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ClemensFischer
parent
c14377f976
commit
65aba44af6
152 changed files with 11962 additions and 12115 deletions
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@ -17,254 +17,253 @@ using Avalonia.Layout;
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using PathFigureCollection = Avalonia.Media.PathFigures;
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#endif
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namespace MapControl
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namespace MapControl;
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/// <summary>
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/// Draws a map graticule, i.e. a lat/lon grid overlay.
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/// </summary>
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public partial class MapGraticule : MapGrid
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{
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/// <summary>
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/// Draws a map graticule, i.e. a lat/lon grid overlay.
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/// </summary>
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public partial class MapGraticule : MapGrid
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protected override void DrawGrid(PathFigureCollection figures, List<Label> labels)
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{
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protected override void DrawGrid(PathFigureCollection figures, List<Label> labels)
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if (ParentMap.MapProjection.IsNormalCylindrical)
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{
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if (ParentMap.MapProjection.IsNormalCylindrical)
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DrawNormalGraticule(figures, labels);
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}
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else
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{
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DrawGraticule(figures, labels);
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}
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}
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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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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 double GetLineDistance(bool scaleByLatitude)
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{
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var minDistance = MinLineDistance / (ParentMap.ViewTransform.Scale * MapProjection.Wgs84MeterPerDegree);
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if (scaleByLatitude)
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{
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minDistance /= Math.Cos(ParentMap.Center.Latitude * Math.PI / 180d);
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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 void DrawNormalGraticule(PathFigureCollection figures, List<Label> labels)
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{
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var lineDistance = GetLineDistance(false);
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var labelFormat = GetLabelFormat(lineDistance);
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var mapRect = ParentMap.ViewTransform.ViewToMapBounds(new Rect(0d, 0d, ParentMap.ActualWidth, ParentMap.ActualHeight));
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var southWest = ParentMap.MapProjection.MapToLocation(mapRect.X, mapRect.Y);
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var northEast = ParentMap.MapProjection.MapToLocation(mapRect.X + mapRect.Width, mapRect.Y + mapRect.Height);
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var minLat = Math.Ceiling(southWest.Latitude / lineDistance) * lineDistance;
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var minLon = Math.Ceiling(southWest.Longitude / lineDistance) * lineDistance;
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for (var lat = minLat; lat <= northEast.Latitude; lat += lineDistance)
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{
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var p1 = ParentMap.LocationToView(lat, southWest.Longitude);
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var p2 = ParentMap.LocationToView(lat, northEast.Longitude);
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figures.Add(CreateLineFigure(p1, p2));
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if (ParentMap.ViewTransform.Rotation == 0d)
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{
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DrawNormalGraticule(figures, labels);
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var text = GetLatitudeLabelText(lat, labelFormat);
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labels.Add(new Label(text, p1.X, p1.Y, 0d, HorizontalAlignment.Left, VerticalAlignment.Bottom));
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labels.Add(new Label(text, p2.X, p2.Y, 0d, HorizontalAlignment.Right, VerticalAlignment.Bottom));
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}
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}
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for (var lon = minLon; lon <= northEast.Longitude; lon += lineDistance)
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{
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var p1 = ParentMap.LocationToView(southWest.Latitude, lon);
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var p2 = ParentMap.LocationToView(northEast.Latitude, lon);
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figures.Add(CreateLineFigure(p1, p2));
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if (ParentMap.ViewTransform.Rotation == 0d)
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{
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var text = GetLongitudeLabelText(lon, labelFormat);
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labels.Add(new Label(text, p1.X, p1.Y, 0d, HorizontalAlignment.Left, VerticalAlignment.Bottom));
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labels.Add(new Label(text, p2.X, p2.Y, 0d, HorizontalAlignment.Left, VerticalAlignment.Top));
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}
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else
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{
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DrawGraticule(figures, labels);
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for (var lat = minLat; lat <= northEast.Latitude; lat += lineDistance)
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{
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AddLabel(labels, labelFormat, lat, lon, ParentMap.LocationToView(lat, lon), 0d);
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}
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}
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}
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}
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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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private void DrawGraticule(PathFigureCollection figures, List<Label> labels)
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{
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var lineDistance = GetLineDistance(true);
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var labelFormat = GetLabelFormat(lineDistance);
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var pointDistance = Math.Min(lineDistance, 1d);
