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QCustomPlot Class Reference

The central class of the library. This is the QWidget which displays the plot and interacts with the user. More...

Inherits QWidget.

Public Types

enum  LayerInsertMode
 
enum  RefreshPriority
 

Public Functions

 QCustomPlot (QWidget *parent=nullptr)
 
QRect viewport () const
 
double bufferDevicePixelRatio () const
 
QPixmap background () const
 
bool backgroundScaled () const
 
Qt::AspectRatioMode backgroundScaledMode () const
 
QCPLayoutGridplotLayout () const
 
QCP::AntialiasedElements antialiasedElements () const
 
QCP::AntialiasedElements notAntialiasedElements () const
 
bool autoAddPlottableToLegend () const
 
const QCP::Interactions interactions () const
 
int selectionTolerance () const
 
bool noAntialiasingOnDrag () const
 
QCP::PlottingHints plottingHints () const
 
Qt::KeyboardModifier multiSelectModifier () const
 
QCP::SelectionRectMode selectionRectMode () const
 
QCPSelectionRectselectionRect () const
 
bool openGl () const
 
void setViewport (const QRect &rect)
 
void setBufferDevicePixelRatio (double ratio)
 
void setBackground (const QPixmap &pm)
 
void setBackground (const QPixmap &pm, bool scaled, Qt::AspectRatioMode mode=Qt::KeepAspectRatioByExpanding)
 
void setBackground (const QBrush &brush)
 
void setBackgroundScaled (bool scaled)
 
void setBackgroundScaledMode (Qt::AspectRatioMode mode)
 
void setAntialiasedElements (const QCP::AntialiasedElements &antialiasedElements)
 
void setAntialiasedElement (QCP::AntialiasedElement antialiasedElement, bool enabled=true)
 
void setNotAntialiasedElements (const QCP::AntialiasedElements &notAntialiasedElements)
 
void setNotAntialiasedElement (QCP::AntialiasedElement notAntialiasedElement, bool enabled=true)
 
void setAutoAddPlottableToLegend (bool on)
 
void setInteractions (const QCP::Interactions &interactions)
 
void setInteraction (const QCP::Interaction &interaction, bool enabled=true)
 
void setSelectionTolerance (int pixels)
 
void setNoAntialiasingOnDrag (bool enabled)
 
void setPlottingHints (const QCP::PlottingHints &hints)
 
void setPlottingHint (QCP::PlottingHint hint, bool enabled=true)
 
void setMultiSelectModifier (Qt::KeyboardModifier modifier)
 
void setSelectionRectMode (QCP::SelectionRectMode mode)
 
void setSelectionRect (QCPSelectionRect *selectionRect)
 
void setOpenGl (bool enabled, int multisampling=16)
 
QCPAbstractPlottableplottable (int index)
 
QCPAbstractPlottableplottable ()
 
bool removePlottable (QCPAbstractPlottable *plottable)
 
bool removePlottable (int index)
 
int clearPlottables ()
 
int plottableCount () const
 
QList< QCPAbstractPlottable * > selectedPlottables () const
 
template<class PlottableType >
PlottableType * plottableAt (const QPointF &pos, bool onlySelectable=false, int *dataIndex=nullptr) const
 
QCPAbstractPlottableplottableAt (const QPointF &pos, bool onlySelectable=false, int *dataIndex=nullptr) const
 
bool hasPlottable (QCPAbstractPlottable *plottable) const
 
QCPGraphgraph (int index) const
 
QCPGraphgraph () const
 
QCPGraphaddGraph (QCPAxis *keyAxis=nullptr, QCPAxis *valueAxis=nullptr)
 
bool removeGraph (QCPGraph *graph)
 
bool removeGraph (int index)
 
int clearGraphs ()
 
int graphCount () const
 
QList< QCPGraph * > selectedGraphs () const
 
QCPAbstractItemitem (int index) const
 
QCPAbstractItemitem () const
 
bool removeItem (QCPAbstractItem *item)
 
bool removeItem (int index)
 
int clearItems ()
 
int itemCount () const
 
QList< QCPAbstractItem * > selectedItems () const
 
template<class ItemType >
ItemType * itemAt (const QPointF &pos, bool onlySelectable=false) const
 
QCPAbstractItemitemAt (const QPointF &pos, bool onlySelectable=false) const
 
bool hasItem (QCPAbstractItem *item) const
 
QCPLayerlayer (const QString &name) const
 
QCPLayerlayer (int index) const
 
QCPLayercurrentLayer () const
 
bool setCurrentLayer (const QString &name)
 
bool setCurrentLayer (QCPLayer *layer)
 
int layerCount () const
 
bool addLayer (const QString &name, QCPLayer *otherLayer=nullptr, LayerInsertMode insertMode=limAbove)
 
bool removeLayer (QCPLayer *layer)
 
bool moveLayer (QCPLayer *layer, QCPLayer *otherLayer, LayerInsertMode insertMode=limAbove)
 
int axisRectCount () const
 
QCPAxisRectaxisRect (int index=0) const
 
QList< QCPAxisRect * > axisRects () const
 
QCPLayoutElementlayoutElementAt (const QPointF &pos) const
 
QCPAxisRectaxisRectAt (const QPointF &pos) const
 
Q_SLOT void rescaleAxes (bool onlyVisiblePlottables=false)
 
QList< QCPAxis * > selectedAxes () const
 
QList< QCPLegend * > selectedLegends () const
 
Q_SLOT void deselectAll ()
 
bool savePdf (const QString &fileName, int width=0, int height=0, QCP::ExportPen exportPen=QCP::epAllowCosmetic, const QString &pdfCreator=QString(), const QString &pdfTitle=QString())
 
bool savePng (const QString &fileName, int width=0, int height=0, double scale=1.0, int quality=-1, int resolution=96, QCP::ResolutionUnit resolutionUnit=QCP::ruDotsPerInch)
 
bool saveJpg (const QString &fileName, int width=0, int height=0, double scale=1.0, int quality=-1, int resolution=96, QCP::ResolutionUnit resolutionUnit=QCP::ruDotsPerInch)
 
bool saveBmp (const QString &fileName, int width=0, int height=0, double scale=1.0, int resolution=96, QCP::ResolutionUnit resolutionUnit=QCP::ruDotsPerInch)
 
bool saveRastered (const QString &fileName, int width, int height, double scale, const char *format, int quality=-1, int resolution=96, QCP::ResolutionUnit resolutionUnit=QCP::ruDotsPerInch)
 
QPixmap toPixmap (int width=0, int height=0, double scale=1.0)
 
void toPainter (QCPPainter *painter, int width=0, int height=0)
 
