add orientation and better compatible with coord_flip

[xiangpin]

• The ggplot2 has introduced orientation to control the orientation of the layer (either "x" or "y"). This is useful because some geometric layers can not change the "x" or "y" in the mapping, such as geom_density_ridges.
• In addition, the layer can also use orientation to directly control the orientation of the layer, such as geom_col, geom_bar, geom_bar ... But, when it is also compatible with the coord_flip.

original

library(ggplot2)
library(ggsignif)
dat <- data.frame(
            Group = c("S1", "S1", "S2", "S2"),
            Sub = c("A", "B", "A", "B"),
             Value = c(3, 5, 7, 8)
            )
p1 <- ggplot(dat, mapping=aes(x=Group, y=Value)) +
             geom_col(aes(fill=Sub), position="dodge", width=0.5) + 
             geom_signif(y_position=c(5.3, 8.3), 
                                 xmin=c(0.8, 1.8), 
                                 xmax=c(1.2, 2.2),
                                 annotation=c("**", "NS"), 
                                 tip_length=0) +
             geom_signif(comparisons = list(c("S1", "S2")),
                                  y_position = 9.3, 
                                  tip_length = 0, 
                                  vjust = 0.2) + 
             scale_fill_manual(values = c("grey80", "grey20"))
p1

Introducing orientation

p2 <- ggplot(dat, mapping=aes(y=Group, x=Value)) +
          geom_col(aes(fill=Sub), position="dodge", width=0.5, orientation="y") + 
          geom_signif(y_position=c(5.3, 8.3), 
                              xmin=c(0.8, 1.8), 
                              xmax=c(1.2, 2.2),
                              annotation=c("**", "NS"), 
                              tip_length=0, 
                              orientation="y") +
          geom_signif(comparisons = list(c("S1", "S2")),
                               y_position = 9.3, 
                               tip_length = 0, 
                               vjust = 0.2, 
                                orientation="y") + 
          scale_fill_manual(values = c("grey80", "grey20"))
p2

Orignal + coord_flip

p3 <- p1 + coord_flip()
p3

orientation + coord_flip

p4 <- p2 + coord_flip()
p4

[IndrajeetPatil]

Thank you so much for working on this! This looks fantastic.

Just a couple of minor things:

• Why are you adding a Makefile? Is it necessary?
• Can you please make an entry in NEWS.md about this change?

Thanks

[const-ae]

@xiangpin, Wow this is really great, thank you for addressing this longstanding shortcoming.

@IndrajeetPatil, do you know what is going on with all the CI failures. Is that expected?

Can you please make an entry in NEWS.md about this change?

That's a good idea. In addition, I would suggest adding an example in the README.Rmd and also if possible some unit tests

[IndrajeetPatil]

Some of the tests need to be updated because of this change. I can update them once this is merged.

[xiangpin]

Hello @IndrajeetPatil @const-ae

I have made some updates according to your suggestions.

• The Makefile is useful for developers to build or check ... on the local computer since it can save time by collecting common commands. For example, make all can replace the R CMD build ..., R CMD check ... etc. in this file.
• I have updated the NEWS.md, added an example to the README, and modified the unit test.

best wishes
xushuangbin

[IndrajeetPatil]

Excellent. Thanks once again for your contribution! :)