Check if point exists within a polygon in react-native-maps?

Question

I have an API that returns an array of latitudes and longitudes that define the boundaries of an area on a map(polygon).

In my react-native app, I have react-native-maps installed. How do I check if the user's location is in the polygon returned by the api?

I know this can be achieved with google maps web with the containsLocation() function. Does a function like that exist for react-native-maps?

Answer 1

For anyone still looking for an easier alternative (or for Circle support just like I needed it), look into using geolib: https://github.com/manuelbieh/Geolib.

Installation is simple and straightforward:

$yarn add geolib

Afterward in your React Native project, import it using:

import geolib from 'geolib'

And then just use the API as explained in the README.md.

Answer 2

react-native-maps doesn't expose that function, but there are two packages that I'm aware of that can help you:

1. react-native-geo-fencing that does the same as the google maps utility you've mentioned.

2. react-native-geo-fence handles location checks for you and exposes events you can hook into.