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ClemensFischer
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152 changed files with 11962 additions and 12115 deletions
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@ -6,134 +6,133 @@ using System.Windows.Media;
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using Avalonia;
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#endif
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namespace MapControl
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{
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/// <summary>
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/// Implements a map projection, a transformation between geographic coordinates,
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/// i.e. latitude and longitude in degrees, and cartesian map coordinates in meters.
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/// See https://en.wikipedia.org/wiki/Map_projection.
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/// </summary>
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namespace MapControl;
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/// <summary>
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/// Implements a map projection, a transformation between geographic coordinates,
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/// i.e. latitude and longitude in degrees, and cartesian map coordinates in meters.
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/// See https://en.wikipedia.org/wiki/Map_projection.
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/// </summary>
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#if UWP || WINUI
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[Windows.Foundation.Metadata.CreateFromString(MethodName = "Parse")]
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[Windows.Foundation.Metadata.CreateFromString(MethodName = "Parse")]
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#else
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[System.ComponentModel.TypeConverter(typeof(MapProjectionConverter))]
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[System.ComponentModel.TypeConverter(typeof(MapProjectionConverter))]
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#endif
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public abstract class MapProjection
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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 Wgs84Flattening = 1d / 298.257223563;
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public const double Wgs84MeterPerDegree = Wgs84EquatorialRadius * Math.PI / 180d;
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public static MapProjectionFactory Factory
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{
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public const double Wgs84EquatorialRadius = 6378137d;
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public const double Wgs84Flattening = 1d / 298.257223563;
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public const double Wgs84MeterPerDegree = Wgs84EquatorialRadius * Math.PI / 180d;
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get => field ??= new MapProjectionFactory();
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set;
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}
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public static MapProjectionFactory Factory
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/// <summary>
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/// Creates a MapProjection instance from a CRS identifier string.
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/// </summary>
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public static MapProjection Parse(string crsId)
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{
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return Factory.GetProjection(crsId);
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}
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public override string ToString() => CrsId;
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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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public double EquatorialRadius { get; protected set; } = Wgs84EquatorialRadius;
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public double Flattening { get; protected set; } = Wgs84Flattening;
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public double ScaleFactor { get; protected set; } = 1d;
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public double CentralMeridian { get; protected set; }
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public double LatitudeOfOrigin { get; protected set; }
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public double FalseEasting { get; protected set; }
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public double FalseNorthing { get; protected set; }
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public bool IsNormalCylindrical { get; protected set; }
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/// <summary>
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/// Gets the grid convergence angle in degrees at the specified geographic coordinates.
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/// Used for rotating the Rect resulting from BoundingBoxToMap in non-normal-cylindrical
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/// projections, i.e. Transverse Mercator and Polar Stereographic.
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/// </summary>
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public virtual double GridConvergence(double latitude, double longitude) => 0d;
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/// <summary>
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/// Gets the relative transform at the specified geographic coordinates.
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/// The returned Matrix represents the local relative scale and rotation.
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/// </summary>
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public virtual Matrix RelativeTransform(double latitude, double longitude)
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{
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var transform = new Matrix(ScaleFactor, 0d, 0d, ScaleFactor, 0d, 0d);
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transform.Rotate(-GridConvergence(latitude, longitude));
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return transform;
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}
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/// <summary>
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/// Transforms geographic coordinates to a Point in projected map coordinates.
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/// </summary>
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public abstract Point LocationToMap(double latitude, double longitude);
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/// <summary>
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/// Transforms projected map coordinates to a Location in geographic coordinates.
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/// </summary>
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public abstract Location MapToLocation(double x, double y);
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/// <summary>
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/// Gets the relative transform at the specified geographic Location.
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/// </summary>
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public Matrix RelativeTransform(Location location) => RelativeTransform(location.Latitude, location.Longitude);
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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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/// </summary>
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public Point LocationToMap(Location location) => LocationToMap(location.Latitude, location.Longitude);
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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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/// </summary>
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public Location MapToLocation(Point point) => MapToLocation(point.X, point.Y);
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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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/// with an optional rotation angle in degrees for non-normal-cylindrical projections.
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/// </summary>
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public (Rect, double) BoundingBoxToMap(BoundingBox boundingBox)
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{
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Rect rect;
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var rotation = 0d;
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var southWest = LocationToMap(boundingBox.South, boundingBox.West);
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var northEast = LocationToMap(boundingBox.North, boundingBox.East);
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if (IsNormalCylindrical)
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{
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get => field ??= new MapProjectionFactory();
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set;
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rect = new Rect(southWest.X, southWest.Y, northEast.X - southWest.X, northEast.Y - southWest.Y);
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}
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else
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{
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var southEast = LocationToMap(boundingBox.South, boundingBox.East);
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var northWest = LocationToMap(boundingBox.North, boundingBox.West);
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var west = new Point((southWest.X + northWest.X) / 2d, (southWest.Y + northWest.Y) / 2d);
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var east = new Point((southEast.X + northEast.X) / 2d, (southEast.Y + northEast.Y) / 2d);
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var south = new Point((southWest.X + southEast.X) / 2d, (southWest.Y + southEast.Y) / 2d);
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var north = new Point((northWest.X + northEast.X) / 2d, (northWest.Y + northEast.Y) / 2d);
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var dxWidth = east.X - west.X;
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var dyWidth = east.Y - west.Y;
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var dxHeight = north.X - south.X;
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var dyHeight = north.Y - south.Y;
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var width = Math.Sqrt(dxWidth * dxWidth + dyWidth * dyWidth);
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var height = Math.Sqrt(dxHeight * dxHeight + dyHeight * dyHeight);
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var x = (south.X + north.X - width) / 2d; // cx-w/2
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var y = (south.Y + north.Y - height) / 2d; // cy-h/2
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rect = new Rect(x, y, width, height);
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rotation = Math.Atan2(-dxHeight, dyHeight) * 180d / Math.PI;
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}
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/// <summary>
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/// Creates a MapProjection instance from a CRS identifier string.
