attempting to set font family on edge causes plotting error

[gaborcsardi]

From @bergsmat on September 18, 2014 13:31

For example (version 0.7.1) ...

library(igraph)
g <- graph.empty() 
g <- add.vertices(g, nv = 3)
g <- add.edges(
  g, 
  c(1,2,2,3), 
  attr = list(
    label=c('foo','bar'),
    label.family=rep('mono',times = 2)
  )
)
plot(g)

... gives ...

Error in text.default(lc.x, lc.y, labels = edge.labels, col = edge.label.color,  : 
  graphical parameter "family" has the wrong length

Like issue #213, but for edges not vertices. Same workaround applies. Code above works for times = 0 but not times = 1 etc.

Copied from original issue: igraph/igraph#681

[gaborcsardi]

From @and3k on October 22, 2014 12:24

I’m having the same problem. I’m trying to do this:

E(g)$label.family <- 'some_font'

[gaborcsardi]

@bergsmat Yep, you cannot specify the family by edge, just one font family for all edges. This is not hard to fix, although I am not sure what a typographic design person would think about using different fonts for edge labels. :)

@and3k Just setting the family seems to work fine, so please send a reproducible example that fails.

library(igraph)
g <- graph.ring(10)
plot(g, edge.label.family = "Helvetica")
E(g)$label <- LETTERS[1:10]
plot(g, edge.label.family = "Helvetica")
plot(g, edge.label.family = "Times")

[gaborcsardi]

From @and3k on October 22, 2014 14:48

Setting the family via plot() works, I wanted to set them by edge, like @bergsmat wanted to do :)

[gaborcsardi]

Ah, right, got it. That's indeed the same issue.