https://forum.qt.io/topic/25103/can-t-get-qpainter-to-draw-a-simple-triangle
Can't get QPainter to draw a simple triangle | Qt Forum
Apr 13, 2013 - I can't get QPainter to draw a simple triangle. The example below shows the side marked red doesn't line up at either end. You will need to zoom to see clear...
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https://doc.qt.io/qt-6/qpainter.html
QPainter Class | Qt GUI | Qt 6.11.1
The QPainter class performs low-level painting on widgets and other paint devices.
classqtgui
https://www.pythonguis.com/topics/qpainter/
qpainter | Create GUI applications with Python and Qt by Python GUIs
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