[R] ggplot2: font size mismatch for pdf output

[Prof Brian Ripley]

What version of R and OS is this?  Prior to R 2.7.0 there was little 
attempt to match output dimensions from various devices, and one of the 
png devices in 2.7.0 has an error in doing so, fixed in R-patched (see 
NEWS).

On Mon, 12 May 2008, Michael Friendly wrote:

> Hi
>
> In the following, the graph I see on the screen and the .png output
> coincide.  However, in the .pdf file, the fonts seem to be scaled
> fairly larger, resulting in the label for the top legend disappearing.
> Is this an infelicity or bug, or is there something I've missed?
>
> More generally, how do I control the size of fonts used in legends
> and axis labels?
>
> library(car)
> library(ggplot2)
>
> qp <-qplot (education , income , shape=type , size=women , colour=prestige ,
> 	 xlab="Education" , ylab="Income", data=Prestige)
>   + scale_y_continuous(limits=c(NA, 20000))

Hmm, you can't break the line before '+'.

> qp + scale_size(to=c(1,8))
>
> ggsave(file="prestige-ggplot.png", width=6, height=5)  # OK
> ggsave(file="prestige-ggplot.pdf", width=6, height=5)  # fonts too large

I would not expect you to be able to specify a smaller size without also 
reducing 'pointsize'.  E.g. dev.print() does so, but ggsave seems not to.

> -Michael
>
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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