| gvSIG desktop 1

/* gvSIG. Geographic Information System of the Valencian Government

 *

 * Copyright (C) 2007-2008 Infrastructures and Transports Department

 * of the Valencian Government (CIT)

 *

 * 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.

 *

 */

package org.gvsig.fmap.mapcontrol.tools.Behavior;

import java.awt.event.MouseWheelEvent;

import org.gvsig.fmap.geom.Geometry.SUBTYPES;

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

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

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

import org.gvsig.fmap.mapcontext.ViewPort;

import org.gvsig.fmap.mapcontrol.MapControl;

import org.gvsig.fmap.mapcontrol.MapControlDrawer;

import org.gvsig.fmap.mapcontrol.tools.BehaviorException;

import org.gvsig.fmap.mapcontrol.tools.Listeners.ToolListener;

/**

 * @author gvSIG Team

 * @version $Id$

 *

 */

public class MouseWheelBehavior extends Behavior {

    /**

     * Constructor.

     */

    public MouseWheelBehavior() {

    }

    @Override

    public ToolListener getListener() {

        return null;

    }

    @Override

    public void mouseWheelMoved(MouseWheelEvent event) throws BehaviorException {

        MapControl control = getMapControl();

        control.cancelDrawing();

        super.mouseWheelMoved(event);

        ViewPort viewPort = control.getViewPort();

        Envelope envelope = viewPort.getEnvelope();

        if (envelope != null) {

            double factor = event.getWheelRotation() < 0 ? 0.9d : 1.2d;

            Point mousePosition = viewPort.convertToMapPoint(event.getPoint());

            Point envelopPoint1 = envelope.getLowerCorner();

            Point envelopPoint2 = envelope.getUpperCorner();

            double width1 = mousePosition.getX() - envelopPoint1.getX();

            double heigth1 = mousePosition.getY() - envelopPoint1.getY();

            double width2 = envelopPoint2.getX() - mousePosition.getX();

            double heigth2 = envelopPoint2.getY() - mousePosition.getY();

            double xmin = mousePosition.getX() - width1 * factor;

            double ymin = mousePosition.getY() - heigth1 * factor;

            double xmax = mousePosition.getX() + width2 * factor;

            double ymax = mousePosition.getY() + heigth2 * factor;

            try {

                viewPort.setEnvelope(geomManager.createEnvelope(xmin, ymin,

                    xmax, ymax, SUBTYPES.GEOM2D));

            } catch (CreateEnvelopeException e) {

                throw new BehaviorException(

                    "Error changing the viewport envelope to (" + xmin + ","

                        + ymin + "),(" + xmax + "," + ymax + ")", e);

            }

            getMapControl().drawMap(true);

        }

        event.consume();

    }

    @Override

    public void paintComponent(MapControlDrawer mapControlDrawer) {

            // Do nothing

    }

}