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     * PointerNeedle.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: PointerNeedle.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     * 26-Mar-2003 : Implemented Serializable (DG);
042     * 09-Sep-2003 : Added equals() method (DG);
043     * 08-Jun-2005 : Implemented Cloneable (DG);
044     *
045     */
046    
047    package org.jfree.chart.needle;
048    
049    import java.awt.Graphics2D;
050    import java.awt.geom.GeneralPath;
051    import java.awt.geom.Point2D;
052    import java.awt.geom.Rectangle2D;
053    import java.io.Serializable;
054    
055    /**
056     * A needle in the shape of a pointer, for use with the
057     * {@link org.jfree.chart.plot.CompassPlot} class.
058     *
059     * @author Bryan Scott
060     */
061    public class PointerNeedle extends MeterNeedle 
062                               implements Cloneable, Serializable {
063    
064        /** For serialization. */
065        private static final long serialVersionUID = -4744677345334729606L;
066        
067        /**
068         * Draws the needle.
069         *
070         * @param g2  the graphics device.
071         * @param plotArea  the plot area.
072         * @param rotate  the rotation point.
073         * @param angle  the angle.
074         */
075        protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea, 
076                                  Point2D rotate, double angle) {
077    
078            GeneralPath shape1 = new GeneralPath();
079            GeneralPath shape2 = new GeneralPath();
080            float minX = (float) plotArea.getMinX();
081            float minY = (float) plotArea.getMinY();
082            float maxX = (float) plotArea.getMaxX();
083            float maxY = (float) plotArea.getMaxY();
084            float midX = (float) (minX + (plotArea.getWidth() / 2));
085            float midY = (float) (minY + (plotArea.getHeight() / 2));
086    
087            shape1.moveTo(minX, midY);
088            shape1.lineTo(midX, minY);
089            shape1.lineTo(maxX, midY);
090            shape1.closePath();
091    
092            shape2.moveTo(minX, midY);
093            shape2.lineTo(midX, maxY);
094            shape2.lineTo(maxX, midY);
095            shape2.closePath();
096    
097            if ((rotate != null) && (angle != 0)) {
098                /// we have rotation huston, please spin me
099                getTransform().setToRotation(angle, rotate.getX(), rotate.getY());
100                shape1.transform(getTransform());
101                shape2.transform(getTransform());
102            }
103    
104            if (getFillPaint() != null) {
105                g2.setPaint(getFillPaint());
106                g2.fill(shape1);
107            }
108    
109            if (getHighlightPaint() != null) {
110                g2.setPaint(getHighlightPaint());
111                g2.fill(shape2);
112            }
113    
114            if (getOutlinePaint() != null) {
115                g2.setStroke(getOutlineStroke());
116                g2.setPaint(getOutlinePaint());
117                g2.draw(shape1);
118                g2.draw(shape2);
119            }
120        }
121    
122        /**
123         * Tests another object for equality with this object.
124         * 
125         * @param obj  the object to test (<code>null</code> permitted).
126         * 
127         * @return A boolean.
128         */
129        public boolean equals(Object obj) {
130            if (obj == this