[BioC] two-line labels in GO graphs

[Robert Castelo]

dear list,

i would like to produce a GO graph where the labels of the nodes are
formed by the GO identifier and the GO term and these two pieces of
information appear in two different lines within the node, in order to
draw nodes somewhat narrower than if i have these two pieces in one
single line.

the following code does the job putting GO ID and GO term in the same
line separated by one space character:

library(GOstats)
library(Rgraphviz)

goterms <- eapply(GOTERM,Term)
g <- GOGraph("GO:0016265",GOBPPARENTS)
g <- removeNode("all",g)
mt <- match(nodes(g),names(goterms))
nodattr <- makeNodeAttrs(g,label=paste(nodes(g),goterms[mt],sep=" "),
                         shape="ellipse",fillcolor="#f2f2f2",
                         fixedsize=FALSE)
plot(g,nodeAttrs=nodattr)


if i replace the space character " " by "\n" in the 'sep' parameter of
the 'makeNodeAttrs' function, i do not get the desired behavior, it just
shows the GO ID.

anyone has tried this or has an idea how it could be done ?



my sessionInfo():

R version 2.6.0 (2007-10-03) 
x86_64-unknown-linux-gnu 

locale:
C

attached base packages:
[1] splines   tools     stats     graphics  grDevices utils
datasets 
[8] methods   base     

other attached packages:
 [1] Rgraphviz_1.16.0    GOstats_2.4.0       Category_2.4.0     
 [4] genefilter_1.16.0   survival_2.32       RBGL_1.14.0        
 [7] annotate_1.16.1     xtable_1.5-2        GO.db_2.0.2        
[10] AnnotationDbi_1.0.6 RSQLite_0.6-4       DBI_0.2-4          
[13] Biobase_1.16.1      graph_1.16.1       

loaded via a namespace (and not attached):
[1] cluster_1.11.9  rcompgen_0.1-15


thanks!!
robert.