ClemensFischer/XAML-Map-Control
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Use Matrix for projection relative scale

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ClemensFischer 2026-01-20 09:48:16 +01:00
parent 2c9e478095
commit ab155a26e7
21 changed files with 93 additions and 104 deletions
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14
MapControl/Shared/MapGraticule.cs
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@ -75,12 +75,14 @@ namespace MapControl
set => SetValue(FontSizeProperty, value);
}
private double PixelPerDegree => Math.Max(1d, ParentMap.ViewTransform.Scale * MapProjection.Wgs84MeterPerDegree);
private double lineDistance;
private string labelFormat;
private void SetLineDistance()
{
var minDistance = MinLineDistance / PixelPerLongitudeDegree(ParentMap.Center.Latitude, ParentMap.Center.Longitude);
var minDistance = MinLineDistance / PixelPerDegree;
var scale = minDistance < 1d / 60d ? 3600d : minDistance < 1d ? 60d : 1d;
minDistance *= scale;
@ -98,14 +100,6 @@ namespace MapControl
: lineDistance < 1d ? "{0} {1}°{2:00}'" : "{0} {1}°";
}
private double PixelPerLongitudeDegree(double latitude, double longitude)
{
var scale = ParentMap.GetMapScale(latitude, longitude);
return Math.Max(1d, // a reasonable lower limit
scale.X * Math.Cos(latitude * Math.PI / 180d) * MapProjection.Wgs84MeterPerDegree);
}
private string GetLabelText(double value, string hemispheres)
{
var hemisphere = hemispheres[0];
@ -131,7 +125,7 @@ namespace MapControl
{
// Get rotation from second location with same latitude.
//
var pos = ParentMap.LocationToView(latitude, longitude + 10d / PixelPerLongitudeDegree(latitude, longitude));
var pos = ParentMap.LocationToView(latitude, longitude + 10d / PixelPerDegree);
if (pos.HasValue)
{