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###
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  OrientationController (Orientation + buttons) for touch devices
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  @class bkcore.OrientationController
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  @author Thibaut 'BKcore' Despoulain <http://bkcore.com>
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###
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class OrientationController
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  @isCompatible: ->
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    return ('DeviceOrientationEvent' of window)
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  ###
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    Creates a new OrientationController
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    @param dom DOMElement The element that will listen to touch events
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    @param registerTouch bool Enable touch detection
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    @param touchCallback function Callback for touches
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  ###
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  constructor: (@dom, @registerTouch=true, @touchCallback=null) ->
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    @active = true
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    @alpha = 0.0
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    @beta = 0.0
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    @gamma  = 0.0
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    @dalpha = null
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    @dbeta = null
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    @dgamma = null
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    @touches = null
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    window.addEventListener('deviceorientation', ((e)=> @orientationChange(e)), false)
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    if @registerTouch
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      @dom.addEventListener('touchstart', ((e)=> @touchStart(e)), false)
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      @dom.addEventListener('touchend', ((e)=> @touchEnd(e)), false)
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  ###
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    @private
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  ###
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  orientationChange: (event) ->
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    return if not @active
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    if(@dalpha == null)
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      console.log "calbrate", event.beta 
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      @dalpha = event.alpha
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      @dbeta = event.beta
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      @dgamma = event.gamma
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    @alpha = event.alpha - @dalpha
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    @beta = event.beta - @dbeta
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    @gamma = event.gamma - @dgamma
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    false
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  ###
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    @private
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  ###
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  touchStart: (event) ->
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    return if not @active
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    for touch in event.changedTouches
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        @touchCallback?(on, touch, event)
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    @touches = event.touches
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    false
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  ###
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    @private
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  ###
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  touchEnd: (event) ->
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    return if not @active
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    for touch in event.changedTouches
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        @touchCallback?(on, touch, event)
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    @touches = event.touches
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    false
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exports = exports ? @
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exports.bkcore ||= {}
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exports.bkcore.controllers ||= {}
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exports.bkcore.controllers.OrientationController = OrientationController
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