'QGraphicsScene draw a non transformable circle

I am trying to draw a 10 pixel radius circle on a QGraphicsScene that is anchored on the center and doesn't transform (change size) when the scene is zoomed.

I have tried using the QGraphicsEllipseItem with the QGraphicsItem::ItemIgnoresTransformations flag, but it still transforms when the scene is zoomed.

Is this possible with standard graphics items, or do I need to create my own and do the paint event manually?

qtqt5


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