Q_SLOT void replot (QCustomPlot::RefreshPriority refreshPriority=QCustomPlot::rpRefreshHint)
 
double replotTime (bool average=false) const
 

Public Members

QCPAxisxAxis
 
QCPAxisyAxis
 
QCPAxisxAxis2
 
QCPAxisyAxis2
 
QCPLegendlegend
 

Signals

void mouseDoubleClick (QMouseEvent *event)
 
void mousePress (QMouseEvent *event)
 
void mouseMove (QMouseEvent *event)
 
void mouseRelease (QMouseEvent *event)
 
void mouseWheel (QWheelEvent *event)
 
void plottableClick (QCPAbstractPlottable *plottable, int dataIndex, QMouseEvent *event)
 
void plottableDoubleClick (QCPAbstractPlottable *plottable, int dataIndex, QMouseEvent *event)
 
void itemClick (QCPAbstractItem *item, QMouseEvent *event)
 
void itemDoubleClick (QCPAbstractItem *item, QMouseEvent *event)
 
void axisClick (QCPAxis *axis, QCPAxis::SelectablePart part, QMouseEvent *event)
 
void axisDoubleClick (QCPAxis *axis, QCPAxis::SelectablePart part, QMouseEvent *event)
 
void legendClick (QCPLegend *legend, QCPAbstractLegendItem *item, QMouseEvent *event)
 
void legendDoubleClick (QCPLegend *legend, QCPAbstractLegendItem *item, QMouseEvent *event)
 
void selectionChangedByUser ()
 
void beforeReplot ()
 
void afterLayout ()
 
void afterReplot ()
 

Protected Functions

virtual QSize minimumSizeHint () const
 
virtual QSize sizeHint () const
 
virtual void paintEvent (QPaintEvent *event)
 
virtual void resizeEvent (QResizeEvent *event)
 
virtual void mouseDoubleClickEvent (QMouseEvent *event)
 
virtual void mousePressEvent (QMouseEvent *event)
 
virtual void mouseMoveEvent (QMouseEvent *event)
 
virtual void mouseReleaseEvent (QMouseEvent *event)
 
virtual void wheelEvent (QWheelEvent *event)
 
virtual void draw (QCPPainter *painter)
 
virtual void updateLayout ()
 
virtual void axisRemoved (QCPAxis *axis)
 
virtual void legendRemoved (QCPLegend *legend)
 
virtual Q_SLOT void processRectSelection (QRect rect, QMouseEvent *event)
 
virtual Q_SLOT void processRectZoom (QRect rect, QMouseEvent *event)
 
virtual Q_SLOT void processPointSelection (QMouseEvent *event)
 
bool registerPlottable (QCPAbstractPlottable *plottable)
 
bool registerGraph (QCPGraph *graph)
 
bool registerItem (QCPAbstractItem *item)
 
void updateLayerIndices () const
 
QCPLayerablelayerableAt (const QPointF &pos, bool onlySelectable, QVariant *selectionDetails=nullptr) const
 
QList< QCPLayerable * > layerableListAt (const QPointF &pos, bool onlySelectable, QList< QVariant > *selectionDetails=nullptr) const
 
void drawBackground (QCPPainter *painter)
 
void setupPaintBuffers ()
 
QCPAbstractPaintBuffercreatePaintBuffer ()
 
bool hasInvalidatedPaintBuffers ()
 
bool setupOpenGl ()
 
void freeOpenGl ()
 

Detailed Description

The central class of the library. This is the QWidget which displays the plot and interacts with the user.

For tutorials on how to use QCustomPlot, see the website
https://www.qcustomplot.com/

Member Enumeration Documentation

§ LayerInsertMode

Defines how a layer should be inserted relative to an other layer.

See also
addLayer, moveLayer
Enumerator
limBelow 

Layer is inserted below other layer.

limAbove 

Layer is inserted above other layer.

§ RefreshPriority

Defines with what timing the QCustomPlot surface is refreshed after a replot.

See also
replot
Enumerator
rpImmediateRefresh 

Replots immediately and repaints the widget immediately by calling QWidget::repaint() after the replot.

rpQueuedRefresh 

Replots immediately, but queues the widget repaint, by calling QWidget::update() after the replot. This way multiple redundant widget repaints can be avoided.

rpRefreshHint 

Whether to use immediate or queued refresh depends on whether the plotting hint QCP::phImmediateRefresh is set, see setPlottingHints.

rpQueuedReplot 

Queues the entire replot for the next event loop iteration. This way multiple redundant replots can be avoided. The actual replot is then done with rpRefreshHint priority.

Constructor & Destructor Documentation

§ QCustomPlot()

QCustomPlot::QCustomPlot ( QWidget *  parent = nullptr)
explicit

Constructs a QCustomPlot and sets reasonable default values.

Member Function Documentation

§ plotLayout()

QCPLayoutGrid * QCustomPlot::plotLayout ( ) const
inline

Returns the top level layout of this QCustomPlot instance. It is a QCPLayoutGrid, initially containing just one cell with the main QCPAxisRect inside.

§ selectionRect()

QCPSelectionRect * QCustomPlot::selectionRect ( ) const
inline

Allows access to the currently used QCPSelectionRect instance (or subclass thereof), that is used to handle and draw selection rect interactions (see setSelectionRectMode).

See also
setSelectionRect

§ setViewport()

void QCustomPlot::setViewport ( const QRect &  rect)

Sets the viewport of this QCustomPlot. Usually users of QCustomPlot don't need to change the viewport manually.

The viewport is the area in which the plot is drawn. All mechanisms, e.g. margin calculation take the viewport to be the outer border of the plot. The viewport normally is the rect() of the QCustomPlot widget, i.e. a rect with top left (0, 0) and size of the QCustomPlot widget.

Don't confuse the viewport with the axis rect (QCustomPlot::axisRect). An axis rect is typically an area enclosed by four axes, where the graphs/plottables are drawn in. The viewport is larger and contains also the axes themselves, their tick numbers, their labels, or even additional axis rects, color scales and other layout elements.

This function is used to allow arbitrary size exports with toPixmap, savePng, savePdf, etc. by temporarily changing the viewport size.

§ setBufferDevicePixelRatio()

void QCustomPlot::setBufferDevicePixelRatio ( double  ratio)

Sets the device pixel ratio used by the paint buffers of this QCustomPlot instance.

Normally, this doesn't need to be set manually, because it is initialized with the regular QWidget::devicePixelRatio which is configured by Qt to fit the display device (e.g. 1 for normal displays, 2 for High-DPI displays).

Device pixel ratios are supported by Qt only for Qt versions since 5.4. If this method is called when QCustomPlot is being used with older Qt versions, outputs an according qDebug message and leaves the internal buffer device pixel ratio at 1.0.

§ setBackground() [1/3]

void QCustomPlot::setBackground ( const QPixmap &  pm)

Sets pm as the viewport background pixmap (see setViewport). The pixmap is always drawn below all other objects in the plot.

For cases where the provided pixmap doesn't have the same size as the viewport, scaling can be enabled with setBackgroundScaled and the scaling mode (whether and how the aspect ratio is preserved) can be set with setBackgroundScaledMode. To set all these options in one call, consider using the overloaded version of this function.

If a background brush was set with setBackground(const QBrush &brush), the viewport will first be filled with that brush, before drawing the background pixmap. This can be useful for background pixmaps with translucent areas.

See also
setBackgroundScaled, setBackgroundScaledMode

§ setBackground() [2/3]

void QCustomPlot::setBackground ( const QPixmap &  pm,
bool  scaled,
Qt::AspectRatioMode  mode = Qt::KeepAspectRatioByExpanding 
)

This is an overloaded function.

Allows setting the background pixmap of the viewport, whether it shall be scaled and how it shall be scaled in one call.

See also
setBackground(const QPixmap &pm), setBackgroundScaled, setBackgroundScaledMode

§ setBackground() [3/3]

void QCustomPlot::setBackground ( const QBrush &  brush)

Sets the background brush of the viewport (see setViewport).

