==== Ellipse ====

{{ :wiki:jscad-ellipse.svg?nolink | Ellipse }}

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

<code javascript>
const { ellipse } = require('@jscad/modeling').primitives

const myshape = ellipse({radius: [5, 10]})
const myshape = ellipse({radius: [5, 10], center: [5, 5], startAngle: Math.PI / 2, endAngle: Math.PI, segments: 64})
</code>

=== Circle ===

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.

{{ :wiki:jscad-circle.svg?nolink | Circle }}

//[[http://www.mathsisfun.com/algebra/circle-equations.html|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

<code javascript>
const { circle } = require('@jscad/modeling').primitives

const myshape = circle({radius: 10})
const myshape = circle({radius: 10, center: [5, 5], startAngle: Math.PI / 2, endAngle: Math.PI, segments: 64})
</code>