CODEWITHSUNDEEP
rggplot2
lqdo2000
lqdo2000

Reputation: 391

bar_plot ggplot: conflict between values on bar and x axis label

I'm struggling with my code to create a barplot with ggplot2 in which I try to add y values on top of the bars, but without moving the labels of the x axis. geom_text works great to add values on the bars, but then I cannot adjust the x axis labels properly when rotated by 45˚ (i.e. the last letter of the label sticked to the axis).

My data

 dput(graph)
structure(list(x = structure(1:9, .Label = c("AAAAAAAAAAAAA", 
"BBBBBBBB", "CCCCCCCCCCCCCCCC", "DDDDD", "EEEEEEEE", "FFFFFFF", 
"GGGGGGGGGGGGGGG", "HHHHHHHHHHHHHH", "IIIII"), class = "factor"), 
    y = c(1L, 5L, 10L, 1000L, 20L, 15L, 45L, 30L, 35L)), .Names = c("x", 
"y"), class = "data.frame", row.names = c(NA, -9L))

My code:

graph <- read.table("input.txt",header=T,sep=";")
output <- ggplot(graph,aes(x=x,y=y))+
    geom_bar(stat="identity")+
    geom_text(aes(label=y,y=(y+25)))+
    scale_x_discrete()+
    scale_y_continuous(limits=c(0,max(50 + graph$y)))+
    theme(axis.text.x=element_text(angle=45,vjust=0))
print(output)

I cannot post an image of the output, but the plot looks fine except the tick marks of the x axis fit to the middle of the x labels instead of the last letter of the label.

Upvotes: 2

Views: 2456

Answers (2)

agstudy
agstudy

Reputation: 121568

Here a ggplot2-like lattice version:

library(lattice)
library(latticeExtra)
barchart(y~x, data=dat,
         scales = list(x = list(rot=45,cex=1.5)),
         par.settings = ggplot2like(), axis = axis.grid,
         panel=function(x,y,...){
           panel.barchart(x,y,...)
           panel.text(x,y,label=y,col='red',
                      adj=c(0.5,-0.5),cex=2)
         })

enter image description here

EDIT

To decrease differences between bars levels , one idea here is to use log scale:

library(lattice)
library(latticeExtra)
barchart(y~x, data=dat,
         scales = list(x = list(rot=45,cex=1.5),
                       y = list(log=10)),
         par.settings = ggplot2like(), axis = axis.grid,
         yscale.components = yscale.components.log10ticks,
         panel=function(x,y,...){
           panel.barchart(x,y,...)
           panel.text(x,y,label=10^y,col='red',
                      adj=c(0.5,-0.5),cex=2)
         })

enter image description here

Upvotes: 1

Didzis Elferts
Didzis Elferts

Reputation: 98429

You should add hjust=1 to axis.text.x= and change vjust=0 to vjust=1. To change appearance of bars you can try to use transformation of y values, for example, square root, with scale_y_sqrt(). Only positions for geom_text() should be adjusted.

output <- ggplot(graph,aes(x=x,y=y))+
  geom_bar(stat="identity")+
  geom_text(aes(label=y,y=(y+c(10,10,10,50,10,10,10,10,10))))+
  scale_y_sqrt(limits=c(0,max(50 + graph$y)),breaks=c(10,100,250,500,1000))+
  theme(axis.text.x=element_text(angle=45,vjust=1,hjust=1))
output

enter image description here

Upvotes: 4

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