partial_colour_ramp function

Partial colour ramp (datatype)

A representation of a partial ramp between two colours: the origin colour (from) and the distance from the origin colour to the target colour (amount, a value between 0 and 1). The target colour of the ramp can be filled in later using ramp_colours(), producing a colour.

partial_colour_ramp(amount = double(), from = "white")

Arguments

• amount: Numeric vector between 0 and 1 giving amounts to ramp the colour. 0 corresponds to the colour from.
• from: Character vector giving colours to ramp from.

Returns

A vctrs::rcrd of class "ggdist_partial_colour_ramp" with fields "amount" and "from".

Details

This datatype is used by scale_colour_ramp to create ramped colours in ggdist geoms. It is a vctrs::rcrd datatype with two fields: "amount", the amount to ramp, and "from", the colour to ramp from.

Colour ramps can be applied (i.e. translated into colours) using ramp_colours(), which can be used with partial_colour_ramp()

to implement geoms that make use of colour_ramp or fill_ramp scales.

Examples

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

ramp_colours("blue", pcr)

See Also

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

Author(s)

Matthew Kay