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

NAME
       QwtDialNeedle - Base class for needles that can be used in a QwtDial.


SYNOPSIS
       #include <qwt_dial_needle.h>

       Inherited by QwtCompassMagnetNeedle, QwtCompassWindArrow, and
       QwtDialSimpleNeedle.

   Public Member Functions
       QwtDialNeedle ()
           Constructor.
       virtual ~QwtDialNeedle ()
           Destructor.
       virtual void setPalette (const QPalette &)
       const QPalette & palette () const
       virtual void draw (QPainter *, const QPointF &center, double length,
           double direction, QPalette::ColorGroup=QPalette::Active) const

   Protected Member Functions
       virtual void drawNeedle (QPainter *painter, double length,
           QPalette::ColorGroup colorGroup) const =0
           Draw the needle.
       virtual void drawKnob (QPainter *, double width, const QBrush &, bool
           sunken) const
           Draw the knob.

Detailed Description
       Base class for needles that can be used in a QwtDial.

       QwtDialNeedle is a pointer that indicates a value by pointing to a
       specific direction.

       See also
           QwtDial, QwtCompass

       Definition at line 27 of file qwt_dial_needle.h.

Member Function Documentation
   void QwtDialNeedle::draw (QPainter * painter, const QPointF & center,
       double length, double direction, QPalette::ColorGroup colorGroup =
       QPalette::Active) const [virtual]
       Draw the needle

       Parameters
           painter Painter
           center Center of the dial, start position for the needle
           length Length of the needle
           direction Direction of the needle, in degrees counter clockwise
           colorGroup Color group, used for painting

       Definition at line 219 of file qwt_dial_needle.cpp.

   virtual void QwtDialNeedle::drawNeedle (QPainter * painter, double length,
       QPalette::ColorGroup colorGroup) const [protected],  [pure virtual]
       Draw the needle. The origin of the needle is at position (0.0, 0.0 )
       pointing in direction 0.0 ( = east ).

       The painter is already initialized with translation and rotation.

       Parameters
           painter Painter
           length Length of the needle
           colorGroup Color group, used for painting

       See also
           setPalette(), palette()

       Implemented in QwtCompassWindArrow, QwtCompassMagnetNeedle, and
       QwtDialSimpleNeedle.

   const QPalette & QwtDialNeedle::palette () const
       Returns
           the palette of the needle.

       Definition at line 205 of file qwt_dial_needle.cpp.

   void QwtDialNeedle::setPalette (const QPalette & palette) [virtual]
       Sets the palette for the needle.

       Parameters
           palette New Palette

       Definition at line 197 of file qwt_dial_needle.cpp.


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

Version 6.2.0                   Sun Jul 18 2021               QwtDialNeedle(3)