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Version 4.16.0. Improved MapProjection.

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ClemensF 2019-12-12 19:23:41 +01:00
parent 60e0093785
commit 12566506f8
14 changed files with 136 additions and 121 deletions
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59
MapControl/Shared/MapProjection.cs
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@ -3,6 +3,7 @@
// Licensed under the Microsoft Public License (Ms-PL)
using System;
using System.Globalization;
#if WINDOWS_UWP
using Windows.Foundation;
#else
@ -18,7 +19,6 @@ namespace MapControl
public abstract class MapProjection
{
public const int TileSize = 256;
public const double PixelPerDegree = TileSize / 360d;
public const double Wgs84EquatorialRadius = 6378137d;
public const double Wgs84Flattening = 1d / 298.257223563;
@ -29,34 +29,40 @@ namespace MapControl
/// <summary>
/// Gets or sets the WMS 1.3.0 CRS identifier.
/// </summary>
public string CrsId { get; protected set; }
/// <summary>
/// Indicates if a lat/lon coordinate system is used for the WMS BBOX query parameter,
/// like e.g. in an EquirectangularProjection with CrsId="EPSG:4326" (but not CrsId="CRS:84").
/// </summary>
public bool HasLatLonBoundingBox { get; protected set; }
public string CrsId { get; set; }
/// <summary>
/// Indicates if this is a normal cylindrical projection.
/// </summary>
public bool IsNormalCylindrical { get; protected set; }
public virtual bool IsNormalCylindrical
{
get { return true; }
}
/// <summary>
/// Indicates if this is a web mercator projection, i.e. compatible with MapTileLayer.
/// </summary>
public bool IsWebMercator { get; protected set; }
public virtual bool IsWebMercator
{
get { return false; }
}
/// <summary>
/// Gets the absolute value of the minimum and maximum latitude that can be transformed.
/// </summary>
public virtual double MaxLatitude
{
get { return 90d; }
}
/// <summary>
/// Gets the scale factor from geographic to cartesian coordinates, on the line of true scale of a
/// cylindrical projection (usually the equator), or at the projection center of an azimuthal projection.
/// </summary>
public double TrueScale { get; protected set; } = Wgs84MetersPerDegree;
/// <summary>
/// Gets the absolute value of the minimum and maximum latitude that can be transformed.
/// </summary>
public double MaxLatitude { get; protected set; } = 90d;
public virtual double TrueScale
{
get { return Wgs84MetersPerDegree; }
}
/// <summary>
/// Gets the projection center. Only relevant for azimuthal pprojections.
@ -152,13 +158,32 @@ namespace MapControl
return RectToBoundingBox(rect);
}
/// <summary>
/// Gets the CRS parameter value for a WMS GetMap request.
/// </summary>
public virtual string GetCrsValue()
{
return CrsId.StartsWith("AUTO:") || CrsId.StartsWith("AUTO2:")
? string.Format(CultureInfo.InvariantCulture, "{0},1,{1},{2}", CrsId, ProjectionCenter.Longitude, ProjectionCenter.Latitude)
: CrsId;
}
/// <summary>
/// Gets the BBOX parameter value for a WMS GetMap request.
/// </summary>
public virtual string GetBboxValue(Rect rect)
{
return string.Format(CultureInfo.InvariantCulture,
"{0},{1},{2},{3}", rect.X, rect.Y, (rect.X + rect.Width), (rect.Y + rect.Height));
}
/// <summary>
/// Sets ProjectionCenter, ViewportScale, ViewportTransform and InverseViewportTransform.
/// </summary>
public void SetViewportTransform(Location projectionCenter, Location mapCenter, Point viewportCenter, double zoomLevel, double heading)
{
ProjectionCenter = projectionCenter;
ViewportScale = Math.Pow(2d, zoomLevel) * PixelPerDegree / TrueScale;
ViewportScale = Math.Pow(2d, zoomLevel) * TileSize / (360d * TrueScale);
var center = LocationToPoint(mapCenter);
var matrix = CreateTransformMatrix(center, ViewportScale, -ViewportScale, heading, viewportCenter);