R 调整饼图的大小

我制作了这些饼图：

df <- expand.grid(log.var = c(TRUE, FALSE), zone = 1:4)
df$proportion <- c(0.3, 0.7, 0.4, 0.6, 0.2, 0.8, 0.5, 0.5)
df$size = sample(1:20, 8)

library(ggplot2)
ggplot(df, aes(factor(1), proportion, fill = log.var)) + 
   geom_bar(stat = "identity") + coord_polar(theta = "y") + facet_grid(.~zone)

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df@lukeA的建议是合理的，但并不奏效：

library("ggplot2"); theme_set(theme_bw())
library("dplyr")  ## for mutate()
set.seed(101)
df <- expand.grid(log.var = c(TRUE, FALSE), zone = 1:4)
df <- mutate(df,
   proportion=c(0.3, 0.7, 0.4, 0.6, 0.2, 0.8, 0.5, 0.5),
   size = sample(1:20, 8),
   totsize=ave(size, zone,FUN=sum))

g0 <- ggplot(df, aes(x=factor(1), y=proportion, fill = log.var))
g0 + geom_bar(stat="identity",aes(width=totsize))+facet_grid(.~zone)+
        coord_polar(theta = "y")

类似于
ggplot（转换（df，sum=with（df，ave（大小，区域，FUN=sum））），aes（因子（1），比例，填充=log.var，宽度=sum））+…
？
df <- df %>% group_by(zone) %>%
    mutate(cp1=c(0,head(cumsum(proportion),-1)),
              cp2=cumsum(proportion))

ggplot(df) + geom_rect(aes(xmin=0,xmax=totsize,ymin=cp1,ymax=cp2,
                           fill=log.var)) + facet_grid(.~zone)+
                               coord_polar(theta = "y")