How to tell if Coordinate is in between two other coordinates

Question

I have an array of CLLocations which represent the route user calculated.

User has an option to add certain POIs to that route and I need to know the way to tell where exactly on the route that POI will be.

What I came up with is next:

I would go through my route array, and grab a pair of CLLocations and calculate a distance from my POI to both of those coordinates and save that value. I can do so for all pairs of coordinates on the route, and then see which distance is the smallest and that is how I would know if my coordinate is between two other ones.

Is there any other method of doing it but this one ?

"Between" in what sense? there's no strict ordering defined on two-dimensional vectors. — The Paramagnetic Croissant, Sep 12 '15 at 16:43
you can try if is in the radius of certain coordinate or not — Teja Nandamuri, Sep 12 '15 at 19:07

score 1 · Accepted Answer · answered Sep 12 '15 at 16:39

This is how you can achieve this:

- (CLLocation*)closestLocationToLocation:(CLLocation*)currLocation {
    CLLocationDistance minDistance;

    CLLocation *closestLocation = nil;

    for (CLLocation *location in arrayOfLocations) {
        CLLocationDistance distance = [location distanceFromLocation:currLocation];

        if (distance <= minDistance || closestLocation == nil) {
            minDistance = distance;
            closestLocation = location;
        }
    }

    return closestLocation;
}

How to tell if Coordinate is in between two other coordinates

1 Answers1