QCPItemCurve Class Reference

Inheritance diagram for QCPItemCurve:

Public Member Functions
	QCPItemCurve (QCustomPlot *parentPlot)
QCPLineEnding	head () const
QPen	pen () const
QPen	selectedPen () const
virtual double	selectTest (const QPointF &pos, bool onlySelectable, QVariant *details=nullptr) const override
void	setHead (const QCPLineEnding &head)
void	setPen (const QPen &pen)
void	setSelectedPen (const QPen &pen)
void	setTail (const QCPLineEnding &tail)
QCPLineEnding	tail () const
Public Member Functions inherited from QCPAbstractItem
	QCPAbstractItem (QCustomPlot *parentPlot)
QCPItemAnchor *	anchor (const QString &name) const
QList< QCPItemAnchor * >	anchors () const
QCPAxisRect *	clipAxisRect () const
bool	clipToAxisRect () const
bool	hasAnchor (const QString &name) const
QCPItemPosition *	position (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
QCPLayer *	layer () const
QCPLayerable *	parentLayerable () const
QCustomPlot *	parentPlot () 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< QString >	bindableObjectName ()
bool	blockSignals (bool block)
const QObjectList &	children () 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< QByteArray >	dynamicPropertyNames () const const
virtual bool	event (QEvent *e)
virtual bool	eventFilter (QObject *watched, QEvent *event)
T	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 QMetaObject *	metaObject () const const
void	moveToThread (QThread *targetThread)
QString	objectName () const const
void	objectNameChanged (const QString &objectName)
QObject *	parent () const const
QVariant	property (const char *name) const const
	Q_CLASSINFO (Name, Value)
	Q_EMIT Q_EMIT
	Q_ENUM (...)
	Q_ENUM_NS (...)
	Q_ENUMS (...)
	Q_FLAG (...)
	Q_FLAG_NS (...)
	Q_FLAGS (...)
	Q_GADGET Q_GADGET
	Q_GADGET_EXPORT (EXPORT_MACRO)
	Q_INTERFACES (...)
	Q_INVOKABLE Q_INVOKABLE
	Q_MOC_INCLUDE Q_MOC_INCLUDE
	Q_NAMESPACE Q_NAMESPACE
	Q_NAMESPACE_EXPORT (EXPORT_MACRO)
	Q_OBJECT Q_OBJECT
	Q_PROPERTY (...)
	Q_REVISION Q_REVISION
	Q_SET_OBJECT_NAME (Object)
	Q_SIGNAL Q_SIGNAL
	Q_SIGNALS Q_SIGNALS
	Q_SLOT Q_SLOT
	Q_SLOTS Q_SLOTS
T	qobject_cast (const QObject *object)
T	qobject_cast (QObject *object)
	QT_NO_NARROWING_CONVERSIONS_IN_CONNECT QT_NO_NARROWING_CONVERSIONS_IN_CONNECT
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)
QThread *	thread () const const

Public Attributes
QCPItemPosition *const	end
QCPItemPosition *const	endDir
QCPItemPosition *const	start
QCPItemPosition *const	startDir

Protected Member Functions
virtual void	draw (QCPPainter *painter) override
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
QCPItemAnchor *	createAnchor (const QString &name, int anchorId)
QCPItemPosition *	createPosition (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
QObject *	sender () const const
int	senderSignalIndex () const const
virtual void	timerEvent (QTimerEvent *event)

Protected Attributes
QCPLineEnding	mHead
QPen	mPen
QPen	mSelectedPen
QCPLineEnding	mTail
Protected Attributes inherited from QCPAbstractItem
QList< QCPItemAnchor * >	mAnchors
QPointer< QCPAxisRect >	mClipAxisRect
bool	mClipToAxisRect
QList< QCPItemPosition * >	mPositions
bool	mSelectable
bool	mSelected
Protected Attributes inherited from QCPLayerable
bool	mAntialiased
QCPLayer *	mLayer
QPointer< QCPLayerable >	mParentLayerable
QCustomPlot *	mParentPlot
bool	mVisible

Additional Inherited Members
Public Types inherited from QObject
typedef	QObjectList
Properties inherited from QObject
	objectName
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

A curved line from one point to another.

