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Improved MapProjection.Center handling

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Clemens 2022-03-06 17:28:27 +01:00
parent f52281ba85
commit 123a9916eb
5 changed files with 32 additions and 11 deletions
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9
MapProjections/Shared/PolarStereographicProjection.cs
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@ -19,7 +19,6 @@ namespace MapControl.Projections
public static double ConvergenceTolerance { get; set; } = 1e-6;
public static int MaxIterations { get; set; } = 10;
public bool IsNorth { get; }
public double ScaleFactor { get; }
public double FalseEasting { get; }
public double FalseNorthing { get; }
@ -27,7 +26,7 @@ namespace MapControl.Projections
public PolarStereographicProjection(string crsId, bool isNorth, double scaleFactor, double falseEasting, double falseNorthing)
{
CrsId = crsId;
IsNorth = isNorth;
Center = new Location(isNorth ? 90d : -90d, 0d);
ScaleFactor = scaleFactor;
FalseEasting = falseEasting;
FalseNorthing = falseNorthing;
@ -35,7 +34,7 @@ namespace MapControl.Projections
public override Vector GetRelativeScale(Location location)
{
var lat = (IsNorth ? location.Latitude : -location.Latitude) * Math.PI / 180d;
var lat = Math.Sign(Center.Latitude) * location.Latitude * Math.PI / 180d;
var a = Wgs84EquatorialRadius;
var e = Wgs84Eccentricity;
var s = Math.Sqrt(Math.Pow(1 + e, 1 + e) * Math.Pow(1 - e, 1 - e));
@ -53,7 +52,7 @@ namespace MapControl.Projections
var lat = location.Latitude * Math.PI / 180d;
var lon = location.Longitude * Math.PI / 180d;
if (IsNorth)
if (Center.Latitude > 0d)
{
lon = Math.PI - lon;
}
@ -92,7 +91,7 @@ namespace MapControl.Projections
lat = newLat;
}
if (IsNorth)
if (Center.Latitude > 0d)
{
lon = Math.PI - lon;
}