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https://github.com/ClemensFischer/XAML-Map-Control.git
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Updated MapProjection and MapGraticule
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ClemensFischer
parent
2a45c1165c
commit
cfed3575ac
16 changed files with 392 additions and 355 deletions
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@ -40,6 +40,12 @@ namespace MapControl
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public static readonly DependencyProperty StrokeThicknessProperty =
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DependencyPropertyHelper.Register<MapGraticule, double>(nameof(StrokeThickness), 0.5);
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private static readonly double[] lineDistances = [
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1d/3600d, 1d/1800d, 1d/720d, 1d/360d, 1d/240d, 1d/120d,
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1d/60d, 1d/30d, 1d/12d, 1d/6d, 1d/4d, 1d/2d,
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1d, 2d, 5d, 10d, 15d, 30d];
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/// <summary>
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/// Minimum graticule line distance in pixels. The default value is 150.
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/// </summary>
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@ -75,32 +81,31 @@ namespace MapControl
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private List<Label> DrawGraticule(PathFigureCollection figures)
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{
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figures.Clear();
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var labels = new List<Label>();
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var lineDistance = GetLineDistance();
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var labelFormat = lineDistance < 1d / 60d ? "{0} {1}°{2:00}'{3:00}\""
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: lineDistance < 1d ? "{0} {1}°{2:00}'" : "{0} {1}°";
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figures.Clear();
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if (ParentMap.MapProjection.IsNormalCylindrical)
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{
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DrawCylindricalGraticule(figures, labels, lineDistance, labelFormat);
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DrawNormalCylindrical(figures, labels);
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}
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else
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{
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DrawGraticule(figures, labels, lineDistance, labelFormat);
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DrawGraticule(figures, labels);
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}
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return labels;
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}
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private void DrawCylindricalGraticule(PathFigureCollection figures, List<Label> labels, double lineDistance, string labelFormat)
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private void DrawNormalCylindrical(PathFigureCollection figures, List<Label> labels)
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{
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var southWest = ParentMap.ViewToLocation(new Point(0d, ParentMap.ActualHeight));
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var northEast = ParentMap.ViewToLocation(new Point(ParentMap.ActualWidth, 0d));
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var lineDistance = GetLineDistance(MinLineDistance /
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(ParentMap.ViewTransform.Scale * MapProjection.Wgs84MeterPerDegree));
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var latLabelStart = Math.Ceiling(southWest.Latitude / lineDistance) * lineDistance;
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var lonLabelStart = Math.Ceiling(southWest.Longitude / lineDistance) * lineDistance;
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var labelFormat = GetLabelFormat(Math.Min(lineDistance, lineDistance));
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for (var lat = latLabelStart; lat <= northEast.Latitude; lat += lineDistance)
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{
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@ -122,43 +127,52 @@ namespace MapControl
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}
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}
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private void DrawGraticule(PathFigureCollection figures, List<Label> labels, double lineDistance, string labelFormat)
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private void DrawGraticule(PathFigureCollection figures, List<Label> labels)
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{
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var lineDistance = GetLineDistance(MinLineDistance /
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(ParentMap.ViewTransform.Scale * MapProjection.Wgs84MeterPerDegree * Math.Cos(ParentMap.Center.Latitude * Math.PI / 180d)));
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var labelFormat = GetLabelFormat(Math.Min(lineDistance, lineDistance));
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GetLatitudeRange(lineDistance, out double minLat, out double maxLat);
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var latSegments = (int)Math.Round(Math.Abs(maxLat - minLat) / lineDistance);
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var latSegments = (int)Math.Ceiling(Math.Abs(maxLat - minLat) / lineDistance);
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var interpolationCount = Math.Max(1, (int)Math.Ceiling(lineDistance));
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var interpolationDistance = lineDistance / interpolationCount;
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var latPoints = latSegments * interpolationCount;
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var interpolationStep = lineDistance / interpolationCount;
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var latStep = lineDistance;
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var startLat = minLat;
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if (Math.Abs(minLat) > Math.Abs(maxLat))
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{
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startLat = maxLat;
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latStep = -lineDistance;
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}
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var centerLon = Math.Round(ParentMap.Center.Longitude / lineDistance) * lineDistance;
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var minLon = centerLon - lineDistance;
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var minLon = centerLon;
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var maxLon = centerLon + lineDistance;
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if (DrawMeridian(figures, centerLon, minLat, interpolationDistance, latPoints))
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while (DrawMeridian(figures, minLon, minLat, interpolationStep, latSegments * interpolationCount) &&
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minLon > centerLon - 180d)
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{
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while (DrawMeridian(figures, minLon, minLat, interpolationDistance, latPoints) &&
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minLon > centerLon - 180d)
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{
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minLon -= lineDistance;
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}
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minLon -= lineDistance;
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}
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while (DrawMeridian(figures, maxLon, minLat, interpolationDistance, latPoints) &&
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maxLon < centerLon + 180d)
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{
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maxLon += lineDistance;
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}
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while (DrawMeridian(figures, maxLon, minLat, interpolationStep, latSegments * interpolationCount) &&
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maxLon < centerLon + 180d)
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{
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maxLon += lineDistance;
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}
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var lonSegments = (int)Math.Round(Math.Abs(maxLon - minLon) / lineDistance);
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for (var i = 1; i < latSegments; i++)
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{
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var lat = minLat + i * lineDistance;
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var lat = startLat + i * latStep;
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var lon = minLon;
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var points = new List<Point>();
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var mapPoint = ParentMap.MapProjection.LocationToMap(lat, lon);
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var position = ParentMap.ViewTransform.MapToView(mapPoint);
