polyShade: Polygon shading

In raredd/plotr: More plotting functions and examples

Polygon shading

Description

Color or shade the area under a curve.

Usage

polyShade(
  x,
  y,
  from = -Inf,
  to = Inf,
  n = 1000,
  miny = min(y, na.rm = TRUE),
  horiz = FALSE,
  ...
)

Arguments

x, y	x- and y-values from the curve
from	a vector of x-coordinates from which to color
to	a vector of x-coordinates to which to color (same length) as from
n	tuning parameter for fitting the shading region to the curve; a lower value will result in a worse fit around the curve
miny	by default, shading will extend from the curve to min(y)
horiz	logical; if TRUE, the y-axis is assumed to be the horizontal
...	additional parameters passed to polygon; common uses are density for shading lines, col for shading color(s), border for border color, or lty for line type

See Also

http://www.fromthebottomoftheheap.net/2013/01/11/shading-regions-under-a-curve/

Examples

set.seed(1)
x <- density(c(rnorm(75), rnorm(25, 5)))

plot(x)
polyShade(x$x, x$y, -1, 2, col = 'red', border = NA)
polyShade(x$x, x$y, from = c(-Inf, 6), to = c(-2, Inf),
          col = adjustcolor('red', .3), border = NA)
polyShade(x$x, x$y, 0, 4, col = 'blue', density = 20, lty = 4,
          miny = par('usr')[1], border = NA)

## horizontal
plot(x$y, x$x, type = 'l')
polyShade(x$x, x$y, horiz = TRUE, col = 'blue')

raredd/plotr documentation built on Nov. 19, 2023, 4:09 a.m.