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Working on track statistics, work in progress
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| using System; | ||
| using System.Collections.Generic; | ||
| using PiLot.Model.Nav; | ||
|
|
||
| namespace PiLot.API.Helpers { | ||
|
|
||
| /// <summary> | ||
| /// This class helps analyzing a track, especially finding the fastest periods. | ||
| /// </summary> | ||
| public class TrackAnalyzer { | ||
|
|
||
| private Track track; | ||
| private List<EnhancedTrackPoint> trackPoints; | ||
|
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| public TrackAnalyzer(Track pTrack) { | ||
| this.track = pTrack; | ||
| this.PreprocessTrack(); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Returns the fastest segment either for a minimal distance or a minimal duration. | ||
| /// The resulting segment can be slightly longer than required, because of course | ||
| /// the TrackPoints can have any distance between them. If the track is shorter than | ||
| /// the required distance or time, the result is null. | ||
| /// </summary> | ||
| /// <param name="pType">The type of track segment to find</param> | ||
| /// <returns>The fastest segment for the type, or null</returns> | ||
| public TrackSegment GetFastestTrackSegment(TrackSegmentType pType) { | ||
| if (pType.IsDistance) { | ||
| return this.GetFastestSegmentByDistance(pType); | ||
| } else { | ||
| return this.GetFastestSegmentByDuration(pType); | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// This gets the fastest segment having a certain duration. E.g. the fastest hour. | ||
| /// </summary> | ||
| /// <param name="pType">The type defining the minimal duration</param> | ||
| /// <returns>The fastest segment or null</returns> | ||
| private TrackSegment GetFastestSegmentByDuration(TrackSegmentType pType) { | ||
| TrackSegment result = null; | ||
| Int32 startIndex = 0; | ||
| Int32 endIndex = 1; | ||
| Double duration; // seconds | ||
| Double distance; // meters | ||
| Double speed; // m/s | ||
| Double topSpeed = 0; // m/s | ||
| while (endIndex < this.trackPoints.Count) { | ||
| duration = (this.trackPoints[endIndex].UTC - this.trackPoints[startIndex].UTC) / 1000; | ||
| if (duration < pType.Duration) { | ||
| endIndex++; | ||
| } else { | ||
| distance = this.trackPoints[endIndex].TotalDistance - this.trackPoints[startIndex].TotalDistance; | ||
| speed = distance / duration; | ||
| if (speed > topSpeed) { | ||
| result = result ?? new TrackSegment(this.track, pType.ID); | ||
| result.StartUTC = this.trackPoints[startIndex].UTC; | ||
| result.StartBoatTime = this.trackPoints[startIndex].BoatTime ?? this.trackPoints[startIndex].UTC; | ||
| result.EndUTC = this.trackPoints[endIndex].UTC; | ||
| result.EndBoatTime = this.trackPoints[endIndex].BoatTime ?? this.trackPoints[endIndex].UTC; | ||
| result.Distance = distance; | ||
| topSpeed = speed; | ||
| } | ||
| startIndex++; | ||
| } | ||
| } | ||
| return result; | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// This gets the fastest segment having a certain distance. E.g. the fastest mile. | ||
| /// </summary> | ||
| /// <param name="pType">The type defining the minimal distance</param> | ||
| /// <returns>The fastest segment or null</returns> | ||
| private TrackSegment GetFastestSegmentByDistance(TrackSegmentType pType) { | ||
| TrackSegment result = null; | ||
| Int32 startIndex = 0; | ||
| Int32 endIndex = 1; | ||
| Double distance; // meters | ||
| Double speed; // m/s | ||
| Double topSpeed = 0; // m/s | ||
| while (endIndex < this.trackPoints.Count) { | ||
| distance = this.trackPoints[endIndex].TotalDistance - this.trackPoints[startIndex].TotalDistance; | ||
| if (distance < pType.Distance) { | ||
| endIndex++; | ||
| } else { | ||
| speed = distance / ((this.trackPoints[endIndex].UTC - this.trackPoints[startIndex].UTC) / 1000); | ||
| if(speed > topSpeed) { | ||
| result = result ?? new TrackSegment(this.track, pType.ID); | ||
| result.StartUTC = this.trackPoints[startIndex].UTC; | ||
| result.StartBoatTime = this.trackPoints[startIndex].BoatTime ?? this.trackPoints[startIndex].UTC; | ||
| result.EndUTC = this.trackPoints[endIndex].UTC; | ||
| result.EndBoatTime = this.trackPoints[endIndex].BoatTime ?? this.trackPoints[endIndex].UTC; | ||
| result.Distance = distance; | ||
| topSpeed = speed; | ||
| } | ||
| startIndex++; | ||
| } | ||
| } | ||
| return result; | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Creates a list of enhanced track points, which not only contain the | ||
| /// positions and timestamps, but also the total distance from the first | ||
| /// position. This makes calculating the total distance between any two | ||
| /// track points much faster. | ||
| /// </summary> | ||
| private void PreprocessTrack() { | ||
| this.trackPoints = new List<EnhancedTrackPoint>(); | ||
| if(track.TrackPoints.Count > 1) { | ||
| EnhancedTrackPoint currentTrackPoint = null, previousTrackPoint = null; | ||
| foreach (TrackPoint aTrackPoint in this.track.TrackPoints) { | ||
| if (currentTrackPoint != null) { | ||
| previousTrackPoint = currentTrackPoint; | ||
| } | ||
| currentTrackPoint = new EnhancedTrackPoint(aTrackPoint); | ||
| if (previousTrackPoint != null) { | ||
| currentTrackPoint.TotalDistance = previousTrackPoint.TotalDistance + currentTrackPoint.DistanceTo(previousTrackPoint); | ||
| } | ||
| this.trackPoints.Add(currentTrackPoint); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,23 @@ | ||
| using System; | ||
|
|
||
| namespace PiLot.Model.Nav { | ||
|
|
||
| /// <summary> | ||
| /// This is a special type of TrackPoint, which additionally has information about | ||
| /// the total distance, which helps for track analysis. | ||
| /// </summary> | ||
| public class EnhancedTrackPoint: TrackPoint { | ||
|
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| public EnhancedTrackPoint(TrackPoint pTrackPoint) : base(pTrackPoint.Latitude, pTrackPoint.Longitude) { | ||
| this.UTC = pTrackPoint.UTC; | ||
| this.BoatTime = pTrackPoint.BoatTime; | ||
| this.Altitude = pTrackPoint.Altitude; | ||
| this.LatitudeError = pTrackPoint.LatitudeError; | ||
| this.LongitudeError = pTrackPoint.LongitudeError; | ||
| this.AltitudeError = pTrackPoint.AltitudeError; | ||
| } | ||
|
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| public Double TotalDistance { get; set; } = 0; | ||
|
|
||
| } | ||
| } |
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