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Qwt User's Guide
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#include <qwt_plot_zoomer.h>
Inherits QwtPlotPicker.
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 | moveBy (double x, double y) |
| virtual void | moveTo (const QPointF &) |
| void | setEnabled (bool) |
| virtual void | zoom (const QRectF &) |
| virtual void | zoom (int up) |
Signals | |
| void | activated (bool on) |
| void | appended (const QPointF &pos) |
| void | appended (const QPoint &pos) |
| void | changed (const QPolygon &selection) |
| void | moved (const QPointF &pos) |
| void | moved (const QPoint &pos) |
| void | removed (const QPoint &pos) |
| void | selected (const QPointF &pos) |
| void | selected (const QRectF &rect) |
| void | selected (const QVector< QPointF > &pa) |
| void | selected (const QPolygon &polygon) |
| void | zoomed (const QRectF &rect) |
Public Member Functions | |
| QwtPlotCanvas * | canvas () |
| const QwtPlotCanvas * | canvas () const |
| 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 |
| const QVector< KeyPattern > & | keyPattern () const |
| QVector< KeyPattern > & | keyPattern () |
| int | maxStackDepth () const |
| bool | mouseMatch (uint pattern, const QMouseEvent *) const |
| const QVector< MousePattern > & | mousePattern () const |
| QVector< MousePattern > & | mousePattern () |
| QWidget * | parentWidget () |
| const QWidget * | parentWidget () const |
| virtual QRect | pickRect () const |
| QwtPlot * | plot () |
| const QwtPlot * | plot () const |
| QwtPlotZoomer (QwtPlotCanvas *, bool doReplot=true) | |
| QwtPlotZoomer (int xAxis, int yAxis, QwtPlotCanvas *, bool doReplot=true) | |
| ResizeMode | resizeMode () const |
| RubberBand | rubberBand () const |
| QPen | rubberBandPen () const |
| QPolygon | selection () const |
| virtual void | setAxis (int xAxis, int yAxis) |
| void | setKeyPattern (uint pattern, int key, int state=Qt::NoButton) |
| void | setKeyPattern (const QVector< KeyPattern > &) |
| void | setMaxStackDepth (int) |
| void | setMousePattern (uint pattern, int button, int state=Qt::NoButton) |
| void | setMousePattern (const QVector< MousePattern > &) |
| void | setResizeMode (ResizeMode) |
| void | setRubberBand (RubberBand) |
| void | setRubberBandPen (const QPen &) |
| void | setStateMachine (QwtPickerMachine *) |
| void | setTrackerFont (const QFont &) |
| void | setTrackerMode (DisplayMode) |
| void | setTrackerPen (const QPen &) |
| virtual void | setZoomBase (bool doReplot=true) |
| virtual void | setZoomBase (const QRectF &) |
| void | setZoomStack (const QStack< QRectF > &, int zoomRectIndex=-1) |
| const QwtPickerMachine * | stateMachine () const |
| QwtPickerMachine * | stateMachine () |
| QFont | trackerFont () const |
| DisplayMode | trackerMode () const |
| QPen | trackerPen () const |
| QPoint | trackerPosition () const |
| virtual QRect | trackerRect (const QFont &) const |
| int | xAxis () const |
| int | yAxis () const |
| QRectF | zoomBase () const |
| QRectF | zoomRect () const |
| uint | zoomRectIndex () const |
| const QStack< QRectF > & | zoomStack () const |
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) |
| QRectF | invTransform (const QRect &) const |
| QPointF | invTransform (const QPoint &) const |
| virtual bool | keyMatch (const KeyPattern &, const QKeyEvent *) const |
| virtual QSizeF | minZoomSize () const |
| virtual bool | mouseMatch (const MousePattern &, const QMouseEvent *) const |
| virtual void | move (const QPoint &) |
| const QPolygon & | pickedPoints () const |
| virtual void | remove () |
| virtual void | rescale () |
| 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 |
| QRect | transform (const QRectF &) const |
| QPoint | transform (const QPointF &) 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 *) |
QwtPlotZoomer provides stacked zooming for a plot widget.
QwtPlotZoomer offers rubberband selections on the plot canvas, translating the selected rectangles into plot coordinates and adjusting the axes to them. Zooming can repeated as often as possible, limited only by maxStackDepth() or minZoomSize(). Each rectangle is pushed on a stack.
