CairoFonts: Set the fonts used for all Cairo graphics devices.

Description

CairoFonts initializes the fonts used for Cairo graphics devices.

Usage

CairoFonts(
	regular="Helvetica:style=Regular",
	bold="Helvetica:style=Bold",
	italic="Helvetica:style=Italic",
	bolditalic="Helvetica:style=Bold Italic,BoldItalic",
	symbol="Symbol", usePUA=TRUE
)

Arguments

regular: character; fontconfig pattern for the 'plain text' font.
bold: character; fontconfig pattern for the 'bold face' font.
italic: character; fontconfig pattern for the 'italic' font.
bolditalic: character; fontconfig pattern for the 'bold italic' font.
symbol: character; fontconfig pattern for the 'symbol' font.
usePUA: logical; if FALSE then symbols are using regular Unicode code points (supported by regular fonts), otherwise Private Unicode Area (PUA) of symbols is used (typically better propulated by specialized symbol fonts). R 4.0.0 or higher is required for usePUA=FALSE.

Known issues

This function is only available when the cairo graphics library is configured with FreeType and Fontcofig support.
R math symbols are supported, but require a "Symbol" font with the Adobe Symbol Encoding unless usePUA=FALSE is used (available in R 4.0.0 or higher only).

Details

This function sets the fonts for Cairo graphics devices globally; previously opened Cairo graphics devices will also use these fonts. The argument names correspond to the five values of the graphical parameter 'font', i.e. regular is 1, bold is 2, italic is 3, etc.

For an explanation of fontconfig patterns, see CairoFontMatch.

Examples

Run this code

if (FALSE) {
#
# The following fontconfig patterns define the free truetype fonts 
# available in the debian package 'ttf-freefont'.
# 
# Freesans is very similar to Helvetica
CairoFonts(
	regular="FreeSans:style=Medium",
	bold="FreeSans:style=Bold",
	italic="FreeSans:style=Oblique",
	bolditalic="FreeSans:style=BoldOblique"
)
}