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Updated MapProjection and MapGraticule

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ClemensFischer 2026-02-01 01:42:24 +01:00
parent 2a45c1165c
commit cfed3575ac
16 changed files with 392 additions and 355 deletions
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54
MapControl/Shared/MapProjectionFactory.cs
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@ -1,25 +1,54 @@
using System;
using System.Globalization;
namespace MapControl
{
public class MapProjectionFactory
{
public virtual MapProjection GetProjection(string crsId)
public MapProjection GetProjection(string crsId)
{
var projection = crsId switch
var projection = CreateProjection(crsId);
if (projection == null &&
crsId.StartsWith("EPSG:") &&
int.TryParse(crsId.Substring(5), out int epsgCode))
{
WebMercatorProjection.DefaultCrsId => new WebMercatorProjection(),
WorldMercatorProjection.DefaultCrsId => new WorldMercatorProjection(),
EquirectangularProjection.DefaultCrsId or "CRS:84" => new EquirectangularProjection(crsId),
Wgs84UpsNorthProjection.DefaultCrsId => new Wgs84UpsNorthProjection(),
Wgs84UpsSouthProjection.DefaultCrsId => new Wgs84UpsSouthProjection(),
_ => GetProjectionFromEpsgCode(crsId),
};
projection = CreateProjection(epsgCode);
}
return projection ?? throw new NotSupportedException($"MapProjection \"{crsId}\" is not supported.");
}
public virtual MapProjection GetProjection(int epsgCode)
protected virtual MapProjection CreateProjection(string crsId)
{
MapProjection projection = crsId switch
{
WebMercatorProjection.DefaultCrsId => new WebMercatorProjection(),
WorldMercatorProjection.DefaultCrsId => new WorldMercatorProjection(),
Wgs84UpsNorthProjection.DefaultCrsId => new Wgs84UpsNorthProjection(),
Wgs84UpsSouthProjection.DefaultCrsId => new Wgs84UpsSouthProjection(),
EquirectangularProjection.DefaultCrsId or "CRS:84" => new EquirectangularProjection(crsId),
_ => null,
};
if (projection == null && crsId.StartsWith(StereographicProjection.DefaultCrsId))
{
var parameters = crsId.Split(',');
if (parameters.Length == 4 &&
parameters[0] == StereographicProjection.DefaultCrsId &&
parameters[1] == "1" &&
double.TryParse(parameters[2], NumberStyles.Float, CultureInfo.InvariantCulture, out double longitude) &&
double.TryParse(parameters[3], NumberStyles.Float, CultureInfo.InvariantCulture, out double latitude))
{
projection = new StereographicProjection(longitude, latitude);
}
}
return projection;
}
protected virtual MapProjection CreateProjection(int epsgCode)
{
return epsgCode switch
{
@ -36,10 +65,5 @@ namespace MapControl
_ => null
};
}
protected MapProjection GetProjectionFromEpsgCode(string crsId)
{
return crsId.StartsWith("EPSG:") && int.TryParse(crsId.Substring(5), out int epsgCode) ? GetProjection(epsgCode) : null;
}
}
}