I have an energy dataframe for the share of different sources of energy for several years:
Year<-c("2016","2016","2016","2017","2017","2017","2018","2018","2018")
Source<-c("coal","hydro","solar","coal","hydro","solar","coal","hydro","solar")
Share<-c(0.5,0.25,0.25,0.4,0.15,0.45,0.7,0.1,0.2)
df<-cbind.data.frame(Year,Source,Share)
I am trying to plot the dataframe as faceted pie charts for the several years:
ggplot(df, aes(x=1, y=Share, fill=Source))
geom_bar(stat="identity", width=1,position="fill")
coord_polar("y", start=0)
geom_text(aes(label = paste0(round(Share*100), "%")),size=2)
labs(x = NULL, y = NULL, fill = NULL, title = "Energy Mix")
theme_classic() theme(axis.line = element_blank(),
axis.text = element_blank(),
axis.ticks = element_blank(),
plot.title = element_text(hjust = 0.5, color = "#666666"))
facet_wrap(~Year)
and I get the following result:
How can I put the labels outside of the pie slices and centered for their arches, and how can I also add black thin borders to the slices? I know pie charts are not readable, and that bar charts are a bit better, but I am trying to play a bit diverse in options.
Many thanks in advance
CodePudding user response:
Pie charts are basically stacked bar charts - thus you can apply the same rules. Comments in the code.
library(ggplot2)
Year<-c("2016","2016","2016","2017","2017","2017","2018","2018","2018")
Source<-c("coal","hydro","solar","coal","hydro","solar","coal","hydro","solar")
Share<-c(0.5,0.25,0.25,0.4,0.15,0.45,0.7,0.1,0.2)
## don't do that cbind stuff
df<-data.frame(Year,Source,Share)
ggplot(df, aes(x=1, y=Share, fill=Source))
## geom_col is geom_bar(stat = "identity")(bit shorter)
## use color = black for the outline
geom_col(width=1,position="fill", color = "black")
coord_polar("y", start=0)
## the "radial" position is defined by x = play around with the values
## the position along the circumference is defined by y, akin to
## centering labels in stacked bar charts - you can center the
## label with the position argument
geom_text(aes(x = 1.7, label = paste0(round(Share*100), "%")), size=2,
position = position_stack(vjust = 0.5))
labs(x = NULL, y = NULL, fill = NULL, title = "Energy Mix")
theme_classic() theme(axis.line = element_blank(),
axis.text = element_blank(),
axis.ticks = element_blank(),
plot.title = element_text(hjust = 0.5, color = "#666666"))
facet_wrap(~Year)
Created on 2021-12-19 by the reprex package (v2.0.1)