/*

  *    Geotoolkit.org - An Open Source Java GIS Toolkit

  *    http://www.geotoolkit.org

  *

  *    (C) 2001-2012, Open Source Geospatial Foundation (OSGeo)

  *    (C) 2009-2012, Geomatys

  *

  *    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;

  *    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 org.geotoolkit.gui.swing.event;

 import java.util.EventObject;

 import java.awt.geom.AffineTransform;

 /**

  * An event which indicates that a zoom occurred in a component.

  * This event is fired by {@link org.geotoolkit.gui.swing.ZoomPane}.

  *

  * @author Martin Desruisseaux (IRD)

  * @version 3.00

  *

  * @since 2.0

  * @module

  */

 public class ZoomChangeEvent extends EventObject {

     /**

      * For cross-version compatibility.

      */

     private static final long serialVersionUID = 5063317286699888858L;

     /**

      * An affine transform indicating the zoom change. If {@code oldZoom} and {@code newZoom}

      * are the affine transforms before and after the change respectively, then the following

      * relation must hold (within the limits of rounding error):

      *

      * {@preformat java

      *     newZoom = oldZoom.concatenate(change)

      * }

      */

     private final AffineTransform change;

     /**

      * Constructs a new event. If {@code oldZoom} and {@code newZoom} are the affine transforms

      * before and after the change respectively, then the following relation must hold (within

      * the limits of rounding error):

      *

      * {@preformat java

      *     newZoom = oldZoom.concatenate(change)

      * }

      *

      * @param source The event source (usually a {@link org.geotoolkit.gui.swing.ZoomPane}).

      * @param change An affine transform indicating the zoom change.

      */

     public ZoomChangeEvent(final Object source, final AffineTransform change) {

         super(source);

         this.change = change;

     }

     /**

      * Returns the affine transform indicating the zoom change.

      * <strong>Note:</strong> for performance reasons, this method does not clone

      * the returned transform. Do not change!

      *

      * @return The zoom change as an affine transform (<strong>not</strong> cloned).

      */

     public AffineTransform getChange() {

         return change;

     }

 }