mirror of
https://github.com/ClemensFischer/XAML-Map-Control.git
synced 2026-02-20 14:44:56 +01:00
314 lines
11 KiB
C#
314 lines
11 KiB
C#
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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#if WPF
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using System.Windows;
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using System.Windows.Media;
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#elif UWP
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using Windows.UI.Xaml;
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using Windows.UI.Xaml.Media;
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#elif WINUI
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using Microsoft.UI.Xaml;
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using Microsoft.UI.Xaml.Media;
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#elif AVALONIA
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using Avalonia;
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using Avalonia.Media;
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using Brush = Avalonia.Media.IBrush;
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using PathFigureCollection = Avalonia.Media.PathFigures;
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#endif
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namespace MapControl
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{
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/// <summary>
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/// Draws a graticule overlay.
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/// </summary>
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public partial class MapGraticule
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{
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private class Label(string latText, string lonText, double x, double y, double rotation)
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{
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public string LatitudeText => latText;
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public string LongitudeText => lonText;
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public double X => x;
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public double Y => y;
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public double Rotation => rotation;
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}
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public static readonly DependencyProperty MinLineDistanceProperty =
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DependencyPropertyHelper.Register<MapGraticule, double>(nameof(MinLineDistance), 150d);
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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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public double MinLineDistance
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{
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get => (double)GetValue(MinLineDistanceProperty);
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set => SetValue(MinLineDistanceProperty, value);
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}
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public double StrokeThickness
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{
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get => (double)GetValue(StrokeThicknessProperty);
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set => SetValue(StrokeThicknessProperty, value);
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}
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public Brush Foreground
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{
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get => (Brush)GetValue(ForegroundProperty);
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set => SetValue(ForegroundProperty, value);
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}
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public FontFamily FontFamily
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{
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get => (FontFamily)GetValue(FontFamilyProperty);
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set => SetValue(FontFamilyProperty, value);
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}
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public double FontSize
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{
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get => (double)GetValue(FontSizeProperty);
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set => SetValue(FontSizeProperty, value);
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}
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private void DrawGraticule(PathFigureCollection figures, List<Label> labels)
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{
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if (ParentMap.MapProjection.IsNormalCylindrical)
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{
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DrawNormalGraticule(figures, labels);
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}
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else
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{
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DrawNonNormalGraticule(figures, labels);
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}
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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 latLabelStart = Math.Ceiling(southWest.Latitude / lineDistance) * lineDistance;
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var lonLabelStart = Math.Ceiling(southWest.Longitude / lineDistance) * lineDistance;
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for (var lat = latLabelStart; 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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}
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for (var lon = lonLabelStart; 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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for (var lat = latLabelStart; 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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private void DrawNonNormalGraticule(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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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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minLat = Math.Ceiling(minLat / lineDistance) * lineDistance;
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maxLat = Math.Floor(maxLat / lineDistance) * lineDistance;
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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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}
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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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labels.Add(new Label(
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GetLabelText(lat, labelFormat, "NS"),
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GetLabelText(Location.NormalizeLongitude(lon), labelFormat, "EW"),
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position.X, position.Y, rotation));
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}
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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 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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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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private static PathFigure CreateLineFigure(Point p1, Point p2)
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{
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var figure = new PathFigure
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{
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StartPoint = p1,
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IsFilled = false
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};
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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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