Examples with FaceTriangulation de.fhg.igd.geom.algorithm.FaceTriangulation used on opensource projects

Example 1 with FaceTriangulation

use of de.fhg.igd.geom.algorithm.FaceTriangulation in project hale by halestudio.

the class AreaCalc method triangulate.

/**
 * Triangulates the polygon.
 *
 * @param pos List of {@link GeoPosition}
 *
 * @return List of {@link Triangle}
 */
private List<Triangle> triangulate(List<GeoPosition> pos) {
    // contains all triangles
    List<Triangle> triangles = new ArrayList<Triangle>(pos.size() - 1);
    // standard epsg code
    int epsg = pos.get(0).getEpsgCode();
    // check if it's already a triangle
    if (pos.size() == 3) {
        triangles.add(new Triangle(pos.get(0), pos.get(1), pos.get(2)));
        return triangles;
    }
    // contains all points from the surface
    List<Point3D> face = new ArrayList<>();
    // convert Point2D to Vertex
    for (int i = 0; i < pos.size(); i++) {
        GeoPosition p = pos.get(i);
        face.add(new Point3D(p.getX(), p.getY(), 0.0));
    }
    // create FaceSet and triangulate
    FaceTriangulation fst = new FaceTriangulation();
    List<List<Point3D>> faces = fst.triangulateFace(face);
    // convert
    for (List<Point3D> f : faces) {
        // create GeoPositions
        GeoPosition p1, p2, p3;
        p1 = new GeoPosition(f.get(0).getX(), f.get(0).getY(), epsg);
        p2 = new GeoPosition(f.get(1).getX(), f.get(1).getY(), epsg);
        p3 = new GeoPosition(f.get(2).getX(), f.get(2).getY(), epsg);
        // add triangle
        triangles.add(new Triangle(p1, p2, p3));
    }
    return triangles;
}