rgraphvizdiagrammer

DiagrammeR grViz labelfontsize and labelfontcolor do nothing

I want to change the color and size of the text above the edges of a graph. According to the docs, labelfontsize and labelfontcolor should do it for taillabel and headlabel (and indeed they do).

How do I do it if I want to place my label on the center of the edge using label?

Here's an example of "something red" showing in black and fontsize=20. If you change label for headlabel, arguments work as expected.

DiagrammeR::grViz("
digraph boxes_and_circles {
  
  # a 'graph' statement
  graph [overlap = true, fontsize = 20, rankdir='LR']

  # several 'node' statements
  node [shape = circle,
        fixedsize = true,
        width=0.9,
        fontname = Helvetica]
  A; B
  A -> B [label='something red', labelfontsize=2, labelfontcolor=red]
  }
")
Solution

  • If I understand you correctly:

    DiagrammeR::grViz("
digraph boxes_and_circles {
  
  # a 'graph' statement
  graph [overlap = true, fontsize = 20, rankdir='LR']

  # several 'node' statements
  node [shape = circle,
        fixedsize = true,
        width=0.9,
        fontname = Helvetica]
  A; B
  A -> B [label='something red', fontsize=15, fontcolor='#ff0000']
  }
")

    red

    https://cran.microsoft.com/snapshot/2015-03-28/web/packages/DiagrammeR/README.html