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




#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]


length of the symbol/arrow

See also


Implemented in QwtVectorFieldThinArrow, and QwtVectorFieldArrow.

virtual void QwtVectorFieldSymbol::setLength (qreal length) [pure virtual]

Set the length of the symbol/arrow

See also


Implemented in QwtVectorFieldThinArrow, and QwtVectorFieldArrow.


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Sun Jul 18 2021 Version 6.2.0