check_ring_dir: Polygon rings directions are checked and corrected if asked.

In cartogramR: Continuous Cartogram

Polygon rings directions are checked and corrected if asked.

Description

Polygon ring are seen from above: exterior ring counter clockwise, holes clockwise

Usage

check_ring_dir(polygons, check.only = TRUE)

Arguments

polygons	a sfc object which contains simple feature geometry of types POLYGON or MULTIPOLYGON
check.only	a boolean which indicates if the function only checks the ring direction (check.only=TRUE) or checks and corrects the polygon direction (check.only=FALSE)

Value

Either a logical vector which indicates if line i of polygons is in the right direction (TRUE) or not or the corrected sfc object

Examples

  data(usa)
  all(check_ring_dir(sf::st_geometry(usa), check.only=TRUE))

cartogramR documentation built on Oct. 18, 2022, 5:08 p.m.