sidferreira

// App/RootNavigator.js

import { StackNavigator } from 'react-navigation'

import AScreen from '../Containers/AScreen'
import BScreen from '../Containers/BScreen'

const RootNavigator = StackNavigator(
  {
    A: { screen: AScreen },

mpontus

import React from "react";
import { StyleSheet, Text, View } from "react-native";
import SphericalMercator from "@mapbox/sphericalmercator";
import { MapView, Constants } from "expo";

const merc = new SphericalMercator();

const getZoomLevelFromRegion = (region, viewport) => {
  const { longitudeDelta } = region;
  const { width } = viewport;