/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2011, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jfreechart/index.html
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
* Other names may be trademarks of their respective owners.]
*
* ------------
* Overlay.java
* ------------
* (C) Copyright 2009, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* Changes:
* --------
* 09-Apr-2009 : Version 1 (DG);
*
*/
package org.jfree.chart.panel;
import java.awt.Graphics2D;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.event.OverlayChangeListener;
/**
* Defines the interface for an overlay that can be added to a
* {@link ChartPanel}.
*
* @since 1.0.13
*/
public interface Overlay {
/**
* Paints the crosshairs in the layer.
*
* @param g2 the graphics target.
* @param chartPanel the chart panel.
*/
public void paintOverlay(Graphics2D g2, ChartPanel chartPanel);
/**
* Registers a change listener with the overlay.
*
* @param listener the listener.
*/
public void addChangeListener(OverlayChangeListener listener);
/**
* Deregisters a listener from the overlay.
*
* @param listener the listener.
*/
public void removeChangeListener(OverlayChangeListener listener);
}
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