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

Paul Murrell p@u| @end|ng |rom @t@t@@uck|@nd@@c@nz
Wed Sep 22 22:49:43 CEST 2021


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


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superceded by the makeContent() function.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.


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
New Zealand
64 9 3737599 x85392
paul using stat.auckland.ac.nz

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