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Inheritance diagram for QCPItemTracer:

Public Types

enum  TracerStyle {
  tsNone , tsPlus , tsCrosshair , tsCircle ,

Public Member Functions

 QCPItemTracer (QCustomPlot *parentPlot)
QBrush brush () const
QCPGraphgraph () const
double graphKey () const
bool interpolating () const
QPen pen () const
QBrush selectedBrush () const
QPen selectedPen () const
virtual double selectTest (const QPointF &pos, bool onlySelectable, QVariant *details=nullptr) const override
void setBrush (const QBrush &brush)
void setGraph (QCPGraph *graph)
void setGraphKey (double key)
void setInterpolating (bool enabled)
void setPen (const QPen &pen)
void setSelectedBrush (const QBrush &brush)
void setSelectedPen (const QPen &pen)
void setSize (double size)
void setStyle (TracerStyle style)
double size () const
TracerStyle style () const
void updatePosition ()
- Public Member Functions inherited from QCPAbstractItem
 QCPAbstractItem (QCustomPlot *parentPlot)
QCPItemAnchoranchor (const QString &name) const
QList< QCPItemAnchor * > anchors () const
QCPAxisRectclipAxisRect () const
bool clipToAxisRect () const
bool hasAnchor (const QString &name) const
QCPItemPositionposition (const QString &name) const
QList< QCPItemPosition * > positions () const
bool selectable () const
bool selected () const
void setClipAxisRect (QCPAxisRect *rect)
void setClipToAxisRect (bool clip)
Q_SLOT void setSelectable (bool selectable)
Q_SLOT void setSelected (bool selected)
- Public Member Functions inherited from QCPLayerable
 QCPLayerable (QCustomPlot *plot, QString targetLayer=QString(), QCPLayerable *parentLayerable=nullptr)
bool antialiased () const
QCPLayerlayer () const
QCPLayerableparentLayerable () const
QCustomPlotparentPlot () const
bool realVisibility () const
void setAntialiased (bool enabled)
bool setLayer (const QString &layerName)
Q_SLOT bool setLayer (QCPLayer *layer)
void setVisible (bool on)
bool visible () const
- Public Member Functions inherited from QObject
 QObject (QObject *parent)
QBindable< QStringbindableObjectName ()
bool blockSignals (bool block)
const QObjectListchildren () const const
QMetaObject::Connection connect (const QObject *sender, const char *signal, const char *method, Qt::ConnectionType type) const const
void deleteLater ()
void destroyed (QObject *obj)
bool disconnect (const char *signal, const QObject *receiver, const char *method) const const
bool disconnect (const QObject *receiver, const char *method) const const
void dumpObjectInfo () const const
void dumpObjectTree () const const
QList< QByteArraydynamicPropertyNames () const const
virtual bool event (QEvent *e)
virtual bool eventFilter (QObject *watched, QEvent *event)
findChild (const QString &name, Qt::FindChildOptions options) const const
QList< T > findChildren (const QRegularExpression &re, Qt::FindChildOptions options) const const
QList< T > findChildren (const QString &name, Qt::FindChildOptions options) const const
QList< T > findChildren (Qt::FindChildOptions options) const const
bool inherits (const char *className) const const
void installEventFilter (QObject *filterObj)
bool isQuickItemType () const const
bool isWidgetType () const const
bool isWindowType () const const
void killTimer (int id)
virtual const QMetaObjectmetaObject () const const
void moveToThread (QThread *targetThread)
QString objectName () const const
void objectNameChanged (const QString &objectName)
QObjectparent () const const
QVariant property (const char *name) const const
 Q_CLASSINFO (Name, Value)
 Q_ENUM (...)
 Q_ENUM_NS (...)
 Q_ENUMS (...)
 Q_FLAG (...)
 Q_FLAG_NS (...)
 Q_FLAGS (...)
qobject_cast (const QObject *object)
qobject_cast (QObject *object)
void removeEventFilter (QObject *obj)
void setObjectName (const QString &name)
void setObjectName (QAnyStringView name)
void setParent (QObject *parent)
bool setProperty (const char *name, const QVariant &value)
bool setProperty (const char *name, QVariant &&value)
bool signalsBlocked () const const
int startTimer (int interval, Qt::TimerType timerType)
int startTimer (std::chrono::milliseconds interval, Qt::TimerType timerType)
QThreadthread () const const

Public Attributes

QCPItemPosition *const position
- Public Attributes inherited from QObject
typedef QObjectList

