Application: gvSIG desktop

import com.vividsolutions.jts.algorithm.HCoordinate;

import com.vividsolutions.jts.geom.LineSegment;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.gvsig.fmap.geom.GeometryException;

    public static final Logger logger = LoggerFactory.getLogger(JTSUtils.class);

     * @throws GeometryException

        LinearRing[] holes = new LinearRing[interiorRings.size()];

        for(int i=0; i<interiorRings.size(); i++){

            Ring ring = interiorRings.get(i);

            holes[i] = (LinearRing) ((GeometryJTS) ring).getJTS();

        return factory.createPolygon(shell, holes);

    /**

     * Returns the intersection point between an ellipse and her minor axis.

     *

     * @param init

     * @param middle

     * @param end

     * @return

     */

    public static Coordinate getPointAtYAxisInEllipse(Point init, Point end, Double ydist) {

        LineSegment segment = new LineSegment(((PointJTS) init).getJTSCoordinate(),

            ((PointJTS) end).getJTSCoordinate());

        Coordinate middle = segment.midPoint();

        LineSegment midSegment = new LineSegment(middle, ((PointJTS) end).getJTSCoordinate());

        double modulus = midSegment.getLength();

        //Mayor axis unitary vector

        Coordinate uni = new Coordinate(middle.x+((end.getX()-middle.x)/modulus), middle.y+((end.getY()-middle.y)/modulus));

        //Minor axis unitary vector

        Coordinate perpUni = new Coordinate(-uni.y,uni.x);

        Coordinate point = new Coordinate(middle.x+(perpUni.x*ydist), middle.y+(perpUni.y*ydist));

        return point;

    }

    /**

     * Returns the middle point between two points.

     *

     * @param init

     * @param middle

     * @param end

     * @return

     */

    public static Coordinate getMidPoint(Point init, Point end) {

        LineSegment segment = new LineSegment(((PointJTS) init).getJTSCoordinate(),

            ((PointJTS) end).getJTSCoordinate());

        Coordinate middle = segment.midPoint();

        return middle;

    }