Florian Dahlitz <f.dahl...@outlook.de> added the comment:
I tested it and can confirm the findings from @cajetan.rodrigues. However, this
does not seem to be _not_ documented. The documentation clearly states that
using a positive value for radius results in a counter-clockwise direction,
whereas a negative number results in a clockwise direction. This is true.
Now, let's have a look at using radius _together_ with extent, which is not
(clearly) documented as this point. Using a positive value results in the same
direction, but in a not full drawn circle. This seems intuitive and is
documented:
If extent is not given, draw the entire circle.
If extent is not a full circle, one endpoint of the arc is the current pen
position.
Using a negative value changes the direction of radius, which does also seem
reasonable and intuitive.
My suggestion is not to replace "radius" by "extent" as suggested by @guchao as
it is IMHO wrong. But I agree that it would be good to leave a note there or to
add examples demonstrating the behaviour of different (signed) values of radius
and extent, so the intent and behaviour is clearly documented.
----------
nosy: +DahlitzFlorian
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<https://bugs.python.org/issue40283>
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