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

It has four positions, start and end, which define the end points of the line, and two control points which define the direction the line exits from the start and the direction from which it approaches the end: startDir and endDir.

With setHead and setTail you may set different line ending styles, e.g. to create an arrow.

Often it is desirable for the control points to stay at fixed relative positions to the start/end point. This can be achieved by setting the parent anchor e.g. of startDir simply to start, and then specify the desired pixel offset with QCPItemPosition::setCoords on startDir.

Definition at line 6515 of file qcustomplot.h.

Constructor & Destructor Documentation

QCPItemCurve()

QCPItemCurve::QCPItemCurve ( QCustomPlot * parentPlot )

explicit

Creates a curve 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 29296 of file qcustomplot.cpp.

~QCPItemCurve()

QCPItemCurve::~QCPItemCurve ( )

overridevirtual

Definition at line 29312 of file qcustomplot.cpp.

Member Function Documentation

draw()

void QCPItemCurve::draw ( QCPPainter * painter )

overrideprotectedvirtual

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 29393 of file qcustomplot.cpp.

head()

QCPLineEnding QCPItemCurve::head ( ) const

inline

Definition at line 6531 of file qcustomplot.h.

mainPen()

QPen QCPItemCurve::mainPen ( ) const

protected

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 29428 of file qcustomplot.cpp.

pen()

QPen QCPItemCurve::pen ( ) const

inline

Definition at line 6529 of file qcustomplot.h.

selectedPen()

QPen QCPItemCurve::selectedPen ( ) const

inline

Definition at line 6530 of file qcustomplot.h.

selectTest()

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

overridevirtual

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 29363 of file qcustomplot.cpp.

setHead()

void QCPItemCurve::setHead

(

const QCPLineEnding &

head

)

Sets the line ending style of the head. The head corresponds to the end position.

Note that due to the overloaded QCPLineEnding constructor, you may directly specify a QCPLineEnding::EndingStyle here, e.g.

setHead(QCPLineEnding::esSpikeArrow) 

See also

setTail

Definition at line 29344 of file qcustomplot.cpp.

setPen()

void QCPItemCurve::setPen

(

const QPen &

pen

)

Sets the pen that will be used to draw the line

See also

setSelectedPen

Definition at line 29321 of file qcustomplot.cpp.

setSelectedPen()

void QCPItemCurve::setSelectedPen

(

const QPen &

pen

)

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

See also

setPen, setSelected

Definition at line 29331 of file qcustomplot.cpp.

setTail()

void QCPItemCurve::setTail

(

const QCPLineEnding &

tail

)

Sets the line ending style of the tail. The tail corresponds to the start position.

Note that due to the overloaded QCPLineEnding constructor, you may directly specify a QCPLineEnding::EndingStyle here, e.g.

setTail(QCPLineEnding::esSpikeArrow) 

See also

setHead

Definition at line 29357 of file qcustomplot.cpp.

tail()

QCPLineEnding QCPItemCurve::tail ( ) const

inline

Definition at line 6532 of file qcustomplot.h.

Member Data Documentation

end

QCPItemPosition* const QCPItemCurve::end

Definition at line 6546 of file qcustomplot.h.

endDir

QCPItemPosition* const QCPItemCurve::endDir

Definition at line 6545 of file qcustomplot.h.

mHead

QCPLineEnding QCPItemCurve::mHead

protected

Definition at line 6551 of file qcustomplot.h.

mPen

QPen QCPItemCurve::mPen

protected

Definition at line 6550 of file qcustomplot.h.

mSelectedPen

QPen QCPItemCurve::mSelectedPen

protected

Definition at line 6550 of file qcustomplot.h.

mTail

QCPLineEnding QCPItemCurve::mTail

protected

Definition at line 6551 of file qcustomplot.h.

start

QCPItemPosition* const QCPItemCurve::start

Definition at line 6543 of file qcustomplot.h.

startDir

QCPItemPosition* const QCPItemCurve::startDir

Definition at line 6544 of file qcustomplot.h.

---

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

• qcustomplot.h
• qcustomplot.cpp