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 *painter, 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

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

   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.

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

       Parameters:
           palette New Palette

Author

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