font_add | R Documentation |
The two versions of this function are equivalent, but the "underscore" naming is preferred.
This function registers new font families that can be used by package showtext and the SWF device in package R2SWF. Currently supported formats include but not limited to TrueType fonts(*.ttf, *.ttc) and OpenType fonts(*.otf).
font_add(
family,
regular,
bold = NULL,
italic = NULL,
bolditalic = NULL,
symbol = NULL
)
font.add(
family,
regular,
bold = NULL,
italic = NULL,
bolditalic = NULL,
symbol = NULL
)
family |
a character string of maximum 200-byte size, indicating the family name of the font. See "Details" for further explanation. |
regular |
path of the font file for "regular" font face. This argument must be specified as a character string and cannot be missing. |
bold |
path of the font file for "bold" font face.
If it is |
italic , bolditalic , symbol |
ditto |
In R graphics device, there are two parameters combined together
to select a font to show text. par("family")
is a character
string giving a name to a series of font faces. Here
series implies that there may be different fonts with the
same family name, and actually they are distinguished by the parameter
par("font")
, indicating whether it is regular, bold, or italic,
etc. In R, par("font")
is an integer from 1 to 5 representing
regular, bold, italic, bold italic, and symbol, respectively.
In sysfonts package, there are three default font families, sans, serif, and mono,
each with five font faces as mentioned above. If one wants
to use other font families, the function font_add()
needs to be called
to register new fonts. Note that the family
argument in this function can be
an arbitrary string that does not need to be the real font name. The specified
family name will be used in functions like par(family = "myfont")
and text("Some text", family = "myfont")
. The Examples section
shows a complete demonstration of the usage.
To find the font file of argument regular
(and the same for
other font faces), this function will first check the existence
of the specified path. If not found, file will be searched in the
directories returned by font_paths()
in turn. If the
file cannot be found in any of the locations,
an error will be issued.
A character vector (invisible) of currently available font family names.
Yixuan Qiu <https://statr.me/>
See par()
for explanation of
the parameters family
and font
.
## Not run:
## Example: download the font file of WenQuanYi Micro Hei,
## add it to SWF device, and use it to draw text in swf().
## WenQuanYi Micro Hei is an open source and high quality
## Chinese (and CJKV) font.
wd = setwd(tempdir())
ft.url = "http://sourceforge.net/projects/wqy/files/wqy-microhei"
ft.url = paste(ft.url, "0.2.0-beta/wqy-microhei-0.2.0-beta.tar.gz",
sep = "/")
download.file(ft.url, basename(ft.url))
## Extract and add the directory to search path
untar(basename(ft.url), compressed = "gzip")
font_paths("wqy-microhei")
## Register this font file and assign the family name "wqy"
## Other font faces will be the same with regular by default
font_add("wqy", regular = "wqy-microhei.ttc")
## A more concise way to add font is to give the path directly,
## without calling font_paths()
# font_add("wqy", "wqy-microhei/wqy-microhei.ttc")
## List available font families
font_families()
if(require(R2SWF))
{
## Now it shows that we can use the family "wqy" in swf()
swf("testfont.swf")
## Select font family globally
op = par(family = "serif", font.lab = 2)
## Inline selecting font
plot(1, type = "n")
text(1, 1, intToUtf8(c(20013, 25991)), family = "wqy", font = 1, cex = 2)
dev.off()
swf2html("testfont.swf")
}
setwd(wd)
## End(Not run)
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