ClemensFischer/XAML-Map-Control
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Avoid unnecessary Location and Point allocations

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ClemensFischer 2025-12-12 21:28:45 +01:00
parent f44d2207e5
commit e268be2948
20 changed files with 205 additions and 172 deletions
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16
MapControl/Shared/StereographicProjection.cs
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@ -26,30 +26,30 @@ namespace MapControl
CrsId = crsId;
}
public override Point? LocationToMap(Location location)
public override Point? LocationToMap(double latitude, double longitude)
{
if (location.Equals(Center))
if (Location.Equals(latitude, Center.Latitude) &&
Location.Equals(longitude, Center.Longitude))
{
return new Point();
}
Center.GetAzimuthDistance(location, out double azimuth, out double distance);
Center.GetAzimuthDistance(latitude, longitude, out double azimuth, out double distance);
var mapDistance = Math.Tan(distance / 2d) * 2d * Wgs84EquatorialRadius;
return new Point(mapDistance * Math.Sin(azimuth), mapDistance * Math.Cos(azimuth));
}
public override Location MapToLocation(Point point)
public override Location MapToLocation(double x, double y)
{
if (point.X == 0d && point.Y == 0d)
if (x == 0d && y == 0d)
{
return new Location(Center.Latitude, Center.Longitude);
}
var azimuth = Math.Atan2(point.X, point.Y);
var mapDistance = Math.Sqrt(point.X * point.X + point.Y * point.Y);
var azimuth = Math.Atan2(x, y);
var mapDistance = Math.Sqrt(x * x + y * y);
var distance = 2d * Math.Atan(mapDistance / (2d * Wgs84EquatorialRadius));
return Center.GetLocation(azimuth, distance);