Class Hierarchy Graphs

[w0rp via Digitalmars-d]

In an attempt to get something, anything, easier to read, I wrote 
another function which produces a graph where the module nodes 
are ranked by their incoming edge counts. The only way I could 
figure out how to get Graphviz to do this was to write the 
numbers as edges too and so on. So it looks like this.

https://i.imgur.com/jPGdPRm.png

I don't know why Graphviz decides that the distance between the 
ranks and the proper graph must be so huge. There's probably a 
way to write the two as subgraphs, and then set the distance 
between them to be small. I used the othorgonal lines for this 
one. Maybe some node and edge colouring would make the lines 
easier to follow, but generally as more things import each other 
the graph will tend to look messier.