rgl.texts(x, y = NULL, z = NULL, text, adj = 0.5, justify, family = par3d("family"), font = par3d("font"),
cex = par3d("cex"), useFreeType=par3d("useFreeType"), ...)
text3d(x, y = NULL, z = NULL, texts, adj = 0.5, justify, ...)
texts3d(x, y = NULL, z = NULL, texts, adj = 0.5, justify, ...)
rglFonts(...)xyz.coords
for details."left", "right",
"center".rgl.texts, material properties; see rgl.material for details.
In rglFonts, device dependent font definitions for use with FreeType.
In the rglFonts returns the current set of font definitions.
family, font, cex,
and useFreeType arguments. Defaults for the currently active
device may be set using par3d, or for future devices
using r3dDefaults.The family specification is the same as for standard graphics, i.e.
families c("serif", "sans", "mono", "symbol") are normally
available, but users may add additional families. font numbers
are restricted to the range 1 to 4 for standard, bold, italic and bold italic
respectively; with font 5 recoded as family "symbol" font 1.
Using an unrecognized value for "family" will result in
the system standard font as used in rgl up to version 0.76. That font
is not resizable and font values are ignored.
If useFreeType is TRUE, then rgl will use the FreeType
anti-aliased fonts for drawing. This is generally desirable, and it is the
default if rgl was built to support FreeType.
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, rgl ships with just 3 font files, for
regular versions of the serif, sans and mono families.
Additional free font files are available from the Amaya project at
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
#ifdef windows
windowsFonts
#endif
#ifndef windows
windowsFonts
#endif
function, and are resizable.
Other platforms will use the default bitmapped font which is not
resizeable. Currently MacOSX defaults to the bitmapped font, as
our font library appears unable to read fonts properly on that platform.
adj parameter determines the position of the text relative to the
specified coordinate. Use adj = c(0,0) to place the left bottom corner at
(x,y,z), adj = c(0.5, 0.5) to center the text there, and adj = c(1,1)
to put the right top corner there. The optional second coordinate for vertical
adjustment defaults to 0.5. Placement is done using the "advance" of
the string and the "ascent" of the font relative to the baseline, when these metrics
are known.text3d and texts3d draw text using the r3d
conventions. These are synonyms; the former is singular to be
consistent with the classic 2-D graphics functions, and the latter is
plural to be consistent with all the other graphics primitives. Take
your choice!
If any coordinate or text is NA, that text is not plotted.
r3dopen3d()
famnum <- rep(1:4, 8)
family <- c("serif", "sans", "mono", "symbol")[famnum]
font <- rep(rep(1:4, each=4), 2)
cex <- rep(1:2, each=16)
text3d(font, cex, famnum, text=paste(family, font),adj = 0.5,
color="blue", family=family, font=font, cex=cex)
# 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"))Run the code above in your browser using DataLab