CurrentLocation.js.coffee

################################################################################
# Seed data
################################################################################

CITIES = {      #    LAT,   LONG
  london:       [51.5072, 0.1275]
  manchester:   [53.4667, 2.2333]
  newcastle:    [54.9740, 1.6132]
  bristol:      [51.4500, 2.5833]
  southampton:  [50.8970, 1.4042]
}
DEFAULT_CENTER = new google.maps.LatLng CITIES.london...

################################################################################
# Holds current user location
################################################################################

angular.module('google')
  .factory 'CurrentLocation', ->

    # List of callbacks waiting on resolved position
    waiters = []
    resolved = false

    new class CurrentLocation
      
      # Uses html5 api to location current position.
      constructor: ->
        me = this
        @latlng = DEFAULT_CENTER
        navigator.geolocation.getCurrentPosition (pos) ->
          if pos?
            coords = [pos.coords.latitude, pos.coords.longitude]
            @latlng = new google.maps.LatLng coords...
            printMessage "Resolved current position #{@latlng}"
          else
            printMessage "Could not resolve current position [#{pos}]"
          printMessage "Notifying #{waiters.length} waiters"
          cb?(@latlng) for cb in waiters

      # Adds a new callback to the queue
      getLocation: (cb) ->
        if not resolved then waiters.push cb
        else cb?(@latlng)