ClemensFischer/XAML-Map-Control
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Removed azimuthal and "auto" map projections

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Removing these projections - which were never really well implemented - greatly simplifies the code. There is no ProjectionCenter anymore and MapProjection methods do not return null Locations or Points.
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ClemensFischer 2026-01-29 16:27:34 +01:00
parent f4481c31f0
commit 76b879dfac
37 changed files with 181 additions and 1076 deletions
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15
MapControl/Shared/PolarStereographicProjection.cs
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@ -21,7 +21,7 @@ namespace MapControl
public double FalseNorthing { get; set; } = 2e6;
public Hemisphere Hemisphere { get; set; }
public static double RelativeScale(Hemisphere hemisphere, double flattening, double scaleFactor, double latitude)
public static Matrix RelativeScale(Hemisphere hemisphere, double flattening, double scaleFactor, double latitude, double longitude)
{
var sign = hemisphere == Hemisphere.North ? 1d : -1d;
var phi = sign * latitude * Math.PI / 180d;
@ -33,20 +33,21 @@ namespace MapControl
/ Math.Pow((1d - eSinPhi) / (1d + eSinPhi), e / 2d); // p.161 (15-9)
// r == ρ/a
var r = scaleFactor * 2d * t / Math.Sqrt(Math.Pow(1d + e, 1d + e) * Math.Pow(1d - e, 1d - e)); // p.161 (21-33)
var r = 2d * scaleFactor * t / Math.Sqrt(Math.Pow(1d + e, 1d + e) * Math.Pow(1d - e, 1d - e)); // p.161 (21-33)
var m = Math.Cos(phi) / Math.Sqrt(1d - eSinPhi * eSinPhi); // p.160 (14-15)
var k = r / m; // p.161 (21-32)
return r / m; // p.161 (21-32)
var transform = new Matrix(k, 0d, 0d, k, 0d, 0d);
transform.Rotate(-sign * longitude);
return transform;
}
public override Matrix RelativeTransform(double latitude, double longitude)
{
var k = RelativeScale(Hemisphere, Flattening, ScaleFactor, latitude);
return RelativeTransform(latitude, longitude, k, k);
return RelativeScale(Hemisphere, Flattening, ScaleFactor, latitude, longitude);
}
public override Point? LocationToMap(double latitude, double longitude)
public override Point LocationToMap(double latitude, double longitude)
{
var sign = Hemisphere == Hemisphere.North ? 1d : -1d;
var phi = sign * latitude * Math.PI / 180d;