Re: [Rd] [R] x11() graphic device, displaying raster

From: Uwe Ligges <ligges_at_statistik.tu-dortmund.de>
Date: Wed, 25 Jan 2012 16:51:28 +0100

On 25.01.2012 16:44, Johannes Radinger wrote:
>>>>>>> Hello,
>>>>>>>
>>>>>>> I am wondering about the X11() graphic device on Windows.
>>>>>>> I try to plot a raster image but nothing gets displayed. I
>>>>>>> found some pages where it is mentioned that x11() not
>>>>>>> always supports raster rendering.
>>>>>>> Is there any add on for x11, any update or any R-package
>>>>>>> which solves that displaying problem in Windows?
>>>>>>>
>>>>>>> What I try to test it is an example from the
>>>>>>> package {raster}:
>>>>>>>
>>>>>>> library(raster)
>>>>>>> DEU_alt<- getData("alt", country="DEU", mask=TRUE)
>>>>>>> x11()
>>>>>>> plot(DEU_alt,axes=TRUE)
>>>>>>>
>>>>>>> best regards,
>>>>>>>
>>>>>>> /johannes
>>>>>>
>>>>>> Try an R version that is recent - it works for me.
>>>>>>
>>>>>> Uwe Ligges
>>>>>
>>>>> I first tried it with R 2.13.2 and raster version 1.9-64

>>>> (16-January-2012).

>>>>> Now I also installed the most recent version R 2.14.1 (Platform:
>>>> i386-pc-mingw32/i386 (32-bit)) and raster version 1.9-64
>> (16-January-2012).

>>>>>
>>>>> But in both cases no success. X11() opens and draws the axis and the
>>>>> border for the scale but no raster...
>>>>
>>>> I do not really understand why you are using x11(). The Windows device
>>>> is called windows() and you actually do not need to open it, since plot
>>>> opens it anyway. Or are you under cygwin (which is not really Windows)?
>>>> If not: Which version of Windows is this?
>>>
>>> Of course I do not need to open a graphic device (as you said it is open
>> when calling plot). I just wanted to make it reproducable as e.g. Mac OS X
>> opens Quartz as a standard device when calling plot on my Mac machine.
>>>
>>> So far as I understand the help are "all the devices (X11(), x11() and
>> windows() implemented as variants of the same device". Thus it makes no
>> difference if I call x11() or windows() or if 'plot' opens the device
>> automatically. In all cases there is no raster displayed.
>>>
>>> Just some additional information from the 'grDevices' package:
>>>> library(grDevices)
>>>> dev.capabilities()
>>> $semiTransparency
>>> [1] TRUE
>>>
>>> $transparentBackground
>>> [1] "fully"
>>>
>>> $rasterImage
>>> [1] "yes"
>>>
>>> $capture
>>> [1] TRUE
>>>
>>> $locator
>>> [1] TRUE
>>>
>>> $events
>>> [1] "MouseDown" "MouseMove" "MouseUp"   "Keybd"
>>>
>>> I am running R via the standard RGUI (so no Eclipse, Rtinn etc.). The
>> machine I am working on is Windows 2008 Server Enterprise (Version 6.0) which
>> I am remotely accessing from a ThinClient with WindowsXP-embedded.
>>> This is the standard configuration of our institution. Maybe that
>> configuration with ThinClients is a reason? But what should I ask our admin? What
>> should he check etc?
>>
>> Yes! the remotesoftware is probably unable to send the rasterimage!
>>
>> See ?image:
>>
>> "Problems with the rendering of raster images have been reported using
>> ‘windows()’ devices under Remote Desktop."
>>
>
>
> I shifted this corresponce over to the more suitable r-devel-list.
>
> @Uwe Ligges: Thank you for that usefull but very disappointing message. So it seems that these are know problems caused by the RemoteDesktop Setup.
>
> I just wanted to know if the source of the problem is caused by the R-code or the RemoteDesktop Software. If it is caused by the RemoteDesktop (as you stated)..are there any settings which need to be set by our IT-admin? Or is there anything I/we can do to solve that problem?

Since it is correctly displayed locally, we can assume this is a problem of the RDP connection. We do not know of a setting that enables the feature via RemoteDesktop, but if you know any, please let us know and we will include this in the documentation as a hint for others.

Best,
Uwe Ligges

>
> Best regards,
>
> Johannes
>
>

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