mirror of
https://github.com/ClemensFischer/XAML-Map-Control.git
synced 2025-12-06 07:12:04 +01:00
317 lines
13 KiB
C#
317 lines
13 KiB
C#
// XAML Map Control - https://github.com/ClemensFischer/XAML-Map-Control
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// © 2022 Clemens Fischer
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// Licensed under the Microsoft Public License (Ms-PL)
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using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Linq;
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using System.Windows;
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using System.Windows.Media;
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namespace MapControl
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{
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public partial class MapGraticule
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{
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private const double LineInterpolationResolution = 2d;
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private class Label
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{
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public readonly double Position;
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public readonly FormattedText Text;
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public Label(double position, FormattedText text)
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{
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Position = position;
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Text = text;
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}
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}
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static MapGraticule()
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{
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StrokeThicknessProperty.OverrideMetadata(typeof(MapGraticule), new FrameworkPropertyMetadata(0.5));
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}
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protected override void OnViewportChanged(ViewportChangedEventArgs e)
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{
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InvalidateVisual();
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}
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protected override void OnRender(DrawingContext drawingContext)
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{
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var projection = ParentMap?.MapProjection;
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if (projection != null)
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{
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if (projection.IsNormalCylindrical)
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{
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DrawCylindricalGraticule(drawingContext);
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}
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else
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{
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DrawGraticule(drawingContext);
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}
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}
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}
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private void DrawCylindricalGraticule(DrawingContext drawingContext)
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{
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var path = new PathGeometry();
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var typeface = new Typeface(FontFamily, FontStyle, FontWeight, FontStretch);
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var pixelsPerDip = VisualTreeHelper.GetDpi(this).PixelsPerDip;
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var lineDistance = GetLineDistance();
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var labelFormat = GetLabelFormat(lineDistance);
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var boundingBox = ParentMap.ViewRectToBoundingBox(new Rect(ParentMap.RenderSize));
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var latLabelStart = Math.Ceiling(boundingBox.South / lineDistance) * lineDistance;
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var lonLabelStart = Math.Ceiling(boundingBox.West / lineDistance) * lineDistance;
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var latLabels = new List<Label>((int)((boundingBox.North - latLabelStart) / lineDistance) + 1);
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var lonLabels = new List<Label>((int)((boundingBox.East - lonLabelStart) / lineDistance) + 1);
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for (var lat = latLabelStart; lat <= boundingBox.North; lat += lineDistance)
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{
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latLabels.Add(new Label(lat, new FormattedText(
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GetLabelText(lat, labelFormat, "NS"),
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CultureInfo.InvariantCulture, FlowDirection.LeftToRight, typeface, FontSize, Foreground, pixelsPerDip)));
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var p1 = ParentMap.LocationToView(new Location(lat, boundingBox.West));
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var p2 = ParentMap.LocationToView(new Location(lat, boundingBox.East));
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if (MapProjection.IsValid(p1) && MapProjection.IsValid(p2))
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{
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var figure = new PathFigure { StartPoint = p1 };
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figure.Segments.Add(new LineSegment(p2, true));
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path.Figures.Add(figure);
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}
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}
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for (var lon = lonLabelStart; lon <= boundingBox.East; lon += lineDistance)
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{
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lonLabels.Add(new Label(lon, new FormattedText(
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GetLabelText(Location.NormalizeLongitude(lon), labelFormat, "EW"),
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CultureInfo.InvariantCulture, FlowDirection.LeftToRight, typeface, FontSize, Foreground, pixelsPerDip)));
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var p1 = ParentMap.LocationToView(new Location(boundingBox.South, lon));
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var p2 = ParentMap.LocationToView(new Location(boundingBox.North, lon));
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if (MapProjection.IsValid(p1) && MapProjection.IsValid(p2))
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{
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var figure = new PathFigure { StartPoint = p1 };
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figure.Segments.Add(new LineSegment(p2, true));
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path.Figures.Add(figure);
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}
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}
