private static Boolean CheckTransform(String csName, double lon, double lat, double expectedX, double expectedY, double tolerance)
{
CoordinateTransformFactory ctFactory = new CoordinateTransformFactory();
CoordinateReferenceSystemFactory csFactory = new CoordinateReferenceSystemFactory();
/*
* Create {@link CoordinateReferenceSystem} & CoordinateTransformation.
* Normally this would be carried out once and reused for all transformations
*/
CoordinateReferenceSystem crs = csFactory.CreateFromName(csName);
const String wgs84Param = "+title=long/lat:WGS84 +proj=longlat +ellps=WGS84 +datum=WGS84 +units=degrees";
CoordinateReferenceSystem wgs84 = csFactory.CreateFromParameters("WGS84", wgs84Param);
ICoordinateTransform trans = ctFactory.CreateTransform(wgs84, crs);
/*
* Create input and output points.
* These can be constructed once per thread and reused.
*/
ProjCoordinate p = new ProjCoordinate();
ProjCoordinate p2 = new ProjCoordinate();
p.X = lon;
p.Y = lat;
/*
* Transform point
*/
trans.Transform(p, p2);
return(IsInTolerance(p2, expectedX, expectedY, tolerance));
}
public void TestExplicitTransform()
{
const String csName1 = "EPSG:32636";
const String csName2 = "EPSG:4326";
CoordinateTransformFactory ctFactory = new CoordinateTransformFactory();
CoordinateReferenceSystemFactory csFactory = new CoordinateReferenceSystemFactory();
/*
* Create {@link CoordinateReferenceSystem} & CoordinateTransformation.
* Normally this would be carried out once and reused for all transformations
*/
CoordinateReferenceSystem crs1 = csFactory.CreateFromName(csName1);
CoordinateReferenceSystem crs2 = csFactory.CreateFromName(csName2);
ICoordinateTransform trans = ctFactory.CreateTransform(crs1, crs2);
/*
* Create input and output points.
* These can be constructed once per thread and reused.
*/
ProjCoordinate p1 = new ProjCoordinate();
ProjCoordinate p2 = new ProjCoordinate();
p1.X = 500000;
p1.Y = 4649776.22482;
/*
* Transform point
*/
trans.Transform(p1, p2);
Assert.IsTrue(IsInTolerance(p2, 33, 42, 0.000001));
}
private void onSpatialReferenceChanged()
{
_geoFactory = _geoFactory.Clone();
_geoFactory.SpatialReference = SpatialReference;
foreach (ILayer layer in _layers)
{
if (!layer.SpatialReference.EqualParams(SpatialReference))
{
if (layer.CoordinateTransformation != null)
{
// TODO: do we ever need to support multiple transforms?
throw new InvalidOperationException("The layer already has a coordinate transform.");
}
layer.CoordinateTransformation
= CoordinateTransformFactory.CreateFromCoordinateSystems(layer.SpatialReference,
SpatialReference);
}
}
_extents = null;
raisePropertyChanged(SpatialReferenceProperty.Name);
}
public void testRepeatedTransform()
{
var crsFactory = new CoordinateReferenceSystemFactory();
var src = crsFactory.CreateFromName("epsg:4326");
var dest = crsFactory.CreateFromName("epsg:27700");
var ctf = new CoordinateTransformFactory();
var transform = ctf.CreateTransform(src, dest);
var srcPt = new ProjCoordinate(0.899167, 51.357216);
var destPt = new ProjCoordinate();
transform.Transform(srcPt, destPt);
Console.WriteLine(srcPt + " ==> " + destPt);
// do it again
var destPt2 = new ProjCoordinate();
transform.Transform(srcPt, destPt2);
Console.WriteLine(srcPt + " ==> " + destPt2);
Assert.IsTrue(destPt.Equals(destPt2));
}
