Adding a black border to plotted colored points

[parcbioinfo]

Hi Kevin, I am trying to add a black border to the colored points in biplot (usually, in R I use pch=21) but have not been able to. How do I change the shape of all points (they are colored by "group") to filled-in circles with a black border (keeping the colors that are already in place)? I need this rather than shape by group because it will help to distinguish multiple points when they are close together.

[kevinblighe]

Hi! PCAtools is mainly based on ggplot2, so, you have to go by the ggplot2 shape codes. The same effect that you want can be availed of via the following parameters, I think:

shape = NUL
shapekey = NULL

There are sections in the vignette about these.

[parcbioinfo]

Yes, I got it. Thank you! Here is the code (in case anybody else needs to find out how to do it) that worked the way I needed it to:
biplot(p, lab=NULL, hline = 0, vline = 0, colby = 'Group', colkey = c('A.C'='yellow', 'A.E'='purple', 'H.C'='blue', 'H.E'='darkgreen', 'O.C'='darkblue', 'O.E'='red', 'P.C'='brown', 'P.E'='black'), legendPosition = 'right', drawConnectors = F, gridlines.major = FALSE gridlines.minor = FALSE, pointSize = 3.5) +
geom_point(shape = 21,size = 3.5,colour = "black") +
theme(text = element_text(size = 20), axis.text.x = element_text(size = 20), axis.text.y = element_text(size = 20), legend.key=element_blank(), panel.grid.major = element_blank(), panel.grid.minor = element_blank(), panel.background = element_blank(), panel.border = element_rect(linetype = "solid", fill = NA))