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File scoped namespaces
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ClemensFischer
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152 changed files with 11962 additions and 12115 deletions
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using System;
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using System.Globalization;
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namespace MapControl
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{
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/// <summary>
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/// A geographic location with latitude and longitude values in degrees.
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/// </summary>
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namespace MapControl;
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/// <summary>
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/// A geographic location with latitude and longitude values in degrees.
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/// </summary>
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#if UWP || WINUI
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[Windows.Foundation.Metadata.CreateFromString(MethodName = "Parse")]
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[Windows.Foundation.Metadata.CreateFromString(MethodName = "Parse")]
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#else
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[System.ComponentModel.TypeConverter(typeof(LocationConverter))]
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[System.ComponentModel.TypeConverter(typeof(LocationConverter))]
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#endif
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public class Location(double latitude, double longitude) : IEquatable<Location>
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public class Location(double latitude, double longitude) : IEquatable<Location>
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{
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public double Latitude { get; } = Math.Min(Math.Max(latitude, -90d), 90d);
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public double Longitude => longitude;
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public bool LatitudeEquals(double latitude) => Math.Abs(Latitude - latitude) < 1e-9;
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public bool LongitudeEquals(double longitude) => Math.Abs(Longitude - longitude) < 1e-9;
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public bool Equals(double latitude, double longitude) => LatitudeEquals(latitude) && LongitudeEquals(longitude);
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public bool Equals(Location location) => location != null && Equals(location.Latitude, location.Longitude);
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public override bool Equals(object obj) => Equals(obj as Location);
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public override int GetHashCode() => Latitude.GetHashCode() ^ Longitude.GetHashCode();
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public override string ToString() => string.Format(CultureInfo.InvariantCulture, "{0},{1}", Latitude, Longitude);
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/// <summary>
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/// Creates a Location instance from a string containing a comma-separated pair of floating point numbers.
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/// </summary>
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public static Location Parse(string location)
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{
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public double Latitude { get; } = Math.Min(Math.Max(latitude, -90d), 90d);
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public double Longitude => longitude;
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string[] values = null;
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public bool LatitudeEquals(double latitude) => Math.Abs(Latitude - latitude) < 1e-9;
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public bool LongitudeEquals(double longitude) => Math.Abs(Longitude - longitude) < 1e-9;
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public bool Equals(double latitude, double longitude) => LatitudeEquals(latitude) && LongitudeEquals(longitude);
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public bool Equals(Location location) => location != null && Equals(location.Latitude, location.Longitude);
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public override bool Equals(object obj) => Equals(obj as Location);
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public override int GetHashCode() => Latitude.GetHashCode() ^ Longitude.GetHashCode();
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public override string ToString() => string.Format(CultureInfo.InvariantCulture, "{0},{1}", Latitude, Longitude);
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/// <summary>
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/// Creates a Location instance from a string containing a comma-separated pair of floating point numbers.
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/// </summary>
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public static Location Parse(string location)
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if (!string.IsNullOrEmpty(location))
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{
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string[] values = null;
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if (!string.IsNullOrEmpty(location))
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{
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values = location.Split(',');
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}
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if (values?.Length != 2)
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{
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throw new FormatException($"{nameof(Location)} string must contain a comma-separated pair of floating point numbers.");
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}
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return new Location(
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double.Parse(values[0], NumberStyles.Float, CultureInfo.InvariantCulture),
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double.Parse(values[1], NumberStyles.Float, CultureInfo.InvariantCulture));
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values = location.Split(',');
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}
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/// <summary>
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/// Normalizes a longitude to a value in the interval [-180 .. 180).
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/// </summary>
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public static double NormalizeLongitude(double longitude)
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if (values?.Length != 2)
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{
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var x = (longitude + 180d) % 360d;
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return x < 0d ? x + 180d : x - 180d;
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throw new FormatException($"{nameof(Location)} string must contain a comma-separated pair of floating point numbers.");
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}
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// Arithmetic mean radius (2*a + b) / 3 == (1 - f/3) * a.
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// See https://en.wikipedia.org/wiki/Earth_radius#Arithmetic_mean_radius.
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//
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public const double Wgs84MeanRadius = (1d - MapProjection.Wgs84Flattening / 3d) * MapProjection.Wgs84EquatorialRadius;
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return new Location(
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double.Parse(values[0], NumberStyles.Float, CultureInfo.InvariantCulture),
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double.Parse(values[1], NumberStyles.Float, CultureInfo.InvariantCulture));
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}
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/// <summary>
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/// Calculates great circle azimuth in degrees and distance in meters between this and the specified Location.
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/// See https://en.wikipedia.org/wiki/Great-circle_navigation#Course.
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/// </summary>
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public (double, double) GetAzimuthDistance(Location location, double earthRadius = Wgs84MeanRadius)
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{
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var lat1 = Latitude * Math.PI / 180d;
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var lon1 = Longitude * Math.PI / 180d;
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var lat2 = location.Latitude * Math.PI / 180d;
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var lon2 = location.Longitude * Math.PI / 180d;
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var cosLat1 = Math.Cos(lat1);
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var sinLat1 = Math.Sin(lat1);
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var cosLat2 = Math.Cos(lat2);
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var sinLat2 = Math.Sin(lat2);
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var cosLon12 = Math.Cos(lon2 - lon1);
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var sinLon12 = Math.Sin(lon2 - lon1);
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var a = cosLat2 * sinLon12;
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var b = cosLat1 * sinLat2 - sinLat1 * cosLat2 * cosLon12;
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// α1
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var azimuth = Math.Atan2(a, b);
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// σ12
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var distance = Math.Atan2(Math.Sqrt(a * a + b * b), sinLat1 * sinLat2 + cosLat1 * cosLat2 * cosLon12);
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/// <summary>
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/// Normalizes a longitude to a value in the interval [-180 .. 180).
