QwtPlotPicker Class Reference

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

#include <qwt_plot_picker.h>

Inheritance diagram for QwtPlotPicker:

Inheritance graph
[legend]

List of all members.

Public Types

enum  DisplayMode {
  AlwaysOff,
  AlwaysOn,
  ActiveOnly
}
enum  KeyPatternCode {
  KeySelect1,
  KeySelect2,
  KeyAbort,
  KeyLeft,
  KeyRight,
  KeyUp,
  KeyDown,
  KeyRedo,
  KeyUndo,
  KeyHome,
  KeyPatternCount
}
enum  MousePatternCode {
  MouseSelect1,
  MouseSelect2,
  MouseSelect3,
  MouseSelect4,
  MouseSelect5,
  MouseSelect6,
  MousePatternCount
}
enum  ResizeMode {
  Stretch,
  KeepSize
}
enum  RubberBand {
  NoRubberBand = 0,
  HLineRubberBand,
  VLineRubberBand,
  CrossRubberBand,
  RectRubberBand,
  EllipseRubberBand,
  PolygonRubberBand,
  UserRubberBand = 100
}

Public Slots

void setEnabled (bool)

Signals

void activated (bool on)
void appended (const QPoint &pos)
void appended (const QPointF &pos)
void changed (const QPolygon &selection)
void moved (const QPoint &pos)
void moved (const QPointF &pos)
void removed (const QPoint &pos)
void selected (const QPolygon &polygon)
void selected (const QVector< QPointF > &pa)
void selected (const QRectF &rect)
void selected (const QPointF &pos)

Public Member Functions

const QwtPlotCanvascanvas () const
QwtPlotCanvascanvas ()
virtual void drawRubberBand (QPainter *) const
virtual void drawTracker (QPainter *) const
virtual bool eventFilter (QObject *, QEvent *)
void initKeyPattern ()
void initMousePattern (int numButtons)
bool isActive () const
bool isEnabled () const
bool keyMatch (uint pattern, const QKeyEvent *) const
QVector< KeyPattern > & keyPattern ()
const QVector< KeyPattern > & keyPattern () const
bool mouseMatch (uint pattern, const QMouseEvent *) const
QVector< MousePattern > & mousePattern ()
const QVector< MousePattern > & mousePattern () const
const QWidget * parentWidget () const
QWidget * parentWidget ()
virtual QRect pickRect () const
const QwtPlotplot () const
QwtPlotplot ()
 QwtPlotPicker (int xAxis, int yAxis, RubberBand rubberBand, DisplayMode trackerMode, QwtPlotCanvas *)
 QwtPlotPicker (int xAxis, int yAxis, QwtPlotCanvas *)
 QwtPlotPicker (QwtPlotCanvas *)
ResizeMode resizeMode () const
RubberBand rubberBand () const
QPen rubberBandPen () const
QPolygon selection () const
virtual void setAxis (int xAxis, int yAxis)
void setKeyPattern (const QVector< KeyPattern > &)
void setKeyPattern (uint pattern, int key, int state=Qt::NoButton)
void setMousePattern (const QVector< MousePattern > &)
void setMousePattern (uint pattern, int button, int state=Qt::NoButton)
void setResizeMode (ResizeMode)
void setRubberBand (RubberBand)
void setRubberBandPen (const QPen &)
void setStateMachine (QwtPickerMachine *)
void setTrackerFont (const QFont &)
void setTrackerMode (DisplayMode)
void setTrackerPen (const QPen &)
QwtPickerMachinestateMachine ()
const QwtPickerMachinestateMachine () const
QFont trackerFont () const
DisplayMode trackerMode () const
QPen trackerPen () const
QPoint trackerPosition () const
virtual QRect trackerRect (const QFont &) const
int xAxis () const
int yAxis () const
virtual ~QwtPlotPicker ()

