Symbols in pdf plot

[Ian Saunders]

I'm drawing a simple point graph, with the symbol size increased to make it clearer.

 

All is well when I show the plot on screen in windows() or save it to a png file with png(), but when I use pdf(), the size of the round symbol is much smaller than the other symbols.

 

This is a sample of code:

data <- data.frame(x=1:12,y=1:12,col=factor(rep(1:3,4)),shape=factor(rep(1:4,3)))
g <- ggplot(data,aes(x=x,y=y))
print( g+geom_point(aes(colour=col,shape=shape),size=5) )

Am I missing something or is this a bug? The same happens with pdf() in windows and in linux.

 

Thanks

Ian.

 

 

[Winston Chang]

The pdf and png file you supplied look pretty much the same to me on
my Mac with Preview.app and with Adobe Reader. It's possible that the
issue is your PDF renderer.

By default, R uses the Zapf Dingbats font to represent some point
shapes, and this can occasionally cause problems. Try turning it off
with this:
pdf("file.pdf", useDingbats=FALSE)

-Winston

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[Ian Saunders]

Thanks, Winston. Yes, that was it. Coincidentally I had my computer upgraded to Windows 7 and a new version of Adobe Reader and the plot looks fine now.

All the best

Ian.