots inherently need more data points to be preserved in order to still resemble the original, non-adaptive-sampling plot. As shown above, the results still aren't quite identical, as banding occurs for the outer data points. This is in fact intentional, such that the boundaries of the data cloud stay visible to the viewer. How strong the banding appears, depends on the point density, i.e. the number of points in the plot.

For some situations with scatter plots it might thus be desirable to manually turn adaptive sampling off. For example, when saving the plot to disk. This can be achieved by setting enabled to false before issuing a command like QCustomPlot::savePng, and setting enabled back to true afterwards.

void QCPGraph::setChannelFillGraph | ( | QCPGraph * | targetGraph | ) |

Sets the target graph for filling the area between this graph and targetGraph with the current brush (setBrush).

When targetGraph is set to 0, a normal graph fill to the zero-value-line will be shown. To disable any filling, set the brush to Qt::NoBrush.

See also
  setBrush

void QCPGraph::setData | ( | QCPDataMap * | data,
|  | bool | copy = `false`
| ) |  |

Replaces the current data with the provided data.

If copy is set to true, data points in data will only be copied. if false, the graph takes ownership of the passed data and replaces the internal data pointer with it. This is significantly faster than copying for large datasets.

Alternatively, you can also access and modify the graph's data via the data method, which returns a pointer to the internal QCPDataMap.

void QCPGraph::setData | ( | const QVector< double > & | key,
|  | const QVector< double > & | value
| ) |  |

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

Replaces the current data with the provided points in key and value pairs. The provided vectors should have equal length. Else, the number of added points will be the size of the smallest vector.

void QCPGraph::setDataBothError | ( | const QVector< double > & | key,
|  | const QVector< double > & | value,
|  | const QVector< double > & | keyError,
|  | const QVector< double > & | valueError
| ) |  |

Replaces the current data with the provided points in key and value pairs. Additionally the symmetrical key and value errors of the data points are set to the values in keyError and valueError. For error bars to show appropriately, see setErrorType. The provided vectors should have equal length. Else, the number of added points will be the size of the smallest vector.

For asymmetrical errors (plus different from minus), see the overloaded version of this function.

void QCPGraph::setDataBothError | ( | const QVector< double > & | key,
|  | const QVector< double > & | value,
|  | const QVector< double > & | keyErrorMinus,
|  | const QVector< double > & | keyErrorPlus,
|  | const QVector< double > & | valueErrorMinus,
|  | const QVector< double > & | valueErrorPlus
| ) |  |

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. Replaces the current data with the provided points in key and value pairs. Additionally the negative key and value errors of the data points are set to the values in keyErrorMinus and valueErrorMinus. The positive key and value errors are set to the values in keyErrorPlus valueErrorPlus. For error bars to show appropriately, see setErrorType. The provided vectors should have equal length. Else, the number of added points will be the size of the smallest vector.

void QCPGraph::setDataKeyError | ( | const QVector< double > & | key,
|  | const QVector< double > & | value,
|  | const QVector< double > & | keyError
| ) |  |

Replaces the current data with the provided points in key and value pairs. Additionally the symmetrical key error of the data points are set to the values in keyError. For error bars to show appropriately, see setErrorType. The provided vectors should have equal length. Else, the number of added points will be the size of the smallest vector.

For asymmetrical errors (plus different from minus), see the overloaded version of this function.

void QCPGraph::setDataKeyError | ( | const QVector< double > & | key,
|  | const QVector< double > & | value,
|  | const QVector< double > & | keyErrorMinus,
|  | const QVector< double > & | keyErrorPlus
| ) |  |

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. Replaces the current data with the provided points in key and value pairs. Additionally the negative key error of the data points are set to the values in keyErrorMinus, the positive key error to keyErrorPlus. For error bars to show appropriately, see setErrorType. The provided vectors should have equal length. Else, the number of added points will be the size of the smallest vector.

void QCPGraph::setDataValueError | ( | const QVector< double > & | key,
|  | const QVector< double > & | value,
|  | const QVector< double > & | valueError
| ) |  |

Replaces the current data with the provided points in key and value pairs. Additionally the symmetrical value error of the data points are set to the values in valueError. For error bars to show appropriately, see setErrorType. The provided vectors should have equal length. Else, the number of added points will be the size of the smallest vector.

For asymmetrical errors (plus different from minus), see the overloaded version of this function.

void QCPGraph::setDataValueError | ( | const QVector< double > & | key,
|  | const QVector< double > & | value,
|  | const QVector< double > & | valueErrorMinus,
|  | const QVector< double > & | valueErrorPlus
| ) |  |

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. Replaces the current data with the provided points in key and value pairs. Additionally the negative value error of the data points are set to the values in valueErrorMinus, the positive value error to valueErrorPlus. For error bars to show appropriately, see setErrorType. The provided vectors should have equal length. Else, the number of added points will be the size of the smallest vector.

void QCPGraph::setErrorBarSize | ( | double | size | ) |

Sets the width of the handles at both ends of an error bar in pixels.

void QCPGraph::setErrorBarSkipSymbol | ( | bool | enabled | ) |

If enabled is set to true, the error bar will not be drawn as a solid line under the scatter symbol but leave some free space around the symbol.

This feature uses the current scatter size (QCPScatterStyle::setSize) to determine the size of the area to leave blank. So when drawing Pixmaps as scatter points (QCPScatterStyle::ssPixmap), the scatter size must be set manually to a value corresponding to the size of the Pixmap, if the error bars should leave gaps to its boundaries.

setErrorType, setErrorBarSize, setScatterStyle

void QCPGraph::setErrorPen | ( | const QPen & | pen | ) |

Sets the pen with which the error bars will be drawn.

See also
  setErrorBarSize, setErrorType

void QCPGraph::setErrorType | ( | ErrorType | errorType | ) |

Sets which kind of error bars (Key Error, Value Error or both) should be drawn on each data point. If you set errorType to something other than etNone, make sure to actually pass error data via the specific setData functions along with the data points (e.g. setDataValueError, setDataKeyError, setDataBothError).

See also
  ErrorType

void QCPGraph::setLineStyle | ( | LineStyle | ls | ) |

Sets how the single data points are connected in the plot. For scatter-only plots, set ls to lsNone and setScatterStyle to the desired scatter style.

See also
  setScatterStyle

void QCPGraph::setScatterStyle | ( | const QCPScatterStyle & | style | ) |

Sets the visual appearance of single data points in the plot. If set to QCPScatterStyle::ssNone, no scatter points are drawn (e.g. for line-only-plots with appropriate line style).

See also
  QCPScatterStyle, setLineStyle

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

- /home/wireshark/builders/wireshark-master/ubuntu-16.04-x64/build/ui/qt/widgets/qcustomplot.h
- /home/wireshark/builders/wireshark-master/ubuntu-16.04-x64/build/ui/qt/widgets/qcustomplot.cpp