Protected Member Functions

virtual bool accept (QPolygon &) const
virtual QPolygon adjustedPoints (const QPolygon &) const
virtual void append (const QPoint &)
virtual void begin ()
virtual bool end (bool ok=true)
QPointF invTransform (const QPoint &) const
QRectF invTransform (const QRect &) const
virtual bool keyMatch (const KeyPattern &, const QKeyEvent *) const
virtual bool mouseMatch (const MousePattern &, const QMouseEvent *) const
virtual void move (const QPoint &)
const QPolygon & pickedPoints () const
virtual void remove ()
virtual void reset ()
const QWidget * rubberBandWidget () const
QRectF scaleRect () const
virtual void stretchSelection (const QSize &oldSize, const QSize &newSize)
virtual QwtText trackerText (const QPoint &) const
virtual QwtText trackerTextF (const QPointF &) const
const QWidget * trackerWidget () const
QPoint transform (const QPointF &) const
QRect transform (const QRectF &) const
virtual void transition (const QEvent *)
virtual void updateDisplay ()
virtual void widgetEnterEvent (QEvent *)
virtual void widgetKeyPressEvent (QKeyEvent *)
virtual void widgetKeyReleaseEvent (QKeyEvent *)
virtual void widgetLeaveEvent (QEvent *)
virtual void widgetMouseDoubleClickEvent (QMouseEvent *)
virtual void widgetMouseMoveEvent (QMouseEvent *)
virtual void widgetMousePressEvent (QMouseEvent *)
virtual void widgetMouseReleaseEvent (QMouseEvent *)
virtual void widgetWheelEvent (QWheelEvent *)


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.


Member Enumeration Documentation

enum QwtPicker::DisplayMode [inherited]

Display mode.

See also:
setTrackerMode(), trackerMode(), isActive()
Enumerator:
AlwaysOff  Display never.
AlwaysOn  Display always.
ActiveOnly  Display only when the selection is active.

Symbolic keyboard input codes.

Default initialization:

  • KeySelect1
    Qt::Key_Return
  • KeySelect2
    Qt::Key_Space
  • KeyAbort
    Qt::Key_Escape

  • KeyLeft
    Qt::Key_Left
  • KeyRight
    Qt::Key_Right
  • KeyUp
    Qt::Key_Up
  • KeyDown
    Qt::Key_Down

  • KeyUndo
    Qt::Key_Minus
  • KeyRedo
    Qt::Key_Plus
  • KeyHome
    Qt::Key_Escape

Symbolic mouse input codes.

The default initialization for 3 button mice is:

  • MouseSelect1
    Qt::LeftButton
  • MouseSelect2
    Qt::RightButton
  • MouseSelect3
    Qt::MidButton
  • MouseSelect4
    Qt::LeftButton + Qt::ShiftButton
  • MouseSelect5
    Qt::RightButton + Qt::ShiftButton
  • MouseSelect6
    Qt::MidButton + Qt::ShiftButton

The default initialization for 2 button mice is:

  • MouseSelect1
    Qt::LeftButton
  • MouseSelect2
    Qt::RightButton
  • MouseSelect3
    Qt::LeftButton + Qt::AltButton
  • MouseSelect4
    Qt::LeftButton + Qt::ShiftButton
  • MouseSelect5
    Qt::RightButton + Qt::ShiftButton
  • MouseSelect6
    Qt::LeftButton + Qt::AltButton + Qt::ShiftButton

The default initialization for 1 button mice is:

  • MouseSelect1
    Qt::LeftButton
  • MouseSelect2
    Qt::LeftButton + Qt::ControlButton
  • MouseSelect3
    Qt::LeftButton + Qt::AltButton
  • MouseSelect4
    Qt::LeftButton + Qt::ShiftButton
  • MouseSelect5
    Qt::LeftButton + Qt::ControlButton + Qt::ShiftButton
  • MouseSelect6
    Qt::LeftButton + Qt::AltButton + Qt::ShiftButton

See also:
initMousePattern()

enum QwtPicker::ResizeMode [inherited]

Controls what to do with the selected points of an active selection when the observed widget is resized.

The default value is QwtPicker::Stretch.

See also:
setResizeMode()
Enumerator:
Stretch  All points are scaled according to the new size,.
KeepSize  All points remain unchanged.

enum QwtPicker::RubberBand [inherited]

Rubberband style

The default value is QwtPicker::NoRubberBand.

See also:
setRubberBand(), rubberBand()
Enumerator:
NoRubberBand  No rubberband.
HLineRubberBand  A horizontal line ( only for QwtPicker::PointSelection ).
VLineRubberBand  A vertical line ( only for QwtPicker::PointSelection ).
CrossRubberBand  A crosshair ( only for QwtPicker::PointSelection ).
RectRubberBand  A rectangle ( only for QwtPicker::RectSelection ).
EllipseRubberBand  An ellipse ( only for QwtPicker::RectSelection ).
PolygonRubberBand  A polygon ( only for QwtPicker::&PolygonSelection ).
UserRubberBand  Values >= UserRubberBand can be used to define additional rubber bands.


