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https://github.com/ClemensFischer/XAML-Map-Control.git
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100 lines
3.6 KiB
C#
100 lines
3.6 KiB
C#
// XAML Map Control - https://github.com/ClemensFischer/XAML-Map-Control
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// Copyright © 2024 Clemens Fischer
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// Licensed under the Microsoft Public License (Ms-PL)
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using System;
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#if WPF
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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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public enum MapProjectionType
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{
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WebMercator, // normal cylindrical projection compatible with MapTileLayer
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NormalCylindrical,
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TransverseCylindrical,
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Azimuthal,
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Other
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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 Wgs84MeterPerDegree = 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 the type of the projection.
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/// </summary>
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public MapProjectionType Type { get; protected set; } = MapProjectionType.Other;
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/// <summary>
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/// Gets the WMS 1.3.0 CRS identifier.
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/// </summary>
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public string CrsId { get; protected set; } = "";
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/// <summary>
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/// Gets or sets an optional projection center.
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/// </summary>
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public virtual Location Center { get; protected internal set; } = new Location();
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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 Point GetRelativeScale(Location location) => new Point(1d, 1d);
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/// <summary>
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/// Transforms a Location in geographic coordinates to a Point in projected map coordinates.
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/// Returns null when the Location can not be transformed.
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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 projected map coordinates to a Location in geographic coordinates.
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/// Returns null when the Point can not be transformed.
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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 projected map coordinates.
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/// Returns null when the BoundingBox can not be transformed.
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/// </summary>
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public virtual Rect? BoundingBoxToMap(BoundingBox boundingBox)
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{
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Rect? mapRect = null;
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var southWest = LocationToMap(new Location(boundingBox.South, boundingBox.West));
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var northEast = LocationToMap(new Location(boundingBox.North, boundingBox.East));
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if (southWest.HasValue && northEast.HasValue)
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{
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mapRect = new Rect(southWest.Value, northEast.Value);
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}
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return mapRect;
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}
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/// <summary>
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/// Transforms a Rect in projected map coordinates to a BoundingBox in geographic coordinates.
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/// Returns null when the MapRect can not be transformed.
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/// </summary>
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public virtual BoundingBox MapToBoundingBox(Rect mapRect)
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{
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BoundingBox boundingBox = null;
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var southWest = MapToLocation(new Point(mapRect.X, mapRect.Y));
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var northEast = MapToLocation(new Point(mapRect.X + mapRect.Width, mapRect.Y + mapRect.Height));
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if (southWest != null && northEast != null)
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{
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boundingBox = new BoundingBox(southWest, northEast);
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}
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return boundingBox;
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}
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}
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}
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