Problem understanding QPainter::setWindow (maybe)

[wysota]

If the drawing is cut then your call to setViewport() is apparently invalid.

However if you want to do rotations then I doubt setWindow is a good solution. It's easier to just translate the painter.

void X::paintEvent(QPaintEvent *) {
  QPainter p(this);
  p.translate(width()/2, height()/2);
  p.drawEllipse(-50, -50, 100, 100);
}

void X::paintEvent(QPaintEvent *) {
  QPainter p(this);
  p.translate(width()/2, height()/2);
  p.drawEllipse(-50, -50, 100, 100);
}

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