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 ( 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(), scaleRect()

QwtPlotPicker::QwtPlotPicker ( int  xAxis,
int  yAxis,
RubberBand  rubberBand,
DisplayMode  trackerMode,
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

bool QwtPicker::accept ( QPolygon &  selection  )  const [protected, virtual, inherited]

Validate and fixup the selection.

Accepts all selections unmodified

Parameters:
selection Selection to validate and fixup
Returns:
true, when accepted, false otherwise

Reimplemented in QwtPlotZoomer.

void QwtPicker::activated ( bool  on  )  [signal, inherited]

A signal indicating, when the picker has been activated. Together with setEnabled() it can be used to implement selections with more than one picker.

Parameters:
on True, when the picker has been activated

QPolygon QwtPicker::adjustedPoints ( const QPolygon &  points  )  const [protected, virtual, inherited]

Map the pickedPoints() into a selection().

adjustedPoints() maps the points, that have been collected on the parentWidget() into a selection(). The default implementation simply returns the points unmodified.

The reason, why a selection() differs from the picked points depends on the application requirements. F.e. :

  • A rectangular selection might need to have a specific aspect ratio only.
  • A selection could accept non intersecting polygons only.
  • ...

The example below is for a rectangular selection, where the first point is the center of the selected rectangle.

Example
QPolygon MyPicker::adjustedPoints(const QPolygon &points) const
{
    QPolygon adjusted;
    if ( points.size() == 2 )
    {
        const int width = qAbs(points[1].x() - points[0].x());
        const int height = qAbs(points[1].y() - points[0].y());

        QRect rect(0, 0, 2 * width, 2 * height);
        rect.moveCenter(points[0]);

        adjusted += rect.topLeft();
        adjusted += rect.bottomRight();
    }
    return adjusted;
}

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 QwtPicker::appended ( const QPoint &  pos  )  [signal, inherited]

A signal emitted when a point has been appended to the selection

Parameters:
pos Position of the appended point.
See also:
append(). moved()

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()

void QwtPicker::begin (  )  [protected, virtual, inherited]

Open a selection setting the state to active

See also:
isActive(), end(), append(), move()

Reimplemented in QwtPlotZoomer.

const QwtPlotCanvas * QwtPlotPicker::canvas (  )  const

Return Observed plot canvas.

QwtPlotCanvas * QwtPlotPicker::canvas (  ) 

Return observed plot canvas.

void QwtPicker::changed ( const QPolygon &  selection  )  [signal, inherited]

A signal emitted when the active selection has been changed. This might happen when the observed widget is resized.

Parameters:
selection Changed selection
See also:
stretchSelection()

void QwtPicker::drawRubberBand ( QPainter *  painter  )  const [virtual, inherited]

Draw a rubberband, depending on rubberBand()

Parameters:
painter Painter, initialized with clip rect
See also:
rubberBand(), RubberBand

void QwtPicker::drawTracker ( QPainter *  painter  )  const [virtual, inherited]

Draw the tracker

Parameters:
painter Painter
See also:
trackerRect(), trackerText()

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.

bool QwtPicker::eventFilter ( QObject *  object,
QEvent *  event 
) [virtual, inherited]

Event filter.

When isEnabled() == true all events of the observed widget are filtered. Mouse and keyboard events are translated into widgetMouse- and widgetKey- and widgetWheel-events. Paint and Resize events are handled to keep rubberband and tracker up to date.

Parameters:
object Object to be filtered
event Event
See also:
widgetEnterEvent(), widgetLeaveEvent(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent(), QObject::installEventFilter(), QObject::event()

void QwtEventPattern::initKeyPattern (  )  [inherited]

Set default mouse patterns.

See also:
KeyPatternCode

void QwtEventPattern::initMousePattern ( int  numButtons  )  [inherited]

Set default mouse patterns, depending on the number of mouse buttons

Parameters:
numButtons Number of mouse buttons ( <= 3 )
See also:
MousePatternCode

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()

bool QwtPicker::isActive (  )  const [inherited]

A picker is active between begin() and end().

