Eneboo - Documentación para desarrolladores
Clases | Slots públicos | Señales | Métodos públicos | Métodos protegidos
Referencia de la Clase QwtPlotZoomer

QwtPlotZoomer provides stacked zooming for a plot widget. Más...

#include <qwt_plot_zoomer.h>

Diagrama de herencias de QwtPlotZoomer
QwtPlotPicker QwtPicker QObject QwtEventPattern Qt Qt

Lista de todos los miembros.

Clases

class  PrivateData

Slots públicos

void moveBy (double x, double y)
virtual void move (double x, double y)
virtual void zoom (const QwtDoubleRect &)
 Zoom in.
virtual void zoom (int up)
 Zoom in or out.

Señales

void zoomed (const QwtDoubleRect &rect)

Métodos públicos

 QwtPlotZoomer (QwtPlotCanvas *, bool doReplot=true)
 Create a zoomer for a plot canvas.
 QwtPlotZoomer (int xAxis, int yAxis, QwtPlotCanvas *, bool doReplot=true)
 Create a zoomer for a plot canvas.
 QwtPlotZoomer (int xAxis, int yAxis, int selectionFlags, DisplayMode trackerMode, QwtPlotCanvas *, bool doReplot=true)
virtual ~QwtPlotZoomer ()
virtual void setZoomBase (bool doReplot=true)
virtual void setZoomBase (const QwtDoubleRect &)
 Set the initial size of the zoomer.
QwtDoubleRect zoomBase () const
QwtDoubleRect zoomRect () const
virtual void setAxis (int xAxis, int yAxis)
void setMaxStackDepth (int)
 Limit the number of recursive zoom operations to depth.
int maxStackDepth () const
const QValueStack
< QwtDoubleRect > & 
zoomStack () const
void setZoomStack (const QValueStack< QwtDoubleRect > &, int zoomRectIndex=-1)
 Assign a zoom stack.
uint zoomRectIndex () const
virtual void setSelectionFlags (int)

Métodos protegidos

virtual void rescale ()
virtual QwtDoubleSize minZoomSize () const
 Limit zooming by a minimum rectangle.
virtual void widgetMouseReleaseEvent (QMouseEvent *)
virtual void widgetKeyPressEvent (QKeyEvent *)
virtual void begin ()
virtual bool end (bool ok=true)
virtual bool accept (QwtPolygon &) const
 Check and correct a selected rectangle.

Descripción detallada

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.

Nota:
The realtime example includes an derived zoomer class that adds scrollbars to the plot canvas.

Documentación del constructor y destructor

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 selectionFlags() are set to QwtPicker::RectSelection & QwtPicker::ClickSelection, the tracker mode to QwtPicker::ActiveOnly.

Parámetros:
canvasPlot canvas to observe, also the parent object
doReplotCall 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.
Ver también:
QwtPlot::autoReplot(), QwtPlot::replot(), setZoomBase()
QwtPlotZoomer::QwtPlotZoomer ( int  xAxis,
int  yAxis,
QwtPlotCanvas canvas,
bool  doReplot = true 
) [explicit]

Create a zoomer for a plot canvas.

The selectionFlags() are set to QwtPicker::RectSelection & QwtPicker::ClickSelection, the tracker mode to QwtPicker::ActiveOnly.

Parámetros:
xAxisX axis of the zoomer
yAxisY axis of the zoomer
canvasPlot canvas to observe, also the parent object
doReplotCall 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.
Ver también:
QwtPlot::autoReplot(), QwtPlot::replot(), setZoomBase()
QwtPlotZoomer::QwtPlotZoomer ( int  xAxis,
int  yAxis,
int  selectionFlags,
DisplayMode  trackerMode,
QwtPlotCanvas canvas,
bool  doReplot = true 
) [explicit]

Create a zoomer for a plot canvas.

Parámetros:
xAxisX axis of the zoomer
yAxisY axis of the zoomer
selectionFlagsOr'd value of QwtPicker::RectSelectionType and QwtPicker::SelectionMode. QwtPicker::RectSelection will be auto added.
trackerModeTracker mode
canvasPlot canvas to observe, also the parent object
doReplotCall 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.
Ver también:
QwtPicker, QwtPicker::setSelectionFlags(), QwtPicker::setRubberBand(), QwtPicker::setTrackerMode
QwtPlot::autoReplot(), QwtPlot::replot(), setZoomBase()
QwtPlotZoomer::~QwtPlotZoomer ( ) [virtual]

Documentación de las funciones miembro

bool QwtPlotZoomer::accept ( QwtPolygon 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.

Devuelve:
true If rect is accepted, or has been changed to a accepted rectangle.

Reimplementado de QwtPicker.

void QwtPlotZoomer::begin ( ) [protected, virtual]

Rejects selections, when the stack depth is too deep, or the zoomed rectangle is minZoomSize().

Ver también:
minZoomSize(), maxStackDepth()

Reimplementado de QwtPicker.

bool QwtPlotZoomer::end ( bool  ok = true) [protected, virtual]

Expand the selected rectangle to minZoomSize() and zoom in if accepted.

