Package index • gdtools

Text measurement

Compute text width, ascent and descent using Cairo, independently of any graphic device. strings_sizes() is the recommended entry point.

strings_sizes(): Compute strings sizes

Font set

Create a font set that bundles registration, HTML dependencies and family names in one step. Use font_google() or font_liberation() to describe each font role, then pass the result to girafe(), dsvg() or ggplot2 themes. font_set_liberation() is a ready-made set that works offline on any platform.

font_set(): Create a font set
font_set_liberation(): Liberation font set
font_set_auto(): Automatic font set
font_google(): Google Font specification
font_liberation(): Liberation Font specification

Google Fonts

Lower-level helpers to download, cache and register individual fonts from Google Fonts.

register_gfont(): Register a 'Google Font'
gfontHtmlDependency(): 'Google Font' HTML dependency
addGFontHtmlDependency(): Use a Font in Shiny or Markdown
installed_gfonts(): List installed 'Google Fonts'
install_gfont_script(): Shell command to install a font from 'Google Fonts'

Liberation Fonts

Lower-level helpers to register and embed the bundled Liberation fonts (Sans, Serif, Mono) individually.

register_liberationsans(): Register font 'Liberation Sans'
register_liberationserif(): Register font 'Liberation Serif'
register_liberationmono(): Register font 'Liberation Mono'
liberationsansHtmlDependency(): 'Liberation Sans' Font HTML dependency
liberationserifHtmlDependency(): 'Liberation Serif' Font HTML dependency
liberationmonoHtmlDependency(): 'Liberation Mono' Font HTML dependency

Font discovery

Query available fonts on the system. font_family_exists() checks whether a font is available, sys_fonts() lists all known fonts, and match_family() finds the best match for a given name.

font_family_exists(): Check if font family exists.
sys_fonts(): List fonts for 'systemfonts'.

Font cache

Manage the local directory where downloaded font files are stored. The cache location can be customised with the GDTOOLS_CACHE_DIR environment variable or R option.

fonts_cache_dir() rm_fonts_cache() init_fonts_cache(): Manage Font Working Directory
dummy_setup(): Set up a temporary font cache

C library versions

Return the runtime version of the Cairo and FreeType libraries linked to the package.

version_freetype() version_cairo(): Version numbers of C libraries