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var interpolationCount = (int)(lineDistance / pointDistance);
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var center = Math.Round(ParentMap.Center.Longitude / lineDistance) * lineDistance;
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var minLat = Math.Round(ParentMap.Center.Latitude / pointDistance) * pointDistance;
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var maxLat = minLat;
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var minLon = center;
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var maxLon = center;
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private static string GetLabelFormat(double lineDistance)
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for (var lon = center;
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lon >= center - 180d && DrawMeridian(figures, lon, pointDistance, ref minLat, ref maxLat);
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lon -= 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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minLon = lon;
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}
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private double GetLineDistance(bool scaleByLatitude)
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for (var lon = center + lineDistance;
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lon < center + 180d && DrawMeridian(figures, lon, pointDistance, ref minLat, ref maxLat);
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lon += lineDistance)
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{
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var minDistance = MinLineDistance / (ParentMap.ViewTransform.Scale * MapProjection.Wgs84MeterPerDegree);
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if (scaleByLatitude)
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{
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minDistance /= Math.Cos(ParentMap.Center.Latitude * Math.PI / 180d);
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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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maxLon = lon;
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}
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private void DrawNormalGraticule(PathFigureCollection figures, List<Label> labels)
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if (minLon + 360d > maxLon)
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{
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var lineDistance = GetLineDistance(false);
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var labelFormat = GetLabelFormat(lineDistance);
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var mapRect = ParentMap.ViewTransform.ViewToMapBounds(new Rect(0d, 0d, ParentMap.ActualWidth, ParentMap.ActualHeight));
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var southWest = ParentMap.MapProjection.MapToLocation(mapRect.X, mapRect.Y);
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var northEast = ParentMap.MapProjection.MapToLocation(mapRect.X + mapRect.Width, mapRect.Y + mapRect.Height);
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var minLat = Math.Ceiling(southWest.Latitude / lineDistance) * lineDistance;
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var minLon = Math.Ceiling(southWest.Longitude / lineDistance) * lineDistance;
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for (var lat = minLat; lat <= northEast.Latitude; lat += lineDistance)
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{
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var p1 = ParentMap.LocationToView(lat, southWest.Longitude);
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var p2 = ParentMap.LocationToView(lat, northEast.Longitude);
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figures.Add(CreateLineFigure(p1, p2));
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if (ParentMap.ViewTransform.Rotation == 0d)
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{
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var text = GetLatitudeLabelText(lat, labelFormat);
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labels.Add(new Label(text, p1.X, p1.Y, 0d, HorizontalAlignment.Left, VerticalAlignment.Bottom));
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labels.Add(new Label(text, p2.X, p2.Y, 0d, HorizontalAlignment.Right, VerticalAlignment.Bottom));
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}
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}
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for (var lon = minLon; lon <= northEast.Longitude; lon += lineDistance)
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{
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var p1 = ParentMap.LocationToView(southWest.Latitude, lon);
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var p2 = ParentMap.LocationToView(northEast.Latitude, lon);
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figures.Add(CreateLineFigure(p1, p2));
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if (ParentMap.ViewTransform.Rotation == 0d)
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{
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var text = GetLongitudeLabelText(lon, labelFormat);
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labels.Add(new Label(text, p1.X, p1.Y, 0d, HorizontalAlignment.Left, VerticalAlignment.Bottom));
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labels.Add(new Label(text, p2.X, p2.Y, 0d, HorizontalAlignment.Left, VerticalAlignment.Top));
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}
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else
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{
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for (var lat = minLat; lat <= northEast.Latitude; lat += lineDistance)
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{
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AddLabel(labels, labelFormat, lat, lon, ParentMap.LocationToView(lat, lon), 0d);
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}
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}
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}
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minLon -= lineDistance;
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}
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private void DrawGraticule(PathFigureCollection figures, List<Label> labels)
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if (maxLon - 360d < minLon)
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{
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var lineDistance = GetLineDistance(true);
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var labelFormat = GetLabelFormat(lineDistance);
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var pointDistance = Math.Min(lineDistance, 1d);
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var interpolationCount = (int)(lineDistance / pointDistance);
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var center = Math.Round(ParentMap.Center.Longitude / lineDistance) * lineDistance;
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var minLat = Math.Round(ParentMap.Center.Latitude / pointDistance) * pointDistance;
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var maxLat = minLat;
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var minLon = center;
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var maxLon = center;
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for (var lon = center;
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lon >= center - 180d && DrawMeridian(figures, lon, pointDistance, ref minLat, ref maxLat);
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lon -= lineDistance)
