ClemensFischer/XAML-Map-Control
1
0
Fork 0
mirror of https://github.com/ClemensFischer/XAML-Map-Control.git synced 2026-04-09 00:14:51 +00:00
Code Issues Projects Releases Packages Wiki Activity

Avoid unnecessary Location and Point allocations

Browse source
This commit is contained in:
ClemensFischer 2025-12-12 21:28:45 +01:00
parent f44d2207e5
commit e268be2948
20 changed files with 205 additions and 172 deletions
Download patch file Download diff file Expand all files Collapse all files

16
MapControl/Shared/TransverseMercatorProjection.cs
View file

@ -25,15 +25,15 @@ namespace MapControl
Type = MapProjectionType.TransverseCylindrical;
}
public override Point GetRelativeScale(Location location)
public override Point GetRelativeScale(double latitude, double longitude)
{
return new Point(ScaleFactor, ScaleFactor);
}
public override Point? LocationToMap(Location location)
public override Point? LocationToMap(double latitude, double longitude)
{
#if NETFRAMEWORK || UWP
double Atanh(double x) => Math.Log((1d + x) / (1d - x)) / 2d;
static double Atanh(double x) => Math.Log((1d + x) / (1d - x)) / 2d;
#else
static double Atanh(double x) => Math.Atanh(x);
#endif
@ -48,10 +48,10 @@ namespace MapControl
var alpha3 = n3 * 61d / 240d;
// φ
var phi = location.Latitude * Math.PI / 180d;
var phi = latitude * Math.PI / 180d;
// (λ - λ0)
var lambda = (location.Longitude - CentralMeridian) * Math.PI / 180d;
var lambda = (longitude - CentralMeridian) * Math.PI / 180d;
var s = 2d * Math.Sqrt(n) / (1d + n);
var sinPhi = Math.Sin(phi);
@ -80,7 +80,7 @@ namespace MapControl
k0A * xi + FalseNorthing);
}
public override Location MapToLocation(Point point)
public override Location MapToLocation(double x, double y)
{
var n = Flattening / (2d - Flattening);
var n2 = n * n;
@ -98,10 +98,10 @@ namespace MapControl
var delta3 = n3 * 56d / 15d;
// ξ
var xi = (point.Y - FalseNorthing) / k0A;
var xi = (y - FalseNorthing) / k0A;
// η
var eta = (point.X - FalseEasting) / k0A;
var eta = (x - FalseEasting) / k0A;
// ξ'
var xi_ = xi