Circle

In ixfx, a circle is simply an object with radius, or if it’s positioned it also has coordinates:

type Circle = {
  radius:number
}
type CirclePositioned = {
  radius:number
  x:number
  y:number
}

Once you have that there are a bunch of functions to help you work with circles.

area - compute area
bbox - compute bounding box
center - compute center
circumference - (aka ‘length’)
distanceCenter - distance between two circle centers
distanceFromExterior - distance between outer edge of two circles
interpolate - compute relative position along circumference
intersectionLine - point(s) of intersection between a circle and line
intersections - points of intersections between two circles
isContainedBy - check if one circle contains another circle or point
isIntersecting - check if one circle intersects with another circle or point
nearest - compute nearest point on circle’s perimeter to a given point
pointOnPerimeter - get point on perimeter at specified angle
randomPoint - get a random point within circle

Importing

// Sub module
import { Circles } from "@ixfx/geometry.js"
// Eg: Circles.nearest();

// Whole module
import * as Geometry from "@ixfx/geometry.js"
// Eg: Geometry.Circles.nearest();

// From bundle
import { Geometry } from "@ixfx"
// Eg: Geometry.Circles.nearest();

// And within your HTML's <HEAD> </HEAD> block:
<script type="importmap">{ "imports": { "@ixfx":"/ixfx/index.js", "@ixfx/": "/ixfx/" } }</script>

// Sub module from parent
import { Circles } from "@ixfx/geometry.js"
// Eg: Circles.nearest();

// Whole parent module
import * as Geometry from "@ixfx/geometry.js"
// Eg: Geometry.Circles.nearest();

// From the bundle
import { Geometry } from "@ixfx/bundle.js"
// Eg: Geometry.Circles.nearest();

// Sub module from parent
import { Circles } from "https://unpkg.com/@ixfx/geometry/bundle"
// Eg: Circles.nearest();

// Whole parent module
import * as Geometry from "https://unpkg.com/@ixfx/geometry/bundle"
// Eg: Geometry.Circles.nearest();

// Single module from the bundle
import { Geometry } from "https://unpkg.com/@ixfx/bundle"
// Eg: Geometry.Circles.nearest();