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https://github.com/ClemensFischer/XAML-Map-Control.git
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118 lines
4 KiB
C#
118 lines
4 KiB
C#
// XAML Map Control - https://github.com/ClemensFischer/XAML-Map-Control
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// © 2021 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.Globalization;
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#if WINUI || UWP
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using Windows.Foundation;
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#else
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using System.Windows;
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#endif
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namespace MapControl
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{
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/// <summary>
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/// Defines a map projection between geographic coordinates and cartesian map coordinates.
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/// </summary>
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public abstract class MapProjection
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{
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public const double Wgs84EquatorialRadius = 6378137d;
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public const double Wgs84MetersPerDegree = Wgs84EquatorialRadius * Math.PI / 180d;
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public const double Wgs84Flattening = 1d / 298.257223563;
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public static readonly double Wgs84Eccentricity = Math.Sqrt((2d - Wgs84Flattening) * Wgs84Flattening);
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/// <summary>
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/// Gets or sets the WMS 1.3.0 CRS identifier.
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/// </summary>
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public string CrsId { get; set; } = string.Empty;
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/// <summary>
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/// Gets or sets the projection center.
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/// </summary>
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public Location Center { get; set; } = new Location();
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/// <summary>
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/// Indicates if this is a normal cylindrical projection.
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/// </summary>
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public virtual bool IsNormalCylindrical
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{
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get { return false; }
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}
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/// <summary>
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/// Indicates if this is a web mercator projection, i.e. compatible with MapTileLayer.
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/// </summary>
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public virtual bool IsWebMercator
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{
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get { return false; }
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}
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/// <summary>
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/// Gets the absolute value of the minimum and maximum latitude that can be transformed.
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/// </summary>
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public virtual double MaxLatitude
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{
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get { return 90d; }
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}
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/// <summary>
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/// Gets the relative map scale at the specified Location.
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/// </summary>
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public virtual Vector GetRelativeScale(Location location)
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{
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return new Vector(1d, 1d);
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}
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/// <summary>
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/// Transforms a Location in geographic coordinates to a Point in cartesian map coordinates.
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/// </summary>
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public abstract Point LocationToMap(Location location);
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/// <summary>
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/// Transforms a Point in cartesian map coordinates to a Location in geographic coordinates.
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/// </summary>
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public abstract Location MapToLocation(Point point);
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/// <summary>
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/// Transforms a BoundingBox in geographic coordinates to a Rect in cartesian map coordinates.
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/// </summary>
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public virtual Rect BoundingBoxToRect(BoundingBox boundingBox)
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{
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return new Rect(
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LocationToMap(new Location(boundingBox.South, boundingBox.West)),
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LocationToMap(new Location(boundingBox.North, boundingBox.East)));
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}
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/// <summary>
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/// Transforms a Rect in cartesian map coordinates to a BoundingBox in geographic coordinates.
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/// </summary>
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public virtual BoundingBox RectToBoundingBox(Rect rect)
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{
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var sw = MapToLocation(new Point(rect.X, rect.Y));
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var ne = MapToLocation(new Point(rect.X + rect.Width, rect.Y + rect.Height));
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return new BoundingBox(sw.Latitude, sw.Longitude, ne.Latitude, ne.Longitude);
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}
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/// <summary>
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/// Gets the CRS parameter value for a WMS GetMap request.
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/// </summary>
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public virtual string GetCrsValue()
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{
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return CrsId.StartsWith("AUTO:") || CrsId.StartsWith("AUTO2:")
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? string.Format(CultureInfo.InvariantCulture, "{0},1,{1},{2}", CrsId, Center.Longitude, Center.Latitude)
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: CrsId;
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}
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/// <summary>
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/// Gets the BBOX parameter value for a WMS GetMap request.
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/// </summary>
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public virtual string GetBboxValue(Rect rect)
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{
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return string.Format(CultureInfo.InvariantCulture,
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"{0},{1},{2},{3}", rect.X, rect.Y, (rect.X + rect.Width), (rect.Y + rect.Height));
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}
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}
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}
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