Comments (8)
You're already doing the computation in the makeContent
method. Maybe that is enough?
@pmur002 where's the best place to look for docs on grobs that redraw themselves as the plot changes size? Is there more to it than makeContent
?
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In the makeContent
method, I compute the line segment connecting the original data point to the text label. However, this method does not include computations to repel labels away from each other.
I guess what I might need is a makeContent
or drawDetails
method for the gTree
that has all the textrepelgrob
grobs. After a bit of hacking, no luck.
I tried something like this:
GeomTextRepel <- ggproto(...,
draw_panel = function(...) {
# 'grobs' is a list with many textrepelgrob's
ggname("geom_text_repel", grobTree(children = grobs, cl = "textrepeltree"))
}
)
# This doesn't seem to work...
drawDetails.textrepeltree <- function(x, recording) {
# Repulsion computation should happen here,
# where I should have access to all textrepelgrob children.
print(x)
}
# This also doesn't seem to work...
makeContent.textrepeltree <- function(x) {
# Repulsion computation should happen here,
# where I should have access to all textrepelgrob children.
print(x)
}
I'm now reading R Graphics, Second Edition by Paul Murrell, and it is helping me to understand how grid works, but I'm still a few steps away from seeing how this could be done. Chapter 8 is helpful, but does not have enough details on how to do calculations with a tree's children.
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You might also need https://journal.r-project.org/archive/2013-2/murrell.pdf and https://www.stat.auckland.ac.nz/~paul/Reports/CustomGrobs/custom-grob.html
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Thanks for those additional links! It seems that makeContent
is the proper function to use, and not drawDetails
.
Following the examples, I expect that this function should be called upon resizing the plotting area. However, I'm not seeing any output.
# Never gets called :(
makeContent.textrepeltree <- function(x) {
sink("/tmp/gridstuff.txt")
cat("testing")
sink()
# cat(x$children[[1]]$name)
x
}
If only I could get a makeContent
function to be called that has access to all the textrepelgrob
children, I would be on my way to getting this feature implemented.
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Did you export the S3 method? It might be necessary because of the way the generic gets called.
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Thanks for the tip! After exporting, it works!
I'll post again when I've made more progress.
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@hadley It works! Thank you so much for the help.
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Awesome!
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