ios – Find out how to get the gap traveled at a sure location in a HKWorkout

Aim

I’m at the moment attempting to get the information to plot an elevation chart for a HKWorkout. I would like the X-axis to symbolize distance and the Y-axis to symbolize elevation. This kind of graph is pretty frequent and acts as a kind of cross part of a exercise route.

It is a tough mockup of the kind of chart I’m hoping to plot.

Progress

I’ve efficiently queried the WorkoutRoute for a given HKWorkout and I’m able to get the entire recorded CLLocations within the route.

    func getWorkoutRoute(for exercise: HKWorkout) async -> [CLLocation]? {
        let byWorkout = HKQuery.predicateForObjects(from: exercise)
        
        let samples = attempt? await withCheckedThrowingContinuation { (continuation: CheckedContinuation<[HKSample], Error>) in
            retailer.execute(HKAnchoredObjectQuery(kind: HKSeriesType.workoutRoute(), predicate: byWorkout, anchor: nil, restrict: HKObjectQueryNoLimit, resultsHandler: { (question, samples, deletedObjects, anchor, error) in
                if let hasError = error {
                    continuation.resume(throwing: hasError); return
                }
                
                guard let samples = samples else { return }
                
                continuation.resume(returning: samples)
            }))
        }
        
        guard let route = (samples as? [HKWorkoutRoute])?.first else { return nil }

        let areas = attempt? await withCheckedThrowingContinuation { (continuation: CheckedContinuation<[CLLocation], Error>) in
            var allLocations = [CLLocation]() // constructed up over time as and when HK tells us
            retailer.execute(HKWorkoutRouteQuery(route: route) { (question, locationsOrNil, carried out, errorOrNil) in
                // This block could also be referred to as a number of instances.
                if let error = errorOrNil {
                    continuation.resume(throwing: error); return
                }
                
                guard let areas = locationsOrNil else {
                    fatalError("Invalid State: This will solely fail if there was an error.")
                }
                allLocations += areas
                    
                if carried out {
                    continuation.resume(returning: allLocations)
                }
            })
        }
        return areas
    }

Drawback

Inside every CLLocation I’m able to entry the elevation (so that is the y-axis sorted) however I’m struggling to learn how to get the gap traveled for the given location.

CLLocation does has a technique to get the gap between two areas however that is calculated because the crow flies so is not going to give correct values. The areas additionally embrace a timestamp.
The HKWorkout objects ought to embrace all the information I have to acutely get the gap I am simply undecided how.

Different well being apps similar to HealthFit are in a position to present get the information I’m searching for so I do know it should be potential.

Can anybody level me in the proper route?