Before drawing everything else, the background is filled with brush. If a background pixmap was set with setBackground(const QPixmap &pm), this brush will be used to fill the viewport before the background pixmap is drawn. This can be useful for background pixmaps with translucent areas.

Set brush to Qt::NoBrush or Qt::Transparent to leave background transparent. This can be useful for exporting to image formats which support transparency, e.g. savePng.

See also
setBackgroundScaled, setBackgroundScaledMode

§ setBackgroundScaled()

void QCustomPlot::setBackgroundScaled ( bool  scaled)

Sets whether the viewport background pixmap shall be scaled to fit the viewport. If scaled is set to true, control whether and how the aspect ratio of the original pixmap is preserved with setBackgroundScaledMode.

Note that the scaled version of the original pixmap is buffered, so there is no performance penalty on replots. (Except when the viewport dimensions are changed continuously.)

See also
setBackground, setBackgroundScaledMode

§ setBackgroundScaledMode()

void QCustomPlot::setBackgroundScaledMode ( Qt::AspectRatioMode  mode)

If scaling of the viewport background pixmap is enabled (setBackgroundScaled), use this function to define whether and how the aspect ratio of the original pixmap is preserved.

See also
setBackground, setBackgroundScaled

§ setAntialiasedElements()

void QCustomPlot::setAntialiasedElements ( const QCP::AntialiasedElements &  antialiasedElements)

Sets which elements are forcibly drawn antialiased as an or combination of QCP::AntialiasedElement.

This overrides the antialiasing settings for whole element groups, normally controlled with the setAntialiasing function on the individual elements. If an element is neither specified in setAntialiasedElements nor in setNotAntialiasedElements, the antialiasing setting on each individual element instance is used.

For example, if antialiasedElements contains QCP::aePlottables, all plottables will be drawn antialiased, no matter what the specific QCPAbstractPlottable::setAntialiased value was set to.

if an element in antialiasedElements is already set in setNotAntialiasedElements, it is removed from there.

See also
setNotAntialiasedElements

§ setAntialiasedElement()

void QCustomPlot::setAntialiasedElement ( QCP::AntialiasedElement  antialiasedElement,
bool  enabled = true 
)

Sets whether the specified antialiasedElement is forcibly drawn antialiased.

See setAntialiasedElements for details.

See also
setNotAntialiasedElement

§ setNotAntialiasedElements()

void QCustomPlot::setNotAntialiasedElements ( const QCP::AntialiasedElements &  notAntialiasedElements)

Sets which elements are forcibly drawn not antialiased as an or combination of QCP::AntialiasedElement.

This overrides the antialiasing settings for whole element groups, normally controlled with the setAntialiasing function on the individual elements. If an element is neither specified in setAntialiasedElements nor in setNotAntialiasedElements, the antialiasing setting on each individual element instance is used.

For example, if notAntialiasedElements contains QCP::aePlottables, no plottables will be drawn antialiased, no matter what the specific QCPAbstractPlottable::setAntialiased value was set to.

if an element in notAntialiasedElements is already set in setAntialiasedElements, it is removed from there.

See also
setAntialiasedElements

§ setNotAntialiasedElement()

void QCustomPlot::setNotAntialiasedElement ( QCP::AntialiasedElement  notAntialiasedElement,
bool  enabled = true 
)

Sets whether the specified notAntialiasedElement is forcibly drawn not antialiased.

See setNotAntialiasedElements for details.

See also
setAntialiasedElement

§ setAutoAddPlottableToLegend()

void QCustomPlot::setAutoAddPlottableToLegend ( bool  on)

If set to true, adding a plottable (e.g. a graph) to the QCustomPlot automatically also adds the plottable to the legend (QCustomPlot::legend).

See also
addGraph, QCPLegend::addItem

§ setInteractions()

void QCustomPlot::setInteractions ( const QCP::Interactions &  interactions)

Sets the possible interactions of this QCustomPlot as an or-combination of QCP::Interaction enums. There are the following types of interactions:

Axis range manipulation is controlled via QCP::iRangeDrag and QCP::iRangeZoom. When the respective interaction is enabled, the user may drag axes ranges and zoom with the mouse wheel. For details how to control which axes the user may drag/zoom and in what orientations, see QCPAxisRect::setRangeDrag, QCPAxisRect::setRangeZoom, QCPAxisRect::setRangeDragAxes, QCPAxisRect::setRangeZoomAxes.

Plottable data selection is controlled by QCP::iSelectPlottables. If QCP::iSelectPlottables is set, the user may select plottables (graphs, curves, bars,...) and their data by clicking on them or in their vicinity (setSelectionTolerance). Whether the user can actually select a plottable and its data can further be restricted with the QCPAbstractPlottable::setSelectable method on the specific plottable. For details, see the special page about the data selection mechanism. To retrieve a list of all currently selected plottables, call selectedPlottables. If you're only interested in QCPGraphs, you may use the convenience function selectedGraphs.

Item selection is controlled by QCP::iSelectItems. If QCP::iSelectItems is set, the user may select items (QCPItemLine, QCPItemText,...) by clicking on them or in their vicinity. To find out whether a specific item is selected, call QCPAbstractItem::selected(). To retrieve a list of all currently selected items, call selectedItems.

Axis selection is controlled with QCP::iSelectAxes. If QCP::iSelectAxes is set, the user may select parts of the axes by clicking on them. What parts exactly (e.g. Axis base line, tick labels, axis label) are selectable can be controlled via QCPAxis::setSelectableParts for each axis. To retrieve a list of all axes that currently contain selected parts, call selectedAxes. Which parts of an axis are selected, can be retrieved with QCPAxis::selectedParts().

Legend selection is controlled with QCP::iSelectLegend. If this is set, the user may select the legend itself or individual items by clicking on them. What parts exactly are selectable can be controlled via QCPLegend::setSelectableParts. To find out whether the legend or any of its child items are selected, check the value of QCPLegend::selectedParts. To find out which child items are selected, call QCPLegend::selectedItems.

All other selectable elements The selection of all other selectable objects (e.g. QCPTextElement, or your own layerable subclasses) is controlled with QCP::iSelectOther. If set, the user may select those objects by clicking on them. To find out which are currently selected, you need to check their selected state explicitly.

If the selection state has changed by user interaction, the selectionChangedByUser signal is emitted. Each selectable object additionally emits an individual selectionChanged signal whenever their selection state has changed, i.e. not only by user interaction.

To allow multiple objects to be selected by holding the selection modifier (setMultiSelectModifier), set the flag QCP::iMultiSelect.

Note
In addition to the selection mechanism presented here, QCustomPlot always emits corresponding signals, when an object is clicked or double clicked. see plottableClick and plottableDoubleClick for example.
See also
setInteraction, setSelectionTolerance

§ setInteraction()

void QCustomPlot::setInteraction ( const QCP::Interaction interaction,
bool  enabled = true 
)

Sets the single interaction of this QCustomPlot to enabled.

For details about the interaction system, see setInteractions.

See also
setInteractions

§ setSelectionTolerance()

void QCustomPlot::setSelectionTolerance ( int  pixels)

Sets the tolerance that is used to decide whether a click selects an object (e.g. a plottable) or not.

