Since I'm working with Paul on the glyph changes to the R graphics engine I'm
quite interested in this so I had the idea to take out the guts from my Cairo
package into a self-contained C code. Your request is good to bump is up on my
stack. I already have code that draws text into OpenGL textur
I'm somewhat aware of how tricky it all is. For now I'm going to do it
in R (usng textshaping for layout and base graphics on the
ragg::agg_capture device to draw to the bitmap). I'll avoid allowing
changes to happen in the C++ code.
Eventually I'll see if I can translate the code into C++.
Duncan,
drawing text is one of the most complicated things you can do, so it really
depends how for you want to go. You can do it badly with a simple cairo
show_text API. The steps involved in doing it properly are detecting the
direction of the language, finding fonts, finding glyphs (resolvin
I am in the process of updating the rgl package. One thing I'd like to
do is to change text support in it when using OpenGL to display to be
more like the way text is drawn in WebGL displays (i.e. the ones
rglwidget() produces).
Currently in R, rgl uses the FTGL library to draw text. That li
