Sure.

Adjusting the first answer on https://stackoverflow.com/questions/33232008/javascript-calcualate-the-geo-coordinate-points-of-four-corners-around-a-cente for our need in javascript:

const toRad = d => d * Math.PI / 180;

const getCoordinates = (pLatitude, pLongitude, pDistanceInMeters) => {
var latRadian = toRad(pLatitude);

var degLatKm = 110.574235;
var degLongKm = 110.572833 * Math.cos(latRadian);
var deltaLat = pDistanceInMeters / 1000.0 / degLatKm;
var deltaLong = pDistanceInMeters / 1000.0 / degLongKm;

var topLat = pLatitude + deltaLat;
var bottomLat = pLatitude - deltaLat;
var leftLng = pLongitude - deltaLong;
var rightLng = pLongitude + deltaLong;

var northEastCoords = topLat + ',' + rightLng;
var southWestCoords = bottomLat + ',' + leftLng;

return {
    bottomLeft: southWestCoords,
    topRight: northEastCoords
}

};

In your case, the user position could be (pLatitude, pLongitude) and pDistanceInMeters is basically half of the square width you need.

For example:

getCoordinates(32, 35, 10000);

Output:
{
“bottomLeft”: “31.909563018907615,34.89335731287973”,
“topRight”: “32.09043698109239,35.10664268712027”
}

You can see how the 3 points look visually here: https://mobisoftinfotech.com/tools/plot-multiple-points-on-map/ with the following input for example:
32,35,blue,circle, "Center"
31.909563018907615,34.89335731287973,red,circle,"Bottom-left"
32.09043698109239,35.10664268712027,red,circle,“Top-right”

Feel free to let me know if you have any questions.

Thanks,
OpenWeb Ninja

Hi,
Yes we can exchange in english
Ok I will try to find how find but if you have an example it would be very kinf of you 😃

Hi Pierre-Jean

I am sorry but I don’t understand french - can we chat in english? If not, I will try to use Google Translate which I hope will be accurate enough most of the times…

If I understand you correctly and you are interested in radius R around the user located at some geo point (latitude0, longitude0), you can for example calculate the bottom-left and top-right corners of the square that is packed within a circle with radius X and send those to the API - to calculate the 2 corner points, you can use a utility function that calculates a geo point in a certain distance and an angle from a given geo point and use it to calculate bottom-left point at distance R and angle 5PI/4 and top-right distance R and angle PI/4. This is at least how you can do it with the API as is. I can also add support for point and radius queries which will do something similar to what I described above under the hood.

Thank you,
OpenWeb Ninja

Oui c’est exactement cela
Disons que si mon utilisateur démarre en voiture je souhaiterais pouvoir lui indiquer les alertes Waze autour de lui dans un rayon de x mètres puis au fur et a mesure qu’il roule interroger periodiquement pour avoir les nouvelles alertes mais sans interroger trop souvent pour ne pas consommer trop de credits
J’ai le point de depart : lattidude - longitude
Ensuite au depart quand le vehicule démarre je n’ai que cela. Ensuite je peux conserver le precedent point de geolocalisation et tenter de determiner la direction dans laquelle roule le vehicule (je ne sais pas comment faire mais je pense que je peux trouver comment faire peut etre)
A moins que vous ne puissiez modifier votre API et pouvoir (comme dans d 'autres API) indiquer un rayon autour du point et eventuellement une orientation (nord, surd, est ouest) ??
Merci pour votre aide
PIerre-Jean

Hi,

Thank you for your message.

1. I assume you are referring to the Alerts and Jams endpoint. If so: do you have the bottom left coordinate and want to determine the top right one? In general, the two corrdinates, bottom left and top right, determine the geographic area (rectangle) for which alerts will be returned.
2. You should be able to call the endpoint periodically. Deciding on an interval probably involves looking at the specific use case, the freshness needed and / or how “busy” and “dynamic” the area is / how often it changes.
   3 + 4) Please let me check what can be done and I’ll get back to you.

Thank you,
OpenWeb Ninja