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jfreechart example source code file (TextAnnotation.java)

This example jfreechart source code file (TextAnnotation.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - jfreechart tags/keywords

awt, default_paint, default_rotation_anchor, default_rotation_angle, font, illegalargumentexception, illegalargumentexception, io, null, null, paint, string, textanchor, textanchor, textannotation, textannotation

The jfreechart TextAnnotation.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2008, 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.]
 *
 * -------------------
 * TextAnnotation.java
 * -------------------
 * (C) Copyright 2002-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes:
 * --------
 * 28-Aug-2002 : Version 1 (DG);
 * 07-Nov-2002 : Fixed errors reported by Checkstyle, added accessor
 *               methods (DG);
 * 13-Jan-2003 : Reviewed Javadocs (DG);
 * 26-Mar-2003 : Implemented Serializable (DG);
 * 02-Jun-2003 : Added anchor and rotation settings (DG);
 * 19-Aug-2003 : Added equals() method and implemented Cloneable (DG);
 * 29-Sep-2004 : Updated equals() method (DG);
 * 06-Jun-2005 : Fixed equals() method to work with GradientPaint (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 16-Jan-2007 : Added argument checks, fixed hashCode() method and updated
 *               API docs (DG);
 *
 */

package org.jfree.chart.annotations;

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

import org.jfree.chart.HashUtilities;
import org.jfree.io.SerialUtilities;
import org.jfree.ui.TextAnchor;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PaintUtilities;

/**
 * A base class for text annotations.  This class records the content but not
 * the location of the annotation.
 */
public class TextAnnotation implements Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 7008912287533127432L;

    /** The default font. */
    public static final Font DEFAULT_FONT
            = new Font("SansSerif", Font.PLAIN, 10);

    /** The default paint. */
    public static final Paint DEFAULT_PAINT = Color.black;

    /** The default text anchor. */
    public static final TextAnchor DEFAULT_TEXT_ANCHOR = TextAnchor.CENTER;

    /** The default rotation anchor. */
    public static final TextAnchor DEFAULT_ROTATION_ANCHOR = TextAnchor.CENTER;

    /** The default rotation angle. */
    public static final double DEFAULT_ROTATION_ANGLE = 0.0;

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

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

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

    /** The text anchor. */
    private TextAnchor textAnchor;

    /** The rotation anchor. */
    private TextAnchor rotationAnchor;

    /** The rotation angle. */
    private double rotationAngle;

    /**
     * Creates a text annotation with default settings.
     *
     * @param text  the text (<code>null not permitted).
     */
    protected TextAnnotation(String text) {
        if (text == null) {
            throw new IllegalArgumentException("Null 'text' argument.");
        }
        this.text = text;
        this.font = DEFAULT_FONT;
        this.paint = DEFAULT_PAINT;
        this.textAnchor = DEFAULT_TEXT_ANCHOR;
        this.rotationAnchor = DEFAULT_ROTATION_ANCHOR;
        this.rotationAngle = DEFAULT_ROTATION_ANGLE;
    }

    /**
     * Returns the text for the annotation.
     *
     * @return The text (never <code>null).
     *
     * @see #setText(String)
     */
    public String getText() {
        return this.text;
    }

    /**
     * Sets the text for the annotation.
     *
     * @param text  the text (<code>null not permitted).
     *
     * @see #getText()
     */
    public void setText(String text) {
        if (text == null) {
            throw new IllegalArgumentException("Null 'text' argument.");
        }
        this.text = text;
    }

    /**
     * Returns the font for the annotation.
     *
     * @return The font (never <code>null).
     *
     * @see #setFont(Font)
     */
    public Font getFont() {
        return this.font;
    }

    /**
     * Sets the font for the annotation.
     *
     * @param font  the font (<code>null not permitted).
     *
     * @see #getFont()
     */
    public void setFont(Font font) {
        if (font == null) {
            throw new IllegalArgumentException("Null 'font' argument.");
        }
        this.font = font;
    }

    /**
     * Returns the paint for the annotation.
     *
     * @return The paint (never <code>null).
     *
     * @see #setPaint(Paint)
     */
    public Paint getPaint() {
        return this.paint;
    }

