Simple "hand made" meteor geolocation API

gistfile1.txt

retring = false

# make it global
@geolocation = new EventEmitter()

@geolocation.current = null

@geolocation.start   = ->

  if not navigator.geolocation

    geolocation.emit 'error', code: -1

    return

  # shows a top bar for the sake of moving while waiting
  NProgress.start() if not retring

  on_success = ( location ) ->
    NProgress.done() if not retring

    retring = false

    # compatibility
    location = 
      lat: location.coords.latitude
      lng: location.coords.longitude

    if geolocation.current

      c = latitude: geolocation.current.lat, longitude: geolocation.current.lng
      p = latitude: location.lat, longitude: location.lng

      distance = geolib.getDistance c, p

      # distance didn't change more than 500 meters, no need to update atm
      if distance < 500 then return

    geolocation.emit 'position', location
    geolocation.current = location

  on_error = ( error ) ->
    NProgress.done()

    geolocation.emit 'error', error

    retring = true

    retry = -> if retring then geolocation.start()
      
    # automatically retry in 1 seconds
    setTimeout retry, 5000

  navigator.geolocation.watchPosition( on_success, on_error, settings.gps.options )