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

NAME
       QwtVectorFieldSymbol

SYNOPSIS
       #include <qwt_vectorfield_symbol.h>

       Inherited by QwtVectorFieldArrow, and QwtVectorFieldThinArrow.

   Public Member Functions
       QwtVectorFieldSymbol ()
           Constructor.
       virtual ~QwtVectorFieldSymbol ()
           Destructor.
       virtual void setLength (qreal length)=0
       virtual qreal length () const =0
       virtual void paint (QPainter *) const =0
           Draw the symbol/arrow.

Detailed Description
       Defines abstract interface for arrow drawing routines.

       Arrow needs to be drawn horizontally with arrow tip at coordinate 0,0.
       arrowLength() shall return the entire length of the arrow (needed to
       translate the arrow for tail/centered alignment). setArrowLength()
       defines arror length in pixels (screen coordinates). It can be
       implemented to adjust other geometric properties such as the head size
       and width of the arrow. It is always called before paint().

       A new arrow implementation can be set with
       QwtPlotVectorField::setArrowSymbol(), whereby ownership is transferred
       to the plot field.

       Definition at line 32 of file qwt_vectorfield_symbol.h.

Member Function Documentation
   virtual qreal QwtVectorFieldSymbol::length () const [pure virtual]
       Returns
           length of the symbol/arrow

       See also
           setLength()

       Implemented in QwtVectorFieldThinArrow, and QwtVectorFieldArrow.

   virtual void QwtVectorFieldSymbol::setLength (qreal length) [pure virtual]
       Set the length of the symbol/arrow

       See also
           length()

       Implemented in QwtVectorFieldThinArrow, and QwtVectorFieldArrow.


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

Version 6.2.0                   Sun Jul 18 2021        QwtVectorFieldSymbol(3)