Breakpoint custom events

BreakpointEvents

#Coffeescript Breakpoint Event Broadcaster
#requires coffeescript, underscore.js, jQuery, throttledresize event (https://github.com/louisremi/jquery-smartresize)
#to initialize: breakpoint = new BreakpointEvent([480,600])
#pass array of breakpoints you want to watch

class BreakpointEvent
	#we're going to fire a custom event when the page goes past certain breakpoints
	#this should prevent multiple objects doing lots of logic on throttledresize; they
	#can just listen for a particular breakpoint event
	#passed arguments will fire as "breakpoint" + argument e.g. new BreakpointEvent([480]) would announce a "breakpoint480" event
	constructor: (points) ->
		#set up some variables
		@breakpoints = points if _.isArray(points)
		@last_size = 0

		#do it
		this.fireEvents()

		#call the bind event method to get things going from here
		this.bindEvents()
	bindEvents: ->
		that = this
		$(window).on 'throttledresize', ->
			that.fireEvents()
	fireEvents: ->
		window_width = $(window).width()
		delta = [@last_size..window_width]
		#see if there's any intersection between the two arrays
		test = _.intersection(delta, @breakpoints)

		#console.log "fireEvent fired.  Window width: " + window_width + "Intersection: " + test
		#trigger our breakpoint
		$(window).trigger('breakpoint'+test) if test?
		@last_size = window_width