scale_alpha

0th

Percentile

Alpha transparency scales

Alpha-transparency scales are not tremendously useful, but can be a convenient way to visually down-weight less important observations. scale_alpha is an alias for scale_alpha_continuous since that is the most common use of alpha, and it saves a bit of typing.

Usage
scale_alpha(..., range = c(0.1, 1))
scale_alpha_continuous(..., range = c(0.1, 1))
scale_alpha_discrete(..., range = c(0.1, 1))
Arguments
...
Other arguments passed on to continuous_scale or discrete_scale as appropriate, to control name, limits, breaks, labels and so forth.
range
Output range of alpha values. Must lie between 0 and 1.
See Also

Other colour scales: scale_colour_brewer, scale_colour_gradient, scale_colour_grey, scale_colour_hue

Aliases
  • scale_alpha
  • scale_alpha_continuous
  • scale_alpha_discrete
Examples
library(ggplot2) p <- ggplot(mpg, aes(displ, hwy)) + geom_point(aes(alpha = year)) p p + scale_alpha("cylinders") p + scale_alpha(range = c(0.4, 0.8))
Documentation reproduced from package ggplot2, version 2.2.1, License: GPL-2 | file LICENSE

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