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North arrow

north.Rd

Add a (North) arrow to a map

Usage

north(xy=NULL, type=1, label="N", angle=0, d, head=0.1, xpd=TRUE, ...)

Arguments

xy

numeric. x and y coordinate to place the arrow. It can also be one of following character values: "bottomleft", "bottom", "bottomright", topleft", "top", "topright", "left", "right", or NULL

type

integer between 1 and 12, or a character (unicode) representation of a right pointing arrow such as "\u27A9"

label

character, to be printed near the arrow

angle

numeric. The angle of the arrow in degrees

d

numeric. Distance covered by the arrow in plot coordinates. Only applies to type=1

head

numeric. The size of the arrow "head", for type=1

xpd

logical. If TRUE, the scale bar or arrow can be outside the plot area

...

graphical arguments to be passed to other methods

Value

none

See also

sbar, plot, inset

Examples

f <- system.file("ex/meuse.tif", package="terra")
r <- rast(f)
plot(r)
north()
north(c(178550, 332500), d=250)


if (FALSE) {
f <- system.file("ex/elev.tif", package="terra")
r <- rast(f)
plot(r, type="interval")
sbar(15, c(6.3, 50), type="bar", below="km", label=c(0,7.5,15), cex=.8)
north(type=3, cex=.8)
north(xy=c(6.7, 49.9), type=2, angle=45, label="NE")
north(xy=c(6.6, 49.7), type=5, cex=1.25)
north(xy=c(5.5, 49.6), type=9)
north(d=.05, xy=c(5.5, 50), angle=180, label="S", lwd=2, col="blue")


## all arrows
r <- rast(res=10)
values(r) <- 1
plot(r, col="white", axes=FALSE, legend=FALSE, mar=c(0,0,0,0), reset=TRUE)
for (i in 1:12) {
  x = -200+i*30
  north(xy=cbind(x,30), type=i)
  text(x, -20, i, xpd=TRUE)
}

}