How can I manually change the text color of a ggplot2 legend in R?
There might be an easy way to do this, but I'm not sure what it is. I am trying to make the text in the legend match the next to it next to the color. I tried this for a while and couldn't find a way to use the element_text function to add multiple colors to the legend. I had no problem getting each label to have the same color, but is there a way to make each legend label a different color?
data<-data.frame(count=c(39,36,19,6), category=c("a","b","c","d"))
data$fraction = data$count / sum(data$count)
data = data[order(data$fraction), ]
data$ymax = cumsum(data$fraction)
data$ymin = c(0, head(data$ymax, n=-1))
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#Create Plot
fill <- c("blue3","cyan3","darkgrey","forestgreen")
library(ggplot2)
p1 = ggplot(data, aes(fill=category, ymax=ymax, ymin=ymin, xmax=4, xmin=3.5)) +
geom_rect(colour="White") +
coord_polar(theta="y") +
scale_fill_manual(values=fill)+
theme_bw()+
geom_label(aes(label=paste(data$fraction*100,"%"),x=4,y=
(ymin+ymax)/2),inherit.aes = F)+
theme(panel.grid=element_blank())+
theme(axis.ticks=element_blank()) +
xlim(c(0, 4)) +
theme(axis.text=element_blank()) +
theme(legend.text=element_text(color=fill,size=12))+
theme(legend.key.size=unit(2,'lines'))+
theme(legend.key=element_rect(size=5))+
labs(title="donut plot")
print(p1)
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With a few modifications to this match-legend-text-color-in-geom-text-to-symbol answer, you get what you want. But note that the answer uses editing functions grid
.
# Your data and plot
data<-data.frame(count=c(39,36,19,6), category=c("a","b","c","d"))
data$fraction = data$count / sum(data$count)
data = data[order(data$fraction), ]
data$ymax = cumsum(data$fraction)
data$ymin = c(0, head(data$ymax, n=-1))
fill <- c("blue3","cyan3","darkgrey","forestgreen")
library(ggplot2)
p1 = ggplot(data, aes(fill=category, ymax=ymax, ymin=ymin, xmax=4, xmin=3.5)) +
geom_rect(colour="White") +
coord_polar(theta="y") +
scale_fill_manual(values=fill)+
theme_bw()+
geom_label(aes(label=paste(data$fraction*100,"%"),x=4,y=
(ymin+ymax)/2),inherit.aes = F)+
theme(panel.grid=element_blank())+
theme(axis.ticks=element_blank()) +
xlim(c(0, 4)) +
theme(axis.text=element_blank()) +
theme(legend.text=element_text(color=fill,size=12))+
theme(legend.key.size=unit(2,'lines'))+
theme(legend.key=element_rect(size=5))+
labs(title="donut plot")
# Get the ggplot grob
g <- ggplotGrob(p1)
# Check out the grobs
library(grid)
grid.ls(grid.force(g))
Check out the rodent list. The vultures you want to edit are at the bottom of the list, in the "guide box" verb set - with names starting with "label". There are four gnas:
Label-3-3.4-4-4-4
label-4-3.5-4-5-4
label-5-3.6-4-6-4
label-6-3.7-4-7-4
# Get names of 'label' grobs.
names.grobs <- grid.ls(grid.force(g))$name
labels <- names.grobs[which(grepl("^label", names.grobs))]
# Edit the 'label' grobs - change their colours
# Use the `editGrob` function
for(i in seq_along(labels)) {
g <- editGrob(grid.force(g), gPath(labels[i]), grep = TRUE,
gp = gpar(col = fill[i]))
}
# Draw it
grid.newpage()
grid.draw(g)
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