Adjusting fontsize on plots

[bhive]

Hello,

I've been trying to use ggplot2 to plot means and standard errors. I
increased the size of the png outputs to make them crisp at higher
resolution, but this makes the font tiny on the axes and axes labels.
I looked up how to do it, but I can't even get the examples to work.

From http://had.co.nz/ggplot2/book.pdf :

qplot(mpg, wt, data=mtcars, facets = . ~ cyl)
grid.gedit("label", gp=gpar(fontsize=14, col="red"))

I get:

Error in editDLfromGPath(gPath, specs, strict, grep, global,
redraw) :
'gPath' (label) not found

Is there a different way to do it that I'm unaware of. Have things
changed in a newer version that the documentation hasn't caught up
with yet?

Thanks,

Brandon

[Brandon Hurr]

Here is my session info if it helps at all. 

R version 2.10.1 (2009-12-14) 

x86_64-apple-darwin9.8.0 

locale:

[1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8

attached base packages:

[1] grid      stats     graphics  grDevices utils     datasets 

[7] methods   base     

other attached packages:

[1] ggplot2_0.8.6 digest_0.4.2  reshape_0.8.3 plyr_0.1.9   

[5] proto_0.3-8  

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[hadley wickham]

Hi Brandon,

I didn't realise that copy of the book was still up on the web - it's
very out of date.

You can probably fix the problem using
theme_set(theme_grey(fontsize)), but that shouldn't be necessary - you
should be adjusting the png dpi not the overall size. It's difficult
to know what's going wrong without a reproducible example.

Hadley

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[Dennis Murphy]

Hi:

Without resorting to grid, you can get increased label size and new colors
through opts(). With your example,

qplot(mpg, wt, data=mtcars, facets = . ~ cyl) +
  opts(axis.title.x = theme_text(size = 14, colour = 'red')) +
  opts(axis.title.y = theme_text(size = 14, colour = 'red', angle = 90))

gets what I think you want from the graph.

My question: why does one need angle = 90 for the y-axis label?
Try this with angle = 90 and without it to see what I mean. Feature or ...?

HTH,
Dennis

[Brandon Hurr]

Hadley,

Google knows and sees all. When I searched for font size in ggplot2 that's one of the only hits I got that seemed relevant. Too bad it was so badly out of date. 

I was adjusting the width and height of the output without adjusting the resolution/DPI. With the following I get good looking output. 

png(filename=path.expand(paste("~/desktop/results/", fp, sep="")) , type="quartz", width = 1200, height = 1200, res=200) 

Dennis, 

I have an opt() line in my function, and adjusting the text in there works well so thanks for your advice. 

Thanks, 

Brandon

P.S. I should have figured it was something simple, and sorry about not supplying a slimmed down example. It's been a while since my little program has been simple and my brain hurts from a busy week.