001/* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-present, by David Gilbert and Contributors.
006 *
007 * Project Info:  http://www.jfree.org/jfreechart/index.html
008 *
009 * This library is free software; you can redistribute it and/or modify it
010 * under the terms of the GNU Lesser General Public License as published by
011 * the Free Software Foundation; either version 2.1 of the License, or
012 * (at your option) any later version.
013 *
014 * This library is distributed in the hope that it will be useful, but
015 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
016 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
017 * License for more details.
018 *
019 * You should have received a copy of the GNU Lesser General Public
020 * License along with this library; if not, write to the Free Software
021 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
022 * USA.
023 *
024 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
025 * Other names may be trademarks of their respective owners.]
026 *
027 * ---------------
028 * WindNeedle.java
029 * ---------------
030 * (C) Copyright 2002-present, by the Australian Antarctic Division and
031 *                          Contributors.
032 *
033 * Original Author:  Bryan Scott (for the Australian Antarctic Division);
034 * Contributor(s):   David Gilbert;
035 *
036 */
037
038package org.jfree.chart.needle;
039
040import java.awt.Graphics2D;
041import java.awt.geom.Point2D;
042import java.awt.geom.Rectangle2D;
043import java.io.Serializable;
044
045/**
046 * A needle that indicates wind direction, for use with the
047 * {@link org.jfree.chart.plot.CompassPlot} class.
048 */
049public class WindNeedle extends ArrowNeedle implements Cloneable, Serializable {
050
051    /** For serialization. */
052    private static final long serialVersionUID = -2861061368907167834L;
053
054    /**
055     * Default constructor.
056     */
057    public WindNeedle() {
058        super(false);  // isArrowAtTop
059    }
060
061    /**
062     * Draws the needle.
063     *
064     * @param g2  the graphics device.
065     * @param plotArea  the plot area.
066     * @param rotate  the rotation point.
067     * @param angle  the angle.
068     */
069    @Override
070    protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea,
071            Point2D rotate, double angle) {
072
073        super.drawNeedle(g2, plotArea, rotate, angle);
074        if ((rotate != null) && (plotArea != null)) {
075
076            int spacing = getSize() * 3;
077            Rectangle2D newArea = new Rectangle2D.Double();
078
079            Point2D newRotate = rotate;
080            newArea.setRect(plotArea.getMinX() - spacing, plotArea.getMinY(),
081                    plotArea.getWidth(), plotArea.getHeight());
082            super.drawNeedle(g2, newArea, newRotate, angle);
083
084            newArea.setRect(plotArea.getMinX() + spacing,
085                    plotArea.getMinY(), plotArea.getWidth(),
086                    plotArea.getHeight());
087            super.drawNeedle(g2, newArea, newRotate, angle);
088
089        }
090    }
091
092    /**
093     * Tests another object for equality with this object.
094     *
095     * @param object  the object to test.
096     *
097     * @return A boolean.
098     */
099    @Override
100    public boolean equals(Object object) {
101        if (object == null) {
102            return false;
103        }
104        if (object == this) {
105            return true;
106        }
107        if (super.equals(object) && object instanceof WindNeedle) {
108            return true;
109        }
110        return false;
111    }
112
113    /**
114     * Returns a hash code for this instance.
115     *
116     * @return A hash code.
117     */
118    @Override
119    public int hashCode() {
120        return super.hashCode();
121    }
122
123}
124