Ver también:
QwtPlotZoomer::accept()a, QwtPlotZoomer::minZoomSize()

Reimplementado de QwtPlotPicker.

int QwtPlotZoomer::maxStackDepth ( ) const
Devuelve:
Maximal depth of the zoom stack.
Ver también:
setMaxStackDepth()
QwtDoubleSize QwtPlotZoomer::minZoomSize ( ) const [protected, virtual]

Limit zooming by a minimum rectangle.

Devuelve:
zoomBase().width() / 10e4, zoomBase().height() / 10e4
void QwtPlotZoomer::move ( double  x,
double  y 
) [virtual, slot]

Move the the current zoom rectangle.

Parámetros:
xX value
yY value
Ver también:
QwtDoubleRect::move
Nota:
The changed rectangle is limited by the zoom base
void QwtPlotZoomer::moveBy ( double  dx,
double  dy 
) [slot]

Move the current zoom rectangle.

Parámetros:
dxX offset
dyY offset
Nota:
The changed rectangle is limited by the zoom base
void QwtPlotZoomer::rescale ( ) [protected, virtual]

Adjust the observed plot to zoomRect()

Nota:
Initiates QwtPlot::replot
void QwtPlotZoomer::setAxis ( int  xAxis,
int  yAxis 
) [virtual]

Reinitialize the axes, and set the zoom base to their scales.

Parámetros:
xAxisX axis
yAxisY axis

Reimplementado de QwtPlotPicker.

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.

Parámetros:
depthMaximum for the stack depth
Ver también:
maxStackDepth()
Nota:
depth doesn't include the zoom base, so zoomStack().count() might be maxStackDepth() + 1.
void QwtPlotZoomer::setSelectionFlags ( int  flags) [virtual]

Set the selection flags

Parámetros:
flagsOr'd value of QwtPicker::RectSelectionType and QwtPicker::SelectionMode. The default value is QwtPicker::RectSelection & QwtPicker::ClickSelection.
Ver también:
selectionFlags(), SelectionType, RectSelectionType, SelectionMode
Nota:
QwtPicker::RectSelection will be auto added.

Reimplementado de QwtPicker.

void QwtPlotZoomer::setZoomBase ( bool  doReplot = true) [virtual]

Reinitialized the zoom stack with scaleRect() as base.

Parámetros:
doReplotCall 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.
Ver también:
zoomBase(), scaleRect() QwtPlot::autoReplot(), QwtPlot::replot().
void QwtPlotZoomer::setZoomBase ( const QwtDoubleRect 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().

Parámetros:
baseZoom base
Ver también:
zoomBase(), scaleRect()
void QwtPlotZoomer::setZoomStack ( const QValueStack< QwtDoubleRect > &  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.

Parámetros:
zoomStackNew zoom stack
zoomRectIndexIndex of the current position of zoom stack. In case of -1 the current position is at the top of the stack.
Nota:
The zoomed signal might be emitted.
Ver también:
zoomStack(), zoomRectIndex()
void QwtPlotZoomer::widgetKeyPressEvent ( QKeyEvent ke) [protected, virtual]

Qt::Key_Plus zooms out, Qt::Key_Minus zooms in 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.

Nota:
The keys codes can be changed, using QwtEventPattern::setKeyPattern: 3, 4, 5

Reimplementado de QwtPicker.

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.

Nota:
The mouse events can be changed, using QwtEventPattern::setMousePattern: 2, 1

Reimplementado de QwtPicker.

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.

Parámetros:
offsetOffset relative to the current position of the zoom stack.
Nota:
The zoomed signal is emitted.
Ver también:
zoomRectIndex()
void QwtPlotZoomer::zoom ( const QwtDoubleRect rect) [virtual, slot]

Zoom in.

Clears all rectangles above the current position of the zoom stack and pushs the intersection of zoomRect() and the normalized rect on it.

Nota:
If the maximal stack depth is reached, zoom is ignored.
The zoomed signal is emitted.
QwtDoubleRect QwtPlotZoomer::zoomBase ( ) const
Devuelve:
Initial rectangle of the zoomer
Ver también:
setZoomBase(), zoomRect()
void QwtPlotZoomer::zoomed ( const QwtDoubleRect rect) [signal]

A signal emitting the zoomRect(), when the plot has been zoomed in or out.

Parámetros:
rectCurrent zoom rectangle.
QwtDoubleRect QwtPlotZoomer::zoomRect ( ) const

Rectangle at the current position on the zoom stack.

Ver también:
zoomRectIndex(), scaleRect().
uint QwtPlotZoomer::zoomRectIndex ( ) const
Devuelve:
Index of current position of zoom stack.
const QwtZoomStack & QwtPlotZoomer::zoomStack ( ) const

Return the zoom stack. zoomStack()[0] is the zoom base, zoomStack()[1] the first zoomed rectangle.

Ver también:
setZoomStack(), zoomRectIndex()

La documentación para esta clase fue generada a partir de los siguientes ficheros:
 Todo Clases Namespaces Archivos Funciones Variables 'typedefs' Enumeraciones Valores de enumeraciones Propiedades Amigas 'defines'