From paul at stat.auckland.ac.nz  Sun Nov 13 20:55:20 2016
From: paul at stat.auckland.ac.nz (Paul Murrell)
Date: Mon, 14 Nov 2016 08:55:20 +1300
Subject: [Rd] getGraphicsEvent() alternative for cairo graphics device?
In-Reply-To: <20161112200028.GD24681@ofb.net>
References: <CAN_GHySs42vK5U1xZYP8h7ZPdFyOcHnEZK4Sn91e7htv=7E54A@mail.gmail.com>
	<20160725191747.GB18530@ofb.net> <57968357.2030509@stat.auckland.ac.nz>
	<20161112200028.GD24681@ofb.net>
Message-ID: <2e6f0306-da86-211a-05dd-aff3d744df40@stat.auckland.ac.nz>

Hi

The current status is that I am keen for people to contribute some 
testing code (see https://bugs.r-project.org/bugzilla/show_bug.cgi?id=16951)

There were also some getGraphicsEvent() changes/fixes suggested by 
Richard Bodewits (cc'ed), for which I am also seeking test code.

Paul

On 13/11/16 09:00, frederik at ofb.net wrote:
> Hi Paul,
>
> Just checking in to see what the status is.
>
> From my perspective it seems logical to split off X11 into a separate
> package, so development can proceed at a reasonable rate, but I
> haven't yet tried to see if that's even possible.
>
> Thanks,
>
> Frederick
>
> On Tue, Jul 26, 2016 at 09:23:35AM +1200, Paul Murrell wrote:
>> Hi
>>
>> Taking a look at those patches is now on my todo list, so I may be in touch
>> with both of you at some point to request some testing.
>>
>> Paul
>>
>> On 26/07/16 07:17, frederik at ofb.net wrote:
>>> Dear Daniel Greenidge,
>>>
>>> To enable getGraphicsEvent on Cairo, you have two patches to choose
>>> from:
>>>
>>> https://bugs.r-project.org/bugzilla/show_bug.cgi?id=14364
>>> https://bugs.r-project.org/bugzilla/show_bug.cgi?id=16951
>>>
>>> The second one is by me, and the first one is from five years ago by
>>> Hugo Mildenberger.
>>>
>>> Both patches are very simple, they move some lines enabling
>>> getGrahpicsEvent outside of a if(!cairo) statement. My patch also adds
>>> the ability to execute code (e.g. for animation) while the interface
>>> is idle.
>>>
>>> Top guy Duncan Murdoch has expressed that he doesn't have time to work
>>> on applying these patches, and I haven't had any responses from the
>>> rest of the R Core Team. I was thinking that perhaps your best bet is
>>> to try to create a package called e.g. "X11-fixes" which people can
>>> use to get a better X11 library (there is also a bug waiting to be
>>> fixed from 2001:
>>> https://bugs.r-project.org/bugzilla/show_bug.cgi?id=16702).
>>>
>>> I don't know if CRAN would accept such a package, or if you'd have to
>>> distribute it via GitHub, but R has excellent tools to facilitate the
>>> distribution of code via packages. Whether the R kernel exports enough
>>> functions to allow a package to take over event handling, I'm not
>>> sure. I was intending to look more into the details of this
>>> possibility but haven't had time.
>>>
>>> Best wishes,
>>>
>>> Frederick
>>>
>>> On Mon, Jul 25, 2016 at 02:15:59PM -0400, Daniel Greenidge wrote:
>>>> Hi all,
>>>>
>>>> I'm writing an interactive plotting function for viewing fMRI
>>>> datasets. Currently, I get keypresses using
>>>> grDevices::getGraphicsEvent().
>>>>
>>>> Unfortunately getGraphicsEvent() only supports the X11(type="Xlib")
>>>> graphics device on Unix systems. The Xlib device doesn't support
>>>> buffering (i.e. dev.hold() and dev.flush()), so redrawing the plots
>>>> causes lots of flickering.
>>>>
>>>> Is there a way to get keypresses while using the cairo graphics
>>>> device? Alternatively, is there a way to prevent flickering with the
>>>> Xlib graphics device?
>>>>
>>>> Best,
>>>> Daniel Greenidge
>>>>
>>>> ______________________________________________
>>>> R-devel at r-project.org mailing list
>>>> https://stat.ethz.ch/mailman/listinfo/r-devel
>>>>
>>>
>>> ______________________________________________
>>> R-devel at r-project.org mailing list
>>> https://stat.ethz.ch/mailman/listinfo/r-devel
>>>
>>
>> --
>> Dr Paul Murrell
>> Department of Statistics
>> The University of Auckland
>> Private Bag 92019
>> Auckland
>> New Zealand
>> 64 9 3737599 x85392
>> paul at stat.auckland.ac.nz
>> http://www.stat.auckland.ac.nz/~paul/
>>

-- 
Dr Paul Murrell
Department of Statistics
The University of Auckland
Private Bag 92019
Auckland
New Zealand
64 9 3737599 x85392
paul at stat.auckland.ac.nz
http://www.stat.auckland.ac.nz/~paul/



[Rd] getGraphicsEvent() alternative for cairo graphics device?
Paul Murrell