Can Glyphs draw a standard circle?
there is a circle tool in the tool bar on the top. press the button of the rectangle tool longer to reveal it
Just out of curiosity.
Can it theoretically achieve an absolute standard?
You can learn more about the Rectangle and Circle tools in the Handbook:
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Strangely, after the two circles are aligned in the center, the four nodes are not on a straight line.
How did you align the two circles? If they have the same center, then the nodes are on a straight line.
It is just the coordinate rounding on the grid when the circle’s width/height is not an even number. When that is visible (usually in narrow styles or small circles) these scrips can help a bit to distribute or align the nodes quickly.
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note that if the radius of the circle measured in grid units is uneven, the top and bottom extreme nodes cant be centered exactly between the left and right extreme nodes thus the circle is minimally oval
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Just to really nitpick: no, mathematically speaking, you cannot describe a perfect circle with Bézier curves. It’s possible to approximate it very closely, which will definitely suffice for your intended applications.
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Out of curiosity, what is a standard circle? And what is a non-standard circle?
If you round coordinates, there will always have to be a certain amount of distortion. Differences of 1u can safely be ignored in the very most contexts in type design.
If you speak about a mathematically perfect circle, I can point you to math literature that explains the issue.
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