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.fmap.mapcontrol.tools.Behavior;

import java.awt.AlphaComposite;

import java.awt.event.MouseEvent;

import java.awt.geom.Point2D;

import java.awt.image.BufferedImage;

import org.gvsig.fmap.mapcontrol.MapControlDrawer;

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

import org.gvsig.fmap.mapcontrol.tools.Events.MoveEvent;

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

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

/**

 * <p>

 * Behavior that permits user to move the image of the associated

 * <code>MapControl</code> using a {@link PanListener PanListener}.

 * </p>

 *

 * @author Vicente Caballero Navarro

 * @author Pablo Piqueras Bartolom?

 */

public class MoveBehavior extends Behavior {

    /**

     * First point of the path in image coordinates.

     */

    protected Point2D m_FirstPoint;

    /**

     * Last point of the path in image coordinates.

     */

    protected Point2D m_LastPoint;

    /**

     * Tool listener used to work with the <code>MapControl</code> object.

     *

     * @see #getListener()

     * @see #setListener(ToolListener)

     */

    private PanListener listener;

    private boolean isMyButton;

    /**

     * <p>

     * Creates a new behavior for moving the mouse.

     * </p>

     *

     * @param pli

     *            listener used to permit this object to work with the

     *            associated <code>MapControl</code>

     */

    public MoveBehavior(PanListener pli, int mouseButton) {

        super(mouseButton);

        listener = pli;

    }

    public MoveBehavior(PanListener pli) {

        this(pli,LEFT);

    }

    public void paintComponent(MapControlDrawer renderer) {

        BufferedImage image = getMapControl().getImage();

        if (image != null) {

            if ((m_FirstPoint != null) && (m_LastPoint != null)) {

                renderer.setComposite(AlphaComposite.getInstance(

                    AlphaComposite.SRC_OVER, 0.5f));

                renderer.drawImage(image,

                    (int) (m_LastPoint.getX() - m_FirstPoint.getX()),

                    (int) (m_LastPoint.getY() - m_FirstPoint.getY()));

            }

        }

    }

    public void mousePressed(MouseEvent e) {

        if (isMyButton(e)) {

            isMyButton = true;

            m_FirstPoint = e.getPoint();

        }

        if (listener.cancelDrawing()) {

            getMapControl().cancelDrawing();

        }

    }

    public void mouseReleased(MouseEvent e) throws BehaviorException {

        if (isMyButton(e) && m_FirstPoint != null) {

            doMouseReleased(e);

        }

    }

    protected void doMouseReleased(MouseEvent e) throws BehaviorException {

        MoveEvent event = new MoveEvent(m_FirstPoint, e.getPoint(), e);

        listener.move(event);

        getMapControl().drawMap(true);

        m_FirstPoint = null;

        isMyButton = false;

    }

    public void mouseDragged(MouseEvent e) {

        if (isMyButton) {

            m_LastPoint = e.getPoint();

            getMapControl().repaint();

        }

    }

    /**

     * <p>

     * Sets a tool listener to work with the <code>MapControl</code> using this

     * behavior.

     * </p>

     *

     * @param listener

     *            a <code>PanListener</code> object for this behavior

     */

    public void setListener(ToolListener listener) {

        this.listener = (PanListener) listener;

    }

    public ToolListener getListener() {

        return listener;

    }

}