Returns:
true if the selection is active.

bool QwtPicker::isEnabled (  )  const [inherited]

Returns:
true when enabled, false otherwise
See also:
setEnabled(), eventFilter()

bool QwtEventPattern::keyMatch ( const KeyPattern pattern,
const QKeyEvent *  event 
) const [protected, virtual, inherited]

Compare a key event with an event pattern.

A key event matches the pattern when both have the same key value and in the state value the same key flags (Qt::KeyButtonMask) are set.

Parameters:
pattern Key event pattern
event Key event
Returns:
true if matches
See also:
mouseMatch()

bool QwtEventPattern::keyMatch ( uint  pattern,
const QKeyEvent *  event 
) const [inherited]

Compare a key event with an event pattern.

A key event matches the pattern when both have the same key value and in the state value the same key flags (Qt::KeyButtonMask) are set.

Parameters:
pattern Index of the event pattern
event Key event
Returns:
true if matches
See also:
mouseMatch()

QVector< QwtEventPattern::KeyPattern > & QwtEventPattern::keyPattern (  )  [inherited]

Return Key patterns.

const QVector< QwtEventPattern::KeyPattern > & QwtEventPattern::keyPattern (  )  const [inherited]

Return key patterns.

bool QwtEventPattern::mouseMatch ( const MousePattern pattern,
const QMouseEvent *  event 
) const [protected, virtual, inherited]

Compare a mouse event with an event pattern.

A mouse event matches the pattern when both have the same button value and in the state value the same key flags(Qt::KeyButtonMask) are set.

Parameters:
pattern Mouse event pattern
event Mouse event
Returns:
true if matches
See also:
keyMatch()

bool QwtEventPattern::mouseMatch ( uint  pattern,
const QMouseEvent *  event 
) const [inherited]

Compare a mouse event with an event pattern.

A mouse event matches the pattern when both have the same button value and in the state value the same key flags(Qt::KeyButtonMask) are set.

Parameters:
pattern Index of the event pattern
event Mouse event
Returns:
true if matches
See also:
keyMatch()

QVector< QwtEventPattern::MousePattern > & QwtEventPattern::mousePattern (  )  [inherited]

Return ,ouse patterns.

const QVector< QwtEventPattern::MousePattern > & QwtEventPattern::mousePattern (  )  const [inherited]

Return mouse patterns.

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 QwtPicker::moved ( const QPoint &  pos  )  [signal, inherited]

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()

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 QWidget * QwtPicker::parentWidget (  )  const [inherited]

Return the parent widget, where the selection happens.

QWidget * QwtPicker::parentWidget (  )  [inherited]

Return the parent widget, where the selection happens.

const QPolygon & QwtPicker::pickedPoints (  )  const [protected, inherited]

Return the points, that have been collected so far. The selection() is calculated from the pickedPoints() in adjustedPoints().

Returns:
Picked points

QRect QwtPicker::pickRect (  )  const [virtual, inherited]

Find the area of the observed widget, where selection might happen.

Returns:
parentWidget()->contentsRect()

const QwtPlot * QwtPlotPicker::plot (  )  const

Return plot widget, containing the observed plot canvas.

QwtPlot * QwtPlotPicker::plot (  ) 

Return plot widget, containing the observed plot canvas.

void QwtPicker::remove (  )  [protected, virtual, inherited]

Remove the last point of the selection The removed() signal is emitted.

See also:
isActive(), begin(), end(), append(), move()

void QwtPicker::removed ( const QPoint &  pos  )  [signal, inherited]

A signal emitted whenever the last appended point of the selection has been removed.

See also:
remove(), appended()

void QwtPicker::reset (  )  [protected, virtual, inherited]

Reset the state machine and terminate (end(false)) the selection

QwtPicker::ResizeMode QwtPicker::resizeMode (  )  const [inherited]

Returns:
Resize mode
See also:
setResizeMode(), ResizeMode

QwtPicker::RubberBand QwtPicker::rubberBand (  )  const [inherited]

Returns:
Rubberband style
See also:
setRubberBand(), RubberBand, rubberBandPen()

QPen QwtPicker::rubberBandPen (  )  const [inherited]

Returns:
Rubberband pen
See also:
setRubberBandPen(), rubberBand()

const QWidget * QwtPicker::rubberBandWidget (  )  const [protected, inherited]

