For an edge T -> H;
| Direction | Image |
|---|---|
"forward" | |
"back" | |
"both" | |
"none" |
That is, a glyph is drawn at the head end of an edge if and only if dirType is "forward" or "both"; a glyph is drawn at the tail end of an edge if and only if dirType is "back" or "both";
For undirected edges T -- H;, one of the nodes, usually the righthand one, is treated as the head for the purpose of interpreting "forward" and "back".
dirType is a valid type for:
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Licensed under the Eclipse Public License 1.0.
https://www.graphviz.org/docs/attr-types/dirType/