If the user clicks in the vicinity of the line of e.g. a QCPGraph, it's only regarded as a potential selection when the minimum distance between the click position and the graph line is smaller than pixels. Objects that are defined by an area (e.g. QCPBars) only react to clicks directly inside the area and ignore this selection tolerance. In other words, it only has meaning for parts of objects that are too thin to exactly hit with a click and thus need such a tolerance.

See also
setInteractions, QCPLayerable::selectTest

§ setNoAntialiasingOnDrag()

void QCustomPlot::setNoAntialiasingOnDrag ( bool  enabled)

Sets whether antialiasing is disabled for this QCustomPlot while the user is dragging axes ranges. If many objects, especially plottables, are drawn antialiased, this greatly improves performance during dragging. Thus it creates a more responsive user experience. As soon as the user stops dragging, the last replot is done with normal antialiasing, to restore high image quality.

See also
setAntialiasedElements, setNotAntialiasedElements

§ setPlottingHints()

void QCustomPlot::setPlottingHints ( const QCP::PlottingHints &  hints)

Sets the plotting hints for this QCustomPlot instance as an or combination of QCP::PlottingHint.

See also
setPlottingHint

§ setPlottingHint()

void QCustomPlot::setPlottingHint ( QCP::PlottingHint  hint,
bool  enabled = true 
)

Sets the specified plotting hint to enabled.

See also
setPlottingHints

§ setMultiSelectModifier()

void QCustomPlot::setMultiSelectModifier ( Qt::KeyboardModifier  modifier)

Sets the keyboard modifier that will be recognized as multi-select-modifier.

If QCP::iMultiSelect is specified in setInteractions, the user may select multiple objects (or data points) by clicking on them one after the other while holding down modifier.

By default the multi-select-modifier is set to Qt::ControlModifier.

See also
setInteractions

§ setSelectionRectMode()

void QCustomPlot::setSelectionRectMode ( QCP::SelectionRectMode  mode)

Sets how QCustomPlot processes mouse click-and-drag interactions by the user.

If mode is QCP::srmNone, the mouse drag is s="memdoc">

This is an overloaded function.

Sets the provided layer to be the current layer.

Returns true on success, i.e. when layer is a valid layer in the QCustomPlot.

See also
addLayer, moveLayer, removeLayer

§ layerCount()

int QCustomPlot::layerCount ( ) const

Returns the number of currently existing layers in the plot

See also
layer, addLayer

§ addLayer()

bool QCustomPlot::addLayer ( const QString &  name,
QCPLayer otherLayer = nullptr,
QCustomPlot::LayerInsertMode  insertMode = limAbove 
)

Adds a new layer to this QCustomPlot instance. The new layer will have the name name, which must be unique. Depending on insertMode, it is positioned either below or above otherLayer.

Returns true on success, i.e. if there is no other layer named name and otherLayer is a valid layer inside this QCustomPlot.

If otherLayer is 0, the highest layer in the QCustomPlot will be used.

For an explanation of what layers are in QCustomPlot, see the documentation of QCPLayer.

See also
layer, moveLayer, removeLayer

§ removeLayer()

bool QCustomPlot::removeLayer ( QCPLayer layer)

Removes the specified layer and returns true on success.

All layerables (e.g. plottables and items) on the removed layer will be moved to the layer below layer. If layer is the bottom layer, the layerables are moved to the layer above. In both cases, the total rendering order of all layerables in the QCustomPlot is preserved.

If layer is the current layer (setCurrentLayer), the layer below (or above, if bottom layer) becomes the new current layer.

It is not possible to remove the last layer of the plot.

See also
layer, addLayer, moveLayer

§ moveLayer()

bool QCustomPlot::moveLayer ( QCPLayer layer,
QCPLayer otherLayer,
QCustomPlot::LayerInsertMode  insertMode = limAbove 
)

Moves the specified layer either above or below otherLayer. Whether it's placed above or below is controlled with insertMode.

Returns true on success, i.e. when both layer and otherLayer are valid layers in the QCustomPlot.

See also
layer, addLayer, moveLayer

§ axisRectCount()

int QCustomPlot::axisRectCount ( ) const

Returns the number of axis rects in the plot.

All axis rects can be accessed via QCustomPlot::axisRect().

Initially, only one axis rect exists in the plot.

See also
axisRect, axisRects

§ axisRect()

QCPAxisRect * QCustomPlot::axisRect ( int  index = 0) const

Returns the axis rect with index.

Initially, only one axis rect (with index 0) exists in the plot. If multiple axis rects were added, all of them may be accessed with this function in a linear fashion (even when they are nested in a layout hierarchy or inside other axis rects via QCPAxisRect::insetLayout).

The order of the axis rects is given by the fill order of the QCPLayout that is holding them. For example, if the axis rects are in the top level grid layout (accessible via QCustomPlot::plotLayout), they are ordered from left to right, top to bottom, if the layout's default setFillOrder of foColumnsFirst wasn't changed.

If you want to access axis rects by their row and column index, use the layout interface. For example, use QCPLayoutGrid::element of the top level grid layout, and qobject_cast the returned layout element to QCPAxisRect. (See also The Layout System.)

See also
axisRectCount, axisRects, QCPLayoutGrid::setFillOrder

§ axisRects()

QList< QCPAxisRect * > QCustomPlot::axisRects ( ) const

Returns all axis rects in the plot.

The order of the axis rects is given by the fill order of the QCPLayout that is holding them. For example, if the axis rects are in the top level grid layout (accessible via QCustomPlot::plotLayout), they are ordered from left to right, top to bottom, if the layout's default setFillOrder of foColumnsFirst wasn't changed.

See also
axisRectCount, axisRect, QCPLayoutGrid::setFillOrder

§ layoutElementAt()

QCPLayoutElement * QCustomPlot::layoutElementAt ( const QPointF &  pos) const

Returns the layout element at pixel position pos. If there is no element at that position, returns nullptr.

Only visible elements are used. If QCPLayoutElement::setVisible on the element itself or on any of its parent elements is set to false, it will not be considered.

See also
itemAt, plottableAt

§ axisRectAt()

QCPAxisRect * QCustomPlot::axisRectAt ( const QPointF &  pos) const

Returns the layout element of type QCPAxisRect at pixel position pos. This method ignores other layout elements even if they are visually in front of the axis rect (e.g. a QCPLegend). If there is no axis rect at that position, returns nullptr.

Only visible axis rects are used. If QCPLayoutElement::setVisible on the axis rect itself or on any of its parent elements is set to false, it will not be considered.

See also
layoutElementAt

§ rescaleAxes()

void QCustomPlot::rescaleAxes ( bool  onlyVisiblePlottables = false)

Rescales the axes such that all plottables (like graphs) in the plot are fully visible.

if onlyVisiblePlottables is set to true, only the plottables that have their visibility set to true (QCPLayerable::setVisible), will be used to rescale the axes.

See also
QCPAbstractPlottable::rescaleAxes, QCPAxis::rescale

§ selectedAxes()

QList< QCPAxis * > QCustomPlot::selectedAxes ( ) const

Returns the axes that currently have selected parts, i.e. whose selection state is not QCPAxis::spNone.

