Positions where the boolean array mask
is False
are considered as not containing data.
Iterate across the given array in a marching-squares fashion, looking for segments that cross 'level'. If such a segment is found, its coordinates are added to a growing list of segments, which is returned by the function. if vertex_connect_high is nonzero, high-values pixels are considered to be face+vertex connected into objects; otherwise low-valued pixels are.
Hover to see nodes names; edges to Self not shown, Caped at 50 nodes.
Using a canvas is more power efficient and can get hundred of nodes ; but does not allow hyperlinks; , arrows or text (beyond on hover)
SVG is more flexible but power hungry; and does not scale well to 50 + nodes.
All aboves nodes referred to, (or are referred from) current nodes; Edges from Self to other have been omitted (or all nodes would be connected to the central node "self" which is not useful). Nodes are colored by the library they belong to, and scaled with the number of references pointing them
