10 #ifndef QWT_VECTOR_FIELD_SYMBOL_H 
   11 #define QWT_VECTOR_FIELD_SYMBOL_H 
   13 #include "qwt_global.h" 
   51     virtual void paint( QPainter* ) 
const = 0;
 
   67     virtual void setLength( qreal length ) QWT_OVERRIDE;
 
   68     virtual qreal length() 
const QWT_OVERRIDE;
 
   70     virtual void paint( QPainter* ) 
const QWT_OVERRIDE;
 
   87     virtual void setLength( qreal length ) QWT_OVERRIDE;
 
   88     virtual qreal length() 
const QWT_OVERRIDE;
 
   90     virtual void paint( QPainter* ) 
const QWT_OVERRIDE;
 
virtual qreal length() const =0
virtual void paint(QPainter *) const =0
Draw the symbol/arrow.
virtual void setLength(qreal length)=0