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ClemensFischer 2026-04-13 17:14:49 +02:00
parent c14377f976
commit 65aba44af6
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101
MapControl/Shared/WebMercatorProjection.cs
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@ -6,66 +6,65 @@ using System.Windows.Media;
using Avalonia;
#endif
namespace MapControl
namespace MapControl;
/// <summary>
/// Spherical Mercator Projection - EPSG:3857.
/// See "Map Projections - A Working Manual" (https://pubs.usgs.gov/publication/pp1395), p.41-44.
/// </summary>
public class WebMercatorProjection : MapProjection
{
/// <summary>
/// Spherical Mercator Projection - EPSG:3857.
/// See "Map Projections - A Working Manual" (https://pubs.usgs.gov/publication/pp1395), p.41-44.
/// </summary>
public class WebMercatorProjection : MapProjection
public const string DefaultCrsId = "EPSG:3857";
public WebMercatorProjection() // parameterless constructor for XAML
: this(DefaultCrsId)
{
public const string DefaultCrsId = "EPSG:3857";
}
public WebMercatorProjection() // parameterless constructor for XAML
: this(DefaultCrsId)
public WebMercatorProjection(string crsId)
{
IsNormalCylindrical = true;
CrsId = crsId;
}
public override Matrix RelativeTransform(double latitude, double longitude)
{
var k = 1d / Math.Cos(latitude * Math.PI / 180d); // p.44 (7-3)
return new Matrix(k, 0d, 0d, k, 0d, 0d);
}
public override Point LocationToMap(double latitude, double longitude)
{
return new Point(
EquatorialRadius * Math.PI / 180d * longitude,
EquatorialRadius * Math.PI / 180d * LatitudeToY(latitude));
}
public override Location MapToLocation(double x, double y)
{
return new Location(YToLatitude(
y / EquatorialRadius * 180d / Math.PI),
x / EquatorialRadius * 180d / Math.PI);
}
public static double LatitudeToY(double latitude)
{
if (latitude <= -90d)
{
return double.NegativeInfinity;
}
public WebMercatorProjection(string crsId)
if (latitude >= 90d)
{
IsNormalCylindrical = true;
CrsId = crsId;
return double.PositiveInfinity;
}
public override Matrix RelativeTransform(double latitude, double longitude)
{
var k = 1d / Math.Cos(latitude * Math.PI / 180d); // p.44 (7-3)
return Math.Log(Math.Tan((latitude + 90d) * Math.PI / 360d)) * 180d / Math.PI;
}
return new Matrix(k, 0d, 0d, k, 0d, 0d);
}
public override Point LocationToMap(double latitude, double longitude)
{
return new Point(
EquatorialRadius * Math.PI / 180d * longitude,
EquatorialRadius * Math.PI / 180d * LatitudeToY(latitude));
}
public override Location MapToLocation(double x, double y)
{
return new Location(YToLatitude(
y / EquatorialRadius * 180d / Math.PI),
x / EquatorialRadius * 180d / Math.PI);
}
public static double LatitudeToY(double latitude)
{
if (latitude <= -90d)
{
return double.NegativeInfinity;
}
if (latitude >= 90d)
{
return double.PositiveInfinity;
}
return Math.Log(Math.Tan((latitude + 90d) * Math.PI / 360d)) * 180d / Math.PI;
}
public static double YToLatitude(double y)
{
return 90d - Math.Atan(Math.Exp(-y * Math.PI / 180d)) * 360d / Math.PI;
}
public static double YToLatitude(double y)
{
return 90d - Math.Atan(Math.Exp(-y * Math.PI / 180d)) * 360d / Math.PI;
}
}