HelpersMG (version 6.2)

newcompassRose: Display a compass rose

Description

Displays a basic compass rose, usually to orient a map.
newcompassRose displays a conventional compass rose at the position requested.
The size of the compass rose is determined by the character expansion, as the central "rose" is calculated relative to the character size.
Rotation is in degrees counterclockwise.

Usage

newcompassRose(
  x,
  y,
  rot = 0,
  cex = 1,
  col = "black",
  col.arrows.light = "white",
  col.arrows.dark = "black"
)

Value

none

Arguments

x

The position of the center of the compass rose in user units.

y

The position of the center of the compass rose in user units.

rot

Rotation for the compass rose in degrees. See Details.

cex

The character expansion to use in the display.

col

The color of text

col.arrows.light

The color of lighter lines

col.arrows.dark

The color of darker lines

Author

modified from Jim Lemon; See sp::compassRose()

Details

newcompassRose Display a compass rose

Examples

if (FALSE) {
library(HelpersMG)
require("maps")
map("world", "China")
newcompassRose(x=110, y=35, col.arrows.light="grey")
}