texttitle.java

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/* ======================================
 * JFreeChart : a free Java chart library
 * ======================================
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 * Project Lead:  David Gilbert ([e-mail]);
 *
 * (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.
 *
 * --------------
 * TextTitle.java
 * --------------
 * (C) Copyright 2000-2003, by David Berry and Contributors.
 *
 * Original Author:  David Berry;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * $Id: TextTitle.java,v 1.7 2003/07/16 13:43:31 mungady Exp $
 *
 * Changes (from 18-Sep-2001)
 * --------------------------
 * 18-Sep-2001 : Added standard header (DG);
 * 07-Nov-2001 : Separated the JCommon Class Library classes, JFreeChart now requires
 *               jcommon.jar (DG);
 * 09-Jan-2002 : Updated Javadoc comments (DG);
 * 07-Feb-2002 : Changed Insets --> Spacer in AbstractTitle.java (DG);
 * 06-Mar-2002 : Updated import statements (DG);
 * 25-Jun-2002 : Removed redundant imports (DG);
 * 18-Sep-2002 : Fixed errors reported by Checkstyle (DG);
 * 28-Oct-2002 : Small modifications while changing JFreeChart class (DG);
 * 13-Mar-2003 : Changed width used for relative spacing to fix bug 703050 (DG);
 * 26-Mar-2003 : Implemented Serializable (DG);
 * 15-Jul-2003 : Fixed null pointer exception (DG);
 *
 */

package org.jfree.chart;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.font.FontRenderContext;
import java.awt.font.LineMetrics;
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.event.TitleChangeEvent;
import org.jfree.io.SerialUtilities;
import org.jfree.util.ObjectUtils;

/**
 * A standard chart title.
 *
 * @author David Gilbert
 */
public class TextTitle extends AbstractTitle implements Serializable {

    /** The default font. */
    public static final Font DEFAULT_FONT = new Font("SansSerif", Font.BOLD, 12);

    /** The default text color. */
    public static final Paint DEFAULT_TEXT_PAINT = Color.black;

    /** The title text. */
    private String text;

    /** The font used to display the title. */
    private Font font;

    /** The paint used to display the title text. */
    private transient Paint paint;

    /** The background paint. */
    private transient Paint backgroundPaint;
    
    /**
     * Creates a new title, using default attributes where necessary.
     *
     * @param text  the title text.
     */
    public TextTitle(String text) {

        this(text,
             TextTitle.DEFAULT_FONT,
             TextTitle.DEFAULT_TEXT_PAINT,
             AbstractTitle.DEFAULT_POSITION,
             AbstractTitle.DEFAULT_HORIZONTAL_ALIGNMENT,
             AbstractTitle.DEFAULT_VERTICAL_ALIGNMENT,
             AbstractTitle.DEFAULT_SPACER);

    }

    /**
     * Creates a new title, using default attributes where necessary.
     *
     * @param text  the title text.
     * @param font  the title font.
     */
    public TextTitle(String text, Font font) {

        this(text, font,
             TextTitle.DEFAULT_TEXT_PAINT,
             AbstractTitle.DEFAULT_POSITION,
             AbstractTitle.DEFAULT_HORIZONTAL_ALIGNMENT,
             AbstractTitle.DEFAULT_VERTICAL_ALIGNMENT,
             AbstractTitle.DEFAULT_SPACER);

    }

    /**
     * Creates a new title, using default attributes where necessary.
     *
     * @param text  the title text.
     * @param font  the title font.
     * @param paint  the title color.
     */
    public TextTitle(String text, Font font, Paint paint) {

        this(text, font, paint,
             AbstractTitle.DEFAULT_POSITION,
             AbstractTitle.DEFAULT_HORIZONTAL_ALIGNMENT,
             AbstractTitle.DEFAULT_VERTICAL_ALIGNMENT,
             AbstractTitle.DEFAULT_SPACER);

    }
    /**
     * Creates a new title, using default attributes where necessary.
     * <P>
     * For the horizontal alignment, use the constants (LEFT, RIGHT and CENTER) defined in the
     * AbstractTitle class.
     *
     * @param text  the title text.
     * @param font  the title font.
     * @param horizontalAlignment  the horizontal alignment.
     */
    public TextTitle(String text, Font font, int horizontalAlignment) {

        this(text, font,
             TextTitle.DEFAULT_TEXT_PAINT,
             AbstractTitle.DEFAULT_POSITION,
             horizontalAlignment,
             AbstractTitle.DEFAULT_VERTICAL_ALIGNMENT,
             AbstractTitle.DEFAULT_SPACER);

    }

    /**
     * Constructs a TextTitle with the specified properties.
     * <p>
     * For the titlePosition, horizontalAlignment and verticalAlignment, use the constants
     * defined in the AbstractTitle class.
     *
     * @param text  the text for the title.
     * @param font  the title font.
     * @param paint  the title color.
     * @param position  the title position.
     * @param horizontalAlignment  the horizontal alignment.
     * @param verticalAlignment  the vertical alignment.
     * @param spacer  the space to leave around the outside of the title.
     */
    public TextTitle(String text, Font font, Paint paint, int position,
                     int horizontalAlignment, int verticalAlignment,
                     Spacer spacer) {

        super(position, horizontalAlignment, verticalAlignment, spacer);
        this.text = text;
        this.font = font;
        this.paint = paint;
        this.backgroundPaint = null;
        
    }

    /**
     * Returns the title text.
     *
     * @return the text.
     */
    public String getText() {
        return text;
    }

    /**
     * Sets the title to the specified text. This method notifies registered
     * listeners that the title has been modified.
     *
     * @param text  the new text.
     */
    public void setText(String text) {

        if (!this.text.equals(text)) {
            this.text = text;
            notifyListeners(new TitleChangeEvent(this));
        }

    }

    /**
     * Returns the font used to display the title string.
     *
     * @return the font.
     */
    public Font getFont() {
        return this.font;
    }

    /**
     * Sets the font used to display the title string.  Registered listeners are notified that
     * the title has been modified.
     *
     * @param font  the new font (null not permitted).
     */
    public void setFont(Font font) {

        // check argument...
        if (font == null) {
            throw new IllegalArgumentException("TextTitle.setFont(...): null font not permitted.");
        }

        // make the change...
        if (!this.font.equals(font)) {
            this.font = font;
            notifyListeners(new TitleChangeEvent(this));
        }

    }

    /**
     * Returns the paint used to display the title string.
     *
     * @return the paint.
     */
    public Paint getPaint() {
        return this.paint;
    }

    /**
     * Sets the paint used to display the title string.  Registered listeners are notified that
     * the title has been modified.
     *
     * @param paint  the new paint (null not permitted).
     */
    public void setPaint(Paint paint) {

        // check argument...