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QwtPlotPicker Class Reference

Inheritance diagram for QwtPlotPicker:

QwtPicker QwtEventPattern QwtPlotZoomer List of all 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 coodinate system.


Public Member Functions

 QwtPlotPicker (QwtPlotCanvas *, const char *name=0)
 QwtPlotPicker (int xAxis, int yAxis, QwtPlotCanvas *, const char *name=0)
 QwtPlotPicker (int xAxis, int yAxis, int selectionFlags, RubberBand rubberBand, DisplayMode cursorLabelMode, QwtPlotCanvas *, const char *name=0)
virtual void setAxis (int xAxis, int yAxis)
int xAxis () const
int yAxis () const
QwtPlotplot ()
const QwtPlotplot () const
QwtPlotCanvascanvas ()
const QwtPlotCanvascanvas () const

Protected Member Functions

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)
QwtDoubleRect scaleRect () const
QwtDoubleRect invTransform (const QRect &) const
QRect transform (const QwtDoubleRect &) const
QwtDoublePoint invTransform (const QPoint &) const
QPoint transform (const QwtDoublePoint &) const
virtual QString cursorLabel (const QPoint &) const
virtual QString cursorLabel (const QwtDoublePoint &) const
virtual void move (const QPoint &)
virtual void append (const QPoint &)
virtual bool end (bool ok=TRUE)


Constructor & Destructor Documentation

QwtPlotPicker::QwtPlotPicker QwtPlotCanvas canvas,
const char *  name = 0
 

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
name Object name

QwtPlotPicker::QwtPlotPicker int  xAxis,
int  yAxis,
QwtPlotCanvas canvas,
const char *  name = 0
 

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
name Object name

QwtPlotPicker::QwtPlotPicker int  xAxis,
int  yAxis,
int  selectionFlags,
RubberBand  rubberBand,
DisplayMode  cursorLabelMode,
QwtPlotCanvas canvas,
const char *  name = 0
 

Create a plot picker

Parameters:
xAxis X axis of the picker
yAxis Y axis of the picker
selectionFlags Orīd value of SelectionType, RectSelectionType and SelectionMode
rubberBand Rubberband style
cursorLabelMode Cursor label mode
canvas Plot canvas to observe, also the parent object
name Object name
See also:
QwtPicker, QwtPicker::setSelectionFlags(), QwtPicker::setRubberBand(), QwtPicker::setCursorLabelMode


Member Function Documentation

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

Append a point to the selection and update rubberband and cursor label.

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  )  [protected]
 

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.

QString QwtPlotPicker::cursorLabel 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 ī, ī.

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

Parameters:
pos Position
Returns:
Position string

QString QwtPlotPicker::cursorLabel 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.

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  )  [protected]
 

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.

void QwtPlotPicker::selected const QwtArray< QwtDoublePoint > &  pa  )  [protected]
 

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

Parameters:
pa Selected points

void QwtPlotPicker::selected const QwtDoubleRect rect  )  [protected]
 

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

Parameters:
rect Selected rectangle

void QwtPlotPicker::selected const QwtDoublePoint pos  )  [protected]
 

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.

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 Tue Nov 4 09:53:52 2003 for Qwt User's Guide by doxygen 1.3.4