001    /* ===========================================================
002     * JFreeChart : a free chart library for the Java(tm) platform
003     * ===========================================================
004     *
005     * (C) Copyright 2000-2005, 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 2002-2005, 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 1.4.2.2 2005/10/25 20:50:49 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     * @author Bryan Scott
057     */
058    public class WindNeedle extends ArrowNeedle 
059                                    implements Cloneable, Serializable {
060    
061        /** For serialization. */
062        private static final long serialVersionUID = -2861061368907167834L;
063        
064        /**
065         * Default constructor.
066         */
067        public WindNeedle() {
068            super(false);  // isArrowAtTop
069        }
070    
071        /**
072         * Draws the needle.
073         *
074         * @param g2  the graphics device.
075         * @param plotArea  the plot area.
076         * @param rotate  the rotation point.
077         * @param angle  the angle.
078         */
079        protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea, 
080                                  Point2D rotate, double angle) {
081    
082            super.drawNeedle(g2, plotArea, rotate, angle);
083            if ((rotate != null) && (plotArea != null)) {
084    
085                int spacing = getSize() * 3;
086                Rectangle2D newArea = new Rectangle2D.Double();
087    
088                Point2D newRotate = rotate;
089                newArea.setRect(
090                    plotArea.getMinX() - spacing, plotArea.getMinY(),
091                    plotArea.getWidth(), plotArea.getHeight()
092                );
093                super.drawNeedle(g2, newArea, newRotate, angle);
094    
095                newArea.setRect(
096                    plotArea.getMinX() + spacing, plotArea.getMinY(),
097                    plotArea.getWidth(), plotArea.getHeight()
098                );
099                super.drawNeedle(g2, newArea, newRotate, angle);
100    
101            }
102        }
103    
104        /**
105         * Tests another object for equality with this object.
106         * 
107         * @param object  the object to test.
108         * 
109         * @return A boolean.
110         */
111        public boolean equals(Object object) {
112            if (object == null) {
113                return false;
114            }
115            if (object == this) {
116                return true;
117            }
118            if (super.equals(object) && object instanceof WindNeedle) {
119                return true;
120            }
121            return false;
122        }
123    
124    }
125