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var rotation = -ParentMap.MapProjection.GridConvergence(mapPoint.X, mapPoint.Y);
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var position = ParentMap.LocationToView(lat, lon);
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var rotation = -ParentMap.MapProjection.GridConvergence(lat, lon);
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points.Add(position);
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AddLabel(labels, labelFormat, lat, lon, position, rotation);
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@ -167,13 +181,12 @@ namespace MapControl
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{
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for (int k = 1; k <= interpolationCount; k++)
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{
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lon = minLon + j * lineDistance + k * interpolationDistance;
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mapPoint = ParentMap.MapProjection.LocationToMap(lat, lon);
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position = ParentMap.ViewTransform.MapToView(mapPoint);
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lon = minLon + j * lineDistance + k * interpolationStep;
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position = ParentMap.LocationToView(lat, lon);
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points.Add(position);
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}
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rotation = -ParentMap.MapProjection.GridConvergence(mapPoint.X, mapPoint.Y);
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rotation = -ParentMap.MapProjection.GridConvergence(lat, lon);
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AddLabel(labels, labelFormat, lat, lon, position, rotation);
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}
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@ -222,18 +235,16 @@ namespace MapControl
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if (minLat > -90d || maxLat < 90d)
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{
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var width = ParentMap.ActualWidth;
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var height = ParentMap.ActualHeight;
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var locations = new Location[]
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{
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ParentMap.ViewToLocation(new Point(0d, 0d)),
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ParentMap.ViewToLocation(new Point(width, 0d)),
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ParentMap.ViewToLocation(new Point(0d, height)),
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ParentMap.ViewToLocation(new Point(width, height)),
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ParentMap.ViewToLocation(new Point(width / 2d, 0d)),
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ParentMap.ViewToLocation(new Point(width / 2d, height)),
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ParentMap.ViewToLocation(new Point(0d, height / 2d)),
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ParentMap.ViewToLocation(new Point(width, height / 2d)),
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ParentMap.ViewToLocation(new Point(ParentMap.ActualWidth, 0d)),
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ParentMap.ViewToLocation(new Point(0d, ParentMap.ActualHeight)),
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ParentMap.ViewToLocation(new Point(ParentMap.ActualWidth, ParentMap.ActualHeight)),
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ParentMap.ViewToLocation(new Point(ParentMap.ActualWidth / 2d, 0d)),
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ParentMap.ViewToLocation(new Point(ParentMap.ActualWidth / 2d, ParentMap.ActualHeight)),
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ParentMap.ViewToLocation(new Point(0d, ParentMap.ActualHeight / 2d)),
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ParentMap.ViewToLocation(new Point(ParentMap.ActualWidth, ParentMap.ActualHeight / 2d)),
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};
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var latitudes = locations.Select(loc => loc.Latitude).Distinct();
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@ -241,32 +252,8 @@ namespace MapControl
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maxLat = Math.Max(maxLat, latitudes.Max());
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}
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minLatitude = Math.Max(Math.Floor(minLat / lineDistance - 1d) * lineDistance, -90d);
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maxLatitude = Math.Min(Math.Ceiling(maxLat / lineDistance + 1d) * lineDistance, 90d);
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}
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private double GetLineDistance()
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{
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var pixelPerDegree = ParentMap.ViewTransform.Scale * MapProjection.Wgs84MeterPerDegree;
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if (!ParentMap.MapProjection.IsNormalCylindrical)
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{
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pixelPerDegree *= Math.Cos(ParentMap.Center.Latitude * Math.PI / 180d);
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}
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var minDistance = MinLineDistance / Math.Max(1d, pixelPerDegree);
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var scale = minDistance < 1d / 60d ? 3600d : minDistance < 1d ? 60d : 1d;
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minDistance *= scale;
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var lineDistances = new double[] { 1d, 2d, 5d, 10d, 15d, 30d, 60d };
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var i = 0;
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while (i < lineDistances.Length - 1 && lineDistances[i] < minDistance)
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{
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i++;
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}
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return Math.Min(lineDistances[i] / scale, 30d);
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minLatitude = Math.Max(Math.Floor(minLat / lineDistance) * lineDistance, -90d);
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maxLatitude = Math.Min(Math.Ceiling(maxLat / lineDistance) * lineDistance, 90d);
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}
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private void AddLabel(List<Label> labels, string labelFormat, double latitude, double longitude, Point position, double rotation = 0d)
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@ -291,6 +278,20 @@ namespace MapControl
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}
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}
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private static double GetLineDistance(double minDistance)
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{
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minDistance = Math.Max(minDistance, lineDistances.First());
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minDistance = Math.Min(minDistance, lineDistances.Last());
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return lineDistances.First(d => d >= minDistance);
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}
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private static string GetLabelFormat(double lineDistance)
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{
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return lineDistance < 1d / 60d ? "{0} {1}°{2:00}'{3:00}\"" :
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lineDistance < 1d ? "{0} {1}°{2:00}'" : "{0} {1}°";
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}
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private static string GetLabelText(double value, string labelFormat, string hemispheres)
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{
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var hemisphere = hemispheres[0];
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@ -318,5 +319,18 @@ namespace MapControl
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figure.Segments.Add(new LineSegment { Point = p2 });
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return figure;
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}
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private static PathFigure CreatePolylineFigure(IEnumerable<Point> points)
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{
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var figure = new PathFigure
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{
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StartPoint = points.First(),
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IsClosed = false,
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IsFilled = false
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};
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figure.Segments.Add(CreatePolyLineSegment(points.Skip(1)));
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return figure;
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}
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}
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}
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