Weird clipping behaviour

[nsiatras]

Hello,

I am trying to clip a polyline. The input and result are as the following image. As you can see the result is not complete, it is exactly half.

Also see:

Before clipping:

After Clipping:

The code I am using is the following

public static ArrayList<Position> ClipPolygon(final ArrayList<double[]> clipper, final ArrayList<double[]> subject)
    {
        ArrayList<Position> result = new ArrayList<>();

        // Create a Polygon for clipper
        com.esri.core.geometry.Polygon clipperPoly = new com.esri.core.geometry.Polygon();
        clipperPoly.startPath(clipper.get(0)[0], clipper.get(0)[1]);
        for (int i = 1; i < clipper.size(); i++)
        {
            clipperPoly.lineTo(clipper.get(i)[0], clipper.get(i)[1]);
        }

        // Create a Polyline for subject
        Polyline line = new Polyline();
        line.startPath(subject.get(0)[0], subject.get(0)[1]);
        for (int i = 1; i < subject.size(); i++)
        {
            line.lineTo(subject.get(i)[0], subject.get(i)[1]);
        }

        // Create a spatial reference object for GCS_WGS_1984.
        SpatialReference sr = SpatialReference.create(4326);

        SimpleGeometryCursor inputGeometries = new SimpleGeometryCursor(line);
        SimpleGeometryCursor intersector = new SimpleGeometryCursor(clipperPoly);

        GeometryCursor outGeoms = OperatorIntersection.local().execute(inputGeometries, intersector, sr, null, -1);

        Geometry geom;
        while ((geom = outGeoms.next()) != null)
        {
            if (geom instanceof Polyline)
            {
                Polyline pLine = (Polyline) geom;

                for (int i = 0; i < pLine.getPathCount(); i++)
                {
                    result.add(new Position(pLine.getPoint(i).getX(), pLine.getPoint(i).getY(), 0));
                }
            }
        }

        return result;
    }

All ideas are welcome

[stolstov]

@nsiatras Result of polyline after intersection is probably a set of disconnected paths. Here is how to visit all paths and vertices in each path:

                for (int ipath = 0; ipath < pLine.getPathCount(); ipath ++)
                {
                    for (int i = pLine.getPathStart(ipath); i < pLine.getPathEnd(ipath); i++)
                    {
                        pLine.getPoint(i).getX();
                        pLine.getPoint(i).getY();
                    }
                }

[nsiatras]

@stolstov Thank you very much for your reply

Edited: It works excellent and I can tell it is very fast! Thanks again!

[stolstov]

@nsiatras If your intent to clip with axis-aligned rectangle (as clipping geometry for display on rectangular screen), then OperatorClip is more optimized for this.