How to do this using QPainter?

qwe3

Hi,

I have widget filled by green color. Next I draw red ellipse. And I would like to draw transparent rectangle on the ellipse to see green background like this:

I know that I can use QPainterPath to draw what I want: using arc, lines etc.

But maybe there is a simple solution to use only something like:

painter->drawRext(100,100,10,10, Qt::transparent);

EDIT

Of course I know that i can draw green rectangle, but a green background is only example.

mpergand

Hi,

You can substract two paths:

       int radius=100;
       QPainterPath path;
       path.addEllipse(rect().center(),radius,radius);
       QPainterPath recPath;
       int recW=radius/2;
       QRectF rec=path.boundingRect();
       rec.setSize(QSize(recW,recW));
       rec.translate(0,radius-recW/2);
       recPath.addRect(rec);
       path=path.subtracted(recPath);   // substract rect from ellipse
       
       painter.fillPath(path,Qt::red);