Begin statistics creation

CHDataManagement/Workouts/CLLocation+Extensions.swift

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+import CoreLocation
+
+extension CLLocation {
+
+    func duration(since other: CLLocation) -> TimeInterval {
+        duration(since: other.timestamp)
+    }
+
+    func duration(since other: Date) -> TimeInterval {
+        timestamp.timeIntervalSince(other)
+    }
+
+    func speed(from other: CLLocation) -> Double {
+        distance(from: other) / duration(since: other)
+    }
+
+    /// Combined uncertainty sphere radius (meters) from horizontal+vertical accuracy
+    var uncertaintyRadius3D: CLLocationDistance {
+        let h = max(0, horizontalAccuracy)
+        let v = max(0, verticalAccuracy)
+        return sqrt(h * h + v * v)
+    }
+
+    func verticalDistance(from other: CLLocation) -> CLLocationDistance {
+        abs(self.altitude - other.altitude)
+    }
+
+    func minimumDistance(to other: CLLocation) -> (distance: CLLocationDistance, point: CLLocation) {
+        let horizontalDistance = distance(from: other)
+        let horizontalMovement = Swift.max(0, horizontalDistance - Swift.max(0, other.horizontalAccuracy))
+
+        let latitude: CLLocationDegrees
+        let longitude: CLLocationDegrees
+        if horizontalDistance == 0 || horizontalMovement == 0 {
+            latitude = coordinate.latitude
+            longitude = coordinate.longitude
+        } else {
+            let horizontalRatio = horizontalMovement / horizontalDistance
+            latitude = coordinate.latitude.move(horizontalRatio, to: other.coordinate.latitude)
+            longitude = coordinate.longitude.move(horizontalRatio, to: other.coordinate.longitude)
+        }
+
+        let verticalDistance = verticalDistance(from: other)
+        let verticalMovement = Swift.max(0, verticalDistance - Swift.max(0, other.verticalAccuracy))
+
+        let altitude: CLLocationDistance
+        if verticalDistance == 0 || verticalMovement == 0 {
+            altitude = self.altitude
+        } else {
+            let verticalRatio = verticalMovement / verticalDistance
+            altitude = self.altitude.move(verticalRatio, to: other.altitude)
+        }
+
+        let movement = sqrt(horizontalMovement * horizontalMovement + verticalMovement * verticalMovement)
+        let point = CLLocation(
+            coordinate: .init(latitude: latitude, longitude: longitude),
+            altitude: altitude,
+            horizontalAccuracy: 0,
+            verticalAccuracy: 0,
+            timestamp: other.timestamp
+        )
+        return (movement, point)
+    }
+
+    func interpolate(_ time: Date, to other: CLLocation) -> CLLocation {
+        if self.timestamp > other.timestamp {
+            return other.interpolate(time, to: self)
+        }
+        let totalDuration = other.timestamp.timeIntervalSince(self.timestamp)
+        if totalDuration == 0 { return move(0.5, to: other) }
+        let ratio = time.timeIntervalSince(self.timestamp) / totalDuration
+        return move(ratio, to: other)
+    }
+
+    func move(_ ratio: Double, to other: CLLocation) -> CLLocation {
+        if ratio <= 0 { return self }
+        if ratio >= 1 { return other }
+
+        let time = timestamp.addingTimeInterval(other.timestamp.timeIntervalSince(timestamp) * ratio)
+
+        return CLLocation(
+            coordinate: .init(
+                latitude: coordinate.latitude.move(ratio, to: other.coordinate.latitude),
+                longitude: coordinate.longitude.move(ratio, to: other.coordinate.longitude)),
+            altitude: altitude.move(ratio, to: other.altitude),
+            horizontalAccuracy: move(from: horizontalAccuracy, to: other.horizontalAccuracy, by: ratio),
+            verticalAccuracy: move(from: verticalAccuracy, to: other.verticalAccuracy, by: ratio),
+            course: move(from: course, to: other.course, by: ratio),
+            courseAccuracy: move(from: courseAccuracy, to: other.courseAccuracy, by: ratio),
+            speed: move(from: speed, to: other.speed, by: ratio),
+            speedAccuracy: move(from: speedAccuracy, to: other.speedAccuracy, by: ratio),
+            timestamp: time)
+    }
+
+    private func move(from source: Double, to other: Double, by ratio: Double) -> Double {
+        if source == -1 {
+            return other
+        }
+        if other == -1 {
+            return source
+        }
+        return source.move(ratio, to: other)
+    }
+}