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