Specify FreeType fonts

Specify FreeType fonts for use in rgl graphics.

rglFonts(...)

Arguments

...

Device dependent font definitions for use with FreeType.

Details

FreeType fonts are specified using the rglFonts function. This function takes a vector of four filenames of TrueType font files which will be used for the four styles regular, bold, italic and bold italic. The vector is passed with a name to be used as the family name, e.g. rglFonts(sans = c("/path/to/FreeSans.ttf", ...)). In order to limit the file size, the rgl package ships with just 3 font files, for regular versions of the serif, sans and mono families. Additional free font files were available in the past from the Amaya project, though currently the rglExtrafonts function provides an easier way to register new fonts.

On Windows the system fonts are acceptable and are used when useFreeType = FALSE (the current default in r3dDefaults). Mappings to family names are controlled by the grDevices::windowsFonts() function.

Full pathnames should normally be used to specify font files. If relative paths are used, they are interpreted differently by platform. Currently Windows fonts are looked for in the Windows fonts folder, while other platforms use the current working directory.

If FreeType fonts are not used, then bitmapped fonts will be used instead. On Windows these will be based on the fonts specified using the windowsFonts function, and are resizable. Other platforms will use the default bitmapped font which is not resizable.

Bitmapped fonts have a limited number of characters supported; if any unsupported characters are used, an error will be thrown.

Value

the current set of font definitions.

See also

text3d

Examples

if (FALSE) {
# These FreeType fonts are available from the Amaya project, and are not shipped
# with rgl.  You would normally install them to the rgl/fonts directory
# and use fully qualified pathnames, e.g. 
# system.file("fonts/FreeSerif.ttf", package = "rgl")

rglFonts(serif = c("FreeSerif.ttf", "FreeSerifBold.ttf", "FreeSerifItalic.ttf",
                 "FreeSerifBoldItalic.ttf"),
         sans  = c("FreeSans.ttf", "FreeSansBold.ttf", "FreeSansOblique.ttf",
                 "FreeSansBoldOblique.ttf"),
         mono  = c("FreeMono.ttf", "FreeMonoBold.ttf", "FreeMonoOblique.ttf",
                 "FreeMonoBoldOblique.ttf"),
         symbol= c("ESSTIX10.TTF", "ESSTIX12.TTF", "ESSTIX9_.TTF", 
                 "ESSTIX11.TTF"))
}