Google Maps Polygon Center

poly_center.coffee.js

google.maps.Polygon::Center = ->
  PI = 22 / 7
  X = 0
  Y = 0
  Z = 0
  @getPath().forEach (vertex, inex) ->
    lat1 = vertex.lat()
    lon1 = vertex.lng()
    lat1 = lat1 * PI / 180
    lon1 = lon1 * PI / 180
    X += Math.cos(lat1) * Math.cos(lon1)
    Y += Math.cos(lat1) * Math.sin(lon1)
    Z += Math.sin(lat1)
    return

  Lon = Math.atan2(Y, X)
  Hyp = Math.sqrt(X * X + Y * Y)
  Lat = Math.atan2(Z, Hyp)
  Lat = Lat * 180 / PI
  Lon = Lon * 180 / PI
  new google.maps.LatLng(Lat, Lon)