npolygon: n-sided polygons Calculate the coordinates for an nsided...

In netplot: Beautiful Graph Drawing

n-sided polygons Calculate the coordinates for an nsided polygon

Description

n-sided polygons Calculate the coordinates for an nsided polygon

Usage

npolygon(x = 0, y = 0, n = 6L, r = 1, d = 2 * pi/(n)/2)

Arguments

x, y	Numeric scalar. Origin of the polygon.
n	Integer scalar. Number of sides.
r	Numeric scalar. Radious of the polygon.
d	Numeric scalar. Starting degree in radians.

Value

A two column matrix with the coordinates to draw a n sided polygon.

Examples

graphics.off()
oldpar <- par(no.readonly = TRUE)

par(xpd = NA, mfrow = c(3, 3), mai = rep(0, 4))
for (n in c(2, 3, 4, 5, 6, 8, 12, 20, 50)) {

  plot.new()
  plot.window(c(-1.25,1.25), c(-1.25,1.25))

  for (i in seq(1, .0005, length.out = 200)) {
    col <- adjustcolor("tomato", alpha.f = i)
    polygon(npolygon(x=(i-1)/4, y = (i-1)/4, r = i, d = i-1, n = n),
            col = NA, border=col)
  }

  mtext(sprintf("n = %i", n), side = 1, line = -3)
}

par(oldpar)

netplot documentation built on July 1, 2024, 1:06 a.m.