/* =========================================================== * JFreeChart : a free chart library for the Java(tm) platform * =========================================================== * * (C) Copyright 2000-2012, 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); }