Solution failed

[AnLinkSoft]

polygon [(0.0, 0.0), (-2.136, -1.71), (1.273, -7.556), (2.713, -6.518)]
start (2.713, -6.518)
end (-2.136, -1.71)

[jannikmi]

Since the points you provide as start and end points are also vertices of the polygon, the output is undefined.
It is unclear if polygon vertex lies outside or inside of a polygon and hence also weather a path from one to the other should be possible.
Does that help? Feel free to reopen the issue.

[AnLinkSoft]

So can we assume that these points are inside the polygon?
Else we can't get a solution for that situation.

[jannikmi]

Good idea. I am not sure any more if there were any reasons for me not to implement it in this way in the first place.
Feel free to create a merge request addressing #35