convexe polygon around a shape

[jacques_duflos]

thanks for the advice. Lists with python are a nightmare for me.

another surely optimisable part of my script is when I triple the elements of the convex hull to the points and their two tangents. And then I flatten the list with a line of code I copied without understanding it from this page. Is there a more pythonic way of doing so ?

Code:

    hull = [[i,i,i] for i in hull]
   hull = [item for sublist in hull for item in sublist]

Another curiosity in my script is the line I delete doubles. I use the line found in this page, but is it not over-engineer to use dictionaries for such a common task ?

Code:

    listOfPointsTupple = list(dict.fromkeys(listOfPointsTupple))