r - 添加自定义垂直线joyplots ggridges

Question

我想使用 ggridges 为喜悦图逐行添加一条垂直线.

# toy example
ggplot(iris, aes(x=Sepal.Length, y=Species, fill=..x..)) +
geom_density_ridges_gradient(jittered_points = FALSE, quantile_lines = 
FALSE, quantiles = 2, scale=0.9, color='white') +
scale_y_discrete(expand = c(0.01, 0)) +
theme_ridges(grid = FALSE, center = TRUE)

我想在 7 处为 virginica 添加一条垂直线，为 versicolor 添加 4 条，为 setosa 添加 5 条垂直线。关于如何做到这一点的任何想法？

Answer 1

由于您的密度不重叠，因此添加额外的段可能是最简单的。

iris_lines <- data.frame(Species = c("setosa", "versicolor", "virginica"),
                         x0 = c(5, 4, 7))

ggplot(iris, aes(x=Sepal.Length, y=Species, fill=..x..)) +
  geom_density_ridges_gradient(jittered_points = FALSE, quantile_lines = 
                                 FALSE, quantiles = 2, scale=0.9, color='white') +
  geom_segment(data = iris_lines, aes(x = x0, xend = x0, y = as.numeric(Species),
                                      yend = as.numeric(Species) + .9),
               color = "red") +
  scale_y_discrete(expand = c(0.01, 0)) +
  theme_ridges(grid = FALSE, center = TRUE)