# domgeom

> __Note:__ this is a work in progress.

A polyfill for the [DOM Geometry Interfaces Level 1](https://drafts.fxtf.org/geometry/) for JavaScript runtimes that don’t include them.

## Installation

domgeom is available as an [npm package](http://npmjs.com/package/domgeom):

```bash
npm install --save domgeom
```

### Usage

```
import { 
	DOMMatrix, 
	DOMMatrixReadOnly, 
	DOMPoint, 
	DOMPointReadOnly, 
	DOMRect,
	DOMRectReadOnly, 
	DOMQuad 
} from 'domgeom';

globalThis.DOMMatrix = DOMMatrix;
globalThis.DOMMatrixReadOnly = DOMMatrixReadOnly;
globalThis.DOMPoint = DOMPoint;
globalThis.DOMPointReadOnly = DOMPointReadOnly;
globalThis.DOMRect = DOMRect;
globalThis.DOMRectReadOnly = DOMRectReadOnly;
globalThis.DOMQuad = DOMQuad;
```

## Differences from the spec

* `DOMMatrixReadOnly.prototype.toString()` throws an `Error` instead of an `"InvalidStateError" DOMException`.
* The read-only interfaces are not actually read only (it just seemed tedious to implement). 

Also note that due to numerical errors there may be slight differences in the matrix values compared to browser environments. In tests, [rounding the values](https://github.com/danburzo/domgeom/blob/main/test/util.js) before comparisons is recommended.

## Further reading

* [CSS Transforms Level 2: Mathematical Description of Transform Functions](https://drafts.csswg.org/css-transforms-2/#mathematical-description)
* CSS tokenization code is taken from [Selery](https://github.com/danburzo/selery/).

DOM Geometry interfaces shim for Node.js. 

domgeom

danburzo

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domgeom

domgeom

Installation

Usage

Differences from the spec

Further reading

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