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Version 5.0: Separated map projection and view transform.

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ClemensF 2020-03-26 19:08:20 +01:00
parent 53723844a0
commit c7cb2efcdb
47 changed files with 401 additions and 382 deletions
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30
MapProjections/Shared/GeoApiProjection.cs
View file

@ -25,11 +25,11 @@ namespace MapControl.Projections
private ICoordinateSystem coordinateSystem;
private bool isNormalCylindrical;
private bool isWebMercator;
private double trueScale;
private double unitsPerDegree;
private string bboxFormat;
public IMathTransform LocationToPointTransform { get; private set; }
public IMathTransform PointToLocationTransform { get; private set; }
public IMathTransform LocationToMapTransform { get; private set; }
public IMathTransform MapToLocationTransform { get; private set; }
/// <summary>
/// Gets or sets the ICoordinateSystem of the MapProjection.
@ -48,11 +48,11 @@ namespace MapControl.Projections
var transformFactory = new CoordinateTransformationFactory();
LocationToPointTransform = transformFactory
LocationToMapTransform = transformFactory
.CreateFromCoordinateSystems(GeographicCoordinateSystem.WGS84, coordinateSystem)
.MathTransform;
PointToLocationTransform = transformFactory
MapToLocationTransform = transformFactory
.CreateFromCoordinateSystems(coordinateSystem, GeographicCoordinateSystem.WGS84)
.MathTransform;
@ -76,14 +76,14 @@ namespace MapControl.Projections
(falseEasting == null || falseEasting.Value == 0d) &&
(falseNorthing == null || falseNorthing.Value == 0d);
isWebMercator = CrsId == "EPSG:3857" || CrsId == "EPSG:900913";
trueScale = (scaleFactor != null ? scaleFactor.Value : 1d) * Wgs84MetersPerDegree;
unitsPerDegree = (scaleFactor != null ? scaleFactor.Value : 1d) * Wgs84MetersPerDegree;
bboxFormat = "{0},{1},{2},{3}";
}
else
{
isNormalCylindrical = true;
isWebMercator = false;
trueScale = 1d;
unitsPerDegree = 1d;
bboxFormat = "{1},{0},{3},{2}";
}
}
@ -110,31 +110,31 @@ namespace MapControl.Projections
get { return isWebMercator; }
}
public override double TrueScale
public override double UnitsPerDegree
{
get { return trueScale; }
get { return unitsPerDegree; }
}
public override Point LocationToPoint(Location location)
public override Point LocationToMap(Location location)
{
if (LocationToPointTransform == null)
if (LocationToMapTransform == null)
{
throw new InvalidOperationException("The CoordinateSystem property is not set.");
}
var coordinate = LocationToPointTransform.Transform(new Coordinate(location.Longitude, location.Latitude));
var coordinate = LocationToMapTransform.Transform(new Coordinate(location.Longitude, location.Latitude));
return new Point(coordinate.X, coordinate.Y);
}
public override Location PointToLocation(Point point)
public override Location MapToLocation(Point point)
{
if (PointToLocationTransform == null)
if (MapToLocationTransform == null)
{
throw new InvalidOperationException("The CoordinateSystem property is not set.");
}
var coordinate = PointToLocationTransform.Transform(new Coordinate(point.X, point.Y));
var coordinate = MapToLocationTransform.Transform(new Coordinate(point.X, point.Y));
return new Location(coordinate.Y, coordinate.X);
}

10
MapProjections/Shared/PolarStereographicProjection.cs
View file

@ -33,12 +33,12 @@ namespace MapControl.Projections
this.falseNorthing = falseNorthing;
}
public override double TrueScale
public override double UnitsPerDegree
{
get { return scaleFactor * Wgs84MetersPerDegree; }
}
public override Vector GetMapScale(Location location)
public override Vector GetRelativeScale(Location location)
{
var lat = (north ? location.Latitude : -location.Latitude) * Math.PI / 180d;
var a = Wgs84EquatorialRadius;
@ -50,10 +50,10 @@ namespace MapControl.Projections
var m = Math.Cos(lat) / Math.Sqrt(1d - eSinLat * eSinLat);
var k = rho / (a * m);
return new Vector(ViewportScale * k, ViewportScale * k);
return new Vector(k, k);
}
public override Point LocationToPoint(Location location)
public override Point LocationToMap(Location location)
{
var lat = location.Latitude * Math.PI / 180d;
var lon = location.Longitude * Math.PI / 180d;
@ -76,7 +76,7 @@ namespace MapControl.Projections
return new Point(rho * Math.Sin(lon) + falseEasting, rho * Math.Cos(lon) + falseNorthing);
}
public override Location PointToLocation(Point point)
public override Location MapToLocation(Point point)
{
point.X -= falseEasting;
point.Y -= falseNorthing;

4
MapProjections/Shared/WebMercatorProjection.cs
View file

@ -21,11 +21,11 @@ namespace MapControl.Projections
CoordinateSystem = ProjectedCoordinateSystem.WebMercator;
}
public override Vector GetMapScale(Location location)
public override Vector GetRelativeScale(Location location)
{
var k = 1d / Math.Cos(location.Latitude * Math.PI / 180d); // p.44 (7-3)
return new Vector(ViewportScale * k, ViewportScale * k);
return new Vector(k, k);
}
}
}

4
MapProjections/Shared/WorldMercatorProjection.cs
View file

@ -37,13 +37,13 @@ namespace MapControl.Projections
"AUTHORITY[\"EPSG\",\"3395\"]]";
}
public override Vector GetMapScale(Location location)
public override Vector GetRelativeScale(Location location)
{
var lat = location.Latitude * Math.PI / 180d;
var eSinLat = Wgs84Eccentricity * Math.Sin(lat);
var k = Math.Sqrt(1d - eSinLat * eSinLat) / Math.Cos(lat); // p.44 (7-8)
return new Vector(ViewportScale * k, ViewportScale * k);
return new Vector(k, k);
}
}
}