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shape size doesn't stay fixed

New Here ,
May 12, 2020

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apparently when I rotate a circle of 10cm under an angle of 72° the circle changes size (9,998cm instead of 10) ? what's the solutin to this problem ?
this little change becomes a problem when making everthing fit in a more complex design.
Tom

Adobe Community Professional
Correct answer by Doug A Roberts | Adobe Community Professional

Circles created with the ellipse tool in Illustrator are made from bezier curves defines from four anchor points; these will always have some innaccuracy, bulging slightly with a peak at 22.5° back down to zero innaccuracy at 45° (a 10 cm ellipse seems to have about 0.0027 cm difference). Unfortunately a rotation of 72° is close enough to that point to show a difference at three decimal places (the peak would be 67.5°).

 

Bezier curves can create more accurate circles the more anchor points there are. The 'Circle' script here lets you create circles with any number of points:

 

https://shanfan.github.io/Illustrator-Scripts-Archive/

 

Out of interest, what are you creating that requires such a fine tolerance?

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shape size doesn't stay fixed

New Here ,
May 12, 2020

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apparently when I rotate a circle of 10cm under an angle of 72° the circle changes size (9,998cm instead of 10) ? what's the solutin to this problem ?
this little change becomes a problem when making everthing fit in a more complex design.
Tom

Adobe Community Professional
Correct answer by Doug A Roberts | Adobe Community Professional

Circles created with the ellipse tool in Illustrator are made from bezier curves defines from four anchor points; these will always have some innaccuracy, bulging slightly with a peak at 22.5° back down to zero innaccuracy at 45° (a 10 cm ellipse seems to have about 0.0027 cm difference). Unfortunately a rotation of 72° is close enough to that point to show a difference at three decimal places (the peak would be 67.5°).

 

Bezier curves can create more accurate circles the more anchor points there are. The 'Circle' script here lets you create circles with any number of points:

 

https://shanfan.github.io/Illustrator-Scripts-Archive/

 

Out of interest, what are you creating that requires such a fine tolerance?

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Draw and design, How to

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May 12, 2020 0
Adobe Community Professional ,
May 12, 2020

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Circles created with the ellipse tool in Illustrator are made from bezier curves defines from four anchor points; these will always have some innaccuracy, bulging slightly with a peak at 22.5° back down to zero innaccuracy at 45° (a 10 cm ellipse seems to have about 0.0027 cm difference). Unfortunately a rotation of 72° is close enough to that point to show a difference at three decimal places (the peak would be 67.5°).

 

Bezier curves can create more accurate circles the more anchor points there are. The 'Circle' script here lets you create circles with any number of points:

 

https://shanfan.github.io/Illustrator-Scripts-Archive/

 

Out of interest, what are you creating that requires such a fine tolerance?

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New Here ,
May 12, 2020

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thanks you for the feedback. I'm a logodesigner and working a lot with sacred geomety as base for the grid, therefor it's importand to have as accurate as possible.
here is a simple example which I can't get perfect in illustrator (24.1.2)
no matter what shape (circle, pentagon, ...) or line (radius) I start from. 

Pent-e1577249989593.png

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May 12, 2020 0
Adobe Community Professional ,
May 12, 2020

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I would certainly give the Circle script that Doug mentioned a try.

Use it with 10 anchors to build your example.

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New Here ,
May 13, 2020

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super, thanks. will give it a shot !

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May 13, 2020 0
Adobe Community Professional ,
May 12, 2020

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Which version of Illustrator?

The 24.1.2 makes it 10,0027 cm after rotation, but the Ellipse properties in the Transform panel are unchanged.

Do you think you can see the difference?

 

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New Here ,
May 12, 2020

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the latest one 24.1.2

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