In ggplot2, the layers are stacked in a particular order which determines which elements of the plot appear on top. By default, line segments created using stat_density_ridges()
are placed behind the histograms. However, you can bring them to the front by changing the layer ordering.
One way to do this is to use the position_stack(reverse = TRUE)
argument in ggplot()
to reverse the order of the layers. You can adjust the z
value of the line segments using the position
argument in geom_density_ridges()
.
Here's an example:
library(ggplot2)
library(ggridges)
ggplot(mpg, aes(x = cty, y = class)) +
geom_density_ridges(alpha = 0.5, color = "white", fill = "#69b3a2",
scale = 0.9, size = 0.25, position = position_stack(vjust = 0.5)) +
geom_segment(aes(x = 0, xend = 40, y = class, yend = class),
size = 0.5, color = "black", position = position_stack(vjust = 0.5)) +
scale_x_continuous(expand = c(0, 0)) +
theme_ridges() +
labs(x = NULL, y = NULL) +
theme(legend.position = "bottom") +
position_stack(reverse = TRUE)
In this example, we use position_stack(vjust = 0.5)
in both geom_density_ridges()
and geom_segments()
to ensure that they are aligned vertically. We set position_stack(reverse = TRUE)
in ggplot()
to reverse the order of the layers, so that the line segments appear on top of the histograms. Finally, we adjust the z
value of the line segments using position = position_stack(vjust = 0.5)
.
The result is a plot where the line segments appear in front of the histograms:
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Asked: 2023-07-04 22:36:08 +0000
Seen: 11 times
Last updated: Jul 04 '23
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