ClemensFischer/XAML-Map-Control
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MapProjection.Factory

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This commit is contained in:
ClemensFischer 2025-09-20 14:01:51 +02:00
parent c2a0fd836e
commit 616b2bf3f7
5 changed files with 36 additions and 89 deletions
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2
MapControl/Shared/GeoImage.cs
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@ -194,7 +194,7 @@ namespace MapControl
{
var epsgCode = geoKeyDirectory[i + 3];
return MapProjectionFactory.Instance.GetProjection($"EPSG:{epsgCode}");
return MapProjection.Parse($"EPSG:{epsgCode}");
}
}

10
MapControl/Shared/MapProjection.cs
View file

@ -31,6 +31,14 @@ namespace MapControl
public const double Wgs84Flattening = 1d / 298.257223563;
public static readonly double Wgs84Eccentricity = Math.Sqrt((2d - Wgs84Flattening) * Wgs84Flattening);
private static MapProjectionFactory factory;
public static MapProjectionFactory Factory
{
get => factory ??= new MapProjectionFactory();
set => factory = value;
}
/// <summary>
/// Gets the type of the projection.
/// </summary>
@ -147,7 +155,7 @@ namespace MapControl
/// </summary>
public static MapProjection Parse(string crsId)
{
return MapProjectionFactory.Instance.GetProjection(crsId);
return Factory.GetProjection(crsId);
}
}
}

38
MapControl/Shared/MapProjectionFactory.cs
View file

@ -4,14 +4,6 @@ namespace MapControl
{
public class MapProjectionFactory
{
private static MapProjectionFactory instance;
public static MapProjectionFactory Instance
{
get => instance ??= new MapProjectionFactory();
set => instance = value;
}
public virtual MapProjection GetProjection(string crsId)
{
MapProjection projection = null;
@ -75,28 +67,14 @@ namespace MapControl
return projection ?? throw new NotSupportedException($"MapProjection \"{crsId}\" is not supported.");
}
public virtual MapProjection GetProjection(int epsgCode)
public virtual MapProjection GetProjection(int epsgCode) => epsgCode switch
{
switch (epsgCode)
{
case var c when c >= Etrs89UtmProjection.FirstZoneEpsgCode && c <= Etrs89UtmProjection.LastZoneEpsgCode:
return new Etrs89UtmProjection(epsgCode % 100);
case var c when c >= Nad27UtmProjection.FirstZoneEpsgCode && c <= Nad27UtmProjection.LastZoneEpsgCode:
return new Nad27UtmProjection(epsgCode % 100);
case var c when c >= Nad83UtmProjection.FirstZoneEpsgCode && c <= Nad83UtmProjection.LastZoneEpsgCode:
return new Nad83UtmProjection(epsgCode % 100);
case var c when c >= Wgs84UtmProjection.FirstZoneNorthEpsgCode && c <= Wgs84UtmProjection.LastZoneNorthEpsgCode:
return new Wgs84UtmProjection(epsgCode % 100, true);
case var c when c >= Wgs84UtmProjection.FirstZoneSouthEpsgCode && c <= Wgs84UtmProjection.LastZoneSouthEpsgCode:
return new Wgs84UtmProjection(epsgCode % 100, false);
default:
return null;
}
}
var code when code >= Etrs89UtmProjection.FirstZoneEpsgCode && code <= Etrs89UtmProjection.LastZoneEpsgCode => new Etrs89UtmProjection(epsgCode % 100),
var code when code >= Nad27UtmProjection.FirstZoneEpsgCode && code <= Nad27UtmProjection.LastZoneEpsgCode => new Nad27UtmProjection(epsgCode % 100),
var code when code >= Nad83UtmProjection.FirstZoneEpsgCode && code <= Nad83UtmProjection.LastZoneEpsgCode => new Nad83UtmProjection(epsgCode % 100),
var code when code >= Wgs84UtmProjection.FirstZoneNorthEpsgCode && code <= Wgs84UtmProjection.LastZoneNorthEpsgCode => new Wgs84UtmProjection(epsgCode % 100, true),
var code when code >= Wgs84UtmProjection.FirstZoneSouthEpsgCode && code <= Wgs84UtmProjection.LastZoneSouthEpsgCode => new Wgs84UtmProjection(epsgCode % 100, false),
_ => null
};
}
}