001/* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2013, by Object Refinery Limited 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 2002-2008, by the Australian Antarctic Division and
031 *                          Contributors.
032 *
033 * Original Author:  Bryan Scott (for the Australian Antarctic Division);
034 * Contributor(s):   David Gilbert (for Object Refinery Limited);
035 *
036 * Changes:
037 * --------
038 * 25-Sep-2002 : Version 1, contributed by Bryan Scott (DG);
039 * 09-Sep-2003 : Added equals() method (DG);
040 * 22-Nov-2007 : Implemented hashCode() (DG)
041 *
042 */
043
044package org.jfree.chart.needle;
045
046import java.awt.Graphics2D;
047import java.awt.geom.Point2D;
048import java.awt.geom.Rectangle2D;
049import java.io.Serializable;
050
051/**
052 * A needle that indicates wind direction, for use with the
053 * {@link org.jfree.chart.plot.CompassPlot} class.
054 */
055public class WindNeedle extends ArrowNeedle
056                                implements Cloneable, Serializable {
057
058    /** For serialization. */
059    private static final long serialVersionUID = -2861061368907167834L;
060
061    /**
062     * Default constructor.
063     */
064    public WindNeedle() {
065        super(false);  // isArrowAtTop
066    }
067
068    /**
069     * Draws the needle.
070     *
071     * @param g2  the graphics device.
072     * @param plotArea  the plot area.
073     * @param rotate  the rotation point.
074     * @param angle  the angle.
075     */
076    @Override
077    protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea,
078                              Point2D rotate, double angle) {
079
080        super.drawNeedle(g2, plotArea, rotate, angle);
081        if ((rotate != null) && (plotArea != null)) {
082
083            int spacing = getSize() * 3;
084            Rectangle2D newArea = new Rectangle2D.Double();
085
086            Point2D newRotate = rotate;
087            newArea.setRect(plotArea.getMinX() - spacing, plotArea.getMinY(),
088                    plotArea.getWidth(), plotArea.getHeight());
089            super.drawNeedle(g2, newArea, newRotate, angle);
090
091            newArea.setRect(plotArea.getMinX() + spacing,
092                    plotArea.getMinY(), plotArea.getWidth(),
093                    plotArea.getHeight());
094            super.drawNeedle(g2, newArea, newRotate, angle);
095
096        }
097    }
098
099    /**
100     * Tests another object for equality with this object.
101     *
102     * @param object  the object to test.
103     *
104     * @return A boolean.
105     */
106    @Override
107    public boolean equals(Object object) {
108        if (object == null) {
109            return false;
110        }
111        if (object == this) {
112            return true;
113        }
114        if (super.equals(object) && object instanceof WindNeedle) {
115            return true;
116        }
117        return false;
118    }
119
120    /**
121     * Returns a hash code for this instance.
122     *
123     * @return A hash code.
124     */
125    @Override
126    public int hashCode() {
127        return super.hashCode();
128    }
129
130}
131