/* ===========================================================
 * 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.]
 *
 * -----------
 * Marker.java
 * -----------
 * (C) Copyright 2002-2005, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Nicolas Brodu;
 *
 * $Id: Marker.java,v 1.10.2.3 2005/10/25 20:52:08 mungady Exp $
 *
 * Changes (since 2-Jul-2002)
 * --------------------------
 * 02-Jul-2002 : Added extra constructor, standard header and Javadoc 
 *               comments (DG);
 * 20-Aug-2002 : Added the outline stroke attribute (DG);
 * 02-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 * 16-Oct-2002 : Added new constructor (DG);
 * 26-Mar-2003 : Implemented Serializable (DG);
 * 21-May-2003 : Added labels (DG);
 * 11-Sep-2003 : Implemented Cloneable (NB);
 * 05-Nov-2003 : Added checks to ensure some attributes are never null (DG);
 * 11-Feb-2003 : Moved to org.jfree.chart.plot package, plus significant API 
 *               changes to support IntervalMarker in plots (DG);
 * 14-Jun-2004 : Updated equals() method (DG);
 * 21-Jan-2005 : Added settings to control direction of horizontal and 
 *               vertical label offsets (DG);
 * 01-Jun-2005 : Modified to use only one label offset type - this will be 
 *               applied to the domain or range axis as appropriate (DG);
 * 06-Jun-2005 : Fix equals() method to handle GradientPaint (DG);
 * 19-Aug-2005 : Changed constructor from public --> protected (DG);
 *
 */

package org.jfree.chart.plot;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.Paint;
import java.awt.Stroke;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

import org.jfree.io.SerialUtilities;
import org.jfree.ui.LengthAdjustmentType;
import org.jfree.ui.RectangleAnchor;
import org.jfree.ui.RectangleInsets;
import org.jfree.ui.TextAnchor;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PaintUtilities;

/**
 * The base class for markers that can be added to plots to highlight a value 
 * or range of values.
 */
public abstract class Marker implements Cloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -734389651405327166L;

    /** The paint. */
    private transient Paint paint;

    /** The stroke. */
    private transient Stroke stroke;
    
    /** The outline paint. */
    private transient Paint outlinePaint;

    /** The outline stroke. */
    private transient Stroke outlineStroke;

    /** The alpha transparency. */
    private float alpha;

    /** The label. */
    private String label = null;

    /** The label font. */
    private Font labelFont;

    /** The label paint. */
    private transient Paint labelPaint;

    /** The label position. */
    private RectangleAnchor labelAnchor;
    
    /** The text anchor for the label. */
    private TextAnchor labelTextAnchor;

    /** The label offset from the marker rectangle. */
    private RectangleInsets labelOffset;
    
    /** 
     * The offset type for the domain or range axis (never <code>null</code>). 
     */
    private LengthAdjustmentType labelOffsetType;
    
    /**
     * Creates a new marker with default attributes.
     */
    protected Marker() {
        this(Color.gray);
    }

    /**
     * Constructs a new marker.
     *
     * @param paint  the paint (<code>null</code> not permitted).
     */
    protected Marker(Paint paint) {
        this(
            paint, new BasicStroke(0.5f), Color.gray, 
            new BasicStroke(0.5f), 0.80f
        );
    }

    /**
     * Constructs a new marker.
     *
     * @param paint  the paint (<code>null</code> not permitted).
     * @param stroke  the stroke (<code>null</code> not permitted).
     * @param outlinePaint  the outline paint (<code>null</code> permitted).
     * @param outlineStroke  the outline stroke (<code>null</code> permitted).
     * @param alpha  the alpha transparency.
     */
    protected Marker(Paint paint, Stroke stroke, 
                     Paint outlinePaint, Stroke outlineStroke, 
                     float alpha) {

        if (paint == null) {
            throw new IllegalArgumentException("Null 'paint' argument.");
        }
        if (stroke == null) {
            throw new IllegalArgumentException("Null 'stroke' argument.");
        }
        
        this.paint = paint;
        this.stroke = stroke;
        this.outlinePaint = outlinePaint;
        this.outlineStroke = outlineStroke;
        this.alpha = alpha;
        
        this.labelFont = new Font("SansSerif", Font.PLAIN, 9);
        this.labelPaint = Color.black;
        this.labelAnchor = RectangleAnchor.TOP_LEFT;
        this.labelOffset = new RectangleInsets(3.0, 3.0, 3.0, 3.0);
        this.labelOffsetType = LengthAdjustmentType.CONTRACT;
        this.labelTextAnchor = TextAnchor.CENTER;
        
    }

    /**
     * Returns the paint.
     *
     * @return The paint (never <code>null</code>).
     */
    public Paint getPaint() {
        return this.paint;
    }
    
    /**
     * Sets the paint.
     * 
     * @param paint  the paint (<code>null</code> not permitted).
     */
    public void setPaint(Paint paint) {
        if (paint == null) {
            throw new IllegalArgumentException("Null 'paint' argument.");
        }
        this.paint = paint;
    }

    /**
     * Returns the stroke.
     *
     * @return The stroke (never <code>null</code>).
     */
    public Stroke getStroke() {
        return this.stroke;
    }
    
    /**
     * Sets the stroke.
     * 
     * @param stroke  the stroke (<code>null</code> not permitted).
     */
    public void setStroke(Stroke stroke) {
        if (stroke == null) {
            throw new IllegalArgumentException("Null 'stroke' argument.");
        }
        this.stroke = stroke;
    }

    /**
     * Returns the outline paint.
     *
     * @return The outline paint (possibly <code>null</code>).
     */
    public Paint getOutlinePaint() {
        return this.outlinePaint;
    }
    
    /**
     * Sets the outline paint.
     * 
     * @param paint  the paint (<code>null</code> permitted).
     */
    public void setOutlinePaint(Paint paint) {
        this.outlinePaint = paint;
    }

    /**
     * Returns the outline stroke.
     *
     * @return The outline stroke (possibly <code>null</code>).
     */
    public Stroke getOutlineStroke() {
        return this.outlineStroke;
    }
    
    /**
     * Sets the outline stroke.
     * 
     * @param stroke  the stroke (<code>null</code> permitted).
     */
    public void setOutlineStroke(Stroke stroke) {
        this.outlineStroke = stroke;
    }

    /**
     * Returns the alpha transparency.
     *