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drawingContext.DrawGeometry(null, CreatePen(), path);
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foreach (var latLabel in latLabels)
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{
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foreach (var lonLabel in lonLabels)
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{
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var position = ParentMap.LocationToView(new Location(latLabel.Position, lonLabel.Position));
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if (MapProjection.IsValid(position))
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{
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DrawLabel(drawingContext, latLabel.Text, lonLabel.Text, position, ParentMap.ViewTransform.Rotation);
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}
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}
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}
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}
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private void DrawGraticule(DrawingContext drawingContext)
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{
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var path = new PathGeometry();
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var typeface = new Typeface(FontFamily, FontStyle, FontWeight, FontStretch);
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var pixelsPerDip = VisualTreeHelper.GetDpi(this).PixelsPerDip;
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var lineDistance = GetLineDistance();
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var labelFormat = GetLabelFormat(lineDistance);
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var centerLon = Math.Floor(ParentMap.Center.Longitude / lineDistance) * lineDistance;
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var minLon = centerLon - lineDistance;
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var maxLon = centerLon + lineDistance;
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var minLat = 0d;
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var maxLat = 0d;
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GetLatitudeRange(lineDistance, ref minLat, ref maxLat);
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var latSegments = (int)Math.Round(Math.Abs(maxLat - minLat) / lineDistance);
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var interpolationCount = Math.Max(1, (int)Math.Ceiling(lineDistance / LineInterpolationResolution));
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var interpolationDistance = lineDistance / interpolationCount;
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var latPoints = latSegments * interpolationCount;
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if (DrawMeridian(path.Figures, centerLon, minLat, interpolationDistance, latPoints))
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{
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while (minLon > centerLon - 180d &&
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DrawMeridian(path.Figures, minLon, minLat, interpolationDistance, latPoints))
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{
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minLon -= lineDistance;
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}
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while (maxLon <= centerLon + 180d &&
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DrawMeridian(path.Figures, maxLon, minLat, interpolationDistance, latPoints))
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{
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maxLon += lineDistance;
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}
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}
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var lonSegments = (int)Math.Round(Math.Abs(maxLon - minLon) / lineDistance);
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for (var s = minLat > -90d ? 0 : 1; s < latSegments; s++)
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{
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var lat = minLat + s * lineDistance;
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var lon = minLon;
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var points = new List<Point>();
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var p = ParentMap.LocationToView(new Location(lat, lon));
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if (MapProjection.IsValid(p))
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{
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points.Add(p);
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}
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for (int i = 0; i < lonSegments; i++)
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{
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for (int j = 1; j <= interpolationCount; j++)
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{
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lon = minLon + i * lineDistance + j * interpolationDistance;
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p = ParentMap.LocationToView(new Location(lat, lon));
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if (MapProjection.IsValid(p))
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{
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points.Add(p);
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}
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}
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if (p.X >= 0d && p.X <= ParentMap.RenderSize.Width &&
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p.Y >= 0d && p.Y <= ParentMap.RenderSize.Height)
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{
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DrawLabel(drawingContext, typeface, pixelsPerDip, p, new Location(lat, lon), labelFormat);
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}
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}
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if (points.Count >= 2)
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{
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var figure = new PathFigure { StartPoint = points.First() };
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figure.Segments.Add(new PolyLineSegment(points.Skip(1), true));
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path.Figures.Add(figure);
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}
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}
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drawingContext.DrawGeometry(null, CreatePen(), path);
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}
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private bool DrawMeridian(PathFigureCollection figures,
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double longitude, double startLatitude, double deltaLatitude, int numPoints)
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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 (int i = 0; i <= numPoints; i++)
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{
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var p = ParentMap.LocationToView(new Location(startLatitude + i * deltaLatitude, longitude));
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if (MapProjection.IsValid(p))
