    001    /* ===========================================================
    002     * JFreeChart : a free chart library for the Java(tm) platform
    003     * ===========================================================
    004     *
    005     * (C) Copyright 2000-2007, by Object Refinery Limited and Contributors.
    006     *
    007     * Project Info:  http://www.jfree.org/jfreechart/index.html
    008     *
    009     * This library is free software; you can redistribute it and/or modify it
    010     * under the terms of the GNU Lesser General Public License as published by
    011     * the Free Software Foundation; either version 2.1 of the License, or
    012     * (at your option) any later version.
    013     *
    014     * This library is distributed in the hope that it will be useful, but
    015     * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    016     * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
    017     * License for more details.
    018     *
    019     * You should have received a copy of the GNU Lesser General Public
    020     * License along with this library; if not, write to the Free Software
    021     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
    022     * USA.
    023     *
    024     * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
    025     * in the United States and other countries.]
    026     *
    027     * ----------
    028     * Block.java
    029     * ----------
    030     * (C) Copyright 2004-2007, by Object Refinery Limited.
    031     *
    032     * Original Author:  David Gilbert (for Object Refinery Limited);
    033     * Contributor(s):   -;
    034     *
    035     * Changes:
    036     * --------
    037     * 22-Oct-2004 : Version 1 (DG);
    038     * 08-Feb-2005 : Added ID (DG);
    039     * 20-Apr-2005 : Added a new draw() method that can accept params
    040     *               and return results (DG);
    041     *
    042     */
    043
    044    package org.jfree.chart.block;
    045
    046    import java.awt.Graphics2D;
    047    import java.awt.geom.Rectangle2D;
    048
    049    import org.jfree.ui.Drawable;
    050    import org.jfree.ui.Size2D;
    051
    052    /**
    053     * A block is an arbitrary item that can be drawn (in Java2D space) within a
    054     * rectangular area, has a preferred size, and can be arranged by an
    055     * {@link Arrangement} manager.
    056     */
    057    public interface Block extends Drawable {
    058
    059        /**
    060         * Returns an ID for the block.
    061         *
    062         * @return An ID.
    063         */
    064        public String getID();
    065
    066        /**
    067         * Sets the ID for the block.
    068         *
    069         * @param id  the ID.
    070         */
    071        public void setID(String id);
    072
    073        /**
    074         * Arranges the contents of the block, with no constraints, and returns
    075         * the block size.
    076         *
    077         * @param g2  the graphics device.
    078         *
    079         * @return The size of the block.
    080         */
    081        public Size2D arrange(Graphics2D g2);
    082
    083        /**
    084         * Arranges the contents of the block, within the given constraints, and
    085         * returns the block size.
    086         *
    087         * @param g2  the graphics device.
    088         * @param constraint  the constraint (<code>null</code> not permitted).
    089         *
    090         * @return The block size (in Java2D units, never <code>null</code>).
    091         */
    092        public Size2D arrange(Graphics2D g2, RectangleConstraint constraint);
    093
    094        /**
    095         * Returns the current bounds of the block.
    096         *
    097         * @return The bounds.
    098         */
    099        public Rectangle2D getBounds();
    100
    101        /**
    102         * Sets the bounds of the block.
    103         *
    104         * @param bounds  the bounds.
    105         */
    106        public void setBounds(Rectangle2D bounds);
    107
    108        /**
    109         * Draws the block within the specified area.  Refer to the documentation
    110         * for the implementing class for information about the <code>params</code>
    111         * and return value supported.
    112         *
    113         * @param g2  the graphics device.
    114         * @param area  the area.
    115         * @param params  optional parameters (<code>null</code> permitted).
    116         *
    117         * @return An optional return value (possibly <code>null</code>).
    118         */
    119        public Object draw(Graphics2D g2, Rectangle2D area, Object params);
    120
    121    }