# WindNeedle.java

    /* ===========================================================
     * JFreeChart : a free chart library for the Java(tm) platform
     * ===========================================================
     *
     * (C) Copyright 2000-2007, 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.]
     *
     * ---------------
     * WindNeedle.java
     * ---------------
     * (C) Copyright 2002-2007, by the Australian Antarctic Division and
     *                          Contributors.
     *
     * Original Author:  Bryan Scott (for the Australian Antarctic Division);
     * Contributor(s):   David Gilbert (for Object Refinery Limited);
     *
     * Changes:
     * --------
     * 25-Sep-2002 : Version 1, contributed by Bryan Scott (DG);
     * 09-Sep-2003 : Added equals() method (DG);
     * 22-Nov-2007 : Implemented hashCode() (DG)
     *
     */

    package org.jfree.chart.needle;

    import java.awt.Graphics2D;
    import java.awt.geom.Point2D;
    import java.awt.geom.Rectangle2D;
    import java.io.Serializable;

    /**
     * A needle that indicates wind direction, for use with the
     * {@link org.jfree.chart.plot.CompassPlot} class.
     */
    public class WindNeedle extends ArrowNeedle
                                    implements Cloneable, Serializable {

        /** For serialization. */
        private static final long serialVersionUID = -2861061368907167834L;

        /**
         * Default constructor.
         */
        public WindNeedle() {
            super(false);  // isArrowAtTop
        }

        /**
         * Draws the needle.
         *
         * @param g2  the graphics device.
         * @param plotArea  the plot area.
         * @param rotate  the rotation point.
         * @param angle  the angle.
         */
        protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea,
                                  Point2D rotate, double angle) {

            super.drawNeedle(g2, plotArea, rotate, angle);
            if ((rotate != null) && (plotArea != null)) {

                int spacing = getSize() * 3;
                Rectangle2D newArea = new Rectangle2D.Double();

                Point2D newRotate = rotate;
                newArea.setRect(plotArea.getMinX() - spacing, plotArea.getMinY(),
                        plotArea.getWidth(), plotArea.getHeight());
                super.drawNeedle(g2, newArea, newRotate, angle);

                newArea.setRect(plotArea.getMinX() + spacing,
                        plotArea.getMinY(), plotArea.getWidth(),
                        plotArea.getHeight());
                super.drawNeedle(g2, newArea, newRotate, angle);

            }
        }

        /**
         * Tests another object for equality with this object.
         *
         * @param object  the object to test.
         *
         * @return A boolean.
         */
        public boolean equals(Object object) {
            if (object == null) {
                return false;
            }
            if (object == this) {
                return true;
            }
            if (super.equals(object) && object instanceof WindNeedle) {
                return true;
            }
            return false;
        }

        /**
         * Returns a hash code for this instance.
         *
         * @return A hash code.
         */
        public int hashCode() {
            return super.hashCode();
        }

    }