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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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13
MapControl/Shared/MapProjection.cs
View file

@ -5,7 +5,6 @@
using System;
#if WINDOWS_UWP
using Windows.Foundation;
using Windows.UI.Xaml.Media;
#else
using System.Windows;
using System.Windows.Media;
@ -134,9 +133,17 @@ namespace MapControl
/// </summary>
public BoundingBox ViewportRectToBoundingBox(Rect rect)
{
var transform = new MatrixTransform { Matrix = InverseViewportTransform };
var p1 = InverseViewportTransform.Transform(new Point(rect.X, rect.Y));
var p2 = InverseViewportTransform.Transform(new Point(rect.X, rect.Y + rect.Height));
var p3 = InverseViewportTransform.Transform(new Point(rect.X + rect.Width, rect.Y));
var p4 = InverseViewportTransform.Transform(new Point(rect.X + rect.Width, rect.Y + rect.Height));
return RectToBoundingBox(transform.TransformBounds(rect));
rect.X = Math.Min(p1.X, Math.Min(p2.X, Math.Min(p3.X, p4.X)));
rect.Y = Math.Min(p1.Y, Math.Min(p2.Y, Math.Min(p3.Y, p4.Y)));
rect.Width = Math.Max(p1.X, Math.Max(p2.X, Math.Max(p3.X, p4.X))) - rect.X;
rect.Height = Math.Max(p1.Y, Math.Max(p2.Y, Math.Max(p3.Y, p4.Y))) - rect.Y;
return RectToBoundingBox(rect);
}
/// <summary>

3
MapControl/UWP/Matrix.UWP.cs
View file

@ -6,6 +6,9 @@ using System;
namespace MapControl
{
/// <summary>
/// Replaces Windows.UI.Xaml.Media.Matrix to achieve necessary floating point precision.
/// </summary>
public struct Matrix
{
public double M11 { get; set; }

3
MapControl/UWP/Point.UWP.cs
View file

@ -4,6 +4,9 @@
namespace MapControl
{
/// <summary>
/// Replaces Windows.Foundation.Point to achieve necessary floating point precision.
/// </summary>
public struct Point
{
public double X { get; set; }

56
MapProjections/Shared/GeoApiProjection.cs
View file

@ -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";
}
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))
(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);
}

2
MapProjections/Shared/WebMercatorProjection.cs
View file

@ -18,8 +18,6 @@ namespace MapControl.Projections
{
public WebMercatorProjection()
{
IsWebMercator = true;
IsNormalCylindrical = true;
CoordinateSystem = ProjectedCoordinateSystem.WebMercator;
}

35
MapProjections/Shared/WorldMercatorProjection.cs
View file

@ -17,23 +17,24 @@ namespace MapControl.Projections
{
public WorldMercatorProjection()
{
IsNormalCylindrical = true;
WKT = "PROJCS[\"WGS 84 / World Mercator\","
+ "GEOGCS[\"WGS 84\","
+ "DATUM[\"WGS_1984\", SPHEROID[\"WGS 84\", 6378137, 298.257223563, AUTHORITY[\"EPSG\", \"7030\"]], AUTHORITY[\"EPSG\", \"6326\"]],"
+ "PRIMEM[\"Greenwich\", 0, AUTHORITY[\"EPSG\", \"8901\"]],"
+ "UNIT[\"degree\", 0.0174532925199433, AUTHORITY[\"EPSG\", \"9122\"]],"
+ "AUTHORITY[\"EPSG\", \"4326\"]],"
+ "PROJECTION[\"Mercator_1SP\"],"
+ "PARAMETER[\"latitude_of_origin\", 0],"
+ "PARAMETER[\"central_meridian\", 0],"
+ "PARAMETER[\"scale_factor\", 1],"
+ "PARAMETER[\"false_easting\", 0],"
+ "PARAMETER[\"false_northing\", 0],"
+ "UNIT[\"metre\", 1, AUTHORITY[\"EPSG\", \"9001\"]],"
+ "AXIS[\"Easting\", EAST],"
+ "AXIS[\"Northing\", NORTH],"
+ "AUTHORITY[\"EPSG\", \"3395\"]]";
WKT = "PROJCS[\"WGS 84 / World Mercator\"," +
"GEOGCS[\"WGS 84\"," +
"DATUM[\"WGS_1984\"," +
"SPHEROID[\"WGS 84\",6378137,298.257223563,AUTHORITY[\"EPSG\",\"7030\"]]," +
"AUTHORITY[\"EPSG\",\"6326\"]]," +
"PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]]," +
"UNIT[\"degree\",0.0174532925199433,AUTHORITY[\"EPSG\",\"9122\"]]," +
"AUTHORITY[\"EPSG\",\"4326\"]]," +
"PROJECTION[\"Mercator_1SP\"]," +
"PARAMETER[\"latitude_of_origin\",0]," +
"PARAMETER[\"central_meridian\",0]," +
"PARAMETER[\"scale_factor\",1]," +
"PARAMETER[\"false_easting\",0]," +
"PARAMETER[\"false_northing\",0]," +
"UNIT[\"metre\",1,AUTHORITY[\"EPSG\",\"9001\"]]," +
"AXIS[\"Easting\",EAST]," +
"AXIS[\"Northing\",NORTH]," +
"AUTHORITY[\"EPSG\",\"3395\"]]";
}
public override Vector GetMapScale(Location location)