Application: gvSIG desktop

package com.iver.cit.gvsig.project.documents.view.snapping;

import java.awt.geom.Point2D;

import java.util.ArrayList;

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

import com.vividsolutions.jts.geom.Coordinate;

import com.vividsolutions.jts.geom.Geometry;

import com.vividsolutions.jts.geom.GeometryFactory;

import com.vividsolutions.jts.index.ItemVisitor;

/**

 * SnappingVisitor with geometries.

 *

 * @author Vicente Caballero Navarro

 */

public class GeometriesSnappingVisitor extends SnappingVisitor

    implements ItemVisitor {

    private ArrayList geometries = new ArrayList();

    private GeometryFactory geometryFactory = new GeometryFactory();

    public GeometriesSnappingVisitor(ISnapperVectorial snapper, Point2D point,

        double mapTolerance, Point2D lastPointEntered) {

        super(snapper, point, mapTolerance, lastPointEntered);

    }

    public void visitItem(Object item) {

        try {

                    IGeometry geom = (IGeometry) item;

                Geometry geometry = geom.toJTSGeometry();

                double distance = geometry.distance(geometryFactory.createPoint(

                            new Coordinate(queryPoint.getX(), queryPoint.getY())));

                if (distance < tolerance) {

                    geometries.add(geom);

                }

        }catch (Exception e) {

                }

    }

    public Point2D getSnapPoint() {

        if (geometries.isEmpty()) {

            return null;

        }

        IGeometry[] geoms = (IGeometry[]) geometries.toArray(new IGeometry[0]);

        ((ISnapperGeometriesVectorial) snapper).setGeometries(geoms);

        Point2D result = null;

        for (int i = 0; i < geoms.length; i++) {

            result = snapper.getSnapPoint(queryPoint, geoms[i], tolerance,

                    lastPointEntered);

            if (result != null) {

                return result;

            }

        }

        return result;

    }

}