[R] single character in R, and how to manipulate it

[Paul Murrell]

Hi

 From R 4.2.0, mirroring is possible (if a little awkward) ...

library(grid)
grid.newpage()
grid.define(textGrob("R"), name="r")
grid.use("r",
          transform=function(group, device)
              viewportTransform(group, flip=groupFlip(flipX=TRUE)))

... although only on pdf() and Cairo-based devices.

Paul

On 31/03/23 13:14, Jim Lemon wrote:
> Also see the "arctext" function in the plotrix package.
> 
> Jim
> 
> On Fri, Mar 31, 2023 at 11:12 AM Jim Lemon <drjimlemon using gmail.com> wrote:
>  >
>  > Hi Jinsong,
>  > Maybe "srt" will do what you want. As you noted non-orthogonal
>  > rotations may not work on some devices. You may be able to download
>  > mirror fonts from places like fontmirror.com, but it more complicated.
>  >
>  > Jim
>  >
>  > On Thu, Mar 30, 2023 at 7:25 PM Jinsong Zhao <jszhao using yeah.net> wrote:
>  > >
>  > > Hi there,
>  > >
>  > >
>  > > I just noticed that "crt" is a graphical parameter, which is stated 
> as follows in the help page of "par":
>  > > A numerical value specifying (in degrees) how single characters 
> should be rotated. It is unwise to expect values other than multiples of 
> 90 to work...
>  > >
>  > >
>  > > However, I did not find any code example to demo the usage of 
> "crt", and even know how to present a *single character* in R. It seems 
> that R treats "A" as a string. If I wanted to rotated it in a plot, I 
> could use "text" function with "srt" argument. But how to use "crt"?
>  > >
>  > >
>  > > Another related question, how to mirror a character in R plot? For 
> example, the mirror of "R" is something like "Я".
>  > >
>  > >
>  > > Any hint? Thanks in advance.
>  > >
>  > >
>  > > Best,
>  > > Jinsong
>  > > [[alternative HTML version deleted]]
>  > >
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>  > > and provide commented, minimal, self-contained, reproducible code.
> 
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> <http://www.R-project.org/posting-guide.html>
> and provide commented, minimal, self-contained, reproducible code.

-- 
Dr Paul Murrell
Te Kura Tatauranga | Department of Statistics
Waipapa Taumata Rau | The University of Auckland
Private Bag 92019, Auckland 1142, New Zealand
64 9 3737599 x85392
paul using stat.auckland.ac.nz
www.stat.auckland.ac.nz/~paul/