SnapToVertexEditPointProvider.java

/* Spatial Operations & Editing Tools for uDig
 * 
 * Axios Engineering under a funding contract with: 
 *      Diputación Foral de Gipuzkoa, Ordenación Territorial 
 *
 *      http://b5m.gipuzkoa.net
 *      http://www.axios.es 
 *
 * (C) 2006, Diputación Foral de Gipuzkoa, Ordenación Territorial (DFG-OT). 
 * DFG-OT agrees to licence under Lesser General Public License (LGPL).
 * 
 * You can redistribute it and/or modify it under the terms of the 
 * GNU Lesser General Public License as published by the Free Software 
 * Foundation; version 2.1 of the License.
 *
 * This library 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
 * Lesser General Public License for more details.
 */
package es.axios.udig.ui.editingtools.internal.behaviour;

import net.refractions.udig.project.ui.render.displayAdapter.MapMouseEvent;
import net.refractions.udig.tools.edit.EditState;
import net.refractions.udig.tools.edit.EditToolHandler;
import net.refractions.udig.tools.edit.preferences.PreferenceUtil;
import net.refractions.udig.tools.edit.support.EditBlackboard;
import net.refractions.udig.tools.edit.support.EditUtils;
import net.refractions.udig.tools.edit.support.Point;
import net.refractions.udig.tools.edit.support.SnapBehaviour;

import com.vividsolutions.jts.geom.Coordinate;

/**
 * Provider that returns a point taking in count the snap behaviour configured as a preference.
 * 
 * @author Gabriel Roldan (www.axios.es)
 * @author Mauricio Pazos (www.axios.es)
 * @since 0.2.0
 */
public class SnapToVertexEditPointProvider implements IEditPointProvider {

    private Coordinate performSnapCalculation( EditToolHandler handler, Point point ) {
        EditBlackboard board = handler.getEditBlackboard(handler.getEditLayer());
        SnapBehaviour snapBehaviour = PreferenceUtil.instance().getSnapBehaviour();

        EditUtils editUtils = EditUtils.instance;
        EditState currentState = handler.getCurrentState();

        Coordinate snapCoord;
        snapCoord = editUtils.getClosestSnapPoint(handler, board, point, false, snapBehaviour,
                                                  currentState);
        if (snapCoord != null) {
            return snapCoord;
        }
        return board.toCoord(point);
    }

    public Coordinate getCoordinate( MapMouseEvent e, EditToolHandler handler ) {
        Point point = Point.valueOf(e.x, e.y);
        Coordinate snapCoord = performSnapCalculation(handler, point);
        return snapCoord;
    }

    public Point getPoint( MapMouseEvent e, EditToolHandler handler ) {
        Coordinate coordinate = getCoordinate(e, handler);
        EditBlackboard board = handler.getEditBlackboard(handler.getEditLayer());
        return board.toPoint(coordinate);
    }
}