Hello,
I took the example painting programme called basicdrawing that comes with Qt 4.5,
I simplified it and adapted it to draw QPolygons. I also added
painter.scale(4.0,4.0) near the start of the
void RenderArea:: paintEvent(QPaintEvent * /* event */)
definition.
Now the funny thing is that my polygons all have one corner with little whiskers.
Here is a screenshot:

It's on the leftmost corner.
Is this intentional?
Henri