why I can't get a perfect circle by defining the corner radius of a box as half of its width?

oat

May I ask why i can't get a perfect circle using the following code? Does this mean the "radius" of the corner is not strictly the radius of a circle? If that's the case, then what's this "radius" referring to?

background(0);
rectMode(CENTER);
rect(50,50, 100,100, 50);

bilmor

In an early reply to http://forum.processing.org/two/discussion/1941 REAS says that it's probably a Processing issue, but I don't see a report in GitHub.

oat

Thanks a lot, bilmor! looks like there's quite a lot to learn from that post. :))