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Adding (perfect) circle shape, radius invariant to rotation.


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Hi,

 

there are several complaints about circle made from ellipse not being perfect, meaning the radius will differ slightly depending on rotation angle. Most obvious if you look at 45° angle.

For reference, one of the latest bug reports:

https://forum.affinity.serif.com/index.php?/topic/148430-power-duplicate-around-circle-not-precise-what-am-i-missing/&tab=comments#comment-840218

This could easily solved by adding one additional shape: a circle, made of 12 nodes instead of only 4. The "real" circle will be almost rotation invariant.

Almost means that in all tests using up to 256.000^2 pixel canvas size the deviation of radius while rotating this circle was smaller than 1 pixel.

The regular ellipse based circle causes a deviation of up to 12,7px at 65536 px canvas, or 1/5000 or 0,2 *10^-3

 

Edited by NotMyFault

Mac mini M1 A2348

LG34WK950U-W, calibrated to DCI-P3 with LG Calibration Studio / Spider 5

iPad Air Gen 5 (2022) A2589

Special interest into procedural texture filter, edit alpha channel, RGB/16 and RGB/32 color formats, stacking, finding root causes for misbehaving files, finding creative solutions for unsolvable tasks, finding bugs in Apps.

 

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  • 4 weeks later...

I don't see a question in your post, but this would make a good Feature Request. Seems like an elegant solution that might involve a lot less work than revising the math of the ellipse tool.

-- Walt

Desktop:  Windows 11 Home, version 21H2 (22000.613) 64GB memory, AMD Ryzen 9 5900 12-Core @ 3.00 GHz, NVIDIA GeForce RTX 3090 
Laptop:  Windows 10 Home, version 21H2 (19044.1706) 32GB memory, Intel Core i7-10750H @ 2.60GHz, Intel UHD Graphics Comet Lake GT2 and NVIDIA GeForce RTX 3070 Laptop GPU.
        Affinity Photo 1.10.6 (.1665) and 2.0..3  and 2.0.3.1670 beta/ Affinity Designer 1.10.6 (.1665)  and 2.0.3 and 2.0.3.1670 beta / Affinity Publisher 1.10.6 (.1665)  and 2.0.3 and 2.0.3.1670 beta
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      Affinity Photo 1.10.6 and 2.0.3 / Affinity Designer 1.10.6 and 2.0.3 / Affinity Publisher 2.0.3

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Yeah, the ellipse tool can stay with its imperfections - it is intentionally not called a circle tool.

Simply adding a new circle tools (based on 12 instead of 4 nodes) will solve the problem several users raised.

Mac mini M1 A2348

LG34WK950U-W, calibrated to DCI-P3 with LG Calibration Studio / Spider 5

iPad Air Gen 5 (2022) A2589

Special interest into procedural texture filter, edit alpha channel, RGB/16 and RGB/32 color formats, stacking, finding root causes for misbehaving files, finding creative solutions for unsolvable tasks, finding bugs in Apps.

 

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  • 3 months later...

I was able to get fairly accurate results with the Cloud tool, with 12 Bubbles. I checked the result with a star with 12 beams as @NotMyFault advised, as well as with 24 beams, and got a good result. Circle.afdesign

 

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