Qwt User's Guide 6.1.0

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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]

## 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)
Signals inherited from QwtPicker
void | activated (bool on)
void | selected (const QPolygon &polygon)
void | appended (const QPoint &pos)
void | moved (const QPoint &pos)
void | removed (const QPoint &pos)
void | changed (const QPolygon &selection)

## Public Member Functions
| QwtPlotPicker (QWidget *canvas)
| Create a plot picker. More...
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
Public Member Functions inherited from QwtPicker
| QwtPicker (QWidget *parent)
| QwtPicker (RubberBand rubberBand, DisplayMode trackerMode, QWidget *)
virtual | ~QwtPicker ()
| Destructor.
void | setStateMachine (QwtPickerMachine *)
const QwtPickerMachine * | stateMachine () const
QwtPickerMachine * | stateMachine ()
void | setRubberBand (RubberBand)
RubberBand | rubberBand () const
void | setTrackerMode (DisplayMode)
| Set the display mode of the tracker. More...
DisplayMode | trackerMode () const
void | setResizeMode (ResizeMode)
| Set the resize mode. More...
ResizeMode | resizeMode () const
void | setRubberBandPen (const QPen &)
QPen | rubberBandPen () const
void | setTrackerPen (const QPen &)
QPen | trackerPen () const
void | setTrackerFont (const QFont &)
QFont | trackerFont () const
bool | isEnabled () const
bool | isActive () const
virtual bool | eventFilter (QObject *, QEvent *)
| Event filter. More...
QWidget * | parentWidget ()
| Return the parent widget, where the selection happens.
const QWidget * | parentWidget () const
| Return the parent widget, where the selection happens.
virtual QPainterPath | pickArea () const
virtual void | drawRubberBand (QPainter *) const
virtual void | drawTracker (QPainter *) const
virtual QRegion | rubberBandMask () const
QPoint | trackerPosition () const
virtual QRect | trackerRect (const QFont &) const
QPolygon | selection () const
Public Member Functions inherited from QwtEventPattern
| QwtEventPattern ()
virtual | ~QwtEventPattern ()
| Destructor.
void | initMousePattern (int numButtons)
void | initKeyPattern ()
void | setMousePattern (MousePatternCode, Qt::MouseButton button, Qt::KeyboardModifiers=Qt::NoModifier)
void | setKeyPattern (KeyPatternCode, int keyCode, Qt::KeyboardModifiers modifierCodes=Qt::NoModifier)
void | setMousePattern (const QVector< MousePattern > &)
| Change the mouse event patterns.
void | setKeyPattern (const QVector< KeyPattern > &)
| Change the key event patterns.
const QVector< MousePattern > & | mousePattern () const
const QVector< KeyPattern > & | keyPattern () const
QVector< MousePattern > & | mousePattern ()
QVector< KeyPattern > & | keyPattern ()
bool | mouseMatch (MousePatternCode, const QMouseEvent *) const
| Compare a mouse event with an event pattern. More...
bool | keyMatch (KeyPatternCode, const QKeyEvent *) const
| Compare a key event with an event pattern. More...

## 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. More...
virtual void | move (const QPoint &)
virtual void | append (const QPoint &)
virtual bool | end (bool ok=true)
Protected Member Functions inherited from QwtPicker
virtual QPolygon | adjustedPoints (const QPolygon &) const
| Map the pickedPoints() into a selection() More...
virtual void | transition (const QEvent *)
virtual void | begin ()
virtual void | remove ()
virtual bool | accept (QPolygon &) const
| Validate and fix up the selection. More...
virtual void | reset ()
virtual void | widgetMousePressEvent (QMouseEvent *)
virtual void | widgetMouseReleaseEvent (QMouseEvent *)
virtual void | widgetMouseDoubleClickEvent (QMouseEvent *)
virtual void | widgetMouseMoveEvent (QMouseEvent *)
virtual void | widgetWheelEvent (QWheelEvent *)
virtual void | widgetKeyPressEvent (QKeyEvent *)
virtual void | widgetKeyReleaseEvent (QKeyEvent *)
virtual void | widgetEnterEvent (QEvent *)
virtual void | widgetLeaveEvent (QEvent *)
virtual void | stretchSelection (const QSize &oldSize, const QSize &newSize)
virtual void | updateDisplay ()
| Update the state of rubber band and tracker label.
const QwtWidgetOverlay * | rubberBandOverlay () const
const QwtWidgetOverlay * | trackerOverlay () const
const QPolygon & | pickedPoints () const
Protected Member Functions inherited from QwtEventPattern
virtual bool | mouseMatch (const MousePattern &, const QMouseEvent *) const
| Compare a mouse event with an event pattern. More...
virtual bool | keyMatch (const KeyPattern &, const QKeyEvent *) const
| Compare a key event with an event pattern. More...

## Additional Inherited Members
Public Types inherited from QwtPicker
enum | RubberBand { NoRubberBand = 0, HLineRubberBand, VLineRubberBand, CrossRubberBand, RectRubberBand, EllipseRubberBand, PolygonRubberBand, UserRubberBand = 100 }
enum | DisplayMode { AlwaysOff, AlwaysOn, ActiveOnly }
| Display mode. More...
enum | ResizeMode { Stretch, KeepSize }
Public Slots inherited from QwtPicker
void | setEnabled (bool)
| En/disable the picker. More...

## 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 | ( | int | xAxis,
|  | int | yAxis,
|  | 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 | ( | int | xAxis,
|  | int | yAxis,
|  | RubberBand | rubberBand,
|  | DisplayMode | trackerMode,
|  | 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 | ( | 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 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 | ( | 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 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()