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円グラフの外にラベルを配置するにはどうすればよいですか？

ラベルが適切な場所に配置されるように、ラベルを円グラフの外側に配置するにはどうすればよいですか？

Product <- c("Product1","Product2","Product3","Product4","Product5","Product6","Product7")
Value <- c(1000000,200002,599996,1399994,2199992,2999990,3799988)
df <- data.frame(Product,Value)
df$Label <- paste(Product, paste(round(((df$Value/sum(df$Value))*100),2),"%"), sep="-")

library(ggplot2)

p <-  ggplot(df, aes(x = 1, y = Value, fill = Product)) + geom_bar(stat = "identity")
p <- p + coord_polar(theta = 'y') + theme_void()
p <- p + geom_text(aes(label = Label), position = position_stack(vjust = 0.5))

enter image description here

rggplot2pie-chart
7
Let's Yo

使用：

library(dplyr)
df <- df %>% 
  mutate(end = 2 * pi * cumsum(Value)/sum(Value),
         start = lag(end, default = 0),
         middle = 0.5 * (start + end),
         hjust = ifelse(middle > pi, 1, 0),
         vjust = ifelse(middle < pi/2 | middle > 3 * pi/2, 0, 1))

library(ggforce) # for 'geom_arc_bar'
ggplot(df) + 
  geom_arc_bar(aes(x0 = 0, y0 = 0, r0 = 0, r = 1,
                   start = start, end = end, fill = Product)) +
  geom_text(aes(x = 1.05 * sin(middle), y = 1.05 * cos(middle), label = Label,
                hjust = hjust, vjust = vjust)) +
  coord_fixed() +
  scale_x_continuous(limits = c(-1.5, 1.4),  # Adjust so labels are not cut off
                     name = "", breaks = NULL, labels = NULL) +
  scale_y_continuous(limits = c(-1, 1),      # Adjust so labels are not cut off
                     name = "", breaks = NULL, labels = NULL)

与える：

enter image description here

10
Jaap

@Jaapによる解決策に加えて、基本プロットthemeにpとscale_y_continuousを追加することもできます。

p <- ggplot(df,aes(x=1,y=Value,fill=Product))+geom_bar(stat="identity", color = "black")

p <- p + coord_polar(theta='y')+ theme(axis.ticks=element_blank(),
                                       axis.text.y=element_blank(),
                                       axis.text.x=element_text(colour='black'),
                                       axis.title=element_blank())
p <- p + scale_y_continuous(breaks=cumsum(df$Value) - df$Value / 2, labels= df$Label)

結果は次のとおりです： pe-plot

2
parth