These functions assist in calling particular parts of a theme's palette.
For example, ag_base() will return the current theme's base or background
color, and ag_highlight() will return the color used in that theme to
highlight one or more nodes, lines, or such.
Using palettes that are high contrast, aesthetically pleasing, and institutionally or thematically consistent is not without its challenges.
Usage
ag_base()
ag_highlight()
ag_positive()
ag_negative()
ag_qualitative(number)
ag_sequential(number)
ag_divergent(number)
ag_font()Colour blindness
The default palettes are designed to be colour-blind friendly.
There are different types of colour-blindness.
The most common type, red-green colour-blindness,
finds it difficult to distinguish between the red and green hues used
in the rainbow palette,
for instance.
Fortunately there are a range of palettes that function fairly well for
those who are color-blind.
These include the viridis
palette,
and the ColorBrewer palettes (included in the RColorBrewer package).
The default palettes in {autograph} are designed to be colour-blind
friendly, but users should always check that their visualisations serve
their intended audience.