R stacked bar graph plotting geom_text

Question

I\'m trying to plot a stacked bar graph in R using ggplot. I also want to include percentage in each piece of bars for that piece. I tried to follow the posts 1, 2, 3 but th

Answer 1

Here a solution using barchart from lattice.

library(latticeExtra)
barchart(Percentage~Form|Sample_type*Sample_name,data=dat,
         groups =Position,stack=T,
         panel=function(...){
           panel.barchart(...)
           ll <- list(...)
           keep <- !is.na(ll$groups[ll$subscripts])
           x <- as.numeric(ll$x[keep])
           y <- as.numeric(ll$y[keep])
           groups <- as.numeric(factor(ll$groups)[ll$subscripts[keep]])
           for (i in unique(x)) {
               ok <- x == i
               ord <- sort.list(groups[ok])
               pos <- y[ok][ord] > 0
               nok <- sum(pos, na.rm = TRUE)
               h <- y[ok][ord][pos]
               panel.text(x = rep(i, nok),y = cumsum(h)-0.5*h,
                          label = h,cex=1.5)
             }
         },
         auto.key = list(columns = 5), 
         par.settings = ggplot2like(n = 5),
         lattice.options = ggplot2like.opts())