Example of edge styles support.
| Attributes | Desriptions |
|---|---|
| label | Text displayed on the edge |
| color | Edge color |
| style | Edge style ("solid", "dashed", "dotted") |
| dir | Arrow direction ("forward", "both", "back", "none"), default is "forward" |
| arrowhead, arrowtail | Arrow style ("dot", "box", "crow", "curve", "icurve", "normal", "inv", "diamond", "tee", "vee") |
| width or penwidth | Edge width |