See also
selectedPlottables, selectedLegends, setInteractions, QCPAxis::setSelectedParts, QCPAxis::setSelectableParts

§ selectedLegends()

QList< QCPLegend * > QCustomPlot::selectedLegends ( ) const

Returns the legends that currently have selected parts, i.e. whose selection state is not QCPLegend::spNone.

See also
selectedPlottables, selectedAxes, setInteractions, QCPLegend::setSelectedParts, QCPLegend::setSelectableParts, QCPLegend::selectedItems

§ deselectAll()

void QCustomPlot::deselectAll ( )

Deselects all layerables (plottables, items, axes, legends,...) of the QCustomPlot.

Since calling this function is not a user interaction, this does not emit the selectionChangedByUser signal. The individual selectionChanged signals are emitted though, if the objects were previously selected.

See also
setInteractions, selectedPlottables, selectedItems, selectedAxes, selectedLegends

§ savePdf()

bool QCustomPlot::savePdf ( const QString &  fileName,
int  width = 0,
int  height = 0,
QCP::ExportPen  exportPen = QCP::epAllowCosmetic,
const QString &  pdfCreator = QString(),
const QString &  pdfTitle = QString() 
)

Saves a PDF with the vectorized plot to the file fileName. The axis ratio as well as the scale of texts and lines will be derived from the specified width and height. This means, the output will look like the normal on-screen output of a QCustomPlot widget with the corresponding pixel width and height. If either width or height is zero, the exported image will have the same dimensions as the QCustomPlot widget currently has.

Setting exportPen to QCP::epNoCosmetic allows to disable the use of cosmetic pens when drawing to the PDF file. Cosmetic pens are pens with numerical width 0, which are always drawn as a one pixel wide line, no matter what zoom factor is set in the PDF-Viewer. For more information about cosmetic pens, see the QPainter and QPen documentation.

The objects of the plot will appear in the current selection state. If you don't want any selected objects to be painted in their selected look, deselect everything with deselectAll before calling this function.

Returns true on success.

Warning
  • If you plan on editing the exported PDF file with a vector graphics editor like Inkscape, it is advised to set exportPen to QCP::epNoCosmetic to avoid losing those cosmetic lines (which might be quite many, because cosmetic pens are the default for e.g. axes and tick marks).
  • If calling this function inside the constructor of the parent of the QCustomPlot widget (i.e. the MainWindow constructor, if QCustomPlot is inside the MainWindow), always provide explicit non-zero widths and heights. If you leave width or height as 0 (default), this function uses the current width and height of the QCustomPlot widget. However, in Qt, these aren't defined yet inside the constructor, so you would get an image that has strange widths/heights.
pdfCreator and pdfTitle may be used to set the according metadata fields in the resulting PDF file.
Note
On Android systems, this method does nothing and issues an according qDebug warning message. This is also the case if for other reasons the define flag QT_NO_PRINTER is set.
See also
savePng, saveBmp, saveJpg, saveRastered

§ savePng()

bool QCustomPlot::savePng ( const QString &  fileName,
int  width = 0,
int  height = 0,
double  scale = 1.0,
int  quality = -1,
int  resolution = 96,
QCP::ResolutionUnit  resolutionUnit = QCP::ruDotsPerInch 
)

Saves a PNG image file to fileName on disc. The output plot will have the dimensions width and height in pixels, multiplied by scale. If either width or height is zero, the current width and height of the QCustomPlot widget is used instead. Line widths and texts etc. are not scaled up when larger widths/heights are used. If you want that effect, use the scale parameter.

For example, if you set both width and height to 100 and scale to 2, you will end up with an image file of size 200*200 in which all graphical elements are scaled up by factor 2 (line widths, texts, etc.). This scaling is not done by stretching a 100*100 image, the result will have full 200*200 pixel resolution.

If you use a high scaling factor, it is recommended to enable antialiasing for all elements by temporarily setting QCustomPlot::setAntialiasedElements to QCP::aeAll as this allows QCustomPlot to place objects with sub-pixel accuracy.

image compression can be controlled with the quality parameter which must be between 0 and 100 or -1 to use the default setting.

The resolution will be written to the image file header and has no direct consequence for the quality or the pixel size. However, if opening the image with a tool which respects the metadata, it will be able to scale the image to match either a given size in real units of length (inch, centimeters, etc.), or the target display DPI. You can specify in which units resolution is given, by setting resolutionUnit. The resolution is converted to the format's expected resolution unit internally.

Returns true on success. If this function fails, most likely the PNG format isn't supported by the system, see Qt docs about QImageWriter::supportedImageFormats().

The objects of the plot will appear in the current selection state. If you don't want any selected objects to be painted in their selected look, deselect everything with deselectAll before calling this function.

If you want the PNG to have a transparent background, call setBackground(const QBrush &brush) with no brush (Qt::NoBrush) or a transparent color (Qt::transparent), before saving.

Warning
If calling this function inside the constructor of the parent of the QCustomPlot widget (i.e. the MainWindow constructor, if QCustomPlot is inside the MainWindow), always provide explicit non-zero widths and heights. If you leave width or height as 0 (default), this function uses the current width and height of the QCustomPlot widget. However, in Qt, these aren't defined yet inside the constructor, so you would get an image that has strange widths/heights.
See also
savePdf, saveBmp, saveJpg, saveRastered

§ saveJpg()

bool QCustomPlot::saveJpg ( const QString &  fileName,
int  width = 0,
int  height = 0,
double  scale = 1.0,
int  quality = -1,
int  resolution = 96,
QCP::ResolutionUnit  resolutionUnit = QCP::ruDotsPerInch 
)

Saves a JPEG image file to fileName on disc. The output plot will have the dimensions width and height in pixels, multiplied by scale. If either width or height is zero, the current width and height of the QCustomPlot widget is used instead. Line widths and texts etc. are not scaled up when larger widths/heights are used. If you want that effect, use the scale parameter.

For example, if you set both width and height to 100 and scale to 2, you will end up with an image file of size 200*200 in which all graphical elements are scaled up by factor 2 (line widths, texts, etc.). This scaling is not done by stretching a 100*100 image, the result will have full 200*200 pixel resolution.

If you use a high scaling factor, it is recommended to enable antialiasing for all elements by temporarily setting QCustomPlot::setAntialiasedElements to QCP::aeAll as this allows QCustomPlot to place objects with sub-pixel accuracy.

image compression can be controlled with the quality parameter which must be between 0 and 100 or -1 to use the default setting.

The resolution will be written to the image file header and has no direct consequence for the quality or the pixel size. However, if opening the image with a tool which respects the metadata, it will be able to scale the image to match either a given size in real units of length (inch, centimeters, etc.), or the target display DPI. You can specify in which units resolution is given, by setting resolutionUnit. The resolution is converted to the format's expected resolution unit internally.

Returns true on success. If this function fails, most likely the JPEG format isn't supported by the system, see Qt docs about QImageWriter::supportedImageFormats().

The objects of the plot will appear in the current selection state. If you don't want any selected objects to be painted in their selected look, deselect everything with deselectAll before calling this function.

