[Qt-interest] show the needle of the compass

[Matthias Pospiech]

Stefanos Antaris schrieb:
> 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.
It took a look into the code of the dials example and there all needles 
are created using setNeedle

compass->setNeedle(new QwtDialSimpleNeedle(QwtDialSimpleNeedle::Ray,
                false, Qt::white));

Looking into the docs of QwtDialSimpleNeedle 
(http://qwt.sourceforge.net/class_qwt_dial_simple_needle.html) I find a 
member function setWidth.
That is probably what you need.

Not tested though,
Matthias