org.kalypso.ogc.gml.widgets.base.PanToWidget.java Source code

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Here is the source code for org.kalypso.ogc.gml.widgets.base.PanToWidget.java

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/*--------------- Kalypso-Header --------------------------------------------------------------------
    
 This file is part of kalypso.
 Copyright (C) 2004, 2005 by:
    
 Technical University Hamburg-Harburg (TUHH)
 Institute of River and coastal engineering
 Denickestr. 22
 21073 Hamburg, Germany
 http://www.tuhh.de/wb
    
 and
    
 Bjoernsen Consulting Engineers (BCE)
 Maria Trost 3
 56070 Koblenz, Germany
 http://www.bjoernsen.de
    
 This library is free software; 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; either
 version 2.1 of the License, or (at your option) any later version.
    
 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.
    
 You should have received a copy of the GNU Lesser General Public
 License along with this library; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    
 Contact:
    
 E-Mail:
 belger@bjoernsen.de
 schlienger@bjoernsen.de
 v.doemming@tuhh.de
    
 ---------------------------------------------------------------------------------------------------*/
package org.kalypso.ogc.gml.widgets.base;

import java.awt.Point;
import java.awt.event.MouseEvent;

import org.apache.commons.lang3.ArrayUtils;
import org.kalypso.ogc.gml.command.ChangeExtentCommand;
import org.kalypso.ogc.gml.map.IMapPanel;
import org.kalypso.ogc.gml.widgets.AbstractWidget;
import org.kalypsodeegree.graphics.transformation.GeoTransform;
import org.kalypsodeegree.model.geometry.GM_Envelope;
import org.kalypsodeegree.model.geometry.GM_Position;
import org.kalypsodeegree_impl.model.geometry.GeometryFactory;

/**
 * @author Andreas von Dmming
 */
public class PanToWidget extends AbstractWidget {
    private GeoTransform m_world2screen = null;

    private GM_Position m_startPoint = null;

    private GM_Position m_endPoint = null;

    private final int[] m_mouseButtons;

    public PanToWidget(final String name, final String toolTip) {
        super(name, toolTip);

        m_mouseButtons = new int[] { MouseEvent.BUTTON1, MouseEvent.BUTTON2 };
    }

    public PanToWidget() {
        super("pan to", ""); //$NON-NLS-1$ //$NON-NLS-2$
        m_mouseButtons = new int[] { MouseEvent.BUTTON1, MouseEvent.BUTTON2 };
    }

    public PanToWidget(final int[] mouseButtons) {
        super("pan to", ""); //$NON-NLS-1$ //$NON-NLS-2$
        m_mouseButtons = mouseButtons;
    }

    @Override
    public void mouseDragged(final MouseEvent e) {
        final IMapPanel mapPanel = getMapPanel();
        if (mapPanel == null)
            return;

        final Point point = e.getPoint();

        if (m_world2screen != null && m_startPoint != null) {
            final GM_Position pixelPos = GeometryFactory.createGM_Position(point.getX(), point.getY());
            m_endPoint = m_world2screen.getSourcePoint(pixelPos);

            final GM_Envelope panExtent = calcPanExtent();
            mapPanel.setBoundingBox(panExtent, false, false);
        }
    }

    private GM_Envelope calcPanExtent() {
        final double[] vector = new double[] { m_startPoint.getX() - m_endPoint.getX(),
                m_startPoint.getY() - m_endPoint.getY() };

        final GM_Envelope startExtent = m_world2screen.getSourceRect();

        final GM_Position panMin = GeometryFactory.createGM_Position(startExtent.getMinX(), startExtent.getMinY());
        final GM_Position panMax = GeometryFactory.createGM_Position(startExtent.getMaxX(), startExtent.getMaxY());

        panMin.translate(vector);
        panMax.translate(vector);

        return GeometryFactory.createGM_Envelope(panMin, panMax, startExtent.getCoordinateSystem());
    }

    @Override
    public void finish() {
    }

    @Override
    public void mousePressed(final MouseEvent e) {
        if (!ArrayUtils.contains(m_mouseButtons, e.getButton()))
            return;

        final IMapPanel mapPanel = getMapPanel();
        if (mapPanel == null)
            return;

        final Point point = e.getPoint();

        m_world2screen = mapPanel.getProjection();
        if (m_world2screen == null)
            return;

        final GM_Position pixelPos = GeometryFactory.createGM_Position(point.getX(), point.getY());
        m_startPoint = m_world2screen.getSourcePoint(pixelPos);

        m_endPoint = null;
    }

    @Override
    public void mouseReleased(final MouseEvent e) {
        if (!ArrayUtils.contains(m_mouseButtons, e.getButton()))
            return;

        if (m_world2screen == null)
            return;

        final Point point = e.getPoint();

        final GM_Position pixelPos = GeometryFactory.createGM_Position(point.getX(), point.getY());
        m_endPoint = m_world2screen.getSourcePoint(pixelPos);

        perform();
    }

    public void perform() {
        final IMapPanel mapPanel = getMapPanel();

        if (m_world2screen != null && m_startPoint != null && m_endPoint != null
                && !m_startPoint.equals(m_endPoint)) {
            final GM_Envelope panExtent = calcPanExtent();

            m_startPoint = null;
            m_world2screen = null;
            m_endPoint = null;

            final ChangeExtentCommand command = new ChangeExtentCommand(mapPanel, panExtent);
            postViewCommand(command, null);
        }
    }

    @Override
    public WIDGET_TYPE getType() {
        return WIDGET_TYPE.eRadio;
    }
}