Further posibble development, improvings:
the algoritm could beimproved to work even if the polyline's and/or polygone's angles are more than 90°
After eliminating all the lines, polylines and polygones from the image, it might be easy to identify the circles and create vectors from them.
The curves from the image could be vectorise, although curves are considerably harder to work with.
Create a nice commercial aspect to the program: Graphical User Interface.
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