[Qt-interest] QRegion with rounded rect

[Samuel Rødal]

Andre Haupt wrote:
> Hi all,
> 
> Maybe i don't see the wood for the trees, but can somebody give me a hint,
> how to construct a QRegion with a shape of a rounded rectangle?
> 
> regards,
> 
> Andre

I'm not sure why you would want to do this, but one way would be to use 
QPainterPath::addRoundedRect, then QPainterPath::toFillPolygon, and 
finally the QRegion constructor that takes a polygon.

Something like this:

QPainterPath path;
path.addRoundedRect(QRectF(0, 0, 10, 10), 2, 2);

QRegion region(path.toFillPolygon().toPolygon());

Though in most cases you'd prefer to use the original path instead of 
the resulting region as you'd then get nice antialiased edges.

Regards,

Samuel