Protected Member Functions

virtual void draw (QCPPainter *painter) override
QBrush mainBrush () const
QPen mainPen () const
- Protected Member Functions inherited from QCPAbstractItem
virtual QPointF anchorPixelPosition (int anchorId) const
virtual void applyDefaultAntialiasingHint (QCPPainter *painter) const override
virtual QRect clipRect () const override
QCPItemAnchorcreateAnchor (const QString &name, int anchorId)
QCPItemPositioncreatePosition (const QString &name)
virtual void deselectEvent (bool *selectionStateChanged) override
double rectDistance (const QRectF &rect, const QPointF &pos, bool filledRect) const
virtual void selectEvent (QMouseEvent *event, bool additive, const QVariant &details, bool *selectionStateChanged) override
virtual QCP::Interaction selectionCategory () const override
- Protected Member Functions inherited from QCPLayerable
void applyAntialiasingHint (QCPPainter *painter, bool localAntialiased, QCP::AntialiasedElement overrideElement) const
void initializeParentPlot (QCustomPlot *parentPlot)
virtual void mouseDoubleClickEvent (QMouseEvent *event, const QVariant &details)
virtual void mouseMoveEvent (QMouseEvent *event, const QPointF &startPos)
virtual void mousePressEvent (QMouseEvent *event, const QVariant &details)
virtual void mouseReleaseEvent (QMouseEvent *event, const QPointF &startPos)
bool moveToLayer (QCPLayer *layer, bool prepend)
virtual void parentPlotInitialized (QCustomPlot *parentPlot)
void setParentLayerable (QCPLayerable *parentLayerable)
virtual void wheelEvent (QWheelEvent *event)
- Protected Member Functions inherited from QObject
virtual void childEvent (QChildEvent *event)
virtual void connectNotify (const QMetaMethod &signal)
virtual void customEvent (QEvent *event)
virtual void disconnectNotify (const QMetaMethod &signal)
bool isSignalConnected (const QMetaMethod &signal) const const
int receivers (const char *signal) const const
QObjectsender () const const
int senderSignalIndex () const const
virtual void timerEvent (QTimerEvent *event)

Protected Attributes

QBrush mBrush
double mGraphKey
bool mInterpolating
QPen mPen
QBrush mSelectedBrush
QPen mSelectedPen
double mSize
TracerStyle mStyle
- Protected Attributes inherited from QCPAbstractItem
QList< QCPItemAnchor * > mAnchors
QPointer< QCPAxisRectmClipAxisRect
bool mClipToAxisRect
QList< QCPItemPosition * > mPositions
bool mSelectable
bool mSelected
- Protected Attributes inherited from QCPLayerable
bool mAntialiased
QPointer< QCPLayerablemParentLayerable
bool mVisible

Additional Inherited Members

- Properties inherited from QObject
- Signals inherited from QCPAbstractItem
void selectableChanged (bool selectable)
void selectionChanged (bool selected)
- Signals inherited from QCPLayerable
void layerChanged (QCPLayer *newLayer)
- Static Public Member Functions inherited from QObject
QMetaObject::Connection connect (const QObject *sender, const char *signal, const QObject *receiver, const char *method, Qt::ConnectionType type)
QMetaObject::Connection connect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type)
QMetaObject::Connection connect (const QObject *sender, PointerToMemberFunction signal, const QObject *context, Functor functor, Qt::ConnectionType type)
QMetaObject::Connection connect (const QObject *sender, PointerToMemberFunction signal, const QObject *receiver, PointerToMemberFunction method, Qt::ConnectionType type)
QMetaObject::Connection connect (const QObject *sender, PointerToMemberFunction signal, Functor functor)
bool disconnect (const QMetaObject::Connection &connection)
bool disconnect (const QObject *sender, const char *signal, const QObject *receiver, const char *method)
bool disconnect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method)
bool disconnect (const QObject *sender, PointerToMemberFunction signal, const QObject *receiver, PointerToMemberFunction method)
QString tr (const char *sourceText, const char *disambiguation, int n)

Detailed Description

Item that sticks to QCPGraph data points.

Tracer example. Blue dotted circles are anchors, solid blue discs are positions.

The tracer can be connected with a QCPGraph via setGraph. Then it will automatically adopt the coordinate axes of the graph and update its position to be on the graph's data. This means the key stays controllable via setGraphKey, but the value will follow the graph data. If a QCPGraph is connected, note that setting the coordinates of the tracer item directly via position will have no effect because they will be overriden in the next redraw (this is when the coordinate update happens).

If the specified key in setGraphKey is outside the key bounds of the graph, the tracer will stay at the corresponding end of the graph.

With setInterpolating you may specify whether the tracer may only stay exactly on data points or whether it interpolates data points linearly, if given a key that lies between two data points of the graph.

