r - Add second caption to polar coordinates based ggplot2 plot -


i have been asked recreate pie chart using ggplot2 , having difficulty adding second caption plot. need caption on bottom left of plot and bottom right.

my current approach can 1 or other using hjust option caption placement (0 left-align; 1 right-align):

library(ggplot2) dat <- data.frame(variable = c("v1", "v2", "v3"),                   value = c(.80,.50,.63)) p1 <- ggplot(dat,               aes(x = 1, y = value, fill = variable)) +   geom_bar(stat = "identity") +   coord_polar(theta = "y")  +   theme(legend.position = 'none',         plot.caption = element_text(hjust = 1)) +   labs(caption  = "right caption")  print(p1)

this produces:

pie chart right caption

i've seen approaches use annotate() cannot seem them work coord_polar().

does know how can second caption appear on left-hand side of plot (horizontally aligned right caption)? maybe possible overlay blank layer has left caption?

using grid package possible add text grob containing left caption.

library(ggplot2) library(grid) dat <- data.frame(variable=c("v1", "v2", "v3"), value=c(.80,.50,.63))  p1 <- ggplot(dat, aes(x = 1, y = value, fill = variable)) +   geom_bar(stat = "identity") +   coord_polar(theta = "y") +   theme(legend.position='none', plot.caption=element_text(hjust=1)) +   labs(caption="right caption")  # generate ggplot2 plot grob p2 <- ggplotgrob(p1) # find grob tree containing right caption (as child) k <- which(p2$layout$name=="caption") # copy "right caption" text grob in grbtxt grbtxt <- p2$grobs[[k]]$children[[1]]  # modify content , position of text grob   grbtxt$label <- "left caption" grbtxt$name <- "grid.text.left" grbtxt$x <- unit(0,"npc") grbtxt$hjust <- 0 grbtxt$gp$col <- "red"  # add grbtxt (left caption) title grob containing right caption p2$grobs[[k]] <- addgrob(p2$grobs[[k]],grbtxt) grid.draw(p2)

enter image description here


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