QwtPolarPicker Class Reference

QwtPolarPicker provides selections on a plot canvas. More...

#include <qwt_polar_picker.h>

Inheritance diagram for QwtPolarPicker:

Signals
void	selected (const QwtPointPolar &pos)
void	selected (const QVector< QwtPointPolar > &points)
void	appended (const QwtPointPolar &pos)
void	moved (const QwtPointPolar &pos)

Public Member Functions
	QwtPolarPicker (QwtPolarCanvas *)
	Create a polar plot picker. More...
virtual	~QwtPolarPicker ()
	Destructor.
	QwtPolarPicker (RubberBand rubberBand, DisplayMode trackerMode, QwtPolarCanvas *)
QwtPolarPlot *	plot ()
const QwtPolarPlot *	plot () const
QwtPolarCanvas *	canvas ()
const QwtPolarCanvas *	canvas () const
virtual QRect	pickRect () const

Protected Member Functions
QwtPointPolar	invTransform (const QPoint &) const
virtual QwtText	trackerText (const QPoint &) const
virtual QwtText	trackerTextPolar (const QwtPointPolar &) const
	Translate a position into a position string. More...
virtual void	move (const QPoint &)
virtual void	append (const QPoint &)
virtual bool	end (bool ok=true)

Detailed Description

QwtPolarPicker provides selections on a plot canvas.

QwtPolarPicker is a QwtPicker tailored for selections on a polar plot canvas.

Constructor & Destructor Documentation

QwtPolarPicker::QwtPolarPicker ( QwtPolarCanvas *  canvas )

explicit

Create a polar plot picker.

Parameters

canvas

Plot canvas to observe, also the parent object

QwtPolarPicker::QwtPolarPicker ( RubberBand  rubberBand, DisplayMode  trackerMode, QwtPolarCanvas *  canvas  )

explicit

Create a plot picker

Parameters

rubberBand	Rubberband style
trackerMode	Tracker mode
canvas	Plot canvas to observe, also the parent object

See Also

QwtPicker, QwtPicker::setSelectionFlags(), QwtPicker::setRubberBand(), QwtPicker::setTrackerMode

QwtPolarPlot::autoReplot(), QwtPolarPlot::replot(), scaleRect()

Member Function Documentation

void QwtPolarPicker::append ( const QPoint &  pos )

protectedvirtual

Append a point to the selection and update rubberband and tracker.

Parameters

pos	Additional point

See Also

isActive, begin(), end(), move(), appended()

Note

The appended(const QPoint &), appended(const QDoublePoint &) signals are emitted.

void QwtPolarPicker::appended ( const QwtPointPolar &  pos )

signal

A signal emitted when a point has been appended to the selection

Parameters

pos	Position of the appended point.

See Also

append(). moved()

QwtPolarCanvas * QwtPolarPicker::canvas

(

)

Returns

Observed plot canvas

const QwtPolarCanvas * QwtPolarPicker::canvas

(

)

const

Returns

Observed plot canvas

bool QwtPolarPicker::end ( bool  ok = true )

protectedvirtual

Close a selection setting the state to inactive.

Parameters

ok	If true, complete the selection and emit selected signals otherwise discard the selection.

Returns

true if the selection is accepted, false otherwise

QwtPointPolar QwtPolarPicker::invTransform ( const QPoint &  pos ) const

protected

Translate a point from widget into plot coordinates

Parameters

pos	Point in widget coordinates of the plot canvas

Returns

Point in plot coordinates

See Also

transform(), canvas()

void QwtPolarPicker::move ( const QPoint &  pos )

protectedvirtual

Move the last point of the selection

Parameters

pos	New position

See Also

isActive, begin(), end(), append()

Note

The moved(const QPoint &), moved(const QDoublePoint &) signals are emitted.

void QwtPolarPicker::moved ( const QwtPointPolar &  pos )

signal

A signal emitted whenever the last appended point of the selection has been moved.

Parameters

pos	Position of the moved last point of the selection.

See Also

move(), appended()

QRect QwtPolarPicker::pickRect ( ) const

virtual

Returns

Bounding rectangle of the region, where picking is supported.

QwtPolarPlot * QwtPolarPicker::plot

(

)

Returns

Plot widget, containing the observed plot canvas

const QwtPolarPlot * QwtPolarPicker::plot

(

)

const

Returns

Plot widget, containing the observed plot canvas

void QwtPolarPicker::selected ( const QwtPointPolar &  pos )

signal

A signal emitted in case of selectionFlags() & PointSelection.

Parameters

pos	Selected point

void QwtPolarPicker::selected ( const QVector< QwtPointPolar > &  points )

signal

A signal emitting the selected points, at the end of a selection.

Parameters

points

Selected points

QwtText QwtPolarPicker::trackerText ( const QPoint &  pos ) const

protectedvirtual

Translate a pixel position into a position string

Parameters

pos	Position in pixel coordinates

Returns

Position string

QwtText QwtPolarPicker::trackerTextPolar ( const QwtPointPolar &  pos ) const

protectedvirtual

Translate a position into a position string.

In case of HLineRubberBand the label is the value of the y position, in case of VLineRubberBand the value of the x position. Otherwise the label contains x and y position separated by a ',' .

The format for the double to string conversion is "%.4f".

Parameters

pos

Position

Returns

Position string