QwtPlotPicker (3) - Linux Manuals

NAME

QwtPlotPicker -

QwtPlotPicker provides selections on a plot canvas.

SYNOPSIS

#include <qwt_plot_picker.h>

Inherits QwtPicker.

Inherited by QwtPlotZoomer.

Signals

void selected (const QPointF &pos)

void selected (const QRectF &rect)

void selected (const QVector< QPointF > &pa)

void appended (const QPointF &pos)

void moved (const QPointF &pos)

Public Member Functions

QwtPlotPicker (QWidget *canvas)
Create a plot picker.
virtual ~QwtPlotPicker ()
Destructor.
QwtPlotPicker (int xAxis, int yAxis, QWidget *)

QwtPlotPicker (int xAxis, int yAxis, RubberBand rubberBand, DisplayMode trackerMode, QWidget *)

virtual void setAxis (int xAxis, int yAxis)

int xAxis () const
Return x axis.
int yAxis () const
Return y axis.
QwtPlot * plot ()

const QwtPlot * plot () const

QWidget * canvas ()

const QWidget * canvas () const

Protected Member Functions

QRectF scaleRect () const

QRectF invTransform (const QRect &) const

QRect transform (const QRectF &) const

QPointF invTransform (const QPoint &) const

QPoint transform (const QPointF &) const

virtual QwtText trackerText (const QPoint &) const

virtual QwtText trackerTextF (const QPointF &) const
Translate a position into a position string.
virtual void move (const QPoint &)

virtual void append (const QPoint &)

virtual bool end (bool ok=true)

Additional Inherited Members

Detailed Description

QwtPlotPicker provides selections on a plot canvas.

QwtPlotPicker is a QwtPicker tailored for selections on a plot canvas. It is set to a x-Axis and y-Axis and translates all pixel coordinates into this coordinate system.

Constructor & Destructor Documentation

QwtPlotPicker::QwtPlotPicker (QWidget *canvas) [explicit]

Create a plot picker. The picker is set to those x- and y-axis of the plot that are enabled. If both or no x-axis are enabled, the picker is set to QwtPlot::xBottom. If both or no y-axis are enabled, it is set to QwtPlot::yLeft.

Parameters:

canvas Plot canvas to observe, also the parent object

See Also:

QwtPlot::autoReplot(), QwtPlot::replot(), scaleRect()

QwtPlotPicker::QwtPlotPicker (intxAxis, intyAxis, QWidget *canvas) [explicit]

Create a plot picker

Parameters:

xAxis Set the x axis of the picker
yAxis Set the y axis of the picker
canvas Plot canvas to observe, also the parent object

See Also:

QwtPlot::autoReplot(), QwtPlot::replot(), scaleRect()

QwtPlotPicker::QwtPlotPicker (intxAxis, intyAxis, RubberBandrubberBand, DisplayModetrackerMode, QWidget *canvas) [explicit]

Create a plot picker

Parameters:

xAxis X axis of the picker
yAxis Y axis of the picker
rubberBand Rubber band style
trackerMode Tracker mode
canvas Plot canvas to observe, also the parent object

See Also:

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

QwtPlot::autoReplot(), QwtPlot::replot(), scaleRect()

Member Function Documentation

void QwtPlotPicker::append (const QPoint &pos) [protected], [virtual]

Append a point to the selection and update rubber band and tracker.

Parameters:

pos Additional point

See Also:

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

Note:

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

Reimplemented from QwtPicker.

void QwtPlotPicker::appended (const QPointF &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()

QWidget * QwtPlotPicker::canvas ()

Returns:

Observed plot canvas

const QWidget * QwtPlotPicker::canvas () const

Returns:

Observed plot canvas

bool QwtPlotPicker::end (boolok = true) [protected], [virtual]

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 has been accepted, false otherwise

Reimplemented from QwtPicker.

Reimplemented in QwtPlotZoomer.

QRectF QwtPlotPicker::invTransform (const QRect &rect) const [protected]

Translate a rectangle from pixel into plot coordinates

Returns:

Rectangle in plot coordinates

See Also:

transform()

QPointF QwtPlotPicker::invTransform (const QPoint &pos) const [protected]

Translate a point from pixel into plot coordinates

Returns:

Point in plot coordinates

See Also:

transform()

void QwtPlotPicker::move (const QPoint &pos) [protected], [virtual]

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.

Reimplemented from QwtPicker.

void QwtPlotPicker::moved (const QPointF &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()

QwtPlot * QwtPlotPicker::plot ()

Returns:

Plot widget, containing the observed plot canvas

const QwtPlot * QwtPlotPicker::plot () const

Returns:

Plot widget, containing the observed plot canvas

QRectF QwtPlotPicker::scaleRect () const [protected]

Returns:

Normalized bounding rectangle of the axes

See Also:

QwtPlot::autoReplot(), QwtPlot::replot().

void QwtPlotPicker::selected (const QPointF &pos) [signal]

A signal emitted in case of QwtPickerMachine::PointSelection.

Parameters:

pos Selected point

void QwtPlotPicker::selected (const QRectF &rect) [signal]

A signal emitted in case of QwtPickerMachine::RectSelection.

Parameters:

rect Selected rectangle

void QwtPlotPicker::selected (const QVector< QPointF > &pa) [signal]

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

Parameters:

pa Selected points

void QwtPlotPicker::setAxis (intxAxis, intyAxis) [virtual]

Set the x and y axes of the picker

Parameters:

xAxis X axis
yAxis Y axis

Reimplemented in QwtPlotZoomer.

QwtText QwtPlotPicker::trackerText (const QPoint &pos) const [protected], [virtual]

Translate a pixel position into a position string

Parameters:

pos Position in pixel coordinates

Returns:

Position string

Reimplemented from QwtPicker.

QwtText QwtPlotPicker::trackerTextF (const QPointF &pos) const [protected], [virtual]

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

QRect QwtPlotPicker::transform (const QRectF &rect) const [protected]

Translate a rectangle from plot into pixel coordinates

Returns:

Rectangle in pixel coordinates

See Also:

invTransform()

QPoint QwtPlotPicker::transform (const QPointF &pos) const [protected]

Translate a point from plot into pixel coordinates

Returns:

Point in pixel coordinates

See Also:

invTransform()

Author

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