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

NAME
       QwtPolarCanvas - Canvas of a QwtPolarPlot.


SYNOPSIS
       #include <qwt_polar_canvas.h>

       Inherits QFrame.

   Public Types
       enum PaintAttribute { BackingStore = 0x01 }
           Paint attributes.
       typedef QFlags< PaintAttribute > PaintAttributes

   Public Member Functions
       QwtPolarCanvas (QwtPolarPlot *)
           Constructor.
       virtual ~QwtPolarCanvas ()
           Destructor.
       QwtPolarPlot * plot ()
       const QwtPolarPlot * plot () const
       void setPaintAttribute (PaintAttribute, bool on=true)
           Changing the paint attributes.
       bool testPaintAttribute (PaintAttribute) const
       const QPixmap * backingStore () const
       void invalidateBackingStore ()
           Invalidate the internal backing store.
       QwtPointPolar invTransform (const QPoint &) const
       QPoint transform (const QwtPointPolar &) const

   Protected Member Functions
       virtual void paintEvent (QPaintEvent *) override
       virtual void resizeEvent (QResizeEvent *) override

Detailed Description
       Canvas of a QwtPolarPlot.

       The canvas is the widget, where all polar items are painted to.

       Note
           In opposite to QwtPlot all axes are painted on the canvas.

       See also
           QwtPolarPlot

       Definition at line 27 of file qwt_polar_canvas.h.

Member Typedef Documentation
   typedef QFlags<PaintAttribute > QwtPolarCanvas::PaintAttributes
       An ORed combination of PaintAttribute values.

       Definition at line 50 of file qwt_polar_canvas.h.

Member Enumeration Documentation
   enum QwtPolarCanvas::PaintAttribute
       Paint attributes. The default setting enables BackingStore

       See also
           setPaintAttribute(), testPaintAttribute(), backingStore()

       Enumerator

       BackingStore
              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.

       Definition at line 40 of file qwt_polar_canvas.h.

Member Function Documentation
   const QPixmap * QwtPolarCanvas::backingStore () const
       Returns
           Backing store, might be null

       Definition at line 170 of file qwt_polar_canvas.cpp.

   QwtPointPolar QwtPolarCanvas::invTransform (const QPoint & pos) const
       Translate a point from widget into plot coordinates

       Parameters
           pos Point in widget coordinates of the plot canvas

       Returns
           Point in plot coordinates

       See also
           transform()

       Definition at line 267 of file qwt_polar_canvas.cpp.

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

       Parameters
           event Paint event

       Definition at line 186 of file qwt_polar_canvas.cpp.

   QwtPolarPlot * QwtPolarCanvas::plot ()
       Returns
           Parent plot widget

       Definition at line 97 of file qwt_polar_canvas.cpp.

   const QwtPolarPlot * QwtPolarCanvas::plot () const
       Returns
           Parent plot widget

       Definition at line 103 of file qwt_polar_canvas.cpp.

   void QwtPolarCanvas::resizeEvent (QResizeEvent * event) [override],
       [protected],  [virtual]
       Resize event

       Parameters
           event Resize event

       Definition at line 251 of file qwt_polar_canvas.cpp.

   void QwtPolarCanvas::setPaintAttribute (PaintAttribute attribute, bool on =
       true)
       Changing the paint attributes.

       Parameters
           attribute Paint attribute
           on On/Off

       The default setting enables BackingStore

       See also
           testPaintAttribute(), paintCache()

       Definition at line 118 of file qwt_polar_canvas.cpp.

   bool QwtPolarCanvas::testPaintAttribute (PaintAttribute attribute) const
       Test whether a paint attribute is enabled

       Parameters
           attribute Paint attribute

       Returns
           true if the attribute is enabled

       See also
           setPaintAttribute()

       Definition at line 164 of file qwt_polar_canvas.cpp.

   QPoint QwtPolarCanvas::transform (const QwtPointPolar & polarPos) const
       Translate a point from plot into widget coordinates

       Parameters
           polarPos Point in plot coordinates

       Returns
           Point in widget coordinates

       See also
           transform()

       Definition at line 310 of file qwt_polar_canvas.cpp.


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

Version 6.2.0                   Sun Jul 18 2021              QwtPolarCanvas(3)