ellipse: Create an Ellipse

In sfdep: Spatial Dependence for Simple Features

Create an Ellipse

Description

Generate an ellipse from center coordinates, major and minor axis radii, and angle rotation.

Usage

ellipse(x = 0, y = 0, sx = 2, sy = 1, rotation = 0, n = 100)

st_ellipse(geometry, sx, sy, rotation = 0, n = 100)

Arguments

x	longitude of center point
y	latitude of center point
sx	radius of major axis
sy	radius of minor axis
rotation	the degree of rotation of the ellipse
n	the number of coordinates to generate for the ellipse
geometry	an sf ST_POINT geometry. Can be sfg, sfc, or sf object

Details

ellipse() returns a matrix of point locations defining the ellipse. st_ellipse() returns an sf object with LINE geography of the ellipse. Increasing n increases the number of points generated to define the ellipse shape.

ellipse() function is adapted from ggVennDiagram.

Value

an sf object

Examples

ellipse(n = 10)
st_ellipse(sf::st_point(c(0, 0)), sx = 10, sy = 10)

sfdep documentation built on Sept. 13, 2024, 5:07 p.m.