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jfreechart example source code file (ItemLabelPosition.java)

This example jfreechart source code file (ItemLabelPosition.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

illegalargumentexception, illegalargumentexception, io, itemlabelanchor, itemlabelposition, itemlabelposition, null, null, serializable, textanchor, textanchor

The jfreechart ItemLabelPosition.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.]
 *
 * ----------------------
 * ItemLabelPosition.java
 * ----------------------
 * (C) Copyright 2003-2008, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 27-Oct-2003 : Version 1 (DG);
 * 19-Feb-2004 : Moved to org.jfree.chart.labels, updated Javadocs and argument
 *               checking (DG);
 * 26-Feb-2004 : Added new constructor (DG);
 *
 */

package org.jfree.chart.labels;

import java.io.Serializable;

import org.jfree.ui.TextAnchor;

/**
 * The attributes that control the position of the label for each data item on
 * a chart.  Instances of this class are immutable.
 */
public class ItemLabelPosition implements Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 5845390630157034499L;

    /** The item label anchor point. */
    private ItemLabelAnchor itemLabelAnchor;

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

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

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

    /**
     * Creates a new position record with default settings.
     */
    public ItemLabelPosition() {
        this(ItemLabelAnchor.OUTSIDE12, TextAnchor.BOTTOM_CENTER,
                TextAnchor.CENTER, 0.0);
    }

    /**
     * Creates a new position record (with zero rotation).
     *
     * @param itemLabelAnchor  the item label anchor (<code>null not
     *                         permitted).
     * @param textAnchor  the text anchor (<code>null not permitted).
     */
    public ItemLabelPosition(ItemLabelAnchor itemLabelAnchor,
                             TextAnchor textAnchor) {
        this(itemLabelAnchor, textAnchor, TextAnchor.CENTER, 0.0);
    }

    /**
     * Creates a new position record.  The item label anchor is a point
     * relative to the data item (dot, bar or other visual item) on a chart.
     * The item label is aligned by aligning the text anchor with the
     * item label anchor.
     *
     * @param itemLabelAnchor  the item label anchor (<code>null not
     *                         permitted).
     * @param textAnchor  the text anchor (<code>null not permitted).
     * @param rotationAnchor  the rotation anchor (<code>null not
     *                        permitted).
     * @param angle  the rotation angle (in radians).
     */
    public ItemLabelPosition(ItemLabelAnchor itemLabelAnchor,
                             TextAnchor textAnchor,
                             TextAnchor rotationAnchor,
                             double angle) {

        if (itemLabelAnchor == null) {
            throw new IllegalArgumentException(
                    "Null 'itemLabelAnchor' argument.");
        }
        if (textAnchor == null) {
            throw new IllegalArgumentException("Null 'textAnchor' argument.");
        }
        if (rotationAnchor == null) {
            throw new IllegalArgumentException(
                    "Null 'rotationAnchor' argument.");
        }

        this.itemLabelAnchor = itemLabelAnchor;
        this.textAnchor = textAnchor;
        this.rotationAnchor = rotationAnchor;
        this.angle = angle;

    }

    /**
     * Returns the item label anchor.
     *
     * @return The item label anchor (never <code>null).
     */
    public ItemLabelAnchor getItemLabelAnchor() {
        return this.itemLabelAnchor;
    }

    /**
     * Returns the text anchor.
     *
     * @return The text anchor (never <code>null).
     */
    public TextAnchor getTextAnchor() {
        return this.textAnchor;
    }

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

    /**
     * Returns the angle of rotation for the label.
     *
     * @return The angle (in radians).
     */
    public double getAngle() {
        return this.angle;
    }

    /**
     * Tests this object for equality with an arbitrary object.
     *
     * @param obj  the object (<code>null permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof ItemLabelPosition)) {
            return false;
        }
        ItemLabelPosition that = (ItemLabelPosition) obj;
        if (!this.itemLabelAnchor.equals(that.itemLabelAnchor)) {
            return false;
        }
        if (!this.textAnchor.equals(that.textAnchor)) {
            return false;
        }
        if (!this.rotationAnchor.equals(that.rotationAnchor)) {
            return false;
        }
        if (this.angle != that.angle) {
            return false;
        }
        return true;
    }

}

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