QCPItemEllipse Class Reference

An ellipse. More...

Inheritance diagram for QCPItemEllipse:

Public Functions
	QCPItemEllipse (QCustomPlot *parentPlot)
QPen	pen () const
QPen	selectedPen () const
QBrush	brush () const
QBrush	selectedBrush () const
void	setPen (const QPen &pen)
void	setSelectedPen (const QPen &pen)
void	setBrush (const QBrush &brush)
void	setSelectedBrush (const QBrush &brush)
virtual double	selectTest (const QPointF &pos, bool onlySelectable, QVariant *details=0) const
Public Functions inherited from QCPAbstractItem
	QCPAbstractItem (QCustomPlot *parentPlot)
bool	clipToAxisRect () const
QCPAxisRect *	clipAxisRect () const
bool	selectable () const
bool	selected () const
void	setClipToAxisRect (bool clip)
void	setClipAxisRect (QCPAxisRect *rect)
Q_SLOT void	setSelectable (bool selectable)
Q_SLOT void	setSelected (bool selected)
QList< QCPItemPosition * >	positions () const
QList< QCPItemAnchor * >	anchors () const
QCPItemPosition *	position (const QString &name) const
QCPItemAnchor *	anchor (const QString &name) const
bool	hasAnchor (const QString &name) const
Public Functions inherited from QCPLayerable
	QCPLayerable (QCustomPlot *plot, QString targetLayer=QString(), QCPLayerable *parentLayerable=0)
bool	visible () const
QCustomPlot *	parentPlot () const
QCPLayerable *	parentLayerable () const
QCPLayer *	layer () const
bool	antialiased () const
void	setVisible (bool on)
Q_SLOT bool	setLayer (QCPLayer *layer)
bool	setLayer (const QString &layerName)
void	setAntialiased (bool enabled)
bool	realVisibility () const

Public Members
QCPItemPosition *const	topLeft
QCPItemPosition *const	bottomRight
QCPItemAnchor *const	topLeftRim
QCPItemAnchor *const	top
QCPItemAnchor *const	topRightRim
QCPItemAnchor *const	right
QCPItemAnchor *const	bottomRightRim
QCPItemAnchor *const	bottom
QCPItemAnchor *const	bottomLeftRim
QCPItemAnchor *const	left
QCPItemAnchor *const	center

Protected Types
enum	AnchorIndex

Protected Functions
virtual void	draw (QCPPainter *painter)
virtual QPointF	anchorPixelPoint (int anchorId) const
QPen	mainPen () const
QBrush	mainBrush () const
Protected Functions inherited from QCPAbstractItem
virtual QCP::Interaction	selectionCategory () const
virtual QRect	clipRect () const
virtual void	applyDefaultAntialiasingHint (QCPPainter *painter) const
virtual void	selectEvent (QMouseEvent *event, bool additive, const QVariant &details, bool *selectionStateChanged)
virtual void	deselectEvent (bool *selectionStateChanged)
double	distSqrToLine (const QPointF &start, const QPointF &end, const QPointF &point) const
double	rectSelectTest (const QRectF &rect, const QPointF &pos, bool filledRect) const
QCPItemPosition *	createPosition (const QString &name)
QCPItemAnchor *	createAnchor (const QString &name, int anchorId)
Protected Functions inherited from QCPLayerable
virtual void	parentPlotInitialized (QCustomPlot *parentPlot)
void	initializeParentPlot (QCustomPlot *parentPlot)
void	setParentLayerable (QCPLayerable *parentLayerable)
bool	moveToLayer (QCPLayer *layer, bool prepend)
void	applyAntialiasingHint (QCPPainter *painter, bool localAntialiased, QCP::AntialiasedElement overrideElement) const

Additional Inherited Members
Signals inherited from QCPAbstractItem
void	selectionChanged (bool selected)
void	selectableChanged (bool selectable)
Signals inherited from QCPLayerable
void	layerChanged (QCPLayer *newLayer)

Detailed Description

An ellipse.

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

It has two positions, topLeft and bottomRight, which define the rect the ellipse will be drawn in.

Constructor & Destructor Documentation

QCPItemEllipse::QCPItemEllipse

(

QCustomPlot *

parentPlot

)

Creates an ellipse item and sets default values.

The constructed item can be added to the plot with QCustomPlot::addItem.

Member Function Documentation

void QCPItemEllipse::setPen

(

const QPen &

pen

)

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

See Also

setSelectedPen, setBrush

void QCPItemEllipse::setSelectedPen

(

const QPen &

pen

)

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

See Also

setPen, setSelected

void QCPItemEllipse::setBrush

(

const QBrush &

brush

)

Sets the brush that will be used to fill the ellipse. To disable filling, set brush to Qt::NoBrush.

See Also

setSelectedBrush, setPen

void QCPItemEllipse::setSelectedBrush

(

const QBrush &

brush

)

Sets the brush that will be used to fill the ellipse when selected. To disable filling, set brush to Qt::NoBrush.

See Also

setBrush

double QCPItemEllipse::selectTest ( const QPointF &  pos, bool  onlySelectable, QVariant *  details = 0  ) const

virtual

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

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

If the 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.

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

See Also

selectEvent, deselectEvent, QCustomPlot::setInteractions

Implements QCPAbstractItem.

void QCPItemEllipse::draw ( QCPPainter *  painter )

protectedvirtual

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.

QPointF QCPItemEllipse::anchorPixelPoint ( int  anchorId ) const

protectedvirtual

Returns the pixel position of the anchor with Id anchorId. This function must be reimplemented in item subclasses if they want to provide anchors (QCPItemAnchor).

For example, if the item has two anchors with id 0 and 1, this function takes one of these anchor ids and returns the respective pixel points of the specified anchor.

See Also

createAnchor

Reimplemented from QCPAbstractItem.

QPen QCPItemEllipse::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.

QBrush QCPItemEllipse::mainBrush ( ) const

protected

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.

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

• src/items/item-ellipse.h
• src/items/item-ellipse.cpp