Zoom rectangles can be selected depending on selectionFlags() using the mouse or keyboard (QwtEventPattern, QwtPickerMachine). QwtEventPattern::MouseSelect3,QwtEventPattern::KeyUndo, or QwtEventPattern::MouseSelect6,QwtEventPattern::KeyRedo walk up and down the zoom stack. QwtEventPattern::MouseSelect2 or QwtEventPattern::KeyHome unzoom to the initial size.
QwtPlotZoomer is tailored for plots with one x and y axis, but it is allowed to attach a second QwtPlotZoomer for the other axes.
enum QwtPicker::DisplayMode [inherited] |
Display mode.
enum QwtEventPattern::KeyPatternCode [inherited] |
Symbolic keyboard input codes.
Default initialization:
enum QwtEventPattern::MousePatternCode [inherited] |
Symbolic mouse input codes.
The default initialization for 3 button mice is:
The default initialization for 2 button mice is:
The default initialization for 1 button mice is:
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.
enum QwtPicker::RubberBand [inherited] |
Rubberband style
The default value is QwtPicker::NoRubberBand.
| 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. |
| QwtPlotZoomer::QwtPlotZoomer | ( | QwtPlotCanvas * | canvas, |
| bool | doReplot = true |
||
| ) | [explicit] |
Create a zoomer for a plot canvas.
The zoomer is set to those x- and y-axis of the parent plot of the canvas 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.
The zoomer is initialized with a QwtPickerDragRectMachine, the tracker mode is set to QwtPicker::ActiveOnly and the rubberband is set to QwtPicker::RectRubberBand
| canvas | Plot canvas to observe, also the parent object |
| doReplot | Call replot for the attached plot before initializing the zoomer with its scales. This might be necessary, when the plot is in a state with pending scale changes. |
| QwtPlotZoomer::QwtPlotZoomer | ( | int | xAxis, |
| int | yAxis, | ||
| QwtPlotCanvas * | canvas, | ||
| bool | doReplot = true |
||
| ) | [explicit] |
Create a zoomer for a plot canvas.
The zoomer is initialized with a QwtPickerDragRectMachine, the tracker mode is set to QwtPicker::ActiveOnly and the rubberband is set to QwtPicker;;RectRubberBand
| xAxis | X axis of the zoomer |
| yAxis | Y axis of the zoomer |
| canvas | Plot canvas to observe, also the parent object |
| doReplot | Call replot for the attached plot before initializing the zoomer with its scales. This might be necessary, when the plot is in a state with pending scale changes. |
| bool QwtPlotZoomer::accept | ( | QPolygon & | pa | ) | const [protected, virtual] |
Check and correct a selected rectangle.
Reject rectangles with a hight or width < 2, otherwise expand the selected rectangle to a minimum size of 11x11 and accept it.
Reimplemented from QwtPicker.
| 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.
| 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. :
The example below is for a rectangular selection, where the first point is the center of the selected rectangle.
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, inherited] |
Append a point to the selection and update rubberband and tracker.
| pos | Additional point |
Reimplemented from QwtPicker.
| void QwtPlotPicker::appended | ( | const QPointF & | pos | ) | [signal, inherited] |
| void QwtPicker::appended | ( | const QPoint & | pos | ) | [signal, inherited] |
| void QwtPlotZoomer::begin | ( | ) | [protected, virtual] |
Rejects selections, when the stack depth is too deep, or the zoomed rectangle is minZoomSize().
Reimplemented from QwtPicker.
| QwtPlotCanvas * QwtPlotPicker::canvas | ( | ) | [inherited] |
Return observed plot canvas.
| const QwtPlotCanvas * QwtPlotPicker::canvas | ( | ) | const [inherited] |
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.
| selection | Changed selection |
| void QwtPicker::drawRubberBand | ( | QPainter * | painter | ) | const [virtual, inherited] |
Draw a rubberband, depending on rubberBand()
| painter | Painter, initialized with clip rect |
| void QwtPicker::drawTracker | ( | QPainter * | painter | ) | const [virtual, inherited] |
| bool QwtPlotZoomer::end | ( | bool | ok = true | ) | [protected, virtual] |
Expand the selected rectangle to minZoomSize() and zoom in if accepted.
