001    /* ===========================================================
002     * JFreeChart : a free chart library for the Java(tm) platform
003     * ===========================================================
004     *
005     * (C) Copyright 2000-2006, 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     * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
025     * in the United States and other countries.]
026     *
027     * ---------------
028     * WindNeedle.java
029     * ---------------
030     * (C) Copyright 2002-2006, 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     * $Id: WindNeedle.java,v 1.4.2.3 2006/08/02 10:40:57 mungady Exp $
037     *
038     * Changes:
039     * --------
040     * 25-Sep-2002 : Version 1, contributed by Bryan Scott (DG);
041     * 09-Sep-2003 : Added equals() method (DG);
042     *
043     */
044    
045    package org.jfree.chart.needle;
046    
047    import java.awt.Graphics2D;
048    import java.awt.geom.Point2D;
049    import java.awt.geom.Rectangle2D;
050    import java.io.Serializable;
051    
052    /**
053     * A needle that indicates wind direction, for use with the
054     * {@link org.jfree.chart.plot.CompassPlot} class.
055     */
056    public class WindNeedle extends ArrowNeedle 
057                                    implements Cloneable, Serializable {
058    
059        /** For serialization. */
060        private static final long serialVersionUID = -2861061368907167834L;
061        
062        /**
063         * Default constructor.
064         */
065        public WindNeedle() {
066            super(false);  // isArrowAtTop
067        }
068    
069        /**
070         * Draws the needle.
071         *
072         * @param g2  the graphics device.
073         * @param plotArea  the plot area.
074         * @param rotate  the rotation point.
075         * @param angle  the angle.
076         */
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        public boolean equals(Object object) {
107            if (object == null) {
108                return false;
109            }
110            if (object == this) {
111                return true;
112            }
113            if (super.equals(object) && object instanceof WindNeedle) {
114                return true;
115            }
116            return false;
117        }
118    
119    }
120