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jfreechart example source code file (AbstractPieLabelDistributor.java)

This example jfreechart source code file (AbstractPieLabelDistributor.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

abstractpielabeldistributor, abstractpielabeldistributor, illegalargumentexception, io, list, null, null, pielabelrecord, pielabelrecord, serializable, serializable, util

The jfreechart AbstractPieLabelDistributor.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.]
 *
 * --------------------------------
 * AbstractPieLabelDistributor.java
 * --------------------------------
 * (C) Copyright 2007, 2008, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 14-Jun-2007 : Version 1 (DG);
 *
 */

package org.jfree.chart.plot;

import java.io.Serializable;
import java.util.List;

/**
 * A base class for handling the distribution of pie section labels.  Create
 * your own subclass and set it using the
 * {@link PiePlot#setLabelDistributor(AbstractPieLabelDistributor)} method
 * if you want to customise the label distribution.
 */
public abstract class AbstractPieLabelDistributor implements Serializable {

    /** The label records. */
    protected List labels;

    /**
     * Creates a new instance.
     */
    public AbstractPieLabelDistributor() {
        this.labels = new java.util.ArrayList();
    }

    /**
     * Returns a label record from the list.
     *
     * @param index  the index.
     *
     * @return The label record.
     */
    public PieLabelRecord getPieLabelRecord(int index) {
        return (PieLabelRecord) this.labels.get(index);
    }

    /**
     * Adds a label record.
     *
     * @param record  the label record (<code>null not permitted).
     */
    public void addPieLabelRecord(PieLabelRecord record) {
        if (record == null) {
            throw new IllegalArgumentException("Null 'record' argument.");
        }
        this.labels.add(record);
    }

    /**
     * Returns the number of items in the list.
     *
     * @return The item count.
     */
    public int getItemCount() {
        return this.labels.size();
    }

    /**
     * Clears the list of labels.
     */
    public void clear() {
        this.labels.clear();
    }

    /**
     * Called by the {@link PiePlot} class.  Implementations should distribute
     * the labels in this.labels then return.
     *
     * @param minY  the y-coordinate for the top of the label area.
     * @param height  the height of the label area.
     */
    public abstract void distributeLabels(double minY, double height);

}

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