Create hatch area of one polygon

polygon.fullhatch(
  x,
  y = NULL,
  density,
  angle,
  ..debug.hatch = FALSE,
  fillOddEven = FALSE,
  ...
)

Arguments

x, y: vectors containing the coordinates of the vertices of the polygon.
density: the density of shading lines, in lines per inch. The default value of NULL means that no shading lines are drawn. A zero value of density means no shading nor filling whereas negative values and NA suppress shading (and so allow color filling).
angle: the slope of shading lines, given as an angle in degrees (counter-clockwise).
..debug.hatch: for drawing when debugging function
fillOddEven: logical controlling the polygon shading mode: see below for details. Default FALSE.
...: graphical parameters such as xpd, lend, ljoin and lmitre can be given as arguments.

if (FALSE) {
res <- polygon.fullhatch(x, density = 10, angle = 45)
arrows(res$lx1, res$ly1, res$lx2, res$ly2, col = "red", code = 0)
}