ClemensFischer/XAML-Map-Control
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Added WorldMercatorProjection, fixed bounding box problems when changing projection.

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ClemensF 2017-10-27 17:15:18 +02:00
parent 2f123886ff
commit 156ebfe177
21 changed files with 586 additions and 469 deletions
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6
MapControl/Shared/WebMercatorProjection.cs
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@ -12,7 +12,7 @@ using System.Windows;
namespace MapControl
{
/// <summary>
/// Transforms map coordinates according to the Web Mercator Projection.
/// Transforms map coordinates according to the Web (or Pseudo) Mercator Projection, EPSG:3857.
/// Longitude values are transformed linearly to X values in meters, by multiplying with MetersPerDegree.
/// Latitude values in the interval [-MaxLatitude .. MaxLatitude] are transformed to Y values in meters
/// in the interval [-R*pi .. R*pi], R=Wgs84EquatorialRadius.
@ -70,8 +70,6 @@ namespace MapControl
public static double LatitudeToY(double latitude)
{
var lat = latitude * Math.PI / 180d;
return latitude <= -90d ? double.NegativeInfinity
: latitude >= 90d ? double.PositiveInfinity
: Math.Log(Math.Tan((latitude + 90d) * Math.PI / 360d)) / Math.PI * 180d;
@ -79,7 +77,7 @@ namespace MapControl
public static double YToLatitude(double y)
{
return Math.Atan(Math.Exp(y * Math.PI / 180d)) / Math.PI * 360d - 90d;
return 90d - Math.Atan(Math.Exp(-y * Math.PI / 180d)) / Math.PI * 360d;
}
}
}