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{
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minLon = lon;
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}
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for (var lon = center + lineDistance;
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lon < center + 180d && DrawMeridian(figures, lon, pointDistance, ref minLat, ref maxLat);
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lon += lineDistance)
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{
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maxLon = lon;
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}
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if (minLon + 360d > maxLon)
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{
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minLon -= lineDistance;
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}
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if (maxLon - 360d < minLon)
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{
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maxLon += lineDistance;
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}
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if (pointDistance < lineDistance)
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{
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minLat = Math.Ceiling(minLat / lineDistance - 1e-6) * lineDistance;
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maxLat = Math.Floor(maxLat / lineDistance + 1e-6) * lineDistance;
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}
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maxLat += 1e-6;
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maxLon += 1e-6;
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for (var lat = minLat; lat <= maxLat; lat += lineDistance)
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{
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var points = new List<Point>();
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for (var lon = minLon; lon <= maxLon; lon += lineDistance)
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{
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var p = ParentMap.LocationToView(lat, lon);
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points.Add(p);
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AddLabel(labels, labelFormat, lat, lon, p, -ParentMap.MapProjection.GridConvergence(lat, lon));
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for (int j = 1; j < interpolationCount; j++)
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{
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points.Add(ParentMap.LocationToView(lat, lon + j * pointDistance));
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}
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}
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if (points.Count >= 2)
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{
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figures.Add(CreatePolylineFigure(points));
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}
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}
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maxLon += lineDistance;
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}
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private bool DrawMeridian(PathFigureCollection figures, double lon,
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double latStep, ref double minLat, ref double maxLat)
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if (pointDistance < lineDistance)
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{
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minLat = Math.Ceiling(minLat / lineDistance - 1e-6) * lineDistance;
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maxLat = Math.Floor(maxLat / lineDistance + 1e-6) * lineDistance;
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}
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maxLat += 1e-6;
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maxLon += 1e-6;
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for (var lat = minLat; lat <= maxLat; lat += lineDistance)
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{
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var points = new List<Point>();
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var visible = false;
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for (var lat = minLat + latStep; lat < maxLat; lat += latStep)
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for (var lon = minLon; lon <= maxLon; lon += lineDistance)
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{
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var p = ParentMap.LocationToView(lat, lon);
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points.Add(p);
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visible = visible || ParentMap.InsideViewBounds(p);
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AddLabel(labels, labelFormat, lat, lon, p, -ParentMap.MapProjection.GridConvergence(lat, lon));
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for (int j = 1; j < interpolationCount; j++)
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{
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points.Add(ParentMap.LocationToView(lat, lon + j * pointDistance));
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}
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}
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for (var lat = minLat; lat >= -90d; lat -= latStep)
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{
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var p = ParentMap.LocationToView(lat, lon);
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points.Insert(0, p);
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if (!ParentMap.InsideViewBounds(p)) break;
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minLat = lat;
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visible = true;
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}
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for (var lat = maxLat; lat <= 90d; lat += latStep)
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{
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var p = ParentMap.LocationToView(lat, lon);
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points.Add(p);
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if (!ParentMap.InsideViewBounds(p)) break;
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maxLat = lat;
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visible = true;
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}
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if (visible && points.Count >= 2)
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if (points.Count >= 2)
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{
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figures.Add(CreatePolylineFigure(points));
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}
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return visible;
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}
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private void AddLabel(List<Label> labels, string labelFormat, double lat, double lon, Point position, double rotation)
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{
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if (lat > -90d && lat < 90d && ParentMap.InsideViewBounds(position))
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{
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rotation = ((rotation + ParentMap.ViewTransform.Rotation) % 360d + 540d) % 360d - 180d;
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if (rotation < -90d)
