[R] font size in graphs...can R read Windows settings?

[Duncan Mackay]

Hi Dan

 

This is one of  the features/problems of proportional graphing – getting it exactly right.

 

Anyway good graphs usually take time

 

I wonder if aspect in both base and lattice may be of use.

Also I have a default par settings for base graphics where I sometimes change the mai command for multiple graphs and rarely the font size.

 

par(mfrow = c(1,1),

    las = 1,

    mai = c(0.85, 0.85, 0.32, 0.12),

    font.main = 1,

    cex.main = 1.0,

    cex.lab  = 1.0,

    cex.axis = 0.9)

 

Duncan

 

From: Dalthorp, Daniel [mailto:ddalthorp at usgs.gov] 
Sent: Friday, 29 July 2016 09:22
To: Duncan Mackay
Cc: R
Subject: Re: [R] font size in graphs...can R read Windows settings?

 

Thanks, Duncan. This is close to what I was looking for. But I'm not using lattice. And the fontsize$text and fontsize$points are independent of display settings in Windows (screen resolution and 'size of objects').

 

I need to make my graphs [esp. placement and size of text(), mtext()] look good regardless of display settings.

 

Here's what I'm working with at the moment...

 

When package is loaded, I store the default graph size ('din') which is correlated with OS display parameters. Then, I simply multiple my current 'cex' values by the stored 'din' divided by 7 (which is the 'din' associated with the display parameters that I created the figs in initially). It seems to work just fine for my text() and mtext() text sizes. 

 

But some of my algorithms for placing text and subfigs in margins still need fixing...combinations of 'plt' and 'usr' seem to be working, but it's tedious.

 

-Dan

 

On Wed, Jul 27, 2016 at 8:43 PM, Duncan Mackay <dulcalma at bigpond.com> wrote:

Hi  Dan

For devices png, pdf, postscript and ? others the pointsize argument
controls the font size which is modified by cex

For lattice there are the settings in trellis.par.get()

trellis.par.get()$fontsize
$text
[1] 12

$points
[1] 8

which you can set and there is no real need to change font size except if
you need to change main.
trellis.par.get()$grid.pars  are the settings for grid elements if used  eg
text

these could be set globally by trellis.par.set() or individually with
argument par.settings eg
xyplot(y ~ x, data = datm,
             par.settings = list(strip.background = list(col =
"transparent"),
                                                 fontsize = list(text = 16,

points = 12),  # large size;  need to refine
                                                superpose.polygon= list(col
= c("red","blue"),

border = c("red","blue"))),
            type = "b")

Regards

Duncan

Duncan Mackay
Department of Agronomy and Soil Science
University of New England
Armidale NSW 2351
Email: home: mackay at northnet.com.au

-----Original Message-----
From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Dalthorp,
Daniel
Sent: Thursday, 28 July 2016 07:02
To: r-help at R-project.org (r-help at r-project.org)
Subject: [R] font size in graphs...can R read Windows settings?

Hi All,
I am putting together a package that (among other things) draws some nice
graphs for users. I place some explanatory text on figs using "text" and
"mtext". But the size of the text depends on the Windows display settings:
Smaller (100%), medium (125%) or larger (150%) (In Windows 7... Control
panel | Appearance and personalization | Display | Make text and other
items smaller or larger). If I create figs that look good with one setting,
the text is too big (or too small) if another setting is used in Windows.
If I know the Windows setting, I can use cex in R to make the right sized
labels, but if I don't know a user's Windows display size setting...is
there a way for R to read the setting? Or is there another way to control
label size so that text labels on graphs look good regardless of WIndows
display size setting?

Many thanks for Ideas,

-Dan
--
Dan Dalthorp, PhD
USGS Forest and Rangeland Ecosystem Science Center
Forest Sciences Lab, Rm 189
3200 SW Jefferson Way
Corvallis, OR 97331
ph: 541-750-0953
ddalthorp at usgs.gov

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-- 

Dan Dalthorp, PhD

USGS Forest and Rangeland Ecosystem Science Center
Forest Sciences Lab, Rm 189
3200 SW Jefferson Way 
Corvallis, OR 97331 
ph: 541-750-0953
ddalthorp at usgs.gov


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