Example usage for org.apache.commons.math3.geometry.spherical.twod SphericalPolygonsSet getBoundaryLoops

Introduction

In this page you can find the example usage for org.apache.commons.math3.geometry.spherical.twod SphericalPolygonsSet getBoundaryLoops.

Prototype

public List<Vertex> getBoundaryLoops() throws MathIllegalStateException 

Source Link

Document

Get the boundary loops of the polygon.

Usage

From source file:org.orekit.models.earth.tessellation.InsideFinder.java

/** {@inheritDoc} */
@Override/*from   w  w  w.j  a va 2s . c  om*/
public void visitLeafNode(final BSPTree<Sphere2D> node) {

    // we have already found a good point
    if (insidePointFirstChoice != null) {
        return;
    }

    if ((Boolean) node.getAttribute()) {

        // transform this inside leaf cell into a simple convex polygon
        final SphericalPolygonsSet convex = new SphericalPolygonsSet(
                node.pruneAroundConvexCell(Boolean.TRUE, Boolean.FALSE, null), zone.getTolerance());

        // extract the start of the single loop boundary of the convex cell
        final List<Vertex> boundary = convex.getBoundaryLoops();
        final Vertex start = boundary.get(0);
        int n = 0;
        Vector3D sumB = Vector3D.ZERO;
        for (Edge e = start.getOutgoing(); n == 0 || e.getStart() != start; e = e.getEnd().getOutgoing()) {
            sumB = new Vector3D(1, sumB, e.getLength(), e.getCircle().getPole());
            n++;
        }

        final S2Point candidate = new S2Point(sumB);

        // check the candidate point is really considered inside
        // it may appear outside if the current leaf cell is very thin
        // and checkPoint selects another (very close) tree leaf node
        if (zone.checkPoint(candidate) == Location.INSIDE) {
            insidePointFirstChoice = candidate;
        } else {
            insidePointSecondChoice = candidate;
        }

    }

}

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