The tracer has different visual styles, see setStyle. It is also possible to make the tracer have no own visual appearance (set the style to tsNone), and just connect other item positions to the tracer position (used as an anchor) via QCPItemPosition::setParentAnchor.

The tracer position is only automatically updated upon redraws. So when the data of the graph changes and immediately afterwards (without a redraw) the position coordinates of the tracer are retrieved, they will not reflect the updated data of the graph. In this case updatePosition must be called manually, prior to reading the tracer coordinates.

Definition at line 6795 of file qcustomplot.h.

Member Enumeration Documentation

◆ TracerStyle

The different visual appearances a tracer item can have. Some styles size may be controlled with setSize.

See also

The tracer is not visible.


A plus shaped crosshair with limited size.


A plus shaped crosshair which spans the complete axis rect.


A circle.


A square.

Definition at line 6815 of file qcustomplot.h.

Constructor & Destructor Documentation

◆ QCPItemTracer()

QCPItemTracer::QCPItemTracer ( QCustomPlot * parentPlot)

Creates a tracer item and sets default values.

The created item is automatically registered with parentPlot. This QCustomPlot instance takes ownership of the item, so do not delete it manually but use QCustomPlot::removeItem() instead.

Definition at line 30422 of file qcustomplot.cpp.

◆ ~QCPItemTracer()

QCPItemTracer::~QCPItemTracer ( )

Definition at line 30439 of file qcustomplot.cpp.

Member Function Documentation

◆ brush()

QBrush QCPItemTracer::brush ( ) const

Definition at line 6829 of file qcustomplot.h.

◆ draw()

void QCPItemTracer::draw ( QCPPainter * painter)

Draws this item with the provided painter.

The cliprect of the provided painter is set to the rect returned by clipRect before this function is called. The clipRect depends on the clipping settings defined by setClipToAxisRect and setClipAxisRect.

Implements QCPAbstractItem.

Definition at line 30619 of file qcustomplot.cpp.

◆ graph()

QCPGraph * QCPItemTracer::graph ( ) const

Definition at line 6833 of file qcustomplot.h.

◆ graphKey()

double QCPItemTracer::graphKey ( ) const

Definition at line 6834 of file qcustomplot.h.

◆ interpolating()

bool QCPItemTracer::interpolating ( ) const

Definition at line 6835 of file qcustomplot.h.

◆ mainBrush()

QBrush QCPItemTracer::mainBrush ( ) const

Returns the brush that should be used for drawing fills of the item. Returns mBrush when the item is not selected and mSelectedBrush when it is.

Definition at line 30742 of file qcustomplot.cpp.

◆ mainPen()

QPen QCPItemTracer::mainPen ( ) const

Returns the pen that should be used for drawing lines. Returns mPen when the item is not selected and mSelectedPen when it is.

Definition at line 30732 of file qcustomplot.cpp.

◆ pen()

QPen QCPItemTracer::pen ( ) const

Definition at line 6827 of file qcustomplot.h.

◆ selectedBrush()

QBrush QCPItemTracer::selectedBrush ( ) const

Definition at line 6830 of file qcustomplot.h.

◆ selectedPen()

QPen QCPItemTracer::selectedPen ( ) const

Definition at line 6828 of file qcustomplot.h.

◆ selectTest()

double QCPItemTracer::selectTest ( const QPointF & pos,
bool onlySelectable,
QVariant * details = nullptr ) const

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 object is represented not by single lines but by an area like a QCPItemText or the bars of a QCPBars plottable, a click inside the area should also be considered a hit. In these cases this function thus returns a constant value greater zero but still below the parent plot's selection tolerance. (typically the selectionTolerance multiplied by 0.99).

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.

In the case of 1D Plottables (QCPAbstractPlottable1D, like QCPGraph or QCPBars) details will be set to a QCPDataSelection, describing the closest data point to pos.

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

See also
selectEvent, deselectEvent, mousePressEvent, wheelEvent, QCustomPlot::setInteractions, QCPAbstractPlottable1D::selectTestRect

Implements QCPAbstractItem.

Definition at line 30562 of file qcustomplot.cpp.

◆ setBrush()

void QCPItemTracer::setBrush ( const QBrush & brush)

Sets the brush that will be used to draw any fills of the tracer

See also
setSelectedBrush, setPen

Definition at line 30468 of file qcustomplot.cpp.

◆ setGraph()

void QCPItemTracer::setGraph ( QCPGraph * graph)

Sets the QCPGraph this tracer sticks to. The tracer position will be set to type QCPItemPosition::ptPlotCoords and the axes will be set to the axes of graph.

