Rotate polygon

Source: R/rotate.polygon.R

rotates polygon by specified angle

rotate.polygon(
  p,
  angle = 45,
  sp = FALSE,
  anchor = c("center", "lower.left", "upper.right")
)

Arguments

p

A polygon object of sf or sp class
angle

Rotation angle in degrees
sp

(FALSE | TRUE) Output sp class object
anchor

Location to rotate polygon on options are "center", "lower.left" and "upper.right"

Value

an sp or sf polygon object with rotated polygon

Note

The anchor is the location that the rotation is anchored to. The center is the centroid where the lower.left and upper.right are based on the min or max of the coordinates respectively.

Examples

library(sp)
library(rgeos)

data(meuse)
  coordinates(meuse) <- ~x+y

e <- gConvexHull(meuse)
  e30 <- rotate.polygon(e, angle=30, sp=TRUE)

plot(e, main="rotated 30 degrees")

  plot(e30, add=TRUE)