QwtPlotCanvas(3)	       Qwt User's Guide		      QwtPlotCanvas(3)

NAME
       QwtPlotCanvas -

SYNOPSIS
       #include <qwt_plot_canvas.h>

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

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

   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:
	   QwtPlot

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 paintFocus()

       · 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 QwtPlotCurve::draw).

       · 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()

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.

       Parameters:
	   painter Painter

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

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

       Parameters:
	   painter Painter

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

       Parameters:
	   painter Painter

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

       See also:
	   FocusIndicator, setFocusIndicator()

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

       Parameters:
	   event Hide event

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

       Parameters:
	   event Paint event

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

       See also:
	   invalidatePaintCache()

   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

       Parameters:
	   attribute Paint attribute

       Returns:
	   true if the attribute is enabled

       See also:
	   setPaintAttribute()

Author
       Generated automatically by Doxygen for Qwt User's Guide from the source
       code.

Version 5.2.3			Tue Nov 20 2012		      QwtPlotCanvas(3)

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