Returns:
Widget displaying the rubberband

QRectF QwtPlotPicker::scaleRect (  )  const [protected]

Return normalized bounding rect of the axes

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

void QwtPicker::selected ( const QPolygon &  polygon  )  [signal, inherited]

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

Parameters:
polygon Selected points

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::selected ( const QRectF &  rect  )  [signal]

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

Parameters:
rect Selected rectangle

void QwtPlotPicker::selected ( const QPointF &  pos  )  [signal]

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

Parameters:
pos Selected point

QPolygon QwtPicker::selection (  )  const [inherited]

Returns:
Selected points
See also:
pickedPoints(), adjustedPoints()

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.

void QwtPicker::setEnabled ( bool  enabled  )  [slot, inherited]

En/disable the picker.

When enabled is true an event filter is installed for the observed widget, otherwise the event filter is removed.

Parameters:
enabled true or false
See also:
isEnabled(), eventFilter()

void QwtEventPattern::setKeyPattern ( const QVector< KeyPattern > &  pattern  )  [inherited]

Change the key event patterns.

void QwtEventPattern::setKeyPattern ( uint  pattern,
int  key,
int  state = Qt::NoButton 
) [inherited]

Change one key pattern

Parameters:
pattern Index of the pattern
key Key
state State
See also:
QKeyEvent

void QwtEventPattern::setMousePattern ( const QVector< MousePattern > &  pattern  )  [inherited]

Change the mouse event patterns.

void QwtEventPattern::setMousePattern ( uint  pattern,
int  button,
int  state = Qt::NoButton 
) [inherited]

Change one mouse pattern

Parameters:
pattern Index of the pattern
button Button
state State
See also:
QMouseEvent

void QwtPicker::setResizeMode ( ResizeMode  mode  )  [inherited]

Set the resize mode.

The resize mode controls what to do with the selected points of an active selection when the observed widget is resized.

Stretch means the points are scaled according to the new size, KeepSize means the points remain unchanged.

The default mode is Stretch.

Parameters:
mode Resize mode
See also:
resizeMode(), ResizeMode

void QwtPicker::setRubberBand ( RubberBand  rubberBand  )  [inherited]

Set the rubberband style

Parameters:
rubberBand Rubberband style The default value is NoRubberBand.
See also:
rubberBand(), RubberBand, setRubberBandPen()

void QwtPicker::setRubberBandPen ( const QPen &  pen  )  [inherited]

Set the pen for the rubberband

Parameters:
pen Rubberband pen
See also:
rubberBandPen(), setRubberBand()

void QwtPicker::setStateMachine ( QwtPickerMachine stateMachine  )  [inherited]

Set a state machine and delete the previous one

Parameters:
stateMachine State machine
See also:
stateMachine()

void QwtPicker::setTrackerFont ( const QFont &  font  )  [inherited]

Set the font for the tracker

Parameters:
font Tracker font
See also:
trackerFont(), setTrackerMode(), setTrackerPen()

void QwtPicker::setTrackerMode ( DisplayMode  mode  )  [inherited]

Set the display mode of the tracker.

A tracker displays information about current position of the cursor as a string. The display mode controls if the tracker has to be displayed whenever the observed widget has focus and cursor (AlwaysOn), never (AlwaysOff), or only when the selection is active (ActiveOnly).

Parameters:
mode Tracker display mode
Warning:
In case of AlwaysOn, mouseTracking will be enabled for the observed widget.
See also:
trackerMode(), DisplayMode

void QwtPicker::setTrackerPen ( const QPen &  pen  )  [inherited]

Set the pen for the tracker

Parameters:
pen Tracker pen
See also:
trackerPen(), setTrackerMode(), setTrackerFont()

QwtPickerMachine * QwtPicker::stateMachine (  )  [inherited]

Returns:
Assigned state machine
See also:
setStateMachine()

const QwtPickerMachine * QwtPicker::stateMachine (  )  const [inherited]

Returns:
Assigned state machine
See also:
setStateMachine()

void QwtPicker::stretchSelection ( const QSize &  oldSize,
const QSize &  newSize 
) [protected, virtual, inherited]

Scale the selection by the ratios of oldSize and newSize The changed() signal is emitted.

