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Update OrthographicProjection.cs

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ClemensFischer 2026-01-14 09:18:40 +01:00
parent 7e94c417db
commit d26df13a0d
1 changed files with 9 additions and 9 deletions
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18
MapControl/Shared/OrthographicProjection.cs
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@ -34,16 +34,16 @@ namespace MapControl
var phi = latitude * Math.PI / 180d;
var phi1 = Center.Latitude * Math.PI / 180d;
var lambda = (longitude - Center.Longitude) * Math.PI / 180d; // λ - λ0
var dLambda = (longitude - Center.Longitude) * Math.PI / 180d; // λ - λ0
if (Math.Abs(phi - phi1) > Math.PI / 2d || Math.Abs(lambda) > Math.PI / 2d)
if (Math.Abs(phi - phi1) > Math.PI / 2d || Math.Abs(dLambda) > Math.PI / 2d)
{
return null;
}
var x = Wgs84MeanRadius * Math.Cos(phi) * Math.Sin(lambda); // p.149 (20-3)
var x = Wgs84MeanRadius * Math.Cos(phi) * Math.Sin(dLambda); // p.149 (20-3)
var y = Wgs84MeanRadius * (Math.Cos(phi1) * Math.Sin(phi) -
Math.Sin(phi1) * Math.Cos(phi) * Math.Cos(lambda)); // p.149 (20-4)
Math.Sin(phi1) * Math.Cos(phi) * Math.Cos(dLambda)); // p.149 (20-4)
return new Point(x, y);
}
@ -63,18 +63,18 @@ namespace MapControl
return null;
}
var r = Math.Sqrt(r2);
var sinC = r;
var cosC = Math.Sqrt(1 - r2);
var r = Math.Sqrt(r2); // p.150 (20-18), r=ρ/R
var sinC = r; // p.150 (20-19)
var cosC = Math.Sqrt(1d - r2);
var phi1 = Center.Latitude * Math.PI / 180d;
var cosPhi1 = Math.Cos(phi1);
var sinPhi1 = Math.Sin(phi1);
var phi = Math.Asin(cosC * sinPhi1 + y * sinC * cosPhi1 / r); // p.150 (20-14)
var lambda = Math.Atan2(x * sinC, r * cosC * cosPhi1 - y * sinC * sinPhi1); // p.150 (20-15)
var dLambda = Math.Atan2(x * sinC, r * cosC * cosPhi1 - y * sinC * sinPhi1); // p.150 (20-15)
return new Location(180d / Math.PI * phi, 180d / Math.PI * lambda + Center.Longitude);
return new Location(180d / Math.PI * phi, 180d / Math.PI * dLambda + Center.Longitude);
}
}
}