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JFreeChart is a class library, written in Java, for generating charts. Utilising the Java2D API, it supports a wide range of chart types including bar charts, pie charts, line charts, XY-plots, time series plots, Sankey charts and more.
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/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2011, 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.
 *
 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
 * Other names may be trademarks of their respective owners.]
 *
 * -----------------
 * VectorSeries.java
 * -----------------
 * (C) Copyright 2007, 2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 30-Jan-2007 : Version 1 (DG);
 * 24-May-2007 : Renamed getDeltaXValue() --> getVectorXValue(), and likewise
 *               for getDeltaYValue() (DG);
 * 25-May-2007 : Added remove(int) and clear() methods, and moved from the
 *               experimental to the main source tree (DG);
 * 27-Nov-2007 : Removed redundant clear() method (DG);
 *
 */

package org.jfree.data.xy;

import org.jfree.data.ComparableObjectItem;
import org.jfree.data.ComparableObjectSeries;
import org.jfree.data.general.SeriesChangeEvent;

/**
 * A list of (x,y, deltaX, deltaY) data items.
 *
 * @since 1.0.6
 *
 * @see VectorSeriesCollection
 */
public class VectorSeries extends ComparableObjectSeries {

    /**
     * Creates a new empty series.
     *
     * @param key  the series key (null not permitted).
     */
    public VectorSeries(Comparable key) {
        this(key, false, true);
    }

    /**
     * Constructs a new series that contains no data.  You can specify
     * whether or not duplicate x-values are allowed for the series.
     *
     * @param key  the series key (null not permitted).
     * @param autoSort  a flag that controls whether or not the items in the
     *                  series are sorted.
     * @param allowDuplicateXValues  a flag that controls whether duplicate
     *                               x-values are allowed.
     */
    public VectorSeries(Comparable key, boolean autoSort,
            boolean allowDuplicateXValues) {
        super(key, autoSort, allowDuplicateXValues);
    }

    /**
     * Adds a data item to the series.
     *
     * @param x  the x-value.
     * @param y  the y-value.
     * @param deltaX  the vector x.
     * @param deltaY  the vector y.
     */
    public void add(double x, double y, double deltaX, double deltaY) {
        super.add(new VectorDataItem(x, y, deltaX, deltaY), true);
    }

    /**
     * Removes the item at the specified index and sends a
     * {@link SeriesChangeEvent} to all registered listeners.
     *
     * @param index  the index.
     *
     * @return The item removed.
     */
    public ComparableObjectItem remove(int index) {
        VectorDataItem result = (VectorDataItem) this.data.remove(index);
        fireSeriesChanged();
        return result;
    }

    /**
     * Returns the x-value for the specified item.
     *
     * @param index  the item index.
     *
     * @return The x-value.
     */
    public double getXValue(int index) {
        VectorDataItem item = (VectorDataItem) this.getDataItem(index);
        return item.getXValue();
    }

    /**
     * Returns the y-value for the specified item.
     *
     * @param index  the item index.
     *
     * @return The y-value.
     */
    public double getYValue(int index) {
        VectorDataItem item = (VectorDataItem) getDataItem(index);
        return item.getYValue();
    }

    /**
     * Returns the x-component of the vector for an item in the series.
     *
     * @param index  the item index.
     *
     * @return The x-component of the vector.
     */
    public double getVectorXValue(int index) {
        VectorDataItem item = (VectorDataItem) getDataItem(index);
        return item.getVectorX();
    }

    /**
     * Returns the y-component of the vector for an item in the series.
     *
     * @param index  the item index.
     *
     * @return The y-component of the vector.
     */
    public double getVectorYValue(int index) {
        VectorDataItem item = (VectorDataItem) getDataItem(index);
        return item.getVectorY();
    }

    /**
     * Returns the data item at the specified index.
     *
     * @param index  the item index.
     *
     * @return The data item.
     */
    public ComparableObjectItem getDataItem(int index) {
        // overridden to make public
        return super.getDataItem(index);
    }

}