Graphics Reference
In-Depth Information
Figure 16-1:
Draw links over the top of nodes only when the links belong
to a highlighted subgraph, and the nodes do not. In this flight delays
example, routes in and out of Houston are highlighted in the context of the
full network of airports.
Tip
Links should be drawn in a layer under nodes, except when they are
part of a highlighted subgraph, in which case they should be drawn
above nodes that are not highlighted.
Node Shape
Virtually all graph visualization tools support some choice of shape. Circles
are used far more than any other option. Of the abstract shapes, circles
centered on the node coordinate are the perfect choice. Knowing the radius
of each node, links drawn to that same distance from each coordinate can be
guaranteed to end at the edge of the node at perfect right angles.
Circles form an ideal relationship withtheir links, whichhelpswhenvisually
deciphering which links and nodes are connected. This is especially helpful
in a more densely connected graph where links cross nodes in their path.
