/* ======================================
 * JFreeChart : a free Java chart library
 * ======================================
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 * Project Lead:  David Gilbert (david.gilbert@object-refinery.com);
 *
 * (C) Copyright 2000-2003, by Object Refinery Limited and Contributors.
 *
 * 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., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * ------------------
 * BarRenderer3D.java
 * ------------------
 * (C) Copyright 2001-2003, by Serge V. Grachov and Contributors.
 *
 * Original Author:  Serge V. Grachov;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *                   Tin Luu;
 *                   Milo Simpson;
 *                   Richard Atkinson;
 *                   Rich Unger;
 *                   Christian W. Zuckschwerdt;
 *
 * $Id: BarRenderer3D.java,v 1.13 2003/08/20 12:03:48 mungady Exp $
 *
 * Changes
 * -------
 * 31-Oct-2001 : First version, contributed by Serge V. Grachov (DG);
 * 15-Nov-2001 : Modified to allow for null data values (DG);
 * 13-Dec-2001 : Added tooltips (DG);
 * 16-Jan-2002 : Added fix for single category or single series datasets, pointed out by
 *               Taoufik Romdhane (DG);
 * 24-May-2002 : Incorporated tooltips into chart entities (DG);
 * 11-Jun-2002 : Added check for (permitted) null info object, bug and fix reported by David
 *               Basten.  Also updated Javadocs. (DG);
 * 19-Jun-2002 : Added code to draw labels on bars (TL);
 * 26-Jun-2002 : Added bar clipping to avoid PRExceptions (DG);
 * 05-Aug-2002 : Small modification to drawCategoryItem method to support URLs for HTML image
 *               maps (RA);
 * 06-Aug-2002 : Value labels now use number formatter, thanks to Milo Simpson (DG);
 * 08-Aug-2002 : Applied fixed in bug id 592218 (DG);
 * 20-Sep-2002 : Added fix for categoryPaint by Rich Unger, and fixed errors reported by
 *               Checkstyle (DG);
 * 24-Oct-2002 : Amendments for changes in CategoryDataset interface and CategoryToolTipGenerator
 *               interface (DG);
 * 05-Nov-2002 : Replaced references to CategoryDataset with TableDataset (DG);
 * 06-Nov-2002 : Moved to the com.jrefinery.chart.renderer package (DG);
 * 28-Jan-2003 : Added an attribute to control the shading of the left and bottom walls in the
 *               plot background (DG);
 * 25-Mar-2003 : Implemented Serializable (DG);
 * 10-Apr-2003 : Removed category paint usage (DG);
 * 13-May-2003 : Renamed VerticalBarRenderer3D --> BarRenderer3D and merged with
 *               HorizontalBarRenderer3D (DG);
 * 30-Jul-2003 : Modified entity constructor (CZ);
 * 19-Aug-2003 : Implemented Cloneable and PublicCloneable (DG);
 * 
 */

package org.jfree.chart.renderer;

import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Composite;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Paint;
import java.awt.Stroke;
import java.awt.geom.Area;
import java.awt.geom.GeneralPath;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

import org.jfree.chart.Effect3D;
import org.jfree.chart.Marker;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.CategoryItemEntity;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.labels.CategoryItemLabelGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.Plot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.CategoryDataset;
import org.jfree.data.Range;
import org.jfree.io.SerialUtilities;
import org.jfree.ui.RectangleEdge;
import org.jfree.util.PublicCloneable;

/**
 * A renderer for bars with a 3D effect.
 * <p>
 * For use with the {@link org.jfree.chart.plot.CategoryPlot} class.
 *
 * @author Serge V. Grachov
 */
public class BarRenderer3D extends BarRenderer 
                           implements Effect3D, Cloneable, PublicCloneable, Serializable {

    /** The default x-offset for the 3D effect. */
    public static final double DEFAULT_X_OFFSET = 12.0;

    /** The default y-offset for the 3D effect. */
    public static final double DEFAULT_Y_OFFSET = 8.0;

    /** The default wall paint. */
    public static final Paint DEFAULT_WALL_PAINT = new Color(0xDD, 0xDD, 0xDD);

    /** The size of x-offset for the 3D effect. */
    private double xOffset;

    /** The size of y-offset for the 3D effect. */
    private double yOffset;

    /** The paint used to shade the left and lower 3D wall. */
    private transient Paint wallPaint;

    /** Area for clipping hidden areas. */
    private transient Area hiddenClip = null;

    /**
     * Default constructor, creates a renderer with a ten pixel '3D effect'.
     */
    public BarRenderer3D() {
        this(DEFAULT_X_OFFSET, DEFAULT_Y_OFFSET);
    }

