[R] [External] Re: code for drawing the R logo

[Jeffrey Dick]

The OP's question might be interpreted as "draw the R logo in R",
meaning base R graphics. This interpretation excludes packages like
rsvg that use a rendering engine such as
https://wiki.gnome.org/Projects/LibRsvg (the R here is for
"Resplendent SVG", not the R language).

Thanks to Barry for describing the approach. Using Barry's email as
context, I asked Cursor to write R code to parse Rlogo.svg and make a
plot with base R graphics. It took a few debugging iterations to get a
working script, and gradients currently aren't working. The only CRAN
package used in the script is xml2.

Chat history and code are here: https://github.com/jedick/R-svg-interpreter

Code to generate Rlogo.png, assuming Rlogo.svg is in the current directory:
source("svg_interpreter.R")
savePlot("Rlogo.png")

Jeff


On Mon, Jun 30, 2025 at 4:23 PM Barry Rowlingson
<b.rowlingson using lancaster.ac.uk> wrote:
>
> The SVG isn't that complex, it defines two colour gradients (one for the R
> and one for the ring) and then draws each one using a series of cubic
> bezier curves and lines
>
> These are in <path> tags in the SVG which look like this:
>
> M361.453,485.937 C162.329,485.937 0.906,377.828 0.906,244.469
> C0.906,111....etc
>
>  M is "move to" and then "C" defines a curve, "L" defines a straight line I
> don't think any other path items are used.
>
> There's two paths, each being two parts because both the R and the ring
> have holes in them.
>
>  If you want to draw this from scratch in R code, first write (or find)
> code to draw cubic bezier curves as per the SVG spec, then extract the
> coordinates from the path attributes in the SVG then make polygons and
> shade them using the colour gradients at the start of the SVG...
>
> Barry
>
>
>
> On Sun, Jun 29, 2025 at 9:34 PM Hasan Diwan <hasan.diwan using gmail.com> wrote:
>
> > This email originated outside the University. Check before clicking links
> > or attachments.
> >
> > Rajan,
> > https://hasan.d8u.us/Rlogo.svg Best I could do in a pinch. -- H
> >
> > > On 6/27/2025 12:16 PM, Ranjan Maitra via R-help wrote:
> > > >> Hi,
> > > >>
> > > >> Is there code for drawing the R logo? https://www.r-project.org/logo/
> > > has the logo in svg and png formats, and also
> > > >> the terms of the license, but I can not find code to draw this.
> >
> > --
> > OpenPGP: https://hasan.d8u.us/openpgp.asc
> > If you wish to request my time, please do so using
> > *https://bit.ly/hd1Appointment
> > <https://bit.ly/hd1Appointment>*.
> > Si vous voudriez faire connnaisance, allez a *
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> > <https://bit.ly/hd1Appointment>*.
> >
> > <https://sks-keyservers.net/pks/lookup?op=get&search=0xFEBAD7FFD041BBA1
> > >Sent
> > from my mobile device
> > Envoye de mon portable
> >
> >         [[alternative HTML version deleted]]
> >
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