Creates different alpha values along a vector — atl_alpha

Copied from https://github.com/mpio-be/windR

Usage

atl_alpha_along(x, head = 20, skew = -2)

Arguments

x: Vector along which alpha is created
head: Numeric parameter influencing the lenght of the head
skew: Numeric parameter influencing the skew of alpha

Value

Numeric verctor with different alpha values

Author

Mihai Valcu & Johannes Krietsch

Examples

library(ggplot2)
d <- data.frame(
  x = 1:100, y = 1:100,
  a = atl_alpha_along(1:100, head = 20, skew = -2)
)
bm <- ggplot(d, aes(x, y))
bm + geom_path(linewidth = 10)

bm + geom_path(linewidth = 10, alpha = d$a, lineend = "round")