Warning
If calling this function inside the constructor of the parent of the QCustomPlot widget (i.e. the MainWindow constructor, if QCustomPlot is inside the MainWindow), always provide explicit non-zero widths and heights. If you leave width or height as 0 (default), this function uses the current width and height of the QCustomPlot widget. However, in Qt, these aren't defined yet inside the constructor, so you would get an image that has strange widths/heights.
See also
savePdf, savePng, saveBmp, saveRastered

§ saveBmp()

bool QCustomPlot::saveBmp ( const QString &  fileName,
int  width = 0,
int  height = 0,
double  scale = 1.0,
int  resolution = 96,
QCP::ResolutionUnit  resolutionUnit = QCP::ruDotsPerInch 
)

Saves a BMP image file to fileName on disc. The output plot will have the dimensions width and height in pixels, multiplied by scale. If either width or height is zero, the current width and height of the QCustomPlot widget is used instead. Line widths and texts etc. are not scaled up when larger widths/heights are used. If you want that effect, use the scale parameter.

For example, if you set both width and height to 100 and scale to 2, you will end up with an image file of size 200*200 in which all graphical elements are scaled up by factor 2 (line widths, texts, etc.). This scaling is not done by stretching a 100*100 image, the result will have full 200*200 pixel resolution.

If you use a high scaling factor, it is recommended to enable antialiasing for all elements by temporarily setting QCustomPlot::setAntialiasedElements to QCP::aeAll as this allows QCustomPlot to place objects with sub-pixel accuracy.

The resolution will be written to the image file header and has no direct consequence for the quality or the pixel size. However, if opening the image with a tool which respects the metadata, it will be able to scale the image to match either a given size in real units of length (inch, centimeters, etc.), or the target display DPI. You can specify in which units resolution is given, by setting resolutionUnit. The resolution is converted to the format's expected resolution unit internally.

Returns true on success. If this function fails, most likely the BMP format isn't supported by the system, see Qt docs about QImageWriter::supportedImageFormats().

The objects of the plot will appear in the current selection state. If you don't want any selected objects to be painted in their selected look, deselect everything with deselectAll before calling this function.

Warning
If calling this function inside the constructor of the parent of the QCustomPlot widget (i.e. the MainWindow constructor, if QCustomPlot is inside the MainWindow), always provide explicit non-zero widths and heights. If you leave width or height as 0 (default), this function uses the current width and height of the QCustomPlot widget. However, in Qt, these aren't defined yet inside the constructor, so you would get an image that has strange widths/heights.
See also
savePdf, savePng, saveJpg, saveRastered

§ saveRastered()

bool QCustomPlot::saveRastered ( const QString &  fileName,
int  width,
int  height,
double  scale,
const char *  format,
int  quality = -1,
int  resolution = 96,
QCP::ResolutionUnit  resolutionUnit = QCP::ruDotsPerInch 
)

Saves the plot to a rastered image file fileName in the image format format. The plot is sized to width and height in pixels and scaled with scale. (width 100 and scale 2.0 lead to a full resolution file with width 200.) If the format supports compression, quality may be between 0 and 100 to control it.

Returns true on success. If this function fails, most likely the given format isn't supported by the system, see Qt docs about QImageWriter::supportedImageFormats().

The resolution will be written to the image file header (if the file format supports this) and has no direct consequence for the quality or the pixel size. However, if opening the image with a tool which respects the metadata, it will be able to scale the image to match either a given size in real units of length (inch, centimeters, etc.), or the target display DPI. You can specify in which units resolution is given, by setting resolutionUnit. The resolution is converted to the format's expected resolution unit internally.

See also
saveBmp, saveJpg, savePng, savePdf

§ toPixmap()

QPixmap QCustomPlot::toPixmap ( int  width = 0,
int  height = 0,
double  scale = 1.0 
)

Renders the plot to a pixmap and returns it.

The plot is sized to width and height in pixels and scaled with scale. (width 100 and scale 2.0 lead to a full resolution pixmap with width 200.)

See also
toPainter, saveRastered, saveBmp, savePng, saveJpg, savePdf

§ toPainter()

void QCustomPlot::toPainter ( QCPPainter painter,
int  width = 0,
int  height = 0 
)

Renders the plot using the passed painter.

The plot is sized to width and height in pixels. If the painter's scale is not 1.0, the resulting plot will appear scaled accordingly.

Note
If you are restricted to using a QPainter (instead of QCPPainter), create a temporary QPicture and open a QCPPainter on it. Then call toPainter with this QCPPainter. After ending the paint operation on the picture, draw it with the QPainter. This will reproduce the painter actions the QCPPainter took, with a QPainter.
See also
toPixmap

§ replot()

void QCustomPlot::replot ( QCustomPlot::RefreshPriority  refreshPriority = QCustomPlot::rpRefreshHint)

Causes a complete replot into the internal paint buffer(s). Finally, the widget surface is refreshed with the new buffer contents. This is the method that must be called to make changes to the plot, e.g. on the axis ranges or data points of graphs, visible.

The parameter refreshPriority can be used to fine-tune the timing of the replot. For example if your application calls replot very quickly in succession (e.g. multiple independent functions change some aspects of the plot and each wants to make sure the change gets replotted), it is advisable to set refreshPriority to QCustomPlot::rpQueuedReplot. This way, the actual replotting is deferred to the next event loop iteration. Multiple successive calls of replot with this priority will only cause a single replot, avoiding redundant replots and improving performance.

Under a few circumstances, QCustomPlot causes a replot by itself. Those are resize events of the QCustomPlot widget and user interactions (object selection and range dragging/zooming).

Before the replot happens, the signal beforeReplot is emitted. After the replot, afterReplot is emitted. It is safe to mutually connect the replot slot with any of those two signals on two QCustomPlots to make them replot synchronously, it won't cause an infinite recursion.

If a layer is in mode QCPLayer::lmBuffered (QCPLayer::setMode), it is also possible to replot only that specific layer via QCPLayer::replot. See the documentation there for details.

See also
replotTime

§ replotTime()

double QCustomPlot::replotTime ( bool  average = false) const

Returns the time in milliseconds that the last replot took. If average is set to true, an exponential moving average over the last couple of replots is returned.

See also
replot

§ mouseDoubleClick

void QCustomPlot::mouseDoubleClick ( QMouseEvent *  event)
signal

This signal is emitted when the QCustomPlot receives a mouse double click event.

§ mousePress

void QCustomPlot::mousePress ( QMouseEvent *  event)
signal

This signal is emitted when the QCustomPlot receives a mouse press event.

It is emitted before QCustomPlot handles any other mechanism like range dragging. So a slot connected to this signal can still influence the behaviour e.g. with QCPAxisRect::setRangeDrag or QCPAxisRect::setRangeDragAxes.

§ mouseMove

void QCustomPlot::mouseMove ( QMouseEvent *  event)
signal

This signal is emitted when the QCustomPlot receives a mouse move event.

It is emitted before QCustomPlot handles any other mechanism like range dragging. So a slot connected to this signal can still influence the behaviour e.g. with QCPAxisRect::setRangeDrag or QCPAxisRect::setRangeDragAxes.

Warning
It is discouraged to change the drag-axes with QCPAxisRect::setRangeDragAxes here, because the dragging starting point was saved the moment the mouse was pressed. Thus it only has a meaning for the range drag axes that were set at that moment. If you want to change the drag axes, consider doing this in the mousePress signal instead.

§ mouseRelease

void QCustomPlot::mouseRelease ( QMouseEvent *  event)
signal

This signal is emitted when the QCustomPlot receives a mouse release event.

