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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 2000-2013, 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.]
 *
 * -----------------
 * XYCoordinate.java
 * -----------------
 * (C) Copyright 2007, 2008, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 30-Jan-2007 : Version 1 (DG);
 * 25-May-2007 : Moved from experimental to the main source tree (DG);
 *
 */

package org.jfree.data.xy;

import java.io.Serializable;

/**
 * Represents an (x, y) coordinate.
 *
 * @since 1.0.6
 */
public class XYCoordinate implements Comparable, Serializable {

    /** The x-coordinate. */
    private double x;

    /** The y-coordinate. */
    private double y;

    /**
     * Creates a new coordinate for the point (0.0, 0.0).
     */
    public XYCoordinate() {
        this(0.0, 0.0);
    }

    /**
     * Creates a new coordinate for the point (x, y).
     *
     * @param x  the x-coordinate.
     * @param y  the y-coordinate.
     */
    public XYCoordinate(double x, double y) {
        this.x = x;
        this.y = y;
    }

    /**
     * Returns the x-coordinate.
     *
     * @return The x-coordinate.
     */
    public double getX() {
        return this.x;
    }

    /**
     * Returns the y-coordinate.
     *
     * @return The y-coordinate.
     */
    public double getY() {
        return this.y;
    }

    /**
     * Tests this coordinate for equality with an arbitrary object.
     *
     * @param obj  the object (null permitted).
     *
     * @return A boolean.
     */
    @Override
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof XYCoordinate)) {
            return false;
        }
        XYCoordinate that = (XYCoordinate) obj;
        if (this.x != that.x) {
            return false;
        }
        if (this.y != that.y) {
            return false;
        }
        return true;
    }

    /**
     * Returns a hash code for this instance.
     *
     * @return A hash code.
     */
    @Override
    public int hashCode() {
        int result = 193;
        long temp = Double.doubleToLongBits(this.x);
        result = 37 * result + (int) (temp ^ (temp >>> 32));
        temp = Double.doubleToLongBits(this.y);
        result = 37 * result + (int) (temp ^ (temp >>> 32));
        return result;
    }

    /**
     * Returns a string representation of this instance, primarily for
     * debugging purposes.
     *
     * @return A string.
     */
    @Override
    public String toString() {
        return "(" + this.x + ", " + this.y + ")";
    }

    /**
     * Compares this instance against an arbitrary object.
     *
     * @param obj  the object (null not permitted).
     *
     * @return An integer indicating the relative order of the items.
     */
    @Override
    public int compareTo(Object obj) {
        if (!(obj instanceof XYCoordinate)) {
            throw new IllegalArgumentException("Incomparable object.");
        }
        XYCoordinate that = (XYCoordinate) obj;
        if (this.x > that.x) {
            return 1;
        }
        else if (this.x < that.x) {
            return -1;
        }
        else {
            if (this.y > that.y) {
                return 1;
            }
            else if (this.y < that.y) {
                return -1;
            }
        }
        return 0;
    }

}