On Tue, 2011-08-16 at 17:46 -0700, ivo welch wrote:> I think I found a bug in the Cairo library, plus weird behavior in
> both the Cairo and the normal pdf device. The baseline of the spades
> symbol seems to be off. This is easier to show than it is to explain.
> The problem does not appear in the normal pdf device, which is why I
> am guessing this is a Cairo bug. moreover, I cannot figure out why
> three of the card symbols seem to be transparent, but the fourth is
> not. this is the case for both the Cairo and the ordinary pdf
> devices.
>
> I thought I would report it to the R wizards on this group...
Why? One is expressly asked to address such problems with the package
maintainer(s), especially if you feel there is a bug in the package.
And whilst Martin M is potentially indisposed at UseR! 2011, I will
mention that it is a *package* not a library when you refer to the R
package Cario. If you had identified a bug in the Cairo *library* you
should be reporting it upstream to the Cairo people:
http://www.cairographics.org/
G
> library(Cairo)
>
> clubs <- expression(symbol('\247'))
> hearts <- expression(symbol('\250'))
> diamonds <- expression(symbol('\251'))
> spades <- expression(symbol('\252'))
> csymbols <- c(clubs, diamonds, hearts, spades)
>
> CairoPDF(file = "cardsymbols.pdf")
>
> plot( 0, xlim=c(0,5), ylim=c(0,2), type="n" )
> clr <- c("black", "red", "red",
"black")
> for (i in 1:4) {
> hline <- function( yloc, ... ) for (i in 1:length(yloc)) lines(
> c(-1,6), c(yloc[i],yloc[i]), col="gray")
> hline(0.9); hline(1.0); hline(1.1); hline(1.2)
> text( i, 1, csymbols[i], col=clr[i], cex=5 )
> text( i, 0.5, csymbols[i], col=clr[i] )
> }
>
> dev.off()
>
>
>
> ----
> Ivo Welch (ivo.welch at gmail.com)
>
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