It is emitted before QCustomPlot handlustomPlot receives a mouse wheel event.

It is emitted before QCustomPlot handles any other mechanisms like range zooming. So a slot connected to this signal can still influence the behaviour e.g. with QCPAxisRect::setRangeZoom, QCPAxisRect::setRangeZoomAxes or QCPAxisRect::setRangeZoomFactor.

§ plottableClick

void QCustomPlot::plottableClick ( QCPAbstractPlottable plottable,
int  dataIndex,
QMouseEvent *  event 
)
signal

This signal is emitted when a plottable is clicked.

event is the mouse event that caused the click and plottable is the plottable that received the click. The parameter dataIndex indicates the data point that was closest to the click position.

See also
plottableDoubleClick

§ plottableDoubleClick

void QCustomPlot::plottableDoubleClick ( QCPAbstractPlottable plottable,
int  dataIndex,
QMouseEvent *  event 
)
signal

This signal is emitted when a plottable is double clicked.

event is the mouse event that caused the click and plottable is the plottable that received the click. The parameter dataIndex indicates the data point that was closest to the click position.

See also
plottableClick

§ itemClick

void QCustomPlot::itemClick ( QCPAbstractItem item,
QMouseEvent *  event 
)
signal

This signal is emitted when an item is clicked.

event is the mouse event that caused the click and item is the item that received the click.

See also
itemDoubleClick

§ itemDoubleClick

void QCustomPlot::itemDoubleClick ( QCPAbstractItem item,
QMouseEvent *  event 
)
signal

This signal is emitted when an item is double clicked.

event is the mouse event that caused the click and item is the item that received the click.

See also
itemClick

§ axisClick

void QCustomPlot::axisClick ( QCPAxis axis,
QCPAxis::SelectablePart  part,
QMouseEvent *  event 
)
signal

This signal is emitted when an axis is clicked.

event is the mouse event that caused the click, axis is the axis that received the click and part indicates the part of the axis that was clicked.

See also
axisDoubleClick

§ axisDoubleClick

void QCustomPlot::axisDoubleClick ( QCPAxis axis,
QCPAxis::SelectablePart  part,
QMouseEvent *  event 
)
signal

This signal is emitted when an axis is double clicked.

event is the mouse event that caused the click, axis is the axis that received the click and part indicates the part of the axis that was clicked.

See also
axisClick

§ legendClick

void QCustomPlot::legendClick ( QCPLegend legend,
QCPAbstractLegendItem item,
QMouseEvent *  event 
)
signal

This signal is emitted when a legend (item) is clicked.

event is the mouse event that caused the click, legend is the legend that received the click and item is the legend item that received the click. If only the legend and no item is clicked, item is nullptr. This happens for a click inside the legend padding or the space between two items.

See also
legendDoubleClick

§ legendDoubleClick

void QCustomPlot::legendDoubleClick ( QCPLegend legend,
QCPAbstractLegendItem item,
QMouseEvent *  event 
)
signal

This signal is emitted when a legend (item) is double clicked.

event is the mouse event that caused the click, legend is the legend that received the click and item is the legend item that received the click. If only the legend and no item is clicked, item is nullptr. This happens for a click inside the legend padding or the space between two items.

See also
legendClick

§ selectionChangedByUser

void QCustomPlot::selectionChangedByUser ( )
signal

This signal is emitted after the user has changed the selection in the QCustomPlot, e.g. by clicking. It is not emitted when the selection state of an object has changed programmatically by a direct call to setSelected()/setSelection() on an object or by calling deselectAll.

In addition to this signal, selectable objects also provide individual signals, for example QCPAxis::selectionChanged or QCPAbstractPlottable::selectionChanged. Note that those signals are emitted even if the selection state is changed programmatically.

See the documentation of setInteractions for details about the selection mechanism.

See also
selectedPlottables, selectedGraphs, selectedItems, selectedAxes, selectedLegends

§ beforeReplot

void QCustomPlot::beforeReplot ( )
signal

This signal is emitted immediately before a replot takes place (caused by a call to the slot replot).

It is safe to mutually connect the replot slot with this signal on two QCustomPlots to make them replot synchronously, it won't cause an infinite recursion.

See also
replot, afterReplot, afterLayout

§ afterLayout

void QCustomPlot::afterLayout ( )
signal

This signal is emitted immediately after the layout step has been completed, which occurs right before drawing the plot. This is typically during a call to replot, and in such cases this signal is emitted in between the signals beforeReplot and afterReplot. Unlike those signals however, this signal is also emitted during off-screen painting, such as when calling toPixmap or savePdf.

The layout step queries all layouts and layout elements in the plot for their proposed size and arranges the objects accordingly as preparation for the subsequent drawing step. Through this signal, you have the opportunity to update certain things in your plot that depend crucially on the exact dimensions/positioning of layout elements such as axes and axis rects.

Warning
However, changing any parameters of this QCustomPlot instance which would normally affect the layouting (e.g. axis range order of magnitudes, tick label sizes, etc.) will not issue a second run of the layout step. It will propagate directly to the draw step and may cause graphical inconsistencies such as overlapping objects, if sizes or positions have changed.
See also
updateLayout, beforeReplot, afterReplot

§ afterReplot

void QCustomPlot::afterReplot ( )
signal

This signal is emitted immediately after a replot has taken place (caused by a call to the slot replot).

It is safe to mutually connect the replot slot with this signal on two QCustomPlots to make them replot synchronously, it won't cause an infinite recursion.

See also
replot, beforeReplot, afterLayout

§ minimumSizeHint()

QSize QCustomPlot::minimumSizeHint ( ) const
protectedvirtual

Returns a minimum size hint that corresponds to the minimum size of the top level layout (plotLayout). To prevent QCustomPlot from being collapsed to size/width zero, set a minimum size (setMinimumSize) either on the whole QCustomPlot or on any layout elements inside the plot. This is especially important, when placed in a QLayout where other components try to take in as much space as possible (e.g. QMdiArea).

§ sizeHint()

QSize QCustomPlot::sizeHint ( ) const
protectedvirtual

Returns a size hint that is the same as minimumSizeHint.

§ paintEvent()

void QCustomPlot::paintEvent ( QPaintEvent *  event)
protectedvirtual

Event handler for when the QCustomPlot widget needs repainting. This does not cause a replot, but draws the internal buffer on the widget surface.

§ resizeEvent()

void QCustomPlot::resizeEvent ( QResizeEvent *  event)
protectedvirtual

Event handler for a resize of the QCustomPlot widget. The viewport (which becomes the outer rect of mPlotLayout) is resized appropriately. Finally a replot is performed.

§ mouseDoubleClickEvent()

void QCustomPlot::mouseDoubleClickEvent ( QMouseEvent *  event)
protectedvirtual

Event handler for when a double click occurs. Emits the mouseDoubleClick signal, then determines the layerable under the cursor and forwards the event to it. Finally, emits the specialized signals when certain objecs are clicked (e.g. plottableDoubleClick, axisDoubleClick, etc.).

See also
mousePressEvent, mouseReleaseEvent

§ mousePressEvent()

void QCustomPlot::mousePressEvent ( QMouseEvent *  event)
protectedvirtual

Event handler for when a mouse button is pressed. Emits the mousePress signal.

