Application: gvSIG desktop

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2013 gvSIG Association.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 3

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

 * MA  02110-1301, USA.

 *

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 */

package org.gvsig.app.project.documents.view.toolListeners.snapping.snappers;

import java.awt.geom.PathIterator;

import java.awt.geom.Point2D;

import org.gvsig.fmap.geom.Geometry;

import org.gvsig.fmap.mapcontrol.PrimitivesDrawer;

import org.gvsig.fmap.mapcontrol.tools.snapping.snappers.ISnapperVectorial;

import org.gvsig.fmap.mapcontrol.tools.snapping.snappers.impl.AbstractSnapper;

import org.gvsig.i18n.Messages;

import com.vividsolutions.jts.geom.Coordinate;

import com.vividsolutions.jts.geom.LineSegment;

public class NearestPointSnapper extends AbstractSnapper implements ISnapperVectorial {

        public Point2D getSnapPoint(Point2D point, Geometry geom, double tolerance, Point2D lastPointEntered) {

                Point2D resul = null;

                Coordinate c = new Coordinate(point.getX(), point.getY());

                PathIterator theIterator = geom.getPathIterator(null, geomManager.getFlatness()); //polyLine.getPathIterator(null, flatness);

                double[] theData = new double[6];

                double minDist = tolerance;

                Coordinate from = null, first = null;

                while (!theIterator.isDone()) {

                        //while not done

                        int theType = theIterator.currentSegment(theData);

                        switch (theType) {

                                case PathIterator.SEG_MOVETO:

                                        from = new Coordinate(theData[0], theData[1]);

                                        first = from;

                                        break;

                                case PathIterator.SEG_LINETO:

                                        // System.out.println("SEG_LINETO");

                                        Coordinate to = new Coordinate(theData[0], theData[1]);

                                        LineSegment line = new LineSegment(from, to);

                                        Coordinate closestPoint = line.closestPoint(c);

                                        double dist = c.distance(closestPoint);

                                        if ((dist < minDist)) {

                                                resul = new Point2D.Double(closestPoint.x, closestPoint.y);

                                                minDist = dist;

                                        }

                                        from = to;

                                        break;

                                case PathIterator.SEG_CLOSE:

                                        line = new LineSegment(from, first);

                                        closestPoint = line.closestPoint(c);

                                        dist = c.distance(closestPoint);

                                        if ((dist < minDist)) {

                                                resul = new Point2D.Double(closestPoint.x, closestPoint.y);

                                                minDist = dist;

                                        }

                                        from = first;

                                        break;

                        } //end switch

                        theIterator.next();

                }

                return resul;

        }

        public String getToolTipText() {

                return Messages.getText("Nearest_point");

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.fmap.mapcontrol.tools.snapping.snappers.ISnapper#draw(org.gvsig.fmap.mapcontrol.PrimitivesDrawer, java.awt.geom.Point2D)

         */

        public void draw(PrimitivesDrawer primitivesDrawer, Point2D pPixels) {

                primitivesDrawer.setColor(getColor());

                int half = getSizePixels() / 2;

                int x1 = (int) (pPixels.getX() - half);

                int x2 = (int) (pPixels.getX() + half);

                int y1 = (int) (pPixels.getY() - half);

                int y2 = (int) (pPixels.getY() + half);

                primitivesDrawer.drawLine(x1, y1, x2, y1); // abajo

                primitivesDrawer.drawLine(x1, y2, x2, y2); // arriba

                primitivesDrawer.drawLine(x1, y1, x2, y2); // abajo - arriba

                primitivesDrawer.drawLine(x1, y2, x2, y1); // arriba - abajo

        }

}