Reimplemented from QwtPlotPicker.
| 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.
| object | Object to be filtered |
| event | Event |
| void QwtEventPattern::initKeyPattern | ( | ) | [inherited] |
Set default mouse patterns.
| void QwtEventPattern::initMousePattern | ( | int | numButtons | ) | [inherited] |
Set default mouse patterns, depending on the number of mouse buttons
| numButtons | Number of mouse buttons ( <= 3 ) |
| QRectF QwtPlotPicker::invTransform | ( | const QRect & | rect | ) | const [protected, inherited] |
Translate a rectangle from pixel into plot coordinates
| QPointF QwtPlotPicker::invTransform | ( | const QPoint & | pos | ) | const [protected, inherited] |
Translate a point from pixel into plot coordinates
| bool QwtPicker::isActive | ( | ) | const [inherited] |
| bool QwtPicker::isEnabled | ( | ) | const [inherited] |
| 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.
| pattern | Index of the event pattern |
| event | Key event |
| 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.
| pattern | Key event pattern |
| event | Key event |
| const QVector< QwtEventPattern::KeyPattern > & QwtEventPattern::keyPattern | ( | ) | const [inherited] |
Return key patterns.
| QVector< QwtEventPattern::KeyPattern > & QwtEventPattern::keyPattern | ( | ) | [inherited] |
Return Key patterns.
| int QwtPlotZoomer::maxStackDepth | ( | ) | const |
| QSizeF QwtPlotZoomer::minZoomSize | ( | ) | const [protected, virtual] |
Limit zooming by a minimum rectangle.
| 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.
| pattern | Index of the event pattern |
| event | Mouse event |
| 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.
| pattern | Mouse event pattern |
| event | Mouse event |
| const QVector< QwtEventPattern::MousePattern > & QwtEventPattern::mousePattern | ( | ) | const [inherited] |
Return mouse patterns.
| QVector< QwtEventPattern::MousePattern > & QwtEventPattern::mousePattern | ( | ) | [inherited] |
Return ,ouse patterns.
| void QwtPlotPicker::move | ( | const QPoint & | pos | ) | [protected, virtual, inherited] |
| void QwtPlotZoomer::moveBy | ( | double | dx, |
| double | dy | ||
| ) | [slot] |
Move the current zoom rectangle.
| dx | X offset |
| dy | Y offset |
| void QwtPlotPicker::moved | ( | const QPointF & | pos | ) | [signal, inherited] |
A signal emitted whenever the last appended point of the selection has been moved.
| pos | Position of the moved last point of the selection. |
| void QwtPicker::moved | ( | const QPoint & | pos | ) | [signal, inherited] |
A signal emitted whenever the last appended point of the selection has been moved.
| pos | Position of the moved last point of the selection. |
| void QwtPlotZoomer::moveTo | ( | const QPointF & | pos | ) | [virtual, slot] |
Move the the current zoom rectangle.
| pos | New position |
| QWidget * QwtPicker::parentWidget | ( | ) | [inherited] |
Return the parent widget, where the selection happens.
| const QWidget * QwtPicker::parentWidget | ( | ) | const [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().
| QRect QwtPicker::pickRect | ( | ) | const [virtual, inherited] |
Find the area of the observed widget, where selection might happen.
| QwtPlot * QwtPlotPicker::plot | ( | ) | [inherited] |
Return plot widget, containing the observed plot canvas.
| const QwtPlot * QwtPlotPicker::plot | ( | ) | const [inherited] |
Return plot widget, containing the observed plot canvas.
| void QwtPicker::remove | ( | ) | [protected, virtual, inherited] |
| void QwtPicker::removed | ( | const QPoint & | pos | ) | [signal, inherited] |
A signal emitted whenever the last appended point of the selection has been removed.
| void QwtPlotZoomer::rescale | ( | ) | [protected, virtual] |
Adjust the observed plot to zoomRect()
| void QwtPicker::reset | ( | ) | [protected, virtual, inherited] |
Reset the state machine and terminate (end(false)) the selection
| QwtPicker::ResizeMode QwtPicker::resizeMode | ( | ) | const [inherited] |
| QwtPicker::RubberBand QwtPicker::rubberBand | ( | ) | const [inherited] |
| QPen QwtPicker::rubberBandPen | ( | ) | const [inherited] |
| const QWidget * QwtPicker::rubberBandWidget | ( | ) | const [protected, inherited] |
| QRectF QwtPlotPicker::scaleRect | ( | ) | const [protected, inherited] |
Return normalized bounding rect of the axes
| void QwtPlotPicker::selected | ( | const QPointF & | pos | ) | [signal, inherited] |
A signal emitted in case of selectionFlags() & PointSelection.
| pos | Selected point |
| void QwtPlotPicker::selected | ( | const QRectF & | rect | ) | [signal, inherited] |
A signal emitted in case of selectionFlags() & RectSelection.
| rect | Selected rectangle |
| void QwtPlotPicker::selected | ( | const QVector< QPointF > & | pa | ) | [signal, inherited] |
A signal emitting the selected points, at the end of a selection.
