Re: [Rd] grid stringHeight

From: baptiste auguie <baptiste.auguie_at_googlemail.com>
Date: Sat, 30 Apr 2011 11:58:40 +1200

On 27 April 2011 11:06, baptiste auguie <baptiste.auguie_at_googlemail.com> wrote:
> Dear all,
>
> I'm puzzled by the behavior of stringHeight in the grid package.
> Consider the following test,
>
> library(grid)
>
> test <- function(lab="dog", ...){
>  g1 <- textGrob(lab)
>  g2 <- rectGrob(height=grobHeight(g1), width=grobWidth(g1))
>  gg <- gTree(children=gList(g1,g2), ...)
>
>  print(c("height:", convertUnit(stringHeight(lab), "mm", "y")))
>  grid.draw(gg)
> }
>
> grid.newpage()
> test()
> test(expression(dog), vp=viewport(x=0.6))
> ## notice how the dog's tail is being cut off, where
> ## expression yields a snug cage
>
> grid.newpage()
> test("aoc")
> test(expression(aoc), vp=viewport(x=0.6))
>
> It appears that stringHeight correctly calculates the height for an
> expression, but not for a basic string. I think it used to produce the
> same output for both.
>
> Best regards,
>
> baptiste
>
> sessionInfo()
> R version 2.13.0 alpha (2011-03-27 r55076)
> Platform: i386-apple-darwin9.8.0 (32-bit)
>
> locale:
> [1] C
>
> attached base packages:
> [1] stats     graphics  grDevices utils     datasets  grid      methods
> [8] base
>

I have now filed a bug report for this issue, though I could only confirm it on one operating system.

https://bugs.r-project.org/bugzilla3/show_bug.cgi?id=14566

Best regards,

baptiste



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