mirror of
https://github.com/ClemensFischer/XAML-Map-Control.git
synced 2025-12-06 07:12:04 +01:00
121 lines
4.7 KiB
C#
121 lines
4.7 KiB
C#
// XAML Map Control - https://github.com/ClemensFischer/XAML-Map-Control
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// © 2022 Clemens Fischer
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// Licensed under the Microsoft Public License (Ms-PL)
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Net.Http;
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namespace MapControl.Projections
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{
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public class GeoApiProjectionFactory : MapProjectionFactory
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{
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public const int WorldMercator = 3395;
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public const int WebMercator = 3857;
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public const int Etrs89UtmNorthFirst = 25828;
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public const int Etrs89UtmNorthLast = 25838;
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public const int Wgs84UtmNorthFirst = 32601;
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public const int Wgs84UtmNorthLast = 32660;
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public const int Wgs84UpsNorth = 32661;
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public const int Wgs84UtmSouthFirst = 32701;
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public const int Wgs84UtmSouthLast = 32760;
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public const int Wgs84UpsSouth = 32761;
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private readonly Dictionary<int, string> wkts = new Dictionary<int, string>();
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private readonly HttpClient httpClient = new HttpClient();
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public override MapProjection CreateProjection(string crsId)
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{
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MapProjection projection = null;
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if (crsId.StartsWith("EPSG:") && int.TryParse(crsId.Substring(5), out int epsgCode))
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{
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switch (epsgCode)
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{
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case WorldMercator:
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projection = new WorldMercatorProjection();
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break;
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case WebMercator:
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projection = new WebMercatorProjection();
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break;
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case int c when c >= Etrs89UtmNorthFirst && c <= Etrs89UtmNorthLast:
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projection = new GeoApiProjection(GetEtrs89UtmWkt(epsgCode));
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break;
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case int c when c >= Wgs84UtmNorthFirst && c <= Wgs84UtmNorthLast:
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projection = new UtmProjection(epsgCode - Wgs84UtmNorthFirst + 1, true);
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break;
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case int c when c >= Wgs84UtmSouthFirst && c <= Wgs84UtmSouthLast:
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projection = new UtmProjection(epsgCode - Wgs84UtmSouthFirst + 1, false);
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break;
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case Wgs84UpsNorth:
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projection = new UpsNorthProjection();
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break;
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case Wgs84UpsSouth:
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projection = new UpsSouthProjection();
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break;
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default:
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projection = new GeoApiProjection(GetWkt(epsgCode));
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break;
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}
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}
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return projection ?? base.CreateProjection(crsId);
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}
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private static string GetEtrs89UtmWkt(int epsgCode)
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{
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const string etrs89UtmWktFormat
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= "PROJCS[\"ETRS89 / UTM zone {1}N\","
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+ "GEOGCS[\"ETRS89\","
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+ "DATUM[\"European_Terrestrial_Reference_System_1989\","
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+ "SPHEROID[\"GRS 1980\",6378137,298.257222101,AUTHORITY[\"EPSG\",\"7019\"]],"
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+ "TOWGS84[0,0,0,0,0,0,0],AUTHORITY[\"EPSG\",\"6258\"]],"
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+ "PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]],"
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+ "UNIT[\"degree\",0.0174532925199433,AUTHORITY[\"EPSG\",\"9122\"]],"
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+ "AUTHORITY[\"EPSG\",\"4258\"]],"
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+ "PROJECTION[\"Transverse_Mercator\"],"
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+ "PARAMETER[\"latitude_of_origin\",0],"
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+ "PARAMETER[\"central_meridian\",{2}],"
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+ "PARAMETER[\"scale_factor\",0.9996],"
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+ "PARAMETER[\"false_easting\",500000],"
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+ "PARAMETER[\"false_northing\",0],"
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+ "UNIT[\"metre\",1,AUTHORITY[\"EPSG\",\"9001\"]],"
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+ "AXIS[\"Easting\",EAST],"
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+ "AXIS[\"Northing\",NORTH],"
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+ "AUTHORITY[\"EPSG\",\"{0}\"]]";
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int centralMeridian = 6 * (epsgCode - Etrs89UtmNorthFirst) - 15;
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return string.Format(etrs89UtmWktFormat, epsgCode, epsgCode - 25800, centralMeridian);
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}
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private string GetWkt(int epsgCode)
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{
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if (!wkts.TryGetValue(epsgCode, out string wkt))
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{
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var url = string.Format("https://epsg.io/{0}.wkt", epsgCode);
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try
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{
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wkt = httpClient.GetStringAsync(url).Result; // potential deadlock?
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wkts[epsgCode] = wkt;
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}
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catch (Exception ex)
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{
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Debug.WriteLine($"GeoApiProjectionFactory.GetWkt({epsgCode}): {url}: {ex.Message}");
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}
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}
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return wkt;
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}
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}
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}
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