## Phylomoji with ggtree and emojifont

With ggtree (Yu et al. 2017), it is very easy to create phylomoji. Emoji is internally supported by ggtree.

## Use emoji in taxa labels

library(ggtree)
tree_text <- "(((((cow, (whale, dolphin)), (pig2, boar)), camel), fish), seedling);"
ggtree(x, linetype="dashed", color='firebrick') +
xlim(NA, 7) + ylim(NA, 8.5) +
geom_tiplab(aes(color=label), parse='emoji', size=14, vjust=0.25) +


## Font Awesome supported in emojifont

emojifont is available in CRAN, you can use the following command to install it.

install.packages("emojifont")


An example of using emoji font in R plot is showed below:

## use emoji font in R

I have played with emoji in R for a while. My solution of using it is different from what implemented in emoGG.

emoGG is a good attemp to add emoji in ggplot2. It render emoji picture (png) and creat a layer, geom_emoji, to add emoji.

In my opinion, emoji should be treated as ordinary font in user interface, albeit it maynot be true internally.

It would be more flexible if we can use emoji as ordinary font and in this way user don’t need to learn extra stuff.