| pa | Selected points |
| void QwtPicker::selected | ( | const QPolygon & | polygon | ) | [signal, inherited] |
A signal emitting the selected points, at the end of a selection.
| polygon | Selected points |
| QPolygon QwtPicker::selection | ( | ) | const [inherited] |
| void QwtPlotZoomer::setAxis | ( | int | xAxis, |
| int | yAxis | ||
| ) | [virtual] |
Reinitialize the axes, and set the zoom base to their scales.
| xAxis | X axis |
| yAxis | Y axis |
Reimplemented from QwtPlotPicker.
| 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.
| enabled | true or false |
| void QwtEventPattern::setKeyPattern | ( | uint | pattern, |
| int | key, | ||
| int | state = Qt::NoButton |
||
| ) | [inherited] |
Change one key pattern
| pattern | Index of the pattern |
| key | Key |
| state | State |
| void QwtEventPattern::setKeyPattern | ( | const QVector< KeyPattern > & | pattern | ) | [inherited] |
Change the key event patterns.
| void QwtPlotZoomer::setMaxStackDepth | ( | int | depth | ) |
Limit the number of recursive zoom operations to depth.
A value of -1 set the depth to unlimited, 0 disables zooming. If the current zoom rectangle is below depth, the plot is unzoomed.
| depth | Maximum for the stack depth |
| void QwtEventPattern::setMousePattern | ( | uint | pattern, |
| int | button, | ||
| int | state = Qt::NoButton |
||
| ) | [inherited] |
Change one mouse pattern
| pattern | Index of the pattern |
| button | Button |
| state | State |
| void QwtEventPattern::setMousePattern | ( | const QVector< MousePattern > & | pattern | ) | [inherited] |
Change the mouse event patterns.
| 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.
| mode | Resize mode |
| void QwtPicker::setRubberBand | ( | RubberBand | rubberBand | ) | [inherited] |
Set the rubberband style
| rubberBand | Rubberband style The default value is NoRubberBand. |
| void QwtPicker::setRubberBandPen | ( | const QPen & | pen | ) | [inherited] |
Set the pen for the rubberband
| pen | Rubberband pen |
| void QwtPicker::setStateMachine | ( | QwtPickerMachine * | stateMachine | ) | [inherited] |
Set a state machine and delete the previous one
| stateMachine | State machine |
| void QwtPicker::setTrackerFont | ( | const QFont & | font | ) | [inherited] |
Set the font for the tracker
| font | Tracker font |
| 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).
| mode | Tracker display mode |
| void QwtPicker::setTrackerPen | ( | const QPen & | pen | ) | [inherited] |
Set the pen for the tracker
| pen | Tracker pen |
| void QwtPlotZoomer::setZoomBase | ( | bool | doReplot = true | ) | [virtual] |
Reinitialized the zoom stack with scaleRect() as base.
| doReplot | Call replot for the attached plot before initializing the zoomer with its scales. This might be necessary, when the plot is in a state with pending scale changes. |
| void QwtPlotZoomer::setZoomBase | ( | const QRectF & | base | ) | [virtual] |
Set the initial size of the zoomer.
base is united with the current scaleRect() and the zoom stack is reinitalized with it as zoom base. plot is zoomed to scaleRect().
| base | Zoom base |
| void QwtPlotZoomer::setZoomStack | ( | const QStack< QRectF > & | zoomStack, |
| int | zoomRectIndex = -1 |
||
| ) |
Assign a zoom stack.
In combination with other types of navigation it might be useful to modify to manipulate the complete zoom stack.
| zoomStack | New zoom stack |
| zoomRectIndex | Index of the current position of zoom stack. In case of -1 the current position is at the top of the stack. |
| const QwtPickerMachine * QwtPicker::stateMachine | ( | ) | const [inherited] |
| QwtPickerMachine * QwtPicker::stateMachine | ( | ) | [inherited] |
| 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.
| oldSize | Previous size |
| newSize | Current size |
| QFont QwtPicker::trackerFont | ( | ) | const [inherited] |
| QwtPicker::DisplayMode QwtPicker::trackerMode | ( | ) | const [inherited] |
| QPen QwtPicker::trackerPen | ( | ) | const [inherited] |
| QPoint QwtPicker::trackerPosition | ( | ) | const [inherited] |
| QRect QwtPicker::trackerRect | ( | const QFont & | font | ) | const [virtual, inherited] |
Calculate the bounding rectangle for the tracker text from the current position of the tracker
| font | Font of the tracker text |
| QwtText QwtPlotPicker::trackerText | ( | const QPoint & | pos | ) | const [protected, virtual, inherited] |
Translate a pixel position into a position string
| pos | Position in pixel coordinates |
Reimplemented from QwtPicker.
