An indicator for the wind direction.  
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#include <qwt_dial_needle.h>
|  | 
|  | QwtCompassWindArrow (Style, const QColor &light=Qt::white, const QColor &dark=Qt::gray) | 
|  | 
|  | QwtDialNeedle () | 
|  | Constructor. 
 | 
|  | 
| virtual | ~QwtDialNeedle () | 
|  | Destructor. 
 | 
|  | 
| virtual void | setPalette (const QPalette &) | 
|  | 
| const QPalette & | palette () const | 
|  | 
| virtual void | draw (QPainter *painter, const QPointF ¢er, double length, double direction, QPalette::ColorGroup=QPalette::Active) const | 
|  | 
|  | 
| virtual void | drawNeedle (QPainter *, double length, QPalette::ColorGroup) const | 
|  | 
| virtual void | drawKnob (QPainter *, double width, const QBrush &, bool sunken) const | 
|  | Draw the knob. 
 | 
|  | 
An indicator for the wind direction. 
QwtCompassWindArrow shows the direction where the wind comes from.
- QPalette::Light
 Used for Style1, or the light half of Style2
- QPalette::Dark
 Used for the dark half of Style2
- See also
- QwtDial, QwtCompass 
Style of the arrow. 
| Enumerator | 
|---|
| Style1 | A needle pointing to the center.  | 
| Style2 | A needle pointing to the center.  | 
 
 
      
        
          | QwtCompassWindArrow::QwtCompassWindArrow | ( | Style | style, | 
        
          |  |  | const QColor & | light = Qt::white, | 
        
          |  |  | const QColor & | dark = Qt::gray | 
        
          |  | ) |  |  | 
      
 
Constructor
- Parameters
- 
  
    | style | Arrow style |  | light | Light color |  | dark | Dark color |  
 
 
 
  
  | 
        
          | void QwtCompassWindArrow::drawNeedle | ( | QPainter * | painter, |  
          |  |  | double | length, |  
          |  |  | QPalette::ColorGroup | colorGroup |  
          |  | ) |  | const |  | protectedvirtual | 
 
Draw the needle
- Parameters
- 
  
    | painter | Painter |  | length | Length of the needle |  | colorGroup | Color group, used for painting |  
 
Implements QwtDialNeedle.