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region

region

A helper to work with rectangular regions in the DOM

Install

$ npm install region --save

Usage

var Region = require('region')
 
var region = Region({
    top: 10,
    left: 10,
    width: 50,
    height: 60
})
 
region.getRight() == 60
region.getBottom() == 70

API

Instantiation

You can create a new Region by calling the function returned by require('region'). You can call it as a constructor if you want.

var Region = require('region')
 
new Region({
    top: 10,
    left: 10
    //either width,height 
    //or right, bottom 
    width: 10,
    height: 10
})

or

var Region = require('region')
var r = Region({
    top: 10,
    left: 10,
    right: 20,
    bottom: 20
})

You can instantiate a Region from a DOM node, using Region.fromDOM (NOTE: uses dom.offsetWidth/Height/Left/Top for getting coordinates)

var r = Region.fromDOM(document.body)

Getters

  • get - returns an object with {top, left, bottom, right}
  • getWidth
  • getHeight
  • getLeft
  • getTop
  • getRight
  • getBottom
  • getPosition - returns an object with {left, top}
  • getSize - returns an object with {width, height}

containsPoint(x,y) or containsPoint({x,y}) : Boolean

var r = Region({
    top: 10,
    left: 10,
    width: 10,
    height: 10
})
 
r.containsPoint(15, 10) == true
r.containsPoint({x: 10, y: 10}) == true

equals(r): Boolean

Returns true if this region equals the region (or the object) given as the first param var r = Region({top: 10, left: 10, bottom: 20, right: 20 })

r.equals({top: 10, left: 10, bottom: 20, right: 20 }) == true

equalsPosition({top, left}): Boolean

Returns true if this region has top, left equal to the given coordinates

equalsSize({width, height}): Boolean

Returns true if this region has the same size as the given region or object

var coords = { top: 10, left: 10, width: 100, height: 100 }
var r = Region(coords)
r.equalsSize(coords) == true
r.equalsSize(r.clone()) == true

getIntersection(Region): Region/false

Returns the region resulted by intersecting this region with the given region. If no intersection, returns false

clone: Region

Returns a new region instance with the same coordinates

var r = new Region({left: 10, right: 10, width: 10, height: 20})
r.clone().equals(r)

Tests

$ make

Watch mode

$ make test-w

License

MIT