ClemensFischer/XAML-Map-Control
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Unified map projections

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ClemensFischer 2026-02-01 17:25:04 +01:00
parent a4bd11e26d
commit 9fe7dccd68
21 changed files with 370 additions and 377 deletions
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19
MapControl/Shared/StereographicProjection.cs
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@ -25,7 +25,7 @@ namespace MapControl
"{0},1,{1:0.########},{2:0.########}", crsId, centerLongitude, centerLatitude);
}
public override double GridConvergence(double latitude, double longitude)
private void GetScaleAndGridConvergence(double latitude, double longitude, out double scale, out double gamma)
{
var phi0 = LatitudeOfOrigin * Math.PI / 180d; // φ1
var phi1 = latitude * Math.PI / 180d;
@ -44,13 +44,26 @@ namespace MapControl
var dCosPhi = k2 * cosPhi2 - k1 * cosPhi1;
var dSinPhi = k2 * sinPhi2 - k1 * sinPhi1;
return Math.Atan2(-sinLambda * dCosPhi,
scale = k1;
gamma = Math.Atan2(-sinLambda * dCosPhi,
cosPhi0 * dSinPhi - sinPhi0 * cosLambda * dCosPhi) * 180d / Math.PI;
}
public override double GridConvergence(double latitude, double longitude)
{
GetScaleAndGridConvergence(latitude, longitude, out double _, out double gamma);
return gamma;
}
public override Matrix RelativeTransform(double latitude, double longitude)
{
return new Matrix(1d, 0d, 0d, 1d, 0d, 0d);
GetScaleAndGridConvergence(latitude, longitude, out double scale, out double gamma);
var transform = new Matrix(scale, 0d, 0d, scale, 0d, 0d);
transform.Rotate(-gamma);
return transform;
}
public override Point LocationToMap(double latitude, double longitude)