To free the tracer from any graph, set graph to nullptr. The tracer position can then be placed freely like any other item position. This is the state the tracer will assume when its graph gets deleted while still attached to it.

See also

Definition at line 30513 of file qcustomplot.cpp.

◆ setGraphKey()

void QCPItemTracer::setGraphKey ( double key)

Sets the key of the graph's data point the tracer will be positioned at. This is the only free coordinate of a tracer when attached to a graph.

Depending on setInterpolating, the tracer will be either positioned on the data point closest to key, or will stay exactly at key and interpolate the value linearly.

See also
setGraph, setInterpolating

Definition at line 30540 of file qcustomplot.cpp.

◆ setInterpolating()

void QCPItemTracer::setInterpolating ( bool enabled)

Sets whether the value of the graph's data points shall be interpolated, when positioning the tracer.

If enabled is set to false and a key is given with setGraphKey, the tracer is placed on the data point of the graph which is closest to the key, but which is not necessarily exactly there. If enabled is true, the tracer will be positioned exactly at the specified key, and the appropriate value will be interpolated from the graph's data points linearly.

See also
setGraph, setGraphKey

Definition at line 30556 of file qcustomplot.cpp.

◆ setPen()

void QCPItemTracer::setPen ( const QPen & pen)

Sets the pen that will be used to draw the line of the tracer

See also
setSelectedPen, setBrush

Definition at line 30448 of file qcustomplot.cpp.

◆ setSelectedBrush()

void QCPItemTracer::setSelectedBrush ( const QBrush & brush)

Sets the brush that will be used to draw any fills of the tracer, when selected.

See also
setBrush, setSelected

Definition at line 30478 of file qcustomplot.cpp.

◆ setSelectedPen()

void QCPItemTracer::setSelectedPen ( const QPen & pen)

Sets the pen that will be used to draw the line of the tracer when selected

See also
setPen, setSelected

Definition at line 30458 of file qcustomplot.cpp.

◆ setSize()

void QCPItemTracer::setSize ( double size)

Sets the size of the tracer in pixels, if the style supports setting a size (e.g. tsSquare does, tsCrosshair does not).

Definition at line 30487 of file qcustomplot.cpp.

◆ setStyle()

void QCPItemTracer::setStyle ( QCPItemTracer::TracerStyle style)

Sets the style/visual appearance of the tracer.

If you only want to use the tracer position as an anchor for other items, set style to tsNone.

Definition at line 30498 of file qcustomplot.cpp.

◆ size()

double QCPItemTracer::size ( ) const

Definition at line 6831 of file qcustomplot.h.

◆ style()

TracerStyle QCPItemTracer::style ( ) const

Definition at line 6832 of file qcustomplot.h.

◆ updatePosition()

void QCPItemTracer::updatePosition ( )

If the tracer is connected with a graph (setGraph), this function updates the tracer's position to reside on the graph data, depending on the configured key (setGraphKey).

It is called automatically on every redraw and normally doesn't need to be called manually. One exception is when you want to read the tracer coordinates via position and are not sure that the graph's data (or the tracer key with setGraphKey) hasn't changed since the last redraw. In that situation, call this function before accessing position, to make sure you don't get out-of-date coordinates.

If there is no graph set on this tracer, this function does nothing.

Definition at line 30677 of file qcustomplot.cpp.

Member Data Documentation

◆ mBrush

QBrush QCPItemTracer::mBrush

Definition at line 6859 of file qcustomplot.h.

◆ mGraph

QCPGraph* QCPItemTracer::mGraph

Definition at line 6862 of file qcustomplot.h.

◆ mGraphKey

double QCPItemTracer::mGraphKey

Definition at line 6863 of file qcustomplot.h.

◆ mInterpolating

bool QCPItemTracer::mInterpolating

Definition at line 6864 of file qcustomplot.h.

◆ mPen

QPen QCPItemTracer::mPen

Definition at line 6858 of file qcustomplot.h.

◆ mSelectedBrush

QBrush QCPItemTracer::mSelectedBrush

Definition at line 6859 of file qcustomplot.h.

◆ mSelectedPen

QPen QCPItemTracer::mSelectedPen

Definition at line 6858 of file qcustomplot.h.

◆ mSize

double QCPItemTracer::mSize

Definition at line 6860 of file qcustomplot.h.

◆ mStyle

TracerStyle QCPItemTracer::mStyle

Definition at line 6861 of file qcustomplot.h.

◆ position

QCPItemPosition* const QCPItemTracer::position

Definition at line 6854 of file qcustomplot.h.

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