Line Breaks Between Words in Axis Labels in ggplot in R

lineBreaks.R

library(OIdata)
data(birds)
library(ggplot2)

levels(birds$effect) <- gsub(" ", "\n", levels(birds$effect))
ggplot(birds,
  aes(x = effect,
    y = speed)) +
geom_boxplot() + 
coord_flip()

sessionInfo.txt

R version 3.0.1 (2013-05-16)
Platform: x86_64-pc-linux-gnu (64-bit)

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8    
 [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=C                 LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] grid      stats     graphics  grDevices utils     datasets  methods  
[8] base     

other attached packages:
[1] gridExtra_0.9.1 ggplot2_0.9.3.1 OIdata_1.0      maps_2.3-6     
[5] RCurl_1.95-4.1  bitops_1.0-6   

loaded via a namespace (and not attached):
 [1] colorspace_1.2-3   dichromat_2.0-0    digest_0.6.3       gtable_0.1.2      
 [5] labeling_0.2       MASS_7.3-29        munsell_0.4.2      plyr_1.8          
 [9] proto_0.3-10       RColorBrewer_1.0-5 reshape2_1.2.2     scales_0.2.3      
[13] stringr_0.6.2      tools_3.0.1       

tableAsImage-simple.R

library(OIdata)
data(birds)
library(gridExtra)

# line breaks between words for levels of birds$effect:
levels(birds$effect) <- gsub(" ", "\n", levels(birds$effect))

xyTable <- table(birds$sky, birds$effect)

plot.new()
grid.table(xyTable,
  # change font sizes:
  gpar.coltext = gpar(cex = 1.2),
  gpar.rowtext = gpar(cex = 1.2))

tableAsImage.R

library(OIdata)
data(birds)
library(ggplot2)
library(gridExtra)

# line breaks between words for levels of birds$effect:
levels(birds$effect) <- gsub(" ", "\n", levels(birds$effect))

xyTable <- table(birds$sky, birds$effect)

qplot(1:10, 1:10, geom = "blank") + 
theme_bw() +
theme(line = element_blank(),
  text = element_blank()) +
annotation_custom(grob = tableGrob(xyTable,
  # change font sizes:
  gpar.coltext = gpar(cex = 1.2),
  gpar.rowtext = gpar(cex = 1.2)),
  xmin = -Inf, xmax = Inf, ymin = -Inf, ymax = Inf)