Orient and align profiles to curve

Grasshopper
1

Hi all, I’m trying to align a profile (polygon) so that it stays tangent or aligned to one side of a curve that it intersects - I hope the images below illustrate what I’m trying to achieve - also attaching the definition. Thanks for any help!

gh
gh677×898 23.4 KB

gh2
gh21406×711 104 KB

2018_0520b.gh (25.4 KB)

2

Something like this?

Canvas%20at%2017%3B35%3B56
Canvas at 17;35;56.png1823×494 493 KB
2018_0520b_re.gh (28.2 KB)

3

Thank you HS_Kim - I’m looking through your solution to understand the logic - thanks very much!