/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2005, 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.  
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 *
 * ---------------------------
 * MinMaxCategoryRenderer.java
 * ---------------------------
 * (C) Copyright 2002-2005, by Object Refinery Limited.
 *
 * Original Author:  Tomer Peretz;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *                   Christian W. Zuckschwerdt;
 *                   Nicolas Brodu (for Astrium and EADS Corporate Research 
 *                   Center);
 *
 * $Id: MinMaxCategoryRenderer.java,v 1.6.2.5 2005/12/02 10:05:57 mungady Exp $
 *
 * Changes:
 * --------
 * 29-May-2002 : Version 1 (TP);
 * 02-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 * 24-Oct-2002 : Amendments for changes in CategoryDataset interface and 
 *               CategoryToolTipGenerator interface (DG);
 * 05-Nov-2002 : Base dataset is now TableDataset not CategoryDataset (DG);
 * 17-Jan-2003 : Moved plot classes to a separate package (DG);
 * 10-Apr-2003 : Changed CategoryDataset to KeyedValues2DDataset in drawItem() 
 *               method (DG);
 * 30-Jul-2003 : Modified entity constructor (CZ);
 * 08-Sep-2003 : Implemented Serializable (NB);
 * 29-Oct-2003 : Added workaround for font alignment in PDF output (DG);
 * 05-Nov-2004 : Modified drawItem() signature (DG);
 * 17-Nov-2005 : Added change events and argument checks (DG);
 * 
 */

package org.jfree.chart.renderer.category;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.AffineTransform;
import java.awt.geom.Arc2D;
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 javax.swing.Icon;

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.event.RendererChangeEvent;
import org.jfree.chart.labels.CategoryToolTipGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.data.category.CategoryDataset;
import org.jfree.io.SerialUtilities;

/**
 * Renderer for drawing min max plot. This renderer draws all the series under 
 * the same category in the same x position using <code>objectIcon</code> and 
 * a line from the maximum value to the minimum value.
 * <p>
 * For use with the {@link org.jfree.chart.plot.CategoryPlot} class.
 *
 * @author Tomer Peretz
 */
public class MinMaxCategoryRenderer extends AbstractCategoryItemRenderer {

    /** For serialization. */
    private static final long serialVersionUID = 2935615937671064911L;
    
    /** A flag indicating whether or not lines are drawn between XY points. */
    private boolean plotLines = false;

    /** 
     * The paint of the line between the minimum value and the maximum value.
     */
    private transient Paint groupPaint = Color.black;

    /** 
     * The stroke of the line between the minimum value and the maximum value.
     */
    private transient Stroke groupStroke = new BasicStroke(1.0f);

    /** The icon used to indicate the minimum value.*/
    private transient Icon minIcon = getIcon(new Arc2D.Double(-4, -4, 8, 8, 0,
            360, Arc2D.OPEN), null, Color.black);

    /** The icon used to indicate the maximum value.*/
    private transient Icon maxIcon = getIcon(new Arc2D.Double(-4, -4, 8, 8, 0,
            360, Arc2D.OPEN), null, Color.black);

    /** The icon used to indicate the values.*/
    private transient Icon objectIcon = getIcon(new Line2D.Double(-4, 0, 4, 0),
            false, true);

    /** The last category. */
    private int lastCategory = -1;

    /** The minimum. */
    private double min;

    /** The maximum. */
    private double max;

    /**
     * Default constructor.
     */
    public MinMaxCategoryRenderer() {
        super();
    }

    /**
     * Gets whether or not lines are drawn between category points.
     *
     * @return boolean true if line will be drawn between sequenced categories,
     *         otherwise false.
     *         
     * @see #setDrawLines(boolean)
     */
    public boolean isDrawLines() {
        return this.plotLines;
    }

    /**
     * Sets the flag that controls whether or not lines are drawn to connect
     * the items within a series and sends a {@link RendererChangeEvent} to 
     * all registered listeners.
     *
     * @param draw  the new value of the flag.
     * 
     * @see #isDrawLines()
     */
    public void setDrawLines(boolean draw) {
        if (this.plotLines != draw) {
            this.plotLines = draw;
            this.notifyListeners(new RendererChangeEvent(this));
        }
        
    }

    /**
     * Returns the paint used to draw the line between the minimum and maximum
     * value items in each category.
     *
     * @return The paint (never <code>null</code>).
     * 
     * @see #setGroupPaint(Paint)
     */
    public Paint getGroupPaint() {
        return this.groupPaint;
    }

    /**
     * Sets the paint used to draw the line between the minimum and maximum
     * value items in each category and sends a {@link RendererChangeEvent} to
     * all registered listeners.
     *
     * @param paint  the paint (<code>null</code> not permitted).
     * 
     * @see #getGroupPaint()
     */
    public void setGroupPaint(Paint paint) {
        if (paint == null) {
            throw new IllegalArgumentException("Null 'paint' argument.");
        }
        this.groupPaint = paint;
        notifyListeners(new RendererChangeEvent(this));
    }

    /**
     * Returns the stroke used to draw the line between the minimum and maximum
     * value items in each category.
     *
     * @return The stroke (never <code>null</code>).
     * 
     * @see #setGroupStroke(Stroke)
     */
    public Stroke getGroupStroke() {
        return this.groupStroke;
    }

    /**
     * Sets the stroke of the line between the minimum value and the maximum 
     * value.
     *
     * @param groupStroke The new stroke
     */
    public void setGroupStroke(Stroke groupStroke) {
        this.groupStroke = groupStroke;
    }

    /**
     * Returns the icon drawn for each data item.
     *
     * @return The icon (never <code>null</code>).
     * 
     * @see #setObjectIcon(Icon)
     */
    public Icon getObjectIcon() {
        return this.objectIcon;
    }

    /**
     * Sets the icon drawn for each data item.
     *
     * @param icon  the icon.
     * 
     * @see #getObjectIcon()
     */
    public void setObjectIcon(Icon icon) {
        if (icon == null) {
            throw new IllegalArgumentException("Null 'icon' argument.");
        }
        this.objectIcon = icon;
        notifyListeners(new RendererChangeEvent(this));
    }

    /**
     * Returns the icon displayed for the maximum value data item within each
     * category.
     *
     * @return The icon (never <code>null</code>).
     * 
     * @see #setMaxIcon(Icon)
     */
    public Icon getMaxIcon() {
        return this.maxIcon;