ClemensFischer/XAML-Map-Control
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General map graticule for WPF

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Clemens 2022-03-04 22:28:18 +01:00
parent c998f19fe5
commit a07948be02
11 changed files with 414 additions and 122 deletions
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23
MapControl/Shared/MapGraticule.cs
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@ -33,15 +33,9 @@ namespace MapControl
private double GetLineDistance()
{
var pixelPerDegree = ParentMap.ViewTransform.Scale * MapProjection.Wgs84MeterPerDegree;
var minDistance = MinLineDistance / pixelPerDegree;
var scale = 1d;
if (minDistance < 1d)
{
scale = minDistance < 1d / 60d ? 3600d : 60d;
minDistance *= scale;
}
var minDistance = MinLineDistance / PixelPerLongitudeDegree(ParentMap.Center);
var scale = minDistance < 1d / 60d ? 3600d : minDistance < 1d ? 60d : 1d;
minDistance *= scale;
var lineDistances = new double[] { 1d, 2d, 5d, 10d, 15d, 30d, 60d };
var i = 0;
@ -51,7 +45,14 @@ namespace MapControl
i++;
}
return lineDistances[i] / scale;
return Math.Min(lineDistances[i] / scale, 30d);
}
private double PixelPerLongitudeDegree(Location location)
{
return Math.Max(1d, // a reasonable lower limit
ParentMap.GetScale(location).X *
Math.Cos(location.Latitude * Math.PI / 180d) * MapProjection.Wgs84MeterPerDegree);
}
private static string GetLabelFormat(double lineDistance)
@ -64,6 +65,8 @@ namespace MapControl
{
var hemisphere = hemispheres[0];
value = (value + 540d) % 360d - 180d;
if (value < -1e-8) // ~1mm
{
value = -value;