Constrain to Box

Given an outer box (e.g. {width: 100, height: 100})

and an inner box (e.g. {width: 40, height: 40, x: 80, y: 30})

it returns a new constrained inner box (e.g. {width: 40, height: 40, x: 60, y: 30})

Using css props? Config your own props!

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``javascript
import constrain from 'constrain-to-box'
const constrainCSS = constrain.config({x: 'left', y: 'top'/, width: 'width', height: 'height'/})

const inner = {width: 50, height: 50, left: 655, top: 655}
const outer = {width: 500, height: 500, left: 200, top: 200}
const result = constrainCSS(outer, inner)
assert.deepEqual(result, {width: 50, height: 50, left: 650, top: 650})

// Returns the original if no changes were made, otherwise a new object
// (does not modify passed in values)
const wasModified = result !== inner
`

$3

I wrote this code for various projects many times, now it's easy!

$3

Mocha

`
npm install
npm test
``

https://github.com/Rob-ot/constrain-to-box