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{
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rotation += 180d;
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}
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else if (rotation > 90d)
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{
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rotation -= 180d;
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}
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var text = GetLatitudeLabelText(lat, labelFormat) +
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"\n" + GetLongitudeLabelText(lon, labelFormat);
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labels.Add(new Label(text, position.X, position.Y, rotation));
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}
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}
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private static string GetLatitudeLabelText(double value, string labelFormat)
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{
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return GetLabelText(value, labelFormat, "NS");
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}
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private static string GetLongitudeLabelText(double value, string labelFormat)
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{
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return GetLabelText(Location.NormalizeLongitude(value), labelFormat, "EW");
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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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if (value < -1e-8) // ~1 mm
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{
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value = -value;
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hemisphere = hemispheres[1];
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}
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var seconds = (int)Math.Round(value * 3600d);
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return string.Format(CultureInfo.InvariantCulture,
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labelFormat, hemisphere, seconds / 3600, seconds / 60 % 60, seconds % 60);
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}
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}
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private bool DrawMeridian(PathFigureCollection figures, double lon,
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double latStep, ref double minLat, ref double maxLat)
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{
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var points = new List<Point>();
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var visible = false;
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for (var lat = minLat + latStep; lat < maxLat; lat += latStep)
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{
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var p = ParentMap.LocationToView(lat, lon);
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points.Add(p);
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visible = visible || ParentMap.InsideViewBounds(p);
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}
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for (var lat = minLat; lat >= -90d; lat -= latStep)
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{
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var p = ParentMap.LocationToView(lat, lon);
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points.Insert(0, p);
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if (!ParentMap.InsideViewBounds(p)) break;
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minLat = lat;
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visible = true;
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}
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for (var lat = maxLat; lat <= 90d; lat += latStep)
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{
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var p = ParentMap.LocationToView(lat, lon);
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points.Add(p);
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if (!ParentMap.InsideViewBounds(p)) break;
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maxLat = lat;
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visible = true;
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}
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if (visible && points.Count >= 2)
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{
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figures.Add(CreatePolylineFigure(points));
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}
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return visible;
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}
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private void AddLabel(List<Label> labels, string labelFormat, double lat, double lon, Point position, double rotation)
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{
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if (lat > -90d && lat < 90d && ParentMap.InsideViewBounds(position))
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{
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rotation = ((rotation + ParentMap.ViewTransform.Rotation) % 360d + 540d) % 360d - 180d;
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if (rotation < -90d)
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{
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rotation += 180d;
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}
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else if (rotation > 90d)
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{
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rotation -= 180d;
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}
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var text = GetLatitudeLabelText(lat, labelFormat) +
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"\n" + GetLongitudeLabelText(lon, labelFormat);
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labels.Add(new Label(text, position.X, position.Y, rotation));
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}
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}
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private static string GetLatitudeLabelText(double value, string labelFormat)
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{
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return GetLabelText(value, labelFormat, "NS");
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}
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private static string GetLongitudeLabelText(double value, string labelFormat)
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{
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return GetLabelText(Location.NormalizeLongitude(value), labelFormat, "EW");
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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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if (value < -1e-8) // ~1 mm
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{
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value = -value;
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hemisphere = hemispheres[1];
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}
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var seconds = (int)Math.Round(value * 3600d);
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|
||||
return string.Format(CultureInfo.InvariantCulture,
|
||||
labelFormat, hemisphere, seconds / 3600, seconds / 60 % 60, seconds % 60);
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue