How to do a semi circle donut with highcharter library? - r

Question

I'm trying to do a semi circle donut with highcharter library but I only know how to do a pie chart. I know that with JS you can do it by adding "startAngle" and "endAngle" but I want to know how to do it with R:
A <- c("a", "b", "c", "d")
B <- c(4, 6, 9, 2)
C <- c(23, 26, 13, 15)
df <- data.frame(A, B, C)
highchart() %>%
hc_chart(type = "pie") %>%
hc_add_series_labels_values(labels = df$A, values = df$B)%>%
hc_tooltip(crosshairs = TRUE, borderWidth = 5, sort = TRUE, shared = TRUE, table = TRUE,
pointFormat = paste('<b>{point.percentage:.1f}%</b>')
) %>%
hc_title(text = "ABC",
margin = 20,
style = list(color = "#144746", useHTML = TRUE))
Thank you!

Answer 1

You can do something like this though not using Highcharts library.
library(tidyverse)
library(ggforce)
library(scales)
library(ggplot2)
# -------------------------------------------------------------------------
A <- c("a", "b", "c", "d")
B <- c(4, 6, 9, 2)
C <- c(23, 26, 13, 15)
df <- data.frame(A, B, C)
# Ensure A is a factor (we'll be using it to fill the pie)
df$A <- factor(df$A)
# compute the individual proportion in this case using var C
df$prop <- df$C/sum(df$C)
# compute the cumulative proportion and use that to plot ymax
df$p_end <- cumsum(df$prop)
# generate a y-min between 0 and 1 less value than p_end (using p_end)
df$p_start <- c(0, head(df$p_end ,-1))
# -------------------------------------------------------------------------
# plot
df %>%
mutate_at(c("p_start", "p_end"), rescale, to=pi*c(-.5,.5), from=0:1) %>%
ggplot +
geom_arc_bar(aes(x0 = 0, y0 = 0, r0 = .5, r = 1, start = p_start, end = p_end, fill=A)) +
coord_fixed() +xlab("X_label") + ylab("Y_lablel") + guides(fill=guide_legend(title="Legend Title"))
Output
Hope that helps.

Answer 2

Try adding startAngle = -90, endAngle = 90 inside hc_add_series_labels_values.
Note as per the warning hc_add_series_labels_values is deprecated so suggest using hc_add_series.
highchart() %>%
hc_add_series(type = "pie", data = df, hcaes(x = A, y = B), startAngle = -90, endAngle = 90) %>%
hc_tooltip(pointFormat = '<b>{point.percentage:.1f}%</b>') %>%
hc_title(text = "ABC",
margin = 20,
style = list(color = "#144746", useHTML = TRUE))