public void Filter(ICoordinateSequence seq, int i)
{
double x = seq.GetX(i);
double y = seq.GetY(i);
if (_ctx.IsGeo() && _normalizeGeomCoords)
{
double xNorm = DistanceUtils.NormLonDEG(x);
if (x != xNorm)
{
changed = true;
seq.SetOrdinate(i, Ordinate.X, xNorm);
}
double yNorm = DistanceUtils.NormLatDEG(y);
if (y != yNorm)
{
changed = true;
seq.SetOrdinate(i, Ordinate.Y, yNorm);
}
}
else
{
_ctx.VerifyX(x);
_ctx.VerifyY(y);
}
}
public NtsGeometry(IGeometry geom, NtsSpatialContext ctx, bool dateline180Check)
{
this.ctx = ctx;
//GeometryCollection isn't supported in relate()
if (geom.GetType() == typeof(GeometryCollection))
{
throw new ArgumentException("NtsGeometry does not support GeometryCollection but does support its subclasses.");
}
//NOTE: All this logic is fairly expensive. There are some short-circuit checks though.
if (ctx.IsGeo())
{
//Unwraps the geometry across the dateline so it exceeds the standard geo bounds (-180 to +180).
if (dateline180Check)
{
UnwrapDateline(geom); //potentially modifies geom
}
//If given multiple overlapping polygons, fix it by union
geom = UnionGeometryCollection(geom); //returns same or new geom
Envelope unwrappedEnv = geom.EnvelopeInternal;
//Cuts an unwrapped geometry back into overlaid pages in the standard geo bounds.
geom = CutUnwrappedGeomInto360(geom); //returns same or new geom
Debug.Assert(geom.EnvelopeInternal.Width <= 360);
Debug.Assert(geom.GetType() != typeof(GeometryCollection)); //double check
//note: this bbox may be sub-optimal. If geom is a collection of things near the dateline on both sides then
// the bbox will needlessly span most or all of the globe longitudinally.
// TODO so consider using MultiShape's planned minimal geo bounding box algorithm once implemented.
double envWidth = unwrappedEnv.Width;
//adjust minX and maxX considering the dateline and world wrap
double minX, maxX;
if (envWidth >= 360)
{
minX = -180;
maxX = 180;
}
else
{
minX = unwrappedEnv.MinX;
maxX = DistanceUtils.NormLonDEG(unwrappedEnv.MinX + envWidth);
}
bbox = new RectangleImpl(minX, maxX, unwrappedEnv.MinY, unwrappedEnv.MaxY, ctx);
}
else
{//not geo
Envelope env = geom.EnvelopeInternal;
bbox = new RectangleImpl(env.MinX, env.MaxX, env.MinY, env.MaxY, ctx);
}
var _ = geom.EnvelopeInternal; //ensure envelope is cached internally, which is lazy evaluated. Keeps this thread-safe.
//Check geom validity; use helpful error
// TODO add way to conditionally skip at your peril later
var isValidOp = new IsValidOp(geom);
if (!isValidOp.IsValid)
{
throw new InvalidShapeException(isValidOp.ValidationError.ToString());
}
this.geom = geom;
this._hasArea = !((geom is ILineal) || (geom is IPuntal));
}