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/// </summary>
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public static double NormalizeLongitude(double longitude)
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{
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var x = (longitude + 180d) % 360d;
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return (azimuth * 180d / Math.PI, distance * earthRadius);
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}
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return x < 0d ? x + 180d : x - 180d;
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}
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/// <summary>
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/// Calculates great distance in meters between this and the specified Location.
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/// See https://en.wikipedia.org/wiki/Great-circle_navigation#Course.
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/// </summary>
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public double GetDistance(Location location, double earthRadius = Wgs84MeanRadius)
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{
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(var _, var distance) = GetAzimuthDistance(location, earthRadius);
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// Arithmetic mean radius (2*a + b) / 3 == (1 - f/3) * a.
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// See https://en.wikipedia.org/wiki/Earth_radius#Arithmetic_mean_radius.
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//
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public const double Wgs84MeanRadius = (1d - MapProjection.Wgs84Flattening / 3d) * MapProjection.Wgs84EquatorialRadius;
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return distance;
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}
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/// <summary>
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/// Calculates great circle azimuth in degrees and distance in meters between this and the specified Location.
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/// See https://en.wikipedia.org/wiki/Great-circle_navigation#Course.
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/// </summary>
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public (double, double) GetAzimuthDistance(Location location, double earthRadius = Wgs84MeanRadius)
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{
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var lat1 = Latitude * Math.PI / 180d;
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var lon1 = Longitude * Math.PI / 180d;
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var lat2 = location.Latitude * Math.PI / 180d;
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var lon2 = location.Longitude * Math.PI / 180d;
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var cosLat1 = Math.Cos(lat1);
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var sinLat1 = Math.Sin(lat1);
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var cosLat2 = Math.Cos(lat2);
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var sinLat2 = Math.Sin(lat2);
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var cosLon12 = Math.Cos(lon2 - lon1);
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var sinLon12 = Math.Sin(lon2 - lon1);
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var a = cosLat2 * sinLon12;
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var b = cosLat1 * sinLat2 - sinLat1 * cosLat2 * cosLon12;
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// α1
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var azimuth = Math.Atan2(a, b);
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// σ12
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var distance = Math.Atan2(Math.Sqrt(a * a + b * b), sinLat1 * sinLat2 + cosLat1 * cosLat2 * cosLon12);
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/// <summary>
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/// Calculates the Location on a great circle at the specified azimuth in degrees and distance in meters from this Location.
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/// See https://en.wikipedia.org/wiki/Great-circle_navigation#Finding_way-points.
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/// </summary>
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public Location GetLocation(double azimuth, double distance, double earthRadius = Wgs84MeanRadius)
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{
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var lat1 = Latitude * Math.PI / 180d;
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var lon1 = Longitude * Math.PI / 180d;
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var a = azimuth * Math.PI / 180d;
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var d = distance / earthRadius;
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var cosLat1 = Math.Cos(lat1);
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var sinLat1 = Math.Sin(lat1);
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var cosA = Math.Cos(a);
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var sinA = Math.Sin(a);
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var cosD = Math.Cos(d);
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var sinD = Math.Sin(d);
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var lat2 = Math.Asin(sinLat1 * cosD + cosLat1 * sinD * cosA);
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var lon2 = lon1 + Math.Atan2(sinD * sinA, cosLat1 * cosD - sinLat1 * sinD * cosA);
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return (azimuth * 180d / Math.PI, distance * earthRadius);
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}
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return new Location(lat2 * 180d / Math.PI, lon2 * 180d / Math.PI);
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}
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/// <summary>
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/// Calculates great distance in meters between this and the specified Location.
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/// See https://en.wikipedia.org/wiki/Great-circle_navigation#Course.
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/// </summary>
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public double GetDistance(Location location, double earthRadius = Wgs84MeanRadius)
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{
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(var _, var distance) = GetAzimuthDistance(location, earthRadius);
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return distance;
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}
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/// <summary>
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/// Calculates the Location on a great circle at the specified azimuth in degrees and distance in meters from this Location.
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/// See https://en.wikipedia.org/wiki/Great-circle_navigation#Finding_way-points.
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/// </summary>
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public Location GetLocation(double azimuth, double distance, double earthRadius = Wgs84MeanRadius)
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{
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var lat1 = Latitude * Math.PI / 180d;
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var lon1 = Longitude * Math.PI / 180d;
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var a = azimuth * Math.PI / 180d;
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var d = distance / earthRadius;
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var cosLat1 = Math.Cos(lat1);
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var sinLat1 = Math.Sin(lat1);
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var cosA = Math.Cos(a);
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var sinA = Math.Sin(a);
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var cosD = Math.Cos(d);
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var sinD = Math.Sin(d);
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var lat2 = Math.Asin(sinLat1 * cosD + cosLat1 * sinD * cosA);
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var lon2 = lon1 + Math.Atan2(sinD * sinA, cosLat1 * cosD - sinLat1 * sinD * cosA);
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return new Location(lat2 * 180d / Math.PI, lon2 * 180d / Math.PI);
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}
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}
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