Infinite (circular) QGraphics Scene

[wysota]

You don't have to render everything. You know which parts of the scene are visible (based on the scroll position) so you can request only those parts, stitch them together in one pixmap and render it to the view. You can even cache chunks of the final pixmap to avoid rerendering the parts you already have.

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Added after 5 minutes:

You can also completely ignore graphics view and use a custom architecture like I did here:

wrapping-map.png