| QwtText QwtPlotPicker::trackerTextF | ( | const QPointF & | pos | ) | const [protected, virtual, inherited] |
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".
| pos | Position |
| const QWidget * QwtPicker::trackerWidget | ( | ) | const [protected, inherited] |
| QRect QwtPlotPicker::transform | ( | const QRectF & | rect | ) | const [protected, inherited] |
Translate a rectangle from plot into pixel coordinates
| QPoint QwtPlotPicker::transform | ( | const QPointF & | pos | ) | const [protected, inherited] |
Translate a point from plot into pixel coordinates
| 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()).
| event | Event |
| void QwtPicker::updateDisplay | ( | ) | [protected, virtual, inherited] |
Update the state of rubberband and tracker label.
| void QwtPicker::widgetEnterEvent | ( | QEvent * | event | ) | [protected, virtual, inherited] |
Handle a enter event for the observed widget.
| event | Qt event |
| void QwtPlotZoomer::widgetKeyPressEvent | ( | QKeyEvent * | ke | ) | [protected, virtual] |
Qt::Key_Plus zooms in, Qt::Key_Minus zooms out one position on the zoom stack, Qt::Key_Escape zooms out to the zoom base.
Changes the current position on the stack, but doesn't pop any rectangle.
Reimplemented from QwtPicker.
| void QwtPicker::widgetKeyReleaseEvent | ( | QKeyEvent * | keyEvent | ) | [protected, virtual, inherited] |
Handle a key release event for the observed widget.
Passes the event to the state machine.
| keyEvent | Key event |
| void QwtPicker::widgetLeaveEvent | ( | QEvent * | event | ) | [protected, virtual, inherited] |
Handle a leave event for the observed widget.
| event | Qt event |
| void QwtPicker::widgetMouseDoubleClickEvent | ( | QMouseEvent * | mouseEvent | ) | [protected, virtual, inherited] |
Handle mouse double click event for the observed widget.
| mouseEvent | Mouse event |
| void QwtPicker::widgetMouseMoveEvent | ( | QMouseEvent * | mouseEvent | ) | [protected, virtual, inherited] |
Handle a mouse move event for the observed widget.
| mouseEvent | Mouse event |
| void QwtPicker::widgetMousePressEvent | ( | QMouseEvent * | mouseEvent | ) | [protected, virtual, inherited] |
Handle a mouse press event for the observed widget.
| mouseEvent | Mouse event |
| void QwtPlotZoomer::widgetMouseReleaseEvent | ( | QMouseEvent * | me | ) | [protected, virtual] |
Qt::MidButton zooms out one position on the zoom stack, Qt::RightButton to the zoom base.
Changes the current position on the stack, but doesn't pop any rectangle.
Reimplemented from QwtPicker.
| 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
| wheelEvent | Wheel event |
| int QwtPlotPicker::xAxis | ( | ) | const [inherited] |
Return x axis.
| int QwtPlotPicker::yAxis | ( | ) | const [inherited] |
Return y axis.
| void QwtPlotZoomer::zoom | ( | const QRectF & | rect | ) | [virtual, slot] |
Zoom in.
Clears all rectangles above the current position of the zoom stack and pushs the normalized rect on it.
| void QwtPlotZoomer::zoom | ( | int | offset | ) | [virtual, slot] |
Zoom in or out.
Activate a rectangle on the zoom stack with an offset relative to the current position. Negative values of offest will zoom out, positive zoom in. A value of 0 zooms out to the zoom base.
| offset | Offset relative to the current position of the zoom stack. |
| QRectF QwtPlotZoomer::zoomBase | ( | ) | const |
| void QwtPlotZoomer::zoomed | ( | const QRectF & | rect | ) | [signal] |
A signal emitting the zoomRect(), when the plot has been zoomed in or out.
| rect | Current zoom rectangle. |
| QRectF QwtPlotZoomer::zoomRect | ( | ) | const |
Rectangle at the current position on the zoom stack.
| uint QwtPlotZoomer::zoomRectIndex | ( | ) | const |
| const QStack< QRectF > & QwtPlotZoomer::zoomStack | ( | ) | const |
Return the zoom stack. zoomStack()[0] is the zoom base, zoomStack()[1] the first zoomed rectangle.