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/// </summary>
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public static MapProjection Parse(string crsId)
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{
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return Factory.GetProjection(crsId);
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}
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public override string ToString() => CrsId;
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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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public double EquatorialRadius { get; protected set; } = Wgs84EquatorialRadius;
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public double Flattening { get; protected set; } = Wgs84Flattening;
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public double ScaleFactor { get; protected set; } = 1d;
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public double CentralMeridian { get; protected set; }
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public double LatitudeOfOrigin { get; protected set; }
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public double FalseEasting { get; protected set; }
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public double FalseNorthing { get; protected set; }
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public bool IsNormalCylindrical { get; protected set; }
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/// <summary>
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/// Gets the grid convergence angle in degrees at the specified geographic coordinates.
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/// Used for rotating the Rect resulting from BoundingBoxToMap in non-normal-cylindrical
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/// projections, i.e. Transverse Mercator and Polar Stereographic.
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/// </summary>
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public virtual double GridConvergence(double latitude, double longitude) => 0d;
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/// <summary>
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/// Gets the relative transform at the specified geographic coordinates.
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/// The returned Matrix represents the local relative scale and rotation.
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/// </summary>
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public virtual Matrix RelativeTransform(double latitude, double longitude)
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{
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var transform = new Matrix(ScaleFactor, 0d, 0d, ScaleFactor, 0d, 0d);
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transform.Rotate(-GridConvergence(latitude, longitude));
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return transform;
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}
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/// <summary>
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/// Transforms geographic coordinates to a Point in projected map coordinates.
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/// </summary>
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public abstract Point LocationToMap(double latitude, double longitude);
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/// <summary>
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/// Transforms projected map coordinates to a Location in geographic coordinates.
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/// </summary>
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public abstract Location MapToLocation(double x, double y);
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/// <summary>
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/// Gets the relative transform at the specified geographic Location.
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/// </summary>
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public Matrix RelativeTransform(Location location) => RelativeTransform(location.Latitude, location.Longitude);
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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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/// </summary>
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public Point LocationToMap(Location location) => LocationToMap(location.Latitude, location.Longitude);
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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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/// </summary>
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public Location MapToLocation(Point point) => MapToLocation(point.X, point.Y);
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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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/// with an optional rotation angle in degrees for non-normal-cylindrical projections.
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/// </summary>
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public (Rect, double) BoundingBoxToMap(BoundingBox boundingBox)
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{
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Rect rect;
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var rotation = 0d;
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var southWest = LocationToMap(boundingBox.South, boundingBox.West);
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var northEast = LocationToMap(boundingBox.North, boundingBox.East);
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if (IsNormalCylindrical)
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{
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rect = new Rect(southWest.X, southWest.Y, northEast.X - southWest.X, northEast.Y - southWest.Y);
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}
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else
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{
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var southEast = LocationToMap(boundingBox.South, boundingBox.East);
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var northWest = LocationToMap(boundingBox.North, boundingBox.West);
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var west = new Point((southWest.X + northWest.X) / 2d, (southWest.Y + northWest.Y) / 2d);
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var east = new Point((southEast.X + northEast.X) / 2d, (southEast.Y + northEast.Y) / 2d);
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var south = new Point((southWest.X + southEast.X) / 2d, (southWest.Y + southEast.Y) / 2d);
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var north = new Point((northWest.X + northEast.X) / 2d, (northWest.Y + northEast.Y) / 2d);
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var dxWidth = east.X - west.X;
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var dyWidth = east.Y - west.Y;
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var dxHeight = north.X - south.X;
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var dyHeight = north.Y - south.Y;
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var width = Math.Sqrt(dxWidth * dxWidth + dyWidth * dyWidth);
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var height = Math.Sqrt(dxHeight * dxHeight + dyHeight * dyHeight);
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var x = (south.X + north.X - width) / 2d; // cx-w/2
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var y = (south.Y + north.Y - height) / 2d; // cy-h/2
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rect = new Rect(x, y, width, height);
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rotation = Math.Atan2(-dxHeight, dyHeight) * 180d / Math.PI;
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}
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return (rect, rotation);
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}
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return (rect, rotation);
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}
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}
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