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       QwtPlotCanvas -

       Canvas of a QwtPlot.


       #include <qwt_plot_canvas.h>

   Public Types
       enum FocusIndicator { NoFocusIndicator, CanvasFocusIndicator, ItemFocusIndicator }
       enum PaintAttribute { PaintCached =  1, PaintPacked =  2 }

   Public Member Functions
       FocusIndicator focusIndicator () const
       void invalidatePaintCache ()
       QPixmap * paintCache ()
       const QPixmap * paintCache () const
       const QwtPlot * plot () const
       QwtPlot * plot ()
       QwtPlotCanvas (QwtPlot *)
       void replot ()
       void setFocusIndicator (FocusIndicator)
       void setPaintAttribute (PaintAttribute, bool on=true)
       bool testPaintAttribute (PaintAttribute) const
       virtual ~QwtPlotCanvas ()

   Protected Member Functions
       void drawCanvas (QPainter *painter=NULL)
       virtual void drawContents (QPainter *)
       virtual void drawFocusIndicator (QPainter *)
       virtual void hideEvent (QHideEvent *)
       virtual void paintEvent (QPaintEvent *)

Detailed Description

       Canvas of a QwtPlot.

       See also:

Member Enumeration Documentation

   enum QwtPlotCanvas::FocusIndicator
       Focus indicator. .IP "·" 2 NoFocusIndicator
        Don't paint a focus indicator

       · CanvasFocusIndicator
          The focus is related to the complete canvas. Paint the focus indicator using

       · ItemFocusIndicator
          The focus is related to an item (curve, point, ...) on the canvas. It is up to the
         application to display a focus indication using f.e. highlighting.

       See also:
           setFocusIndicator(), focusIndicator(), paintFocus()

   enum QwtPlotCanvas::PaintAttribute
       Paint attributes. .IP "·" 2 PaintCached
        Paint double buffered and reuse the content of the pixmap buffer for some spontaneous
       repaints that happen when a plot gets unhidden, deiconified or changes the focus.
       Disabling the cache will improve the performance for incremental paints (using

       · PaintPacked
          Suppress system background repaints and paint it together with the canvas contents.
         Painting packed might avoid flickering for expensive repaints, when there is a notable
         gap between painting the background and the plot contents.

       The default setting enables PaintCached and PaintPacked

       See also:
           setPaintAttribute(), testPaintAttribute(), paintCache()

Constructor & Destructor Documentation

   QwtPlotCanvas::QwtPlotCanvas (QwtPlot *plot) [explicit]
       Sets a cross cursor, enables QwtPlotCanvas::PaintCached.

   QwtPlotCanvas::~QwtPlotCanvas () [virtual]

Member Function Documentation

   void QwtPlotCanvas::drawCanvas (QPainter *painter = NULL) [protected] Draw the the canvas
       Paints all plot items to the contentsRect(), using QwtPlot::drawCanvas and updates the
       paint cache.

           painter Painter

       See also:
           QwtPlot::drawCanvas(), setPaintAttributes(), testPaintAttributes()

   void QwtPlotCanvas::drawContents (QPainter *painter) [protected, virtual] Redraw the canvas,
       and focus rect
           painter Painter

   void QwtPlotCanvas::drawFocusIndicator (QPainter *painter) [protected, virtual] Draw the focus
           painter Painter

   QwtPlotCanvas::FocusIndicator QwtPlotCanvas::focusIndicator () const Returns:
           Focus indicator

       See also:
           FocusIndicator, setFocusIndicator()

   void QwtPlotCanvas::hideEvent (QHideEvent *event) [protected, virtual] Hide event
           event Hide event

   void QwtPlotCanvas::invalidatePaintCache ()
       Invalidate the internal paint cache.

   const QPixmap * QwtPlotCanvas::paintCache () const
       Return the paint cache, might be null.

   QPixmap * QwtPlotCanvas::paintCache ()
       Return the paint cache, might be null.

   void QwtPlotCanvas::paintEvent (QPaintEvent *event) [protected, virtual] Paint event
           event Paint event

   const QwtPlot * QwtPlotCanvas::plot () const
       Return parent plot widget.

   QwtPlot * QwtPlotCanvas::plot ()
       Return parent plot widget.

   void QwtPlotCanvas::replot () Invalidate the paint cache and repaint the canvas
       See also:

   void QwtPlotCanvas::setFocusIndicator (FocusIndicatorfocusIndicator) Set the focus indicator
       See also:
           FocusIndicator, focusIndicator()

   void QwtPlotCanvas::setPaintAttribute (PaintAttributeattribute, boolon = true)
       Changing the paint attributes. Parameters:
           attribute Paint attribute
           on On/Off

       The default setting enables PaintCached and PaintPacked

       See also:
           testPaintAttribute(), drawCanvas(), drawContents(), paintCache()

   bool QwtPlotCanvas::testPaintAttribute (PaintAttributeattribute) const Test wether a paint
       attribute is enabled
           attribute Paint attribute

           true if the attribute is enabled

       See also:


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