geom_boxjitter: can we skip drawing the jitter points?

[tungmilan]

Hello,

I want to keep only the half boxplot and replace the jitter points with the points from the ggbeeswarm package. Is it possible? Could you add an option to turn on/off the plotting of all the points?

In the example below, I can disable the color of all the jitter points but it leaves an empty space between the boxplot and the beeswarm.

Thanks!

library(ggplot2)
library(ggbeeswarm)
library(ggpol)

ggplot(iris, aes(y = Petal.Width)) + 
  geom_boxjitter(jitter.shape = NA, 
                 jitter.color = NA,
                 jitter.height = 0, 
                 jitter.width = 0,
                 outlier.color = NA, 
                 errorbar.draw = TRUE) +
  geom_quasirandom(
    aes(x = 1, color = Species),
    width = 0.25,
    size = 2, 
    groupOnX = TRUE, alpha = 0.7) +
  scale_color_brewer(palette = 'Set2') +
  theme_classic()

^{Created on 2019-05-18 by the reprex package (v0.3.0)}

[erocoar]

It's a bit more difficult than that because while only half the boxplot is shown, it takes up an entire factor on the scales together with the points. But I like the general idea so I am considering changing up the function arguments a bit. With a9496e9 you can pass on a Position class (defaults to PositionDodge).

In this case:

ggplot(iris, aes(y = Petal.Width)) +
  geom_boxjitter(jitter.position = ggbeeswarm:::PositionQuasirandom, 
                  jitter.params = formals(position_quasirandom)) +
  theme_classic()

[tungmilan]

Thanks for the quick update! Can you color different species (as in my example) too?

[erocoar]

I have to think about how to implement that in a user-friendly way. I could imagine passing a vector to jitter.color, but I don't think it will be possible to use scale_color_ for this. Will update later.

[erocoar]

Getting back to this: It seems rather pointless to implement without also properly implementing color (, fill, alpha, shape) scales. Right now the geom calls pointsGrob directly. I'll need to do some more reading into the source code to see how I can implement that. Potentially with a new geom_half_half.

[tungmilan]

@erocoar : thanks for the update!

[tungmilan]

@erocoar : Hi this is off topic but how can you control the width of the boxplot? I tried width = ... but it changed the width of the point spreading. Thanks!

[erocoar]

Okay so for the geom_quasirandom issue, could you check out whether geom_half_boxplot from gghalves package works for you and otherwise file an issue there with the specific functionality you'd like to see? It should work for your example, but probably not when you have multiple x values.

For the width, it should (and does for me) change the width of both boxplot and point spreading. Is that the case for you too?

[tungmilan]

Great! Thanks for working on this! I'll try it as soon as I can