.get_alpha_from_hex_colour

RGB colours can be encoded as hexadecimal values, as for example internally used by <code>ggplot2</code>.
For this, the numerical RGB values are mapped from their 0-255 value range to two-character hex-values.
This yields a string in the form of '#RRGGBB'. Additionally, a fourth optional block can be present encoding
the alpha transparency of the colour. This extends the string to '#RRGGBBAA'.
This function takes such a string as input for <code>hex_colour</code>, extracts the 'AA' part and returns the
numerical representation if it.

internal

To enable fit-for-purpose, reusable clinical and medical
research focused visualizations and tables with sensible defaults and
based on graphical principles as described in: "Vandemeulebroecke et
al. (2018)" <doi:10.1002/pst.1912>, "Vandemeulebroecke et al. (2019)"
<doi:10.1002/psp4.12455>, and "Morris et al. (2019)"
<doi:10.1136/bmjopen-2019-030215>.

Mark Baillie

visR

Clinical Graphs and Tables Adhering to Graphical Principles

Diego Saldana

Charlotta Fruechtenicht

Marc Vandemeulebroecke

Thanos Siadimas

Pawel Kawski

Steven Haesendonckx

James Black

Pelagia Alexandra Papadopoulou

Tim Treis

Rebecca Albrecht

Ardalan Mirshani

Daniel D. Sjoberg

.get_alpha_from_hex_colour function

<dl><dt>hex_colour</dt>
<dd>A string in the format '#RRGGBBAA'</dd></dl>

Arguments

Extract the numerical alpha representation of #RRGGBBAA colour — .get_alpha_from_hex_colour

<dl>

<dt>hex_colour</dt>
<dd>A string in the format '#RRGGBBAA'</dd>

</dl>

Extract the numerical alpha representation of #RRGGBBAA colour

.get_alpha_from_hex_colour: Extract the numerical alpha representation of #RRGGBBAA colour

Description

Usage

Value

Arguments