A straight line that spans infinitely in both directions. More...

Inheritance diagram for QCPItemStraightLine:

Public Functions
	QCPItemStraightLine (QCustomPlot *parentPlot)

QPen	pen () const

QPen	selectedPen () const

void	setPen (const QPen &pen)

void	setSelectedPen (const QPen &pen)

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	point1

QCPItemPosition *const	point2

Protected Functions
virtual void	draw (QCPPainter *painter)

double	distToStraightLine (const QVector2D &point1, const QVector2D &vec, const QVector2D &point) const

QLineF	getRectClippedStraightLine (const QVector2D &point1, const QVector2D &vec, const QRect &rect) const

QPen	mainPen () 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)

virtual QPointF	anchorPixelPoint (int anchorId) const

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

A straight line that spans infinitely in both directions.

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

It has two positions, point1 and point2, which define the straight line.

Constructor & Destructor Documentation

QCPItemStraightLine::QCPItemStraightLine ( QCustomPlot * parentPlot )

Creates a straight line item and sets default values.

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

Member Function Documentation

void QCPItemStraightLine::setPen ( const QPen & pen )

Sets the pen that will be used to draw the line

See Also: setSelectedPen

void QCPItemStraightLine::setSelectedPen ( const QPen & pen )

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

See Also: setPen, setSelected

double QCPItemStraightLine::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 QCPItemStraightLine::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.

double QCPItemStraightLine::distToStraightLine	(	const QVector2D &	base,
		const QVector2D &	vec,
		const QVector2D &	point
	)		const

protected

finds the shortest distance of point to the straight line defined by the base point base and the direction vector vec.

This is a helper function for selectTest.

QLineF QCPItemStraightLine::getRectClippedStraightLine	(	const QVector2D &	base,
		const QVector2D &	vec,
		const QRect &	rect
	)		const

protected

Returns the section of the straight line defined by base and direction vector vec, that is visible in the specified rect.

This is a helper function for draw.

QPen QCPItemStraightLine::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.

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

src/items/item-straightline.h
src/items/item-straightline.cpp

Public Functions

Public Members

Protected Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation