Resize strip.background to match strip.text in ggplot facet_wrap
I am trying to do a lot of "small multiples" plots.
(Secondary / Background) I have too many faces to display in one graph, so I need to adjust them manually for separate plots. I was hoping that I could simply pass the desired ncol
and nrow
in facet_wrap
, and he would do as much as I need. This is beside the point.
Since I have so many facets, space is at its best. So, I wanted to reduce the size of the facet labels. It is easy enough to reduce the font size strip.text
, but unfortunately the rectangle strip.background
does not have a font size and does not provide sizing options (other than the border size). Setting it to element_blank()
doesn't actually remove the space allocated to it, it just makes the same space transparent.
MWE:
set.seed(1)
xcat = rep(1:10, 1000)
yvalue1 = rep(runif(10,5,7),1000)
yvalue2 = rep(runif(10,4,6),1000)
id = rep(1:1000,each=10)
df = data.frame(id,xcat,yvalue1,yvalue2)
for(i in seq(1, length(unique(df$id)), by=100)){
print(
ggplot(subset(df, id %in% unique(df$id)[i:(i+99)]), aes(x=xcat)) +
annotate("line", y=yvalue1, x=xcat, colour="cornflowerblue") +
annotate("line", y=yvalue2, x=xcat, colour="grey20") +
theme(axis.text.x = element_text(size=5),
axis.text.y = element_text(size=5),
strip.text = element_text(size=5)) +
facet_wrap(~id, ncol=10, nrow=10) +
expand_limits(y=0))
}
Any ideas on how I could reduce the height of this strip.background so that it doesn't take up that much space? Ideally it will be the exact height of the id text.
As a bonus, how to reduce the distance between the edges? (Is there a parameter in facet_wrap I'm missing?)
It also takes a REALLY long time with RStudio facet_wrap
(without facet_wrap it's much faster.
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The result you want can be modified by modifying the grobs
created one ggplot
. This process is somewhat confusing and required for manual configuration:
Leaving aside a loop that doesn't affect the problem, we can start by decreasing the distance between the faces. This can be easily done by adding an argument panel.spacing
to theme
.
library(ggplot2)
d <- ggplot(subset(df, id %in% unique(df$id)[1:(100)]), aes(x=xcat)) +
annotate("line", y=yvalue1, x=xcat, colour="cornflowerblue") +
annotate("line", y=yvalue2, x=xcat, colour="grey20") +
theme(axis.text.x = element_text(size=5),
axis.text.y = element_text(size=5),
strip.text = element_text(size=5),
panel.spacing = unit(.5, 'pt')) +
facet_wrap(~id, ncol=10, nrow=10) +
expand_limits(y=0)
Then we need to generate ggplot2 plot grob. This will create a list of the individual elements that make up the plot.
g <- ggplotGrob(d)
head(g, 5)
# TableGrob (5 x 43) "layout": 13 grobs
# z cells name grob
# 1 3 ( 5- 5, 4- 4) axis-t-1-1 zeroGrob[NULL]
# 2 3 ( 5- 5, 8- 8) axis-t-2-1 zeroGrob[NULL]
# 3 3 ( 5- 5,12-12) axis-t-3-1 zeroGrob[NULL]
# 4 3 ( 5- 5,16-16) axis-t-4-1 zeroGrob[NULL]
# 5 3 ( 5- 5,20-20) axis-t-5-1 zeroGrob[NULL]
# 6 3 ( 5- 5,24-24) axis-t-6-1 zeroGrob[NULL]
# 7 3 ( 5- 5,28-28) axis-t-7-1 zeroGrob[NULL]
# 8 3 ( 5- 5,32-32) axis-t-8-1 zeroGrob[NULL]
# 9 3 ( 5- 5,36-36) axis-t-9-1 zeroGrob[NULL]
# 10 3 ( 5- 5,40-40) axis-t-10-1 zeroGrob[NULL]
# 11 4 ( 4- 4, 4-40) xlab-t zeroGrob[NULL]
# 12 8 ( 3- 3, 4-40) subtitle zeroGrob[plot.subtitle..zeroGrob.77669]
# 13 9 ( 2- 2, 4-40) title zeroGrob[plot.title..zeroGrob.77668]
Our goal is to find and fix the height in relation to the stripes.
for(i in 1:length(g$grobs)) {
if(g$grobs[[i]]$name == 'strip') g$grobs[[i]]$heights <- unit(5, 'points')
}
Unfortunately, strip
grobs
different heights
main section is affected , which is divided into, so we have to reduce that as well. I haven't found a way to identify programmatically which heights are g$heights
relative to the strip, but checking is pretty quick to figure out what we need.
g$heights
# [1] 5.5pt 0cm 0cm 0cm 0cm
# [6] 0.518897450532725cm 1null 0cm 0.5pt 0cm
# [11] 0.518897450532725cm 1null 0cm 0.5pt 0cm
# [16] 0.518897450532725cm 1null 0cm 0.5pt 0cm
# [21] 0.518897450532725cm 1null 0cm 0.5pt 0cm
# [26] 0.518897450532725cm 1null 0cm 0.5pt 0cm
# [31] 0.518897450532725cm 1null 0cm 0.5pt 0cm
# [36] 0.518897450532725cm 1null 0cm 0.5pt 0cm
# [41] 0.518897450532725cm 1null 0cm 0.5pt 0cm
# [46] 0.518897450532725cm 1null 0cm 0.5pt 0cm
# [51] 0.518897450532725cm 1null 0.306264269406393cm 1grobheight 0cm
# [56] 5.5pt
strip_grob_position <- seq(6, length(g$heights) - 5, 5)
for(i in strip_grob_position) {
g$heights[[i]] = unit(.05, 'cm')
}
Finally, we can do the result:
library(grid)
grid.newpage()
grid.draw(g)
I am not an expert at all in the topic, so I could say or explain something incorrectly or inaccurately. Also, there may be better (and simpler and more ggplot-ish) ways to get the result.
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