Application: gvSIG desktop » gvSIG tools: Vector editing

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright ? 2007-2015 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 2

 * 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.vectorediting.lib.prov.extendline.operation;

import org.gvsig.fmap.dal.exception.DataException;

import org.gvsig.fmap.dal.feature.FeatureSelection;

import org.gvsig.fmap.geom.GeometryLocator;

import org.gvsig.fmap.geom.GeometryManager;

import org.gvsig.fmap.geom.exception.CreateGeometryException;

import org.gvsig.fmap.geom.operation.GeometryOperationException;

import org.gvsig.fmap.geom.operation.GeometryOperationNotSupportedException;

import org.gvsig.fmap.geom.primitive.Curve;

import org.gvsig.fmap.geom.primitive.Point;

/**

 * @author llmarques

 *

 */

public class CurveExtendLineOperation implements ExtendLineOperation {

    public Curve extendLine(Curve lineToExtend, Point insertedPoint,

        FeatureSelection boundaryObjects)

        throws GeometryOperationNotSupportedException,

        GeometryOperationException, DataException, CreateGeometryException {

        GeometryManager geoManager = GeometryLocator.getGeometryManager();

        int subtype = lineToExtend.getGeometryType().getSubType();

        Curve extendedLine = geoManager.createLine(subtype);

        Point startVertex = lineToExtend.getVertex(0);

        Point endVertex =

            lineToExtend.getVertex(lineToExtend.getNumVertices() - 1);

        Point startIntersectionPoint = null;

        Point endIntersectionPoint = null;

        if (insertedPoint.distance(startVertex) < insertedPoint

            .distance(endVertex)) {

            startIntersectionPoint =

                ExtendLineOperationUtils.curveIntersection(lineToExtend,

                    ExtendLineOperationUtils.START_SIDE, boundaryObjects);

        } else {

            endIntersectionPoint =

                ExtendLineOperationUtils.curveIntersection(lineToExtend,

                    ExtendLineOperationUtils.END_SIDE, boundaryObjects);

        }

        if (startIntersectionPoint != null) {

            extendedLine.addVertex(startIntersectionPoint);

        }

        for (int i = 0; i < lineToExtend.getNumVertices(); i++) {

            extendedLine.addVertex(lineToExtend.getVertex(i));

        }

        if (endIntersectionPoint != null) {

            extendedLine.addVertex(endIntersectionPoint);

        }

        return extendedLine;

    }

}