    /**
     * Constructs a new renderer with the specified '3D effect'.
     *
     * @param xOffset  the x-offset for the 3D effect.
     * @param yOffset  the y-offset for the 3D effect.
     */
    public BarRenderer3D(double xOffset, double yOffset) {

        super();
        this.xOffset = xOffset;
        this.yOffset = yOffset;
        this.wallPaint = DEFAULT_WALL_PAINT;

    }

    /**
     * Returns the x-offset for the 3D effect.
     *
     * @return the 3D effect.
     */
    public double getXOffset() {
        return this.xOffset;
    }

    /**
     * Returns the y-offset for the 3D effect.
     *
     * @return the 3D effect.
     */
    public double getYOffset() {
        return this.yOffset;
    }

    /**
     * Returns the paint used to highlight the left and bottom wall in the plot background.
     *
     * @return The paint.
     */
    public Paint getWallPaint() {
        return this.wallPaint;
    }

    /**
     * Sets the paint used to hightlight the left and bottom walls in the plot background.
     *
     * @param paint  the paint.
     */
    public void setWallPaint(Paint paint) {
        this.wallPaint = paint;
    }

    /**
     * Draws the background for the plot.
     *
     * @param g2  the graphics device.
     * @param plot  the plot.
     * @param dataArea  the area inside the axes.
     */
    public void drawBackground(Graphics2D g2, CategoryPlot plot, Rectangle2D dataArea) {

        float x0 = (float) dataArea.getX();
        float x1 = x0 + (float) Math.abs(this.xOffset);
        float x3 = (float) dataArea.getMaxX();
        float x2 = x3 - (float) Math.abs(this.xOffset);

        float y0 = (float) dataArea.getMaxY();
        float y1 = y0 - (float) Math.abs(this.yOffset);
        float y3 = (float) dataArea.getMinY();
        float y2 = y3 + (float) Math.abs(this.yOffset);

        GeneralPath clip = new GeneralPath();
        clip.moveTo(x0, y0);
        clip.lineTo(x0, y2);
        clip.lineTo(x1, y3);
        clip.lineTo(x3, y3);
        clip.lineTo(x3, y1);
        clip.lineTo(x2, y0);
        clip.closePath();

        // fill background...
        Paint backgroundPaint = plot.getBackgroundPaint();
        if (backgroundPaint != null) {
            g2.setPaint(backgroundPaint);
            g2.fill(clip);
        }

        GeneralPath leftWall = new GeneralPath();
        leftWall.moveTo(x0, y0);
        leftWall.lineTo(x0, y2);
        leftWall.lineTo(x1, y3);
        leftWall.lineTo(x1, y1);
        leftWall.closePath();
        g2.setPaint(getWallPaint());
        g2.fill(leftWall);

        GeneralPath bottomWall = new GeneralPath();
        bottomWall.moveTo(x0, y0);
        bottomWall.lineTo(x1, y1);
        bottomWall.lineTo(x3, y1);
        bottomWall.lineTo(x2, y0);
        bottomWall.closePath();
        g2.setPaint(getWallPaint());
        g2.fill(bottomWall);

        // higlight the background corners...
        g2.setPaint(Color.lightGray);
        Line2D corner = new Line2D.Double(x0, y0, x1, y1);
        g2.draw(corner);
        corner.setLine(x1, y1, x1, y3);
        g2.draw(corner);
        corner.setLine(x1, y1, x3, y1);
        g2.draw(corner);

        // draw background image, if there is one...
        Image backgroundImage = plot.getBackgroundImage();
        if (backgroundImage != null) {
            Composite originalComposite = g2.getComposite();
            g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC,
                                                       plot.getBackgroundAlpha()));
            g2.drawImage(backgroundImage,
                         (int) x1, (int) y3,
                         (int) (x3 - x1 + 1), (int) (y1 - y3 + 1),
                         null);
            g2.setComposite(originalComposite);
        }

    }

    /**
     * Draws the outline for the plot.
     *
     * @param g2  the graphics device.
     * @param plot  the plot.
     * @param dataArea  the area inside the axes.
     */
    public void drawOutline(Graphics2D g2, CategoryPlot plot, Rectangle2D dataArea) {

        float x0 = (float) dataArea.getX();
        float x1 = x0 + (float) Math.abs(this.xOffset);
        float x3 = (float) dataArea.getMaxX();
        float x2 = x3 - (float) Math.abs(this.xOffset);

        float y0 = (float) dataArea.getMaxY();
        float y1 = y0 - (float) Math.abs(this.yOffset);
        float y3 = (float) dataArea.getMinY();
        float y2 = y3 + (float) Math.abs(this.yOffset);

        GeneralPath clip = new GeneralPath();
        clip.moveTo(x0, y0);
        clip.lineTo(x0, y2);
        clip.lineTo(x1, y3);
        clip.lineTo(x3, y3);