Parameters:
oldSize Previous size
newSize Current size
See also:
ResizeMode, setResizeMode(), resizeMode()

QFont QwtPicker::trackerFont (  )  const [inherited]

Returns:
Tracker font
See also:
setTrackerFont(), trackerMode(), trackerPen()

QwtPicker::DisplayMode QwtPicker::trackerMode (  )  const [inherited]

Returns:
Tracker display mode
See also:
setTrackerMode(), DisplayMode

QPen QwtPicker::trackerPen (  )  const [inherited]

Returns:
Tracker pen
See also:
setTrackerPen(), trackerMode(), trackerFont()

QPoint QwtPicker::trackerPosition (  )  const [inherited]

Returns:
Current position of the tracker

QRect QwtPicker::trackerRect ( const QFont &  font  )  const [virtual, inherited]

Calculate the bounding rectangle for the tracker text from the current position of the tracker

Parameters:
font Font of the tracker text
Returns:
Bounding rectangle of the tracker text
See also:
trackerPosition()

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

const QWidget * QwtPicker::trackerWidget (  )  const [protected, inherited]

Returns:
Widget displaying the tracker text

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

Translate a point from plot into pixel coordinates

Returns:
Point in pixel coordinates
See also:
invTransform()

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

Translate a rectangle from plot into pixel coordinates

Returns:
Rectangle in pixel coordinates
See also:
invTransform()

void QwtPicker::transition ( const QEvent *  event  )  [protected, virtual, inherited]

Passes an event to the state machine and executes the resulting commands. Append and Move commands use the current position of the cursor (QCursor::pos()).

Parameters:
event Event

void QwtPicker::updateDisplay (  )  [protected, virtual, inherited]

Update the state of rubberband and tracker label.

void QwtPicker::widgetEnterEvent ( QEvent *  event  )  [protected, virtual, inherited]

void QwtPicker::widgetKeyPressEvent ( QKeyEvent *  keyEvent  )  [protected, virtual, inherited]

Handle a key press event for the observed widget.

Selections can be completely done by the keyboard. The arrow keys move the cursor, the abort key aborts a selection. All other keys are handled by the current state machine.

Parameters:
keyEvent Key event
See also:
eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyReleaseEvent(), stateMachine(), QwtEventPattern::KeyPatternCode

Reimplemented in QwtPlotZoomer.

void QwtPicker::widgetKeyReleaseEvent ( QKeyEvent *  keyEvent  )  [protected, virtual, inherited]

Handle a key release event for the observed widget.

Passes the event to the state machine.

Parameters:
keyEvent Key event
See also:
eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent(), stateMachine()

void QwtPicker::widgetLeaveEvent ( QEvent *  event  )  [protected, virtual, inherited]

void QwtPicker::widgetMouseDoubleClickEvent ( QMouseEvent *  mouseEvent  )  [protected, virtual, inherited]

Handle mouse double click event for the observed widget.

Parameters:
mouseEvent Mouse event
See also:
eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent()

void QwtPicker::widgetMouseMoveEvent ( QMouseEvent *  mouseEvent  )  [protected, virtual, inherited]

Handle a mouse move event for the observed widget.

Parameters:
mouseEvent Mouse event
See also:
eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent()

void QwtPicker::widgetMousePressEvent ( QMouseEvent *  mouseEvent  )  [protected, virtual, inherited]

Handle a mouse press event for the observed widget.

Parameters:
mouseEvent Mouse event
See also:
eventFilter(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent()

void QwtPicker::widgetMouseReleaseEvent ( QMouseEvent *  mouseEvent  )  [protected, virtual, inherited]

Handle a mouse relase event for the observed widget.

Parameters:
mouseEvent Mouse event
See also:
eventFilter(), widgetMousePressEvent(), widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent()

Reimplemented in QwtPlotZoomer.

void QwtPicker::widgetWheelEvent ( QWheelEvent *  wheelEvent  )  [protected, virtual, inherited]

Handle a wheel event for the observed widget.

Move the last point of the selection in case of isActive() == true

Parameters:
wheelEvent Wheel event
See also:
eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent()

int QwtPlotPicker::xAxis (  )  const

Return x axis.

int QwtPlotPicker::yAxis (  )  const

Return y axis.


Generated on Wed Jan 11 15:23:03 2012 for Qwt User's Guide by  doxygen 1.5.9