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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.]
 *
 * -------------------
 * VectorDataItem.java
 * -------------------
 * (C) Copyright 2007-2009, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 30-Jan-2007 : Version 1 (DG);
 * 24-May-2007 : Added getVector(), renamed getDeltaX() --> getVectorX(),
 *               and likewise for getDeltaY() (DG);
 * 25-May-2007 : Moved from experimental to the main source tree (DG);
 *
 */

package org.jfree.data.xy;

import org.jfree.data.ComparableObjectItem;

/**
 * A data item representing data in the form (x, y, deltaX, deltaY), intended
 * for use by the {@link VectorSeries} class.
 *
 * @since 1.0.6
 */
public class VectorDataItem extends ComparableObjectItem {

    /**
     * Creates a new instance of VectorDataItem.
     *
     * @param x  the x-value.
     * @param y  the y-value.
     * @param deltaX  the vector x.
     * @param deltaY  the vector y.
     */
    public VectorDataItem(double x, double y, double deltaX, double deltaY) {
        super(new XYCoordinate(x, y), new Vector(deltaX, deltaY));
    }

    /**
     * Returns the x-value.
     *
     * @return The x-value (never null).
     */
    public double getXValue() {
        XYCoordinate xy = (XYCoordinate) getComparable();
        return xy.getX();
    }

    /**
     * Returns the y-value.
     *
     * @return The y-value.
     */
    public double getYValue() {
        XYCoordinate xy = (XYCoordinate) getComparable();
        return xy.getY();
    }

    /**
     * Returns the vector.
     *
     * @return The vector (possibly null).
     */
    public Vector getVector() {
        return (Vector) getObject();
    }

    /**
     * Returns the x-component for the vector.
     *
     * @return The x-component.
     */
    public double getVectorX() {
        Vector vi = (Vector) getObject();
        if (vi != null) {
            return vi.getX();
        }
        else {
            return Double.NaN;
        }
    }

    /**
     * Returns the y-component for the vector.
     *
     * @return The y-component.
     */
    public double getVectorY() {
        Vector vi = (Vector) getObject();
        if (vi != null) {
            return vi.getY();
        }
        else {
            return Double.NaN;
        }
    }

}