As easy as it is in Rhino to create this with tangent snap, I can’t find any grasshopper component capable of doing this, i.e. drawing a tangent line to a curve from a given point.
Thank you, I know this component, which works fine with circles indeed! But tangent with bezier curve for example?
Oh, ok, now I see no circle… stupid me 
this could be a starting point
https://developer.rhino3d.com/api/RhinoCommon/html/M_Rhino_Geometry_Curve_GetLocalTangentPoint_1.htm
Point_Curve_Tangent.gh (6.7 KB)
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This is more than a starting point, it works for my use, thanks!
I had just started looking in rhinocommon, but as I’m not an expert, I may take a while.
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That script works great. Much better than my solution with Galapagos.
Actually I’m surprised there isn’t a Grasshopper component for this.
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Sure!