QwtPlotPicker - QwtPlotPicker provides selections on a plot canvas.

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)

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.
virtual ˜QwtPlotPicker ()
Destructor.
QwtPlotPicker (QwtAxisId xAxisId, QwtAxisId yAxisId, QWidget *)
QwtPlotPicker (QwtAxisId xAxisId, QwtAxisId yAxisId, RubberBand rubberBand, DisplayMode trackerMode, QWidget *)
virtual void setAxes (QwtAxisId xAxisId, QwtAxisId yAxisId)
QwtAxisId xAxis () const
Return x axis.
QwtAxisId 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.
DisplayMode trackerMode () const
void setResizeMode (ResizeMode)
Set the resize mode.
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 *) override
Event filter.
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 trackerMask () 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 key, Qt::KeyboardModifiers modifiers=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.
bool keyMatch (KeyPatternCode, const QKeyEvent *) const
Compare a key event with an event pattern.

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 override
virtual QwtText trackerTextF (const QPointF &) const
Translate a position into a position string.
virtual void move (const QPoint &) override
virtual void append (const QPoint &) override
virtual bool end (bool ok=true) override

Protected Member Functions inherited from QwtPicker

virtual QPolygon adjustedPoints (const QPolygon &) const
Map the pickedPoints() into a selection()
virtual void transition (const QEvent *)
virtual void begin ()
virtual void remove ()
virtual bool accept (QPolygon &) const
Validate and fix up the selection.
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
QRect trackerRect (const QSize &) const

Protected Member Functions inherited from QwtEventPattern

virtual bool mouseMatch (const MousePattern &, const QMouseEvent *) const
Compare a mouse event with an event pattern.
virtual bool keyMatch (const KeyPattern &, const QKeyEvent *) const
Compare a key event with an event pattern.

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.
enum ResizeMode { Stretch, KeepSize }

Public Types inherited from QwtEventPattern

enum MousePatternCode { MouseSelect1, MouseSelect2, MouseSelect3, MouseSelect4, MouseSelect5, MouseSelect6, MousePatternCount }
Symbolic mouse input codes.
enum KeyPatternCode { KeySelect1, KeySelect2, KeyAbort, KeyLeft, KeyRight, KeyUp, KeyDown, KeyRedo, KeyUndo, KeyHome, KeyPatternCount }
Symbolic keyboard input codes.

Public Slots inherited from QwtPicker

void setEnabled (bool)
En/disable the picker.

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.

Definition at line 33 of file qwt_plot_picker.h.

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 QwtAxis::XBottom. If both or no y-axis are enabled, it is set to QwtAxis::YLeft.

Parameters

canvas Plot canvas to observe, also the parent object

See also

QwtPlot::autoReplot(), QwtPlot::replot(), scaleRect()

Definition at line 43 of file qwt_plot_picker.cpp.

QwtPlotPicker::˜QwtPlotPicker () [virtual]

Destructor.

Definition at line 108 of file qwt_plot_picker.cpp.

QwtPlotPicker::QwtPlotPicker (QwtAxisId xAxisId, QwtAxisId yAxisId, QWidget* canvas) [explicit]

Create a plot picker

Parameters

xAxisId X axis of the picker
yAxisId Y axis of the picker
canvas Plot canvas to observe, also the parent object

See also

QwtPlot::autoReplot(), QwtPlot::replot(), scaleRect()

Definition at line 76 of file qwt_plot_picker.cpp.

QwtPlotPicker::QwtPlotPicker (QwtAxisId xAxisId, QwtAxisId yAxisId,RubberBand rubberBand, DisplayMode trackerMode, QWidget * canvas)[explicit]

Create a plot picker

Parameters

xAxisId X axis of the picker
yAxisId 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()

Definition at line 98 of file qwt_plot_picker.cpp.

Member Function Documentation

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

Definition at line 251 of file qwt_plot_picker.cpp.

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

Definition at line 114 of file qwt_plot_picker.cpp.

const QWidget * QwtPlotPicker::canvas () const

Returns

Observed plot canvas

Definition at line 120 of file qwt_plot_picker.cpp.

bool QwtPlotPicker::end (bool ok = true) [override], [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.

Definition at line 280 of file qwt_plot_picker.cpp.

QPointF QwtPlotPicker::invTransform (const QPoint & pos) const [protected]

Translate a point from pixel into plot coordinates

Returns

Point in plot coordinates

See also

transform()

Definition at line 367 of file qwt_plot_picker.cpp.

QRectF QwtPlotPicker::invTransform (const QRect & rect) const [protected]

Translate a rectangle from pixel into plot coordinates

Returns

Rectangle in plot coordinates

See also

transform()

Definition at line 341 of file qwt_plot_picker.cpp.

void QwtPlotPicker::move (const QPoint & pos) [override], [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.

Definition at line 266 of file qwt_plot_picker.cpp.

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

Definition at line 126 of file qwt_plot_picker.cpp.

const QwtPlot * QwtPlotPicker::plot () const

Returns

Plot widget, containing the observed plot canvas

Definition at line 136 of file qwt_plot_picker.cpp.

QRectF QwtPlotPicker::scaleRect () const [protected]

Returns

Normalized bounding rectangle of the axes

See also

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

Definition at line 149 of file qwt_plot_picker.cpp.

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::setAxes (QwtAxisId xAxisId, QwtAxisId yAxisId)[virtual]

Set the x and y axes of the picker

Parameters

xAxisId X axis
yAxisId Y axis

Reimplemented in QwtPlotZoomer.

Definition at line 172 of file qwt_plot_picker.cpp.

QwtText QwtPlotPicker::trackerText (const QPoint & pos) const [override],[protected], [virtual]

Translate a pixel position into a position string

Parameters

pos Position in pixel coordinates

Returns

Position string

Reimplemented from QwtPicker.

Definition at line 203 of file qwt_plot_picker.cpp.

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

Definition at line 223 of file qwt_plot_picker.cpp.

QPoint QwtPlotPicker::transform (const QPointF & pos) const [protected]

Translate a point from plot into pixel coordinates

Returns

Point in pixel coordinates

See also

invTransform()

Definition at line 383 of file qwt_plot_picker.cpp.

QRect QwtPlotPicker::transform (const QRectF & rect) const [protected]

Translate a rectangle from plot into pixel coordinates

Returns

Rectangle in pixel coordinates

See also

invTransform()

Definition at line 354 of file qwt_plot_picker.cpp.

QwtAxisId QwtPlotPicker::xAxis () const

Return x axis.

Definition at line 186 of file qwt_plot_picker.cpp.

QwtAxisId QwtPlotPicker::yAxis () const

Return y axis.

Definition at line 192 of file qwt_plot_picker.cpp.

Author

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Updated 2026-06-01 - jenkler.se | uex.se