A two dimensional shape that surrounds two focal points, such that for all points on the curve, the sum of the two distances to the focal points is a constant.

The radius determines the size of the ellipsoid about X and Y axis. Ellipsoids can be created at a requested center. The segments specify the number of segments to create per full rotation.

Defaults:

• radius : [1, 1]
• center : [0, 0]
• startAngle : 0
• endAngle : PI * 2
• segments: 32

A two dimensional shape made by drawing a curve that is always the same distance from a center. All points are the same distance from the center.

Learn about circles at MathIsFun.com

The radius specifies the size across both X and Y axis. Circles can be created at a requested center. The segments specify the number of segments to create per full rotation.

Defaults:

• radius : 1
• center : [0, 0]
• segments: 32

let c1 = circle(1) 
let c2 = circle({r: 2, fn:5})            // fn = number of segments to approximate the circle
let c3 = circle({r: 3, center: true})