# @mathigon/euclid

Euclidean geometry classes and tools for JavaScript

## Usage no npm install needed!

``````<script type="module">
import mathigonEuclid from 'https://cdn.skypack.dev/@mathigon/euclid';
</script>``````

# Euclid.ts

Euclid.ts is a Typescript library for 2D geometry. It contains classes for elements like points, lines, circles, and polygons, intersection detection, as well as SVG and Canvas drawing tools. It was developed for Mathigon.org, an award-winning mathematics education project.

## API

All class instances are immutable: you need to create new copies rather than modifying their properties. This is mainly to facilitate fast change detection on downstream libraries.

• Points: `Point(x: number, y: number)`

• Lines: `Line(p1: Point, p2: Point)`, `Segment(p1: Point, p2: Point)`, `Ray(p1: Point, p2: Point)`

• Polygons: `Polygon(...points: Point[])`, `Polyline(...points: Point[])`

• Rectangles: `Rectangle(p: Point, w: number, h: number)`

• Circles: `Circle(c: Point, r: number)`

• Ellipses: `Ellipse(c: Point, a: number, b: number)`

• Arcs: `Arc((c: Point, start: Point, angle: number))`, `Sector((c: Point, start: Point, angle: number))`

• Angle: `Angle(a: Point, b: Point, c: Point)`

• Bounds: `Bounds(xMin: number, xMax: number, yMin: number, yMax: number)`

• Intersections: `intsersection(...obj: GeoShape[])`

• Drawing: `drawSVG(obj: GeoElement, options: SVGDrawingOptions)`, `drawCanvas(ctx: CanvasRenderingContext2D, obj: GeoElement, options: CanvasDrawingOptions)`

## Usage

First, install Euclid.ts from NPM using

`npm install @mathigon/euclid`

Now, simply import all functions and classes you need, using

``````import {Point, Line} from '@mathigon/euclid'
``````

## Contributing

We welcome community contributions: please file any bugs you find or send us pull requests with improvements. You can find out more on Mathigon.io.

Before submitting a pull request, you will need to sign the Mathigon Individual Contributor License Agreement.