Re: [R] screen resolution effects on graphics

From: Romain Francois <rfrancois_at_mango-solutions.com>
Date: Tue 29 Aug 2006 - 04:29:32 EST

Prof Brian Ripley a écrit :
> On Mon, 28 Aug 2006, Charles Annis, P.E. wrote:
>
>
>> Greetings, R-Citizens:
>>
>> I have the good fortune of working with a 19" 1280 X 1024 pixel monitor. My
>>
>
> (Similar to our student lab has used for many years.)
>
>
>> R-code produces nice-looking graphics on this machine but the same code
>> results in crowded plots on an older machine with 800 X 600 resolution. In
>> hindsight this seems obvious, but I didn't anticipate it.
>>
>
> It is not obvious to me: I have never experienced it. What OS and
> graphics device is this?
>
> Almost all of R's graphics is independent of the screen resolution (the
> exception being the bitmapped devices such as jpeg), with things sized in
> inches or points. My machines are 1600x1200 (apart from 1280x800 on my
> laptop), so I meet a considerable reduction when using a computer
> projector, and my plots do not look crowded.
>
> However, one issue is when the OS has a seriously incorrect setting for
> the screen resolution and so does not give the sizes asked for by R. We
> have seen that on both Linux and Windows, and the windows() device has
> arguments to set the correct values. (On X11 you should be able to set
> this in Xconfig files.)
>
> If this is Windows, check carefully the description of the initial screen
> size in ?windows. That can have unexpected effects on physically small
> screens.
>
> At one time the X11() device was set up to assume 75dpi unless the
> reported resolution was 100+/-0.5dpi. My then monitor reported 99.2 dpi
> and so things came out at 3/4 of the intended size. We fixed that quite a
> while back.
>
>
>> My code will be used on machines with varying graphics (and memory)
>> capacity. Is there a way I can check the native resolution of the machine
>> so that I can make adjustments to my code for the possible limitations of
>> the machine running it?
>>
>
> Only via C code, which is how R does it.
Hi,

Javascript knows, can we ask him ?

I mean, if I do that in R :

a <- tempfile()
cat('<html><script type="text/javascript"> document.write(screen.width) ; </script></html>', file=a)
browseURL(a)

I get "1920" in my browser's window. Can R read it ?

Romain



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