tableGrob: set the height and width of a grid.table

Question

I'm trying to make a function that will give me a plot ready for indesign, illustrator or inkscape. In trying to do so, I have 2 problems I cannot solve.

1) set the width and height of my plot (or just the grobTable): The output I get is very small and when upscaling it in illustrator the font follows and become way to big. Therefore I want to make plots with manually defined widths and heights.

2) Sometimes the title, note and rownames gets "misplaced" (see the difference between plot 1 and 2 for details). It happens when the rownames are short.

library(gridExtra)
library(ggplot2)

data(diamonds)

## plot function

kryds.row <- function(x,y, p=100, decor="%", digits=3,
                  titel="", note="", red=219, green=55, blue= 153){

c <- table(x, y)
s <- as.character(sum(c))
s <- paste("Antal svarpersoner=", s, sep=" ")
j <- prop.table(c,1)
r <- c(rownames(j),"Total")
k <- c(colnames(j), "Total")
j <- addmargins(j, margin =2, FUN = sum)
j <- round(j, digits)
j[]<-paste(j*p, decor, sep=" ")

farve <- rgb(red,green,blue, maxColorValue =255)

table     <-   tableGrob(j,
                       cols = k,
                       gpar.coretext = gpar(fontsize = 12),            
                       gpar.coltext  = gpar(fontsize = 12,col="white"),            
                       gpar.rowtext  = gpar(fontsize = 12, fontface="bold"),            
                       gpar.corefill = gpar(fill = rgb(255,255,255, maxColorValue      =255), alpha = 1, col = NA),
                       gpar.rowfill  = gpar(fill = rgb(255,255,255, maxColorValue =255), alpha = 1, col = NA),           
                       gpar.colfill  = gpar(fill = 0, alpha = 1 ,col= "white"),                       
                       equal.width   = TRUE,            
                       show.rownames = TRUE,            
                       show.rsep     = TRUE, 
                       show.hlines   = TRUE,                               
                       show.csep     = FALSE, 
                       show.vlines   = FALSE,
                       show.box      = FALSE,
                       padding.h     = unit(15, "mm"),            
                       padding.v     = unit(8, "mm"),
                       core.just     = "center", 
                       row.just      = "left",
                       separator     = farve)


 hh <- grobHeight(table)
 ww <- grobWidth(table)

 border <- roundrectGrob(x=0.5, y=0.5, width=ww, height=hh,
                      default.units="npc",
                      r=unit(0.1, "snpc"),
                      just="centre",
                      name=NULL, gp=gpar(col="white", fill=farve, vp=NULL)) 

 border2 <- roundrectGrob(x=0.5, y=0.5, width=ww, height=hh,
                       default.units="npc",
                       r=unit(0.1, "snpc"),
                       just="centre",
                       name=NULL, gp=gpar(fill=NA, col=farve, vp=NULL))

 title <- textGrob(titel,
                x=unit(0.5,"npc") -0.5*ww + unit(5, "mm"), 
                y=unit(0.5,"npc") +0.5*hh + unit(2, "mm"), 
                vjust=0,hjust=0, gp=gpar(fontsize=12, fontface="bold"))

 footnote <- textGrob(note, 
                   x=unit(0.5,"npc") - 0.5*ww + unit(5,"mm"),
                   y=unit(0.5,"npc") - 0.5*hh, 
                   vjust=1, hjust=0,gp=gpar( fontsize=10))

 svarpersoner       <- textGrob(s, 
                             x=unit(0.5,"npc") + 0.5*ww -unit(5, "mm"),
                             y=unit(0.5,"npc") + 0.5*hh + unit(2, "mm"), 
                             vjust=0, hjust=1,gp=gpar( fontsize=10))
 grid.newpage()
 gt <- gTree(children=gList(border,table,border2, title, footnote, svarpersoner))
 grid.draw(gt)

}



# Plot it 
kryds.row(diamonds$color, diamonds$cut, titel="title", note="note") # plot 1
kryds.row(diamonds$cut, diamonds$color, titel="title", note="note") # plot 2


# Problems
#1: The title, note and the j in the row.text is very badly placed in plot 1 but not   plot 2
#2 I cannot set the width and height of my table

I have not cleaned up in my code yet, so please bare with it!

Answer 1

The current version of gridExtra::tableGrob doesn't let you set the widths/heights. You can however try a different (experimental) version of tableGrob built from scratch using gtable.

#library(devtools)
#install_github("tablegrob", "baptiste")
require(tablegrob)

d <- iris[sample(seq.int(nrow(iris)), 6),]

grid.newpage()
pushViewport(viewport(height=0.8,width=0.9))
g2 <- tableGrob(d, rows=NULL,
                widths=unit(1,"null"), heights=unit(1/(nrow(d)),"npc"))
grid.draw(g2)
grid.roundrect(y=unit(0,"line"), height=unit(1,"npc") +unit(1,"lines"),
               just="bottom", r=unit(0.05, "snpc"))

Edit (08/2015): you can now edit the widths/heights, since grid.table is now based on gtable.

Answer 2

The solution I went with was to manipulate the length of the levels like this:

 longest <- 0
 longestnumber <- 0

 for (i in 1:length(levels(x))){

  if (longest < nchar(levels(x))[i]){
  longest <- nchar(levels(x))[i] 
  longestnumber <- i
  } 
   }

 for (i in 1:(100-longest)){
  levels(x)[longestnumber] <- paste(levels(x)[longestnumber], " ", sep="")
  }

That way I can control the width of the table