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{
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visible = visible ||
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p.X >= 0d && p.X <= ParentMap.RenderSize.Width &&
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p.Y >= 0d && p.Y <= ParentMap.RenderSize.Height;
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points.Add(p);
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}
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}
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if (points.Count >= 2)
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{
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var figure = new PathFigure { StartPoint = points.First() };
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figure.Segments.Add(new PolyLineSegment(points.Skip(1), true));
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figures.Add(figure);
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}
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return visible;
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}
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private void DrawLabel(DrawingContext drawingContext, Typeface typeface, double pixelsPerDip,
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Point position, Location location, string labelFormat)
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{
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var latText = new FormattedText(GetLabelText(location.Latitude, labelFormat, "NS"),
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CultureInfo.InvariantCulture, FlowDirection.LeftToRight, typeface, FontSize, Foreground, pixelsPerDip);
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var lonText = new FormattedText(GetLabelText(location.Longitude, labelFormat, "EW"),
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CultureInfo.InvariantCulture, FlowDirection.LeftToRight, typeface, FontSize, Foreground, pixelsPerDip);
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location.Longitude += latText.Width / PixelPerLongitudeDegree(location);
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var p = ParentMap.LocationToView(location);
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if (MapProjection.IsValid(p))
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{
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DrawLabel(drawingContext, latText, lonText, position, Vector.AngleBetween(new Vector(1d, 0d), p - position));
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}
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}
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private void DrawLabel(DrawingContext drawingContext,
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FormattedText latitudeLabel, FormattedText longitudeLabel, Point position, double rotation)
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{
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var x = position.X + StrokeThickness / 2d + 2d;
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var y1 = position.Y - StrokeThickness / 2d - latitudeLabel.Height;
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var y2 = position.Y + StrokeThickness / 2d;
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drawingContext.PushTransform(new RotateTransform(rotation, position.X, position.Y));
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drawingContext.DrawText(latitudeLabel, new Point(x, y1));
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drawingContext.DrawText(longitudeLabel, new Point(x, y2));
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drawingContext.Pop();
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}
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private void GetLatitudeRange(double lineDistance, ref double minLatitude, ref double maxLatitude)
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{
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var width = ParentMap.RenderSize.Width;
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var height = ParentMap.RenderSize.Height;
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var northPole = ParentMap.LocationToView(new Location(90d, 0d));
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var southPole = ParentMap.LocationToView(new Location(-90d, 0d));
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if (northPole.X >= 0d && northPole.Y >= 0d && northPole.X <= width && northPole.Y <= height)
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{
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maxLatitude = 90d;
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}
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if (southPole.X >= 0d && southPole.Y >= 0d && southPole.X <= width && southPole.Y <= height)
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{
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minLatitude = -90d;
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}
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if (minLatitude > -90d || maxLatitude < 90d)
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{
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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 / 2d, 0d)),
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ParentMap.ViewToLocation(new Point(width, 0d)),
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ParentMap.ViewToLocation(new Point(width, height / 2d)),
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ParentMap.ViewToLocation(new Point(width, height)),
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ParentMap.ViewToLocation(new Point(width / 2d, height)),
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ParentMap.ViewToLocation(new Point(0d, height)),
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ParentMap.ViewToLocation(new Point(0d, height / 2)),
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};
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var latitudes = locations.Where(loc => loc != null).Select(loc => loc.Latitude);
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var south = -90d;
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var north = 90d;
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if (latitudes.Distinct().Count() >= 2)
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{
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south = latitudes.Min();
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north = latitudes.Max();
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}
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if (minLatitude > -90d)
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{
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minLatitude = Math.Max(Math.Floor(south / lineDistance) * lineDistance, -90d);
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}
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if (maxLatitude < 90d)
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{
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maxLatitude = Math.Min(Math.Ceiling(north / lineDistance) * lineDistance, 90d);
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}
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}
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}
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}
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}
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