rglExtrafonts.RdThis function uses the extrafont package to help register system fonts for use with FreeType in rgl.
rglExtrafonts(..., quiet = TRUE)The extrafont
package collects information on
installed fonts from the system. When you first
install extrafont, or after new fonts have been installed on your
system, run extrafont::font_import() to build
its database of system fonts.
Fonts can be installed in rgl using
rglExtrafonts(rglname = familyname) or rglExtrafonts(familyname). In this call
familyname is a vector of family names to look
for in the extrafont database using extrafont::choose_font(familyname); the first one found
will be registered with rgl. The optional name rglname will also be usable to refer to the font family.
If none of the given family names is found, no change will be made to the registered fonts in rgl.
During startup, rgl detects whether extrafont
is installed, and if so runs
rglExtrafonts(sans = c("Helvetica", "Arial"),
serif = c("Times", "Times New Roman"),
mono = c("Courier", "Courier New"))
to attempt to set up the default fonts.
Fonts found by extrafont can also be used in some other graphics devices besides rgl; see the extrafont documentation for details.
Each font in a display needs a unique rgl name; if the associated font for a given name is changed, all previously plotted text will also change.
Currently rglwidget displays will not
respect the new definitions.
Invisibly returns a vector giving the rgl name and the family name for the newly installed font.
if (requireNamespace("extrafont") && !in_pkgdown_example()) {
open3d()
text3d(1,1,1, "Default", family = "sans", cex = 2)
# Attempt to register new sans-serif font:
newfamily <- rglExtrafonts(newsans = c("Comic Sans MS", "Impact",
"Verdana", "Tahoma"))
text3d(2,2,2, newfamily, family = "newsans", cex = 2)
}