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Unified map projections

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ClemensFischer 2026-02-01 17:25:04 +01:00
parent a4bd11e26d
commit 9fe7dccd68
21 changed files with 370 additions and 377 deletions
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22
MapControl/Shared/MapProjection.cs
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@ -43,16 +43,15 @@ namespace MapControl
/// </summary>
public string CrsId { get; protected set; }
/// <summary>
/// Indicates whether the projection is normal cylindrical, see
/// https://en.wikipedia.org/wiki/Map_projection#Normal_cylindrical.
/// </summary>
public double EquatorialRadius { get; protected set; } = Wgs84EquatorialRadius;
public double Flattening { get; protected set; } = Wgs84Flattening;
public double ScaleFactor { get; protected set; } = 1d;
public double CentralMeridian { get; protected set; }
public double LatitudeOfOrigin { get; protected set; }
public double FalseEasting { get; protected set; }
public double FalseNorthing { get; protected set; }
public bool IsNormalCylindrical { get; protected set; }
public double EquatorialRadius { get; set; } = Wgs84EquatorialRadius;
public double CentralMeridian { get; set; }
public double LatitudeOfOrigin { get; set; }
/// <summary>
/// Gets the grid convergence angle in degrees at the specified geographic coordinates.
/// Used for rotating the Rect resulting from BoundingBoxToMap in non-normal-cylindrical
@ -64,7 +63,12 @@ namespace MapControl
/// Gets the relative transform at the specified geographic coordinates.
/// The returned Matrix represents the local relative scale and rotation.
/// </summary>
public abstract Matrix RelativeTransform(double latitude, double longitude);
public virtual Matrix RelativeTransform(double latitude, double longitude)
{
var transform = new Matrix(ScaleFactor, 0d, 0d, ScaleFactor, 0d, 0d);
transform.Rotate(-GridConvergence(latitude, longitude));
return transform;
}
/// <summary>
/// Transforms geographic coordinates to a Point in projected map coordinates.