Linux Certif

Toute la documentation sur la certification Linux LPI

QwtPlotPicker

NAME

QwtPlotPicker -

QwtPlotPicker provides selections on a plot canvas.

SYNOPSIS

#include <qwt_plot_picker.h>

Inherits QwtPicker.

Inherited by QwtPlotZoomer.

Signals

void selected (const QwtDoublePoint &pos)

void selected (const QwtDoubleRect &rect)

void selected (const QwtArray< QwtDoublePoint > &pa)

void appended (const QwtDoublePoint &pos)

void moved (const QwtDoublePoint &pos)

Public Member Functions

QwtPlotPicker (QwtPlotCanvas *)

virtual ~QwtPlotPicker ()

QwtPlotPicker (int xAxis, int yAxis, QwtPlotCanvas *)

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

virtual void setAxis (int xAxis, int yAxis)

int xAxis () const

int yAxis () const

QwtPlot * plot ()

const QwtPlot * plot () const

QwtPlotCanvas * canvas ()

const QwtPlotCanvas * canvas () const

Protected Member Functions

QwtDoubleRect scaleRect () const

QwtDoubleRect invTransform (const QRect &) const

QRect transform (const QwtDoubleRect &) const

QwtDoublePoint invTransform (const QPoint &) const

QPoint transform (const QwtDoublePoint &) const

virtual QwtText trackerText (const QPoint &) const

virtual QwtText trackerText (const QwtDoublePoint &) const

virtual void move (const QPoint &)

virtual void append (const QPoint &)

virtual bool end (bool ok=true)

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 coodinate system.

Constructor & Destructor Documentation

QwtPlotPicker::QwtPlotPicker (QwtPlotCanvas * 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(), QwtPlotPicker::scaleRect()

QwtPlotPicker::~QwtPlotPicker () [virtual]

Destructor.

QwtPlotPicker::QwtPlotPicker (int xAxis, int yAxis, QwtPlotCanvas * 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(), QwtPlotPicker::scaleRect()

QwtPlotPicker::QwtPlotPicker (int xAxis, int yAxis, int selectionFlags, RubberBand rubberBand, DisplayMode trackerMode, QwtPlotCanvas * canvas) [explicit]Create a plot picker

Parameters:

xAxis X axis of the picker
yAxis Y axis of the picker
selectionFlags Or'd value of SelectionType, RectSelectionType and SelectionMode
rubberBand Rubberband 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(), QwtPlotPicker::scaleRect()

Member Function Documentation

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

Reimplemented from QwtPicker.

void QwtPlotPicker::appended (const QwtDoublePoint & 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()

const QwtPlotCanvas * QwtPlotPicker::canvas () const

Return Observed plot canvas.

QwtPlotCanvas * QwtPlotPicker::canvas ()

Return observed plot canvas.

bool QwtPlotPicker::end (bool ok = 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 is accepted, false otherwise

Reimplemented from QwtPicker.

Reimplemented in QwtPlotZoomer.

QwtDoublePoint QwtPlotPicker::invTransform (const QPoint & pos) const [protected]Translate a point from pixel into plot coordinates

Returns:

Point in plot coordinates

See also:

QwtPlotPicker::transform()

QwtDoubleRect QwtPlotPicker::invTransform (const QRect & rect) const [protected]Translate a rectangle from pixel into plot coordinates

Returns:

Rectangle in plot coordinates

See also:

QwtPlotPicker::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 QwtDoublePoint & 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()

const QwtPlot * QwtPlotPicker::plot () const

Return plot widget, containing the observed plot canvas.

QwtPlot * QwtPlotPicker::plot ()

Return plot widget, containing the observed plot canvas.

QwtDoubleRect QwtPlotPicker::scaleRect () const [protected]Return normalized bounding rect of the axes

See also:

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

void QwtPlotPicker::selected (const QwtArray< QwtDoublePoint > & pa) [signal]A signal emitting the selected points, at the end of a selection.

Parameters:

pa Selected points

void QwtPlotPicker::selected (const QwtDoubleRect & rect) [signal]A signal emitted in case of selectionFlags() & RectSelection.

Parameters:

rect Selected rectangle

void QwtPlotPicker::selected (const QwtDoublePoint & pos) [signal]A signal emitted in case of selectionFlags() & PointSelection.

Parameters:

pos Selected point

void QwtPlotPicker::setAxis (int xAxis, int yAxis) [virtual]Set the x and y axes of the picker

Parameters:

xAxis X axis
yAxis Y axis

Reimplemented in QwtPlotZoomer.

QwtText QwtPlotPicker::trackerText (const QwtDoublePoint & 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

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.

QPoint QwtPlotPicker::transform (const QwtDoublePoint & pos) const [protected]Translate a point from plot into pixel coordinates

Returns:

Point in pixel coordinates

See also:

QwtPlotPicker::invTransform()

QRect QwtPlotPicker::transform (const QwtDoubleRect & rect) const [protected]Translate a rectangle from plot into pixel coordinates

Returns:

Rectangle in pixel coordinates

See also:

QwtPlotPicker::invTransform()

int QwtPlotPicker::xAxis () const

Return x axis.

int QwtPlotPicker::yAxis () const

Return y axis.

Author

Generated automatically by Doxygen for Qwt User's Guide from the source code.