graphviz - Dot language with concentrate=true confusing the graph -


i draw simple graph shown below , found different behavior of color display. 

digraph g {      concentrate=true     edge [dir=none]       -> b [color=red]      b -> c         c -> b       b ->      }

correct image of graph

graph show edge between , b red >> 1 correct.

but when change 

     digraph g {      concentrate=true     edge [dir=none]       -> b       b -> c         c -> b       b -> [color=red]     }

red color not show

this time color of edge , b black not red color want. figure out wrong here?

analysis

because code in question draws 2 edges 1 on top of other, color of last edge drawn wins. layout engine dot works either bottom top or right left. means last edge drawn first 1 listed.

general solution

dot draws digraphs. undirected graph can simulated using dir=none there should 1 edge:

digraph g {   concentrate=true   edge [dir=none]   -> b [color=red]   b -> c  }

digraph showing sue of dir=none property

alternative

keep in mind dir=none not intended display property. if goal 2 directed edges, dir=both better alternative:

digraph g {   concentrate=true   edge [dir=both]   -> b [color="red:black"]   b -> c [color="black:black] }

digraph showing use of dir=both attribute

notes

it useful conceptually separate modeling graph display properties. dot doesn't make particularly easy because encourages inlining style information. price of separating concerns pays off in debugging time.


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