[Feature request] defining a Circle() from 3 points about scikit-spatial HOT 12 CLOSED

Update: I have a working rough draft of the code to compute a circle from three points.

I'll add the class method Circle.from_points which takes three points as inputs and returns a Circle object.

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Yeah I think that would be a good fit in this library. I'll work on it sometime soon.

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ehm, thank you. didn't refresh... please read the edit, and thanks a lot!

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Hi @typhoon71!
After you edited your own question, it's not clear to me if you still want a classmethod to compute a circle from three points or something else. Can you provide further details, please? Thanks!

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My case:
I'm given the 2 end-points of a segment, and the value of the sagitta (which basically gives me a third point).
I need to get the circle passing by those 3 points.

• in my original request I was thinking of calculating that third point myself, and just ask for a classmethod to compute a circle from three points
• then I started to think to use the sagitta value

So I'm actually asking 2 class method.

I have segments lenghts around 50 to 200, and sagitta values from .5 to 5.

(I'm currently experiencing some issues with what I found online and I'm trying to understand if the cause is related to rounding or is just a mistake of mine; I may ask for help about this later, in another post)

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Thank you, awesome news.

I really want to test this new method because when I try to do it with what I got... the circle I get does not pass from the 3 starting points - there's a really small distance, but it's there.

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Update: I have a working rough draft of the code to compute a circle from three points.

I'll add the class method Circle.from_points which takes three points as inputs and returns a Circle object.

Hi @ajhynes7, great! Thanks!

@typhoon71 Two points and the sagitta value are the inputs required to define a circular arc. So, maybe, we could define a from_arc classmethod that requires two points and a float.
@ajhynes7 Do you think this classmethod could be a valuable addition to the library?

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Will from_arc still be needed after adding from_points?

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from_arc would be easier to use when you don't have the 3 points, but 2 points the arc sagitta (my case).
I guess it would be a particular case.

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Are you able to solve your problem with Circle.from_points? It's available now in the new release.

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I just tested Circle.from_points (thank you), and while it works fine it doesn't solve my issue.

I'm pretty sure (after some investigation) that what I'm experiencing is floating point rounding/precision - and that doesn't go well with the stuff I'm doing (geometry).

If you are interested I can open a post about it - hopefully some better mind can give me a good push in the right direction.

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Yeah I think opening a new issue would be appropriate here.

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