Drawing and detecting an elliptical arc

@Bianchi wrote:

I’m interested in drawing elliptical arcs (i.e. parts of ellipses) in Rhino. Currently, I’ve tried splitting an ellipse into four parts (not necessarily into quadrants), like so:

However, upon checking the object type and using IsEllipse, IsArc in rhinoscriptsyntax, I get some unexpected results:

rs.IsEllipse: True
rs.IsArc: False

which means I can’t sense that it’s an arc, and that it still registers as an ellipse. What would be a surefire way to generate an elliptical arc that Rhino can sense, and how do I check if a curve geometry is an elliptical arc using RhinoPython / Rhinoscriptsyntax / Rhino common? Would I need to do some math bits first in order to check if it is elliptical?

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