[Qt-interest] show the needle of the compass

[Murphy, Sean M.]

> Matthias Pospiech wrote:
> > Stefanos Antaris schrieb:
> >> Hello.I try to make a compass.I didn't manage to install the qwt
> >> libraries on my Mac so i just took all the header files and the cpp
> >> files and i put them into my qt application.So i have made a
> >> QwtCompass and i can't show the needle of the compass.Can anyone
> help
> >> me?I have made an QwtCompass object but i don't know what do i have
> >> to do next.Moreover can i change the needle size?
> >>
> > As far as I understand you, you have enabled qwt by included the
> whole
> > code in your application and you do not need
> > to integrate the libary. Then everything which qwt allows should
> work.
> > If you want to change the apperiance, have you looked into the dials
> > example and looked into the documentation of the used classes?
> >
> > I have not looked into the code, but the documentation has function
> > like this one:
> >
> > void QwtDialSimpleNeedle::drawArrowNeedle      (
> >        QPainter *        painter,
> >        const QPalette &      palette,
> >        QPalette::ColorGroup      colorGroup,
> >        const QPoint &      center,
> >        int      length,
> >        int      width,
> >        double      direction,
> >        bool      hasKnob        )
> >
> > hope that helps.
> >
> > Matthias
> >
> I tried to install the qwt libraries on my Mac and i didn't manage
> it.So
> i took the code of qwt and i put it into my qt application in order to
> use it.Ok.I found this function too.But i don't know which parameteres
> should i pass.Which painter,palette,etc.This is my problem.

As I said in an earlier email, I'd really suggest you figure out why you
had trouble getting Qwt to work on your Mac in the first place, instead
of trying to paste Qwt code into your code, and then trying to figure
out why your hacked together version isn't working correctly.  Qwt DOES
work on a Mac, I have it working on my Mac, and is usually works out of
the box, once you properly bundle the Qwt libraries into your
application bundle.

Sean