ramp_colours: Apply partial colour ramps

In ggdist: Visualizations of Distributions and Uncertainty

Apply partial colour ramps

Description

Given vectors of colours and partial_colour_ramps, ramps the colours according to the parameters of the partial colour ramps, returning a vector of the same length as the inputs giving the transformed (ramped) colours.

Usage

ramp_colours(colour, ramp)

Arguments

colour	<character> Vector of colours to ramp to.
ramp	<partial_colour_ramp> Vector of colour ramps (same length as colour) giving the colour to ramp from and the amount to ramp.

Details

Takes vectors of colours and partial_colour_ramps and produces colours by interpolating between each from colour and the target colour the specified amount (where amount and from are the corresponding fields of the ramp).

For example, to add support for the fill_ramp aesthetic to a geometry, this line could be used inside the draw_group() or draw_panel() method of a geom:

data$fill = ramp_colours(data$fill, data$fill_ramp)

Value

A character vector of colours.

Author(s)

Matthew Kay

See Also

Other colour ramp functions: guide_rampbar(), partial_colour_ramp(), scale_colour_ramp

Examples

pcr = partial_colour_ramp(c(0, 0.25, 0.75, 1), "red")
pcr

ramp_colours("blue", pcr)

ggdist documentation built on June 8, 2025, 10:59 a.m.