Application: gvSIG desktop

package com.iver.cit.gvsig.gui.cad.snapping;

import java.awt.geom.Point2D;

import com.iver.cit.gvsig.fmap.core.IGeometry;

import com.vividsolutions.jts.index.ItemVisitor;

/**

 * @author fjp

 *

 * Visitor adecuado para recorrer el ?ndice espacial de JTS y no obligar

 * a dar 2 pasadas. En la misma pasada que se visita, se calcula la distancia

 * m?nima.

 */

public class SnappingVisitor implements ItemVisitor {

        ISnapper snapper;

        Point2D snapPoint = null;

        Point2D queryPoint = null;

        double minDist = Double.MAX_VALUE;

        double distActual;

        double tolerance;

        public SnappingVisitor(ISnapper snapper, Point2D queryPoint, double tolerance)

        {

                this.snapper = snapper;

                this.tolerance = tolerance;

                this.queryPoint = queryPoint;

                distActual = tolerance;

        }

        public void visitItem(Object item) {

                IGeometry geom = (IGeometry) item;

                Point2D aux  = snapper.getSnapPoint(queryPoint, geom, distActual);

                if (aux != null)

                {

                        snapPoint = aux;

                        minDist = snapPoint.distance(queryPoint);

                        distActual = minDist;

                }

        }

        public Point2D getSnapPoint()

        {

                return snapPoint;

        }

        public double getMinDist() {

                return minDist;

        }

}