I would like to request a new feature: the ability to rotate (set the text angle of) the vertex labels that are printed. My motivation for this was creating a graph with the sugiyama layout. I have long names for my vertices, and with them arranged along horizontal lines, the labels were overlapping to the point of being unreadable.
As a brute force proof-of-concept, I edited a local copy of plot.igraph and added a srt argument to text at https://github.com/igraph/rigraph/blob/dev/R/plot.R#L394. All the labels were printed at my (fixed, constant) specified angle. A proper implementation would allow the angle to be set as a vertex parameter (vertex.label.angle, perhaps? A consideration as to if it should be in degrees (as srt expects) or radians (to be consistent with vertex.label.degree) is needed). There are other text calls in the "add the labels" section of plot.igraph that would need to be changed, and I did not even look at whether this was possible with tkplot or rglplot
In addition to helping with long labels with the sugiyama layout, I imagine it could be helpful for grid layouts too.
I would like to request a new feature: the ability to rotate (set the text angle of) the vertex labels that are printed. My motivation for this was creating a graph with the sugiyama layout. I have long names for my vertices, and with them arranged along horizontal lines, the labels were overlapping to the point of being unreadable.
As a brute force proof-of-concept, I edited a local copy of
plot.igraphand added asrtargument totextat https://github.com/igraph/rigraph/blob/dev/R/plot.R#L394. All the labels were printed at my (fixed, constant) specified angle. A proper implementation would allow the angle to be set as a vertex parameter (vertex.label.angle, perhaps? A consideration as to if it should be in degrees (assrtexpects) or radians (to be consistent withvertex.label.degree) is needed). There are othertextcalls in the "add the labels" section ofplot.igraphthat would need to be changed, and I did not even look at whether this was possible withtkplotorrglplotIn addition to helping with long labels with the sugiyama layout, I imagine it could be helpful for grid layouts too.