ggplot 圆环图百分比标签

Question

我正在尝试将百分比标签添加到圆环图，但未能成功绘制百分比值的清晰表示（四舍五入且不重叠）

## my data
library(ggplot2)
col <- c("white", "black", "transparent", "grey", "blue", "yellow", "green", "red", "pink", "orange", "brown")
freq <- c(101, 68, 34, 18, 14, 5, 5, 3, 2, 1, 1)
## create data frame
colour.df <- data.frame(col, freq)
colour.df

## calculate percentage 
colour.df$percentage = colour.df$freq / sum(colour.df$freq)* 100
colour.df = colour.df[rev(order(colour.df$percentage)), ]
colour.df$ymax = cumsum(colour.df$percentage)
colour.df$ymin = c(0, head(colour.df$ymax, n = -1))
colour.df

## reorder colour levels
colour.df$col <- reorder(colour.df$col,
                             new.order = c(10, 1, 9, 5, 2, 11, 4, 8, 7, 6, 3))

一切准备就绪。我可能是以一种特殊的方式来做这件事，因为我必须为涉及颜色的其他类别制作多个甜甜圈，但我无法理解那个（方面？）。

## DONUNT ##
donut = ggplot(colour.df, aes(fill = col, ymax = ymax, ymin = ymin, xmax = 100, xmin = 80)) +
geom_rect(colour = "black") +
coord_polar(theta = "y") + 
xlim(c(0, 100)) +
geom_label(aes(label = paste(percentage,"%"), x = 100, y = (ymin + ymax)/2),
         inherit.aes = F, show.legend = F, size = 5) + 
theme(legend.title = element_text(colour = "black", size = 16, face = "bold"), 
    legend.text = element_text(colour = "black", size = 15), 
    panel.grid = element_blank(),
    axis.text = element_blank(),
    axis.title = element_blank(),
    axis.ticks = element_blank()) +
annotate("text", x = 0, y = 0, size = 15, label = "Micro")
donut

我试过以下代码：

colour.df$percentage = colour.df$freq / sum(colour.df$freq)* 100
## to this
colour.df$percentage = round(colour.df$freq / sum(colour.df$freq)* 100, digits = 1)

但它会将 ymax 提高到 100.1。将它保留到 3 个小数点有帮助，但不会对重叠进行排序。

我也一直在与 geom_label & geom_text ggplot2: How to add percentage labels to a donut chart & Rounding % Labels on bar chart in ggplot2

碰头

总之长话短说。有什么技巧可以帮助塑造上面的 ^ 代码，这样我就可以在圆环图旁边得到圆角百分比标签，而不会重叠吗？

谢谢

donutchart

Answer 1

对于舍入，我们可以用 round(percentage,2) 替换百分比，对于重叠，我们可以使用 ggrepel 包中的 geom_label_repel

library(ggrepel)
donut = ggplot(colour.df, aes(fill = col, ymax = ymax, ymin = ymin, xmax = 100, xmin = 80)) +
    geom_rect(colour = "black") +
    coord_polar(theta = "y") + 
    xlim(c(0, 100)) +
    geom_label_repel(aes(label = paste(round(percentage,2),"%"), x = 100, y = (ymin + ymax)/2),inherit.aes = F, show.legend = F, size = 5)+
    theme(legend.title = element_text(colour = "black", size = 16, face = "bold"), 
        legend.text = element_text(colour = "black", size = 15), 
        panel.grid = element_blank(),
        axis.text = element_blank(),
        axis.title = element_blank(),
        axis.ticks = element_blank()) +
    annotate("text", x = 0, y = 0, size = 15, label = "Micro")
    donut

请注意，ggrepel 会产生警告（我还跳过了重新排序颜色级别步骤，请随意 correct/comment）：

In min(x) : no non-missing arguments to min; returning Inf
In max(x) : no non-missing arguments to max; returning -Inf

ggplot 圆环图百分比标签

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