spatialEco (version 2.0-2)

rotate.polygon: Rotate polygon

Description

rotates polygon by specified angle

Usage

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

Value

an sp or sf polygon object with rotated polygon

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"

Details

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(sf)
 
data(meuse, package = "sp")
  meuse <- st_as_sf(meuse, coords = c("x", "y"), 
                    crs = 28992, agr = "constant")
 
 e <- st_convex_hull(st_union(meuse))
   e30 <- rotate.polygon(e, angle=30)
 
 plot(e, main="rotated 30 degrees")
   plot(e30, add=TRUE)