Provided by: libqwt-doc_6.0.0-1.2_all 
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 (QwtPlotCanvas *)
virtual ~QwtPlotPicker ()
QwtPlotPicker (int xAxis, int yAxis, QwtPlotCanvas *)
QwtPlotPicker (int xAxis, int yAxis, 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
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
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(), scaleRect()
QwtPlotPicker::~QwtPlotPicker () [virtual]
Destructor.
QwtPlotPicker::QwtPlotPicker (intxAxis, intyAxis, 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(), scaleRect()
QwtPlotPicker::QwtPlotPicker (intxAxis, intyAxis, RubberBandrubberBand, DisplayModetrackerMode, QwtPlotCanvas
*canvas) [explicit] Create a plot picker
Parameters:
xAxis X axis of the picker
yAxis Y axis of the picker
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(), 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 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()
QwtPlotCanvas * QwtPlotPicker::canvas ()
Return observed plot canvas.
const QwtPlotCanvas * QwtPlotPicker::canvas () const
Return 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 is accepted, false otherwise
Reimplemented from QwtPicker.
Reimplemented in QwtPlotZoomer.
QPointF QwtPlotPicker::invTransform (const QPoint &pos) const [protected] Translate a point from pixel into
plot coordinates
Returns:
Point in plot coordinates
See also:
transform()
QRectF QwtPlotPicker::invTransform (const QRect &rect) const [protected] Translate a rectangle from pixel
into plot coordinates
Returns:
Rectangle 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()
const QwtPlot * QwtPlotPicker::plot () const
Return plot widget, containing the observed plot canvas.
QwtPlot * QwtPlotPicker::plot ()
Return plot widget, containing the observed plot canvas.
QRectF QwtPlotPicker::scaleRect () const [protected] Return normalized bounding rect of the axes
See also:
QwtPlot::autoReplot(), QwtPlot::replot().
void QwtPlotPicker::selected (const QPointF &pos) [signal] A signal emitted in case of selectionFlags() &
PointSelection.
Parameters:
pos Selected point
void QwtPlotPicker::selected (const QRectF &rect) [signal] A signal emitted in case of selectionFlags() &
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()
int QwtPlotPicker::xAxis () const
Return x axis.
int QwtPlotPicker::yAxis () const
Return y axis.
Author
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