Making my own graphics device
On Aug 17, 2014, at 2:35 PM, Paul Murrell wrote:
Hi On 08/18/14 07:58, Thomas Levine wrote:
I want to make my own graphics device am thus looking for documentation about graphics devices. The only thing I've found so far is these directions for making graphics devices with the RGraphicsDevice package. http://www.omegahat.org/RGraphicsDevice/
That is certainly a good way to get something going quickly at least (I used it just the other day and had something up and running in under an hour, based on the inst/examples/SVG/svgDev.R example)
Could someone point me to any other resources? Or just some documentation about how to edit base R? If I don't get anything, I'm just going to stare at the grDevices section of the R source code (src/library/grDevices/src) until I figure out how it works.
The "canonical" approach is to look at the source code for one of the built-in devices in the R source code and change it to do what you want (e.g., src/modules/X11/devX11.c). The file src/include/R_ext/GraphicsDevice.h has comments describing how the graphics device should be set up. See the RSvgDevice package for an example of a device implemented in a package.
It may be useful to look at existing interfaces to an HPGL device in other graphics applications. One such application is xgraph and here is the C code for one implementation: http://xgraph.sourcearchive.com/documentation/12.1-3/hpgl_8c-source.html The other option might be to enlist an external program such as GNUPLOT that has an HPGL output and use it as a driver to which you send an image in a file format that R can produce.
David. > > Paul > >> In case you're curious, I want to make a graphics device >> that saves the graph in Hewlett-Packard Graphics Language. >> https://en.wikipedia.org/wiki/HPGL >> >> Thanks >> >> Tom >> >> ______________________________________________ >> R-help at r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html >> and provide commented, minimal, self-contained, reproducible code. >> > > -- > 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/ > > ______________________________________________ > R-help at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. David Winsemius Alameda, CA, USA