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Updated MapGraticule

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ClemensFischer 2026-01-13 09:06:48 +01:00
parent 5ff974997a
commit 5d490ed254
1 changed files with 23 additions and 53 deletions
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76
MapControl/Shared/MapGraticule.cs
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@ -210,10 +210,7 @@ namespace MapControl
private void DrawGraticule(PathFigureCollection figures, List<Label> labels)
{
var minLat = 0d;
var maxLat = 0d;
GetLatitudeRange(lineDistance, ref minLat, ref maxLat);
GetLatitudeRange(lineDistance, out double minLat, out double maxLat);
var latSegments = (int)Math.Round(Math.Abs(maxLat - minLat) / lineDistance);
var interpolationCount = Math.Max(1, (int)Math.Ceiling(lineDistance / LineInterpolationResolution));
@ -319,61 +316,34 @@ namespace MapControl
return visible;
}
private void GetLatitudeRange(double lineDistance, ref double minLatitude, ref double maxLatitude)
private void GetLatitudeRange(double lineDistance, out double minLatitude, out double maxLatitude)
{
var width = ParentMap.ActualWidth;
var height = ParentMap.ActualHeight;
var northPole = ParentMap.LocationToView(90d, 0d);
var southPole = ParentMap.LocationToView(-90d, 0d);
if (northPole.HasValue &&
northPole.Value.X >= 0d && northPole.Value.X <= width &&
northPole.Value.Y >= 0d && northPole.Value.Y <= height)
var locations = new Location[]
{
maxLatitude = 90d;
ParentMap.ViewToLocation(new Point(0d, 0d)),
ParentMap.ViewToLocation(new Point(width / 2d, 0d)),
ParentMap.ViewToLocation(new Point(width, 0d)),
ParentMap.ViewToLocation(new Point(width, height / 2d)),
ParentMap.ViewToLocation(new Point(width, height)),
ParentMap.ViewToLocation(new Point(width / 2d, height)),
ParentMap.ViewToLocation(new Point(0d, height)),
ParentMap.ViewToLocation(new Point(0d, height / 2)),
};
var latitudes = locations.Where(loc => loc != null).Select(loc => loc.Latitude).Distinct();
var south = -90d;
var north = 90d;
if (latitudes.Any())
{
south = latitudes.Min();
north = latitudes.Max();
}
if (southPole.HasValue &&
southPole.Value.X >= 0d && southPole.Value.X <= width &&
southPole.Value.Y >= 0d && southPole.Value.Y <= height)
{
minLatitude = -90d;
}
if (minLatitude > -90d || maxLatitude < 90d)
{
var locations = new Location[]
{
ParentMap.ViewToLocation(new Point(0d, 0d)),
ParentMap.ViewToLocation(new Point(width / 2d, 0d)),
ParentMap.ViewToLocation(new Point(width, 0d)),
ParentMap.ViewToLocation(new Point(width, height / 2d)),
ParentMap.ViewToLocation(new Point(width, height)),
ParentMap.ViewToLocation(new Point(width / 2d, height)),
ParentMap.ViewToLocation(new Point(0d, height)),
ParentMap.ViewToLocation(new Point(0d, height / 2)),
};
var latitudes = locations.Where(loc => loc != null).Select(loc => loc.Latitude);
var south = -90d;
var north = 90d;
if (latitudes.Distinct().Count() >= 2)
{
south = latitudes.Min();
north = latitudes.Max();
}
if (minLatitude > -90d)
{
minLatitude = Math.Max(Math.Floor(south / lineDistance) * lineDistance, -90d);
}
if (maxLatitude < 90d)
{
maxLatitude = Math.Min(Math.Ceiling(north / lineDistance) * lineDistance, 90d);
}
}
minLatitude = Math.Max(Math.Floor(south / lineDistance) * lineDistance, -90d);
maxLatitude = Math.Min(Math.Ceiling(north / lineDistance) * lineDistance, 90d);
}
private static PathFigure CreateLineFigure(Point p1, Point p2)