add.alpha
A function to add alpha levels to RGB colors.
add.alpha(col,alpha)
col |
color from colors() |
alpha |
alpha level (between 0 and 1) |
This code was created by Markus Gesmann. Derek Beaton included the code in prettyGraphs because it is a versatile function and used in prettyGraphs. See: https://magesblog.com/post/2013-04-30-how-to-change-alpha-value-of-colours-in/
Markus Gesmann
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