ClemensFischer/XAML-Map-Control
1
0
Fork 0
mirror of https://github.com/ClemensFischer/XAML-Map-Control.git synced 2026-04-08 07:55:13 +00:00
Code Issues Projects Releases Packages Wiki Activity

Changed class Location to readonly struct

Browse source
This commit is contained in:
ClemensFischer 2026-02-01 22:56:50 +01:00
parent d7d7bba5f2
commit 6566167ff0
27 changed files with 194 additions and 307 deletions
Download patch file Download diff file Expand all files Collapse all files

37
MapControl/Shared/Location.cs
View file

@ -5,35 +5,20 @@ namespace MapControl
{
/// <summary>
/// A geographic location with latitude and longitude values in degrees.
/// For calculations with azimuth and distance on great circles, see
/// https://en.wikipedia.org/wiki/Great_circle,
/// https://en.wikipedia.org/wiki/Great-circle_distance,
/// https://en.wikipedia.org/wiki/Great-circle_navigation.
/// </summary>
#if UWP || WINUI
[Windows.Foundation.Metadata.CreateFromString(MethodName = "Parse")]
#else
[System.ComponentModel.TypeConverter(typeof(LocationConverter))]
#endif
public class Location : IEquatable<Location>
public readonly struct Location(double latitude, double longitude) : IEquatable<Location>
{
// Arithmetic mean radius (2*a + b) / 3 == (1 - f/3) * a.
// See https://en.wikipedia.org/wiki/Earth_radius#Arithmetic_mean_radius.
//
public const double Wgs84MeanRadius = (1d - MapProjection.Wgs84Flattening / 3d) * MapProjection.Wgs84EquatorialRadius;
public double Latitude { get; } = Math.Min(Math.Max(latitude, -90d), 90d);
public double Longitude => longitude;
public Location()
{
}
public static bool operator ==(Location loc1, Location loc2) => loc1.Equals(loc2);
public Location(double latitude, double longitude)
{
Latitude = Math.Min(Math.Max(latitude, -90d), 90d);
Longitude = longitude;
}
public double Latitude { get; }
public double Longitude { get; }
public static bool operator !=(Location loc1, Location loc2) => !loc1.Equals(loc2);
public bool LatitudeEquals(double latitude) => Math.Abs(Latitude - latitude) < 1e-9;
@ -41,9 +26,9 @@ namespace MapControl
public bool Equals(double latitude, double longitude) => LatitudeEquals(latitude) && LongitudeEquals(longitude);
public bool Equals(Location location) => location != null && Equals(location.Latitude, location.Longitude);
public bool Equals(Location location) => Equals(location.Latitude, location.Longitude);
public override bool Equals(object obj) => Equals(obj as Location);
public override bool Equals(object obj) => obj is Location location && Equals(location);
public override int GetHashCode() => Latitude.GetHashCode() ^ Longitude.GetHashCode();
@ -81,8 +66,14 @@ namespace MapControl
return x < 0d ? x + 180d : x - 180d;
}
// Arithmetic mean radius (2*a + b) / 3 == (1 - f/3) * a.
// See https://en.wikipedia.org/wiki/Earth_radius#Arithmetic_mean_radius.
//
public const double Wgs84MeanRadius = (1d - MapProjection.Wgs84Flattening / 3d) * MapProjection.Wgs84EquatorialRadius;
/// <summary>
/// Calculates great circle azimuth in degrees and distance in meters between this and the specified Location.
/// See https://en.wikipedia.org/wiki/Great-circle_navigation#Course.
/// </summary>
public (double, double) GetAzimuthDistance(Location location, double earthRadius = Wgs84MeanRadius)
{
@ -108,6 +99,7 @@ namespace MapControl
/// <summary>
/// Calculates great distance in meters between this and the specified Location.
/// See https://en.wikipedia.org/wiki/Great-circle_navigation#Course.
/// </summary>
public double GetDistance(Location location, double earthRadius = Wgs84MeanRadius)
{
@ -118,6 +110,7 @@ namespace MapControl
/// <summary>
/// Calculates the Location on a great circle at the specified azimuth in degrees and distance in meters from this Location.
/// See https://en.wikipedia.org/wiki/Great-circle_navigation#Finding_way-points.
/// </summary>
public Location GetLocation(double azimuth, double distance, double earthRadius = Wgs84MeanRadius)
{