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JFreeChart is a class library, written in Java, for generating charts. Utilising the Java2D APIs, it currently supports bar charts, pie charts, line charts, XY-plots and time series plots.

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/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2013, 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.]
 *
 * ----------------
 * Arrangement.java
 * ----------------
 * (C) Copyright 2004-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes:
 * --------
 * 22-Oct-2004 : Version 1 (DG);
 * 11-Feb-2005 : Modified arrange() method to return Size2D (DG);
 * 22-Apr-2005 : Reordered arguments in arrange() method (DG);
 *
 */

package org.jfree.chart.block;

import java.awt.Graphics2D;

import org.jfree.ui.Size2D;

/**
 * An object that is responsible for arranging a collection of {@link Block}s
 * within a {@link BlockContainer}.
 */
public interface Arrangement {

    /**
     * Adds a block and a key which can be used to determine the position of
     * the block in the arrangement.  This method is called by the container
     * (you don't need to call this method directly) and gives the arrangement
     * an opportunity to record the details if they are required.
     *
     * @param block  the block.
     * @param key  the key (null permitted).
     */
    public void add(Block block, Object key);

    /**
     * Arranges the blocks within the specified container, subject to the given
     * constraint.
     *
     * @param container  the container (null not permitted).
     * @param g2  the graphics device.
     * @param constraint  the constraint.
     *
     * @return The container size after the arrangement.
     */
    public Size2D arrange(BlockContainer container,
                          Graphics2D g2,
                          RectangleConstraint constraint);

    /**
     * Clears any cached layout information retained by the arrangement.
     */
    public void clear();

}