[R] Trying to Learn Details of Grid Graphics, Help Page Errors

[Paul Murrell]

Hi

The first place you should probably start (given where you are right 
now) is this R Journal article ...

https://journal.r-project.org/archive/2013/RJ-2013-035/RJ-2013-035.pdf

In brief, the drawDetails() function has been (almost entirely) 
superceded by the makeContent() function.

The best overall reference is probably the "R Graphics" book (3rd 
edition, chapts 6, 7, & 8).  Unfortunately, because the first edition 
came out in 2005, that is an Olde Worlde pay-for-a-print-version book 
(and probably will be until something stupid like 50 years after I have 
gone).  Or maybe you are lucky and work for a first-world university 
that has purchased access to an electronic version.

Thanks for pointing out the problems with the drawDetails() help page; I 
will need to fix that.

Paul

On 9/23/2021 2:21 AM, bill using denney.ws wrote:
> Hello,
> 
> 
> 
> I'm trying to learn the details of grid graphics. Specifically, I'm trying
> to create a check that will give a warning or error if text goes outside of
> the visible plot area. (See
> https://github.com/tidyverse/ggplot2/issues/3282 
> <https://github.com/tidyverse/ggplot2/issues/3282> 
> for an example of what I
> mean.)
> 
> 
> 
> In my digging, I think that the right way to do this will be to add either a
> drawDetails, preDrawDetails, or postDrawDetails method for the "text" class.
> My questions are: Is that the right way to do it or should I be looking
> elsewhere? Or, is there already a way to do this?
> 
> 
> 
> As I was digging in and trying to learn how to do it, I tried to follow some
> of the examples from the help page for drawDetails (?drawDetails). But, the
> suggested functions to review do not exist. Specifically, I wanted to look
> at grid:::preDrawDetails.frame mentioned in the second paragraph of the
> Details section of the help page, and it doesn't exist.
> grid:::drawDetails.xaxis and grid:::postDrawDetails.frame also do not exist
> (mentioned in the next two paragraphs).
> 
> 
> 
> I would try to make patch, but there is no preDrawDetails or postDrawDetails
> method in grid that has any content. For drawDetails, there are many
> choices, and since I'm learning, I'm not sure which would be the best to use
> as an example.
> 
> 
> 
> Thanks,
> 
> 
> 
> Bill
> 
> 
> [[alternative HTML version deleted]]
> 
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-- 
Dr Paul Murrell
Department of Statistics
The University of Auckland
Private Bag 92019
Auckland
New Zealand
64 9 3737599 x85392
paul using stat.auckland.ac.nz
http://www.stat.auckland.ac.nz/~paul/