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Improved MapProjections

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This commit is contained in:
ClemensF 2019-10-25 19:56:23 +02:00
parent 82470435c7
commit 716cf950f3
6 changed files with 66 additions and 52 deletions
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62
MapProjections/Shared/GeoApiProjection.cs
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@ -19,15 +19,15 @@ namespace MapControl.Projections
/// </summary>
public class GeoApiProjection : MapProjection
{
private IProjectedCoordinateSystem coordinateSystem;
private ICoordinateSystem coordinateSystem;
public IMathTransform MathTransform { get; private set; }
public IMathTransform InverseTransform { get; private set; }
public IMathTransform LocationToPointTransform { get; private set; }
public IMathTransform PointToLocationTransform { get; private set; }
/// <summary>
/// Gets or sets the IProjectedCoordinateSystem of the MapProjection.
/// </summary>
public IProjectedCoordinateSystem CoordinateSystem
public ICoordinateSystem CoordinateSystem
{
get { return coordinateSystem; }
set
@ -39,43 +39,45 @@ namespace MapControl.Projections
coordinateSystem = value;
var coordinateTransform = new CoordinateTransformationFactory()
.CreateFromCoordinateSystems(GeographicCoordinateSystem.WGS84, coordinateSystem);
var transformFactory = new CoordinateTransformationFactory();
MathTransform = coordinateTransform.MathTransform;
InverseTransform = MathTransform.Inverse();
LocationToPointTransform = transformFactory
.CreateFromCoordinateSystems(GeographicCoordinateSystem.WGS84, coordinateSystem)
.MathTransform;
PointToLocationTransform = transformFactory
.CreateFromCoordinateSystems(coordinateSystem, GeographicCoordinateSystem.WGS84)
.MathTransform;
CrsId = (!string.IsNullOrEmpty(coordinateSystem.Authority) && coordinateSystem.AuthorityCode > 0)
? string.Format("{0}:{1}", coordinateSystem.Authority, coordinateSystem.AuthorityCode)
: null;
if (!IsWebMercator)
{
IsWebMercator = CrsId == "EPSG:3857" || CrsId == "EPSG:900913";
}
IsWebMercator = CrsId == "EPSG:3857" || CrsId == "EPSG:900913";
var projection = coordinateSystem.Projection;
var scaleFactor = projection.GetParameter("scale_factor");
var projectedCoordinateSystem = coordinateSystem as IProjectedCoordinateSystem;
if (scaleFactor != null)
{
TrueScale = scaleFactor.Value * Wgs84MetersPerDegree;
}
if (!IsNormalCylindrical)
if (projectedCoordinateSystem != null)
{
var projection = projectedCoordinateSystem.Projection;
var centralMeridian = projection.GetParameter("central_meridian") ?? projection.GetParameter("longitude_of_origin");
var centralParallel = projection.GetParameter("latitude_of_origin") ?? projection.GetParameter("central_parallel");
var falseEasting = projection.GetParameter("false_easting");
var falseNorthing = projection.GetParameter("false_northing");
var scaleFactor = projection.GetParameter("scale_factor");
if (centralMeridian != null && centralMeridian.Value == 0d &&
IsNormalCylindrical =
centralMeridian != null && centralMeridian.Value == 0d &&
centralParallel != null && centralParallel.Value == 0d &&
(falseEasting == null || falseEasting.Value == 0d) &&
(falseNorthing == null || falseNorthing.Value == 0d))
{
IsNormalCylindrical = true;
}
(falseNorthing == null || falseNorthing.Value == 0d);
TrueScale = (scaleFactor != null ? scaleFactor.Value : 1d) * Wgs84MetersPerDegree;
}
else
{
IsNormalCylindrical = true;
TrueScale = 1d;
}
}
}
@ -88,29 +90,29 @@ namespace MapControl.Projections
public string WKT
{
get { return CoordinateSystem?.WKT; }
set { CoordinateSystem = (IProjectedCoordinateSystem)new CoordinateSystemFactory().CreateFromWkt(value); }
set { CoordinateSystem = new CoordinateSystemFactory().CreateFromWkt(value); }
}
public override Point LocationToPoint(Location location)
{
if (MathTransform == null)
if (LocationToPointTransform == null)
{
throw new InvalidOperationException("The CoordinateSystem property is not set.");
}
var coordinate = MathTransform.Transform(new Coordinate(location.Longitude, location.Latitude));
var coordinate = LocationToPointTransform.Transform(new Coordinate(location.Longitude, location.Latitude));
return new Point(coordinate.X, coordinate.Y);
}
public override Location PointToLocation(Point point)
{
if (InverseTransform == null)
if (PointToLocationTransform == null)
{
throw new InvalidOperationException("The CoordinateSystem property is not set.");
}
var coordinate = InverseTransform.Transform(new Coordinate(point.X, point.Y));
var coordinate = PointToLocationTransform.Transform(new Coordinate(point.X, point.Y));
return new Location(coordinate.Y, coordinate.X);
}