Qwt User's Guide: QwtPlotPicker Class Reference

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QwtPlotPicker Class Reference

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

#include <qwt_plot_picker.h>

Inheritance diagram for QwtPlotPicker:
[legend]

List of all members.

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.

Generated on Wed Sep 2 18:37:26 2009 for Qwt User's Guide by  doxygen 1.6.1
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