    /**
     * Sets the paint for the annotation.
     *
     * @param paint  the paint (<code>null not permitted).
     *
     * @see #getPaint()
     */
    public void setPaint(Paint paint) {
        if (paint == null) {
            throw new IllegalArgumentException("Null 'paint' argument.");
        }
        this.paint = paint;
    }

    /**
     * Returns the text anchor.
     *
     * @return The text anchor.
     *
     * @see #setTextAnchor(TextAnchor)
     */
    public TextAnchor getTextAnchor() {
        return this.textAnchor;
    }

    /**
     * Sets the text anchor (the point on the text bounding rectangle that is
     * aligned to the (x, y) coordinate of the annotation).
     *
     * @param anchor  the anchor point (<code>null not permitted).
     *
     * @see #getTextAnchor()
     */
    public void setTextAnchor(TextAnchor anchor) {
        if (anchor == null) {
            throw new IllegalArgumentException("Null 'anchor' argument.");
        }
        this.textAnchor = anchor;
    }

    /**
     * Returns the rotation anchor.
     *
     * @return The rotation anchor point (never <code>null).
     *
     * @see #setRotationAnchor(TextAnchor)
     */
    public TextAnchor getRotationAnchor() {
        return this.rotationAnchor;
    }

    /**
     * Sets the rotation anchor point.
     *
     * @param anchor  the anchor (<code>null not permitted).
     *
     * @see #getRotationAnchor()
     */
    public void setRotationAnchor(TextAnchor anchor) {
        this.rotationAnchor = anchor;
    }

    /**
     * Returns the rotation angle in radians.
     *
     * @return The rotation angle.
     *
     * @see #setRotationAngle(double)
     */
    public double getRotationAngle() {
        return this.rotationAngle;
    }

    /**
     * Sets the rotation angle.  The angle is measured clockwise in radians.
     *
     * @param angle  the angle (in radians).
     *
     * @see #getRotationAngle()
     */
    public void setRotationAngle(double angle) {
        this.rotationAngle = angle;
    }

    /**
     * Tests this object for equality with an arbitrary object.
     *
     * @param obj  the object (<code>null permitted).
     *
     * @return <code>true or false.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        // now try to reject equality...
        if (!(obj instanceof TextAnnotation)) {
            return false;
        }
        TextAnnotation that = (TextAnnotation) obj;
        if (!ObjectUtilities.equal(this.text, that.getText())) {
            return false;
        }
        if (!ObjectUtilities.equal(this.font, that.getFont())) {
            return false;
        }
        if (!PaintUtilities.equal(this.paint, that.getPaint())) {
            return false;
        }
        if (!ObjectUtilities.equal(this.textAnchor, that.getTextAnchor())) {
            return false;
        }
        if (!ObjectUtilities.equal(this.rotationAnchor,
                that.getRotationAnchor())) {
            return false;
        }
        if (this.rotationAngle != that.getRotationAngle()) {
            return false;
        }

        // seem to be the same...
        return true;

    }

    /**
     * Returns a hash code for this instance.
     *
     * @return A hash code.
     */
    public int hashCode() {
        int result = 193;
        result = 37 * result + this.font.hashCode();
        result = 37 * result + HashUtilities.hashCodeForPaint(this.paint);
        result = 37 * result + this.rotationAnchor.hashCode();
        long temp = Double.doubleToLongBits(this.rotationAngle);
        result = 37 * result + (int) (temp ^ (temp >>> 32));
        result = 37 * result + this.text.hashCode();
        result = 37 * result + this.textAnchor.hashCode();
        return result;
    }

    /**
     * Provides serialization support.
     *
     * @param stream  the output stream.
     *
     * @throws IOException if there is an I/O error.
     */
    private void writeObject(ObjectOutputStream stream) throws IOException {
        stream.defaultWriteObject();
        SerialUtilities.writePaint(this.paint, stream);
    }

    /**
     * Provides serialization support.
     *
     * @param stream  the input stream.
     *
     * @throws IOException  if there is an I/O error.
     * @throws ClassNotFoundException  if there is a classpath problem.
     */
    private void readObject(ObjectInputStream stream)
        throws IOException, ClassNotFoundException {
        stream.defaultReadObject();
        this.paint = SerialUtilities.readPaint(stream);
    }

}

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