If the current setSelectionRectMode is not QCP::srmNone, passes the event to the selection rect. Otherwise determines the layerable under the cursor and forwards the event to it.

See also
mouseMoveEvent, mouseReleaseEvent

§ mouseMoveEvent()

void QCustomPlot::mouseMoveEvent ( QMouseEvent *  event)
protectedvirtual

Event handler for when the cursor is moved. Emits the mouseMove signal.

If the selection rect (setSelectionRect) is currently active, the event is forwarded to it in order to update the rect geometry.

Otherwise, if a layout element has mouse capture focus (a mousePressEvent happened on top of the layout element before), the mouseMoveEvent is forwarded to that element.

See also
mousePressEvent, mouseReleaseEvent

§ mouseReleaseEvent()

void QCustomPlot::mouseReleaseEvent ( QMouseEvent *  QCPAbstractPaintBuffer * QCustomPlot::createPaintBuffer ( )
protected

This method is used by setupPaintBuffers when it needs to create new paint buffers.

Depending on the current setting of setOpenGl, and the current Qt version, different backends (subclasses of QCPAbstractPaintBuffer) are created, initialized with the proper size and device pixel ratio, and returned.

§ hasInvalidatedPaintBuffers()

bool QCustomPlot::hasInvalidatedPaintBuffers ( )
protected

This method returns whether any of the paint buffers held by this QCustomPlot instance are invalidated.

If any buffer is invalidated, a partial replot (QCPLayer::replot) is not allowed and always causes a full replot (QCustomPlot::replot) of all layers. This is the case when for example the layer order has changed, new layers were added or removed, layer modes were changed (QCPLayer::setMode), or layerables were added or removed.

See also
QCPAbstractPaintBuffer::setInvalidated

§ setupOpenGl()

bool QCustomPlot::setupOpenGl ( )
protected

When setOpenGl is set to true, this method is used to initialize OpenGL (create a context, surface, paint device).

Returns true on success.

If this method is successful, all paint buffers should be deleted and then reallocated by calling setupPaintBuffers, so the OpenGL-based paint buffer subclasses (QCPPaintBufferGlPbuffer, QCPPaintBufferGlFbo) are used for subsequent replots.

See also
freeOpenGl

§ freeOpenGl()

void QCustomPlot::freeOpenGl ( )
protected

When setOpenGl is set to false, this method is used to deinitialize OpenGL (releases the context and frees resources).

After OpenGL is disabled, all paint buffers should be deleted and then reallocated by calling setupPaintBuffers, so the standard software rendering paint buffer subclass (QCPPaintBufferPixmap) is used for subsequent replots.

See also
setupOpenGl

Field Documentation

§ xAxis

QCPAxis * QCustomPlot::xAxis

A pointer to the primary x Axis (bottom) of the main axis rect of the plot.

QCustomPlot offers convenient pointers to the axes (xAxis, yAxis, xAxis2, yAxis2) and the legend. They make it very easy working with plots that only have a single axis rect and at most one axis at each axis rect side. If you use the layout system to add multiple axis rects or multiple axes to one side, use the QCPAxisRect::axis interface to access the new axes. If one of the four default axes or the default legend is removed due to manipulation of the layout system (e.g. by removing the main axis rect), the corresponding pointers become nullptr.

If an axis convenience pointer is currently nullptr and a new axis rect or a corresponding axis is added in the place of the main axis rect, QCustomPlot resets the convenience pointers to the according new axes. Similarly the legend convenience pointer will be reset if a legend is added after the main legend was removed before.

§ yAxis

QCPAxis * QCustomPlot::yAxis

A pointer to the primary y Axis (left) of the main axis rect of the plot.

QCustomPlot offers convenient pointers to the axes (xAxis, yAxis, xAxis2, yAxis2) and the legend. They make it very easy working with plots that only have a single axis rect and at most one axis at each axis rect side. If you use the layout system to add multiple axis rects or multiple axes to one side, use the QCPAxisRect::axis interface to access the new axes. If one of the four default axes or the default legend is removed due to manipulation of the layout system (e.g. by removing the main axis rect), the corresponding pointers become nullptr.

If an axis convenience pointer is currently nullptr and a new axis rect or a corresponding axis is added in the place of the main axis rect, QCustomPlot resets the convenience pointers to the according new axes. Similarly the legend convenience pointer will be reset if a legend is added after the main legend was removed before.

§ xAxis2

QCPAxis * QCustomPlot::xAxis2

A pointer to the secondary x Axis (top) of the main axis rect of the plot. Secondary axes are invisible by default. Use QCPAxis::setVisible to change this (or use QCPAxisRect::setupFullAxesBox).

QCustomPlot offers convenient pointers to the axes (xAxis, yAxis, xAxis2, yAxis2) and the legend. They make it very easy working with plots that only have a single axis rect and at most one axis at each axis rect side. If you use the layout system to add multiple axis rects or multiple axes to one side, use the QCPAxisRect::axis interface to access the new axes. If one of the four default axes or the default legend is removed due to manipulation of the layout system (e.g. by removing the main axis rect), the corresponding pointers become nullptr.

If an axis convenience pointer is currently nullptr and a new axis rect or a corresponding axis is added in the place of the main axis rect, QCustomPlot resets the convenience pointers to the according new axes. Similarly the legend convenience pointer will be reset if a legend is added after the main legend was removed before.

§ yAxis2

QCPAxis * QCustomPlot::yAxis2

A pointer to the secondary y Axis (right) of the main axis rect of the plot. Secondary axes are invisible by default. Use QCPAxis::setVisible to change this (or use QCPAxisRect::setupFullAxesBox).

QCustomPlot offers convenient pointers to the axes (xAxis, yAxis, xAxis2, yAxis2) and the legend. They make it very easy working with plots that only have a single axis rect and at most one axis at each axis rect side. If you use the layout system to add multiple axis rects or multiple axes to one side, use the QCPAxisRect::axis interface to access the new axes. If one of the four default axes or the default legend is removed due to manipulation of the layout system (e.g. by removing the main axis rect), the corresponding pointers become nullptr.

If an axis convenience pointer is currently nullptr and a new axis rect or a corresponding axis is added in the place of the main axis rect, QCustomPlot resets the convenience pointers to the according new axes. Similarly the legend convenience pointer will be reset if a legend is added after the main legend was removed before.

§ legend

QCPLegend * QCustomPlot::legend

A pointer to the default legend of the main axis rect. The legend is invisible by default. Use QCPLegend::setVisible to change this.

QCustomPlot offers convenient pointers to the axes (xAxis, yAxis, xAxis2, yAxis2) and the legend. They make it very easy working with plots that only have a single axis rect and at most one axis at each axis rect side. If you use the layout system to add multiple legends to the plot, use the layout system interface to access the new legend. For example, legends can be placed inside an axis rect's inset layout, and must then also be accessed via the inset layout. If the default legend is removed due to manipulation of the layout system (e.g. by removing the main axis rect), the corresponding pointer becomes nullptr.

If an axis convenience pointer is currently nullptr and a new axis rect or a corresponding axis is added in the place of the main axis rect, QCustomPlot resets the convenience pointers to the according new axes. Similarly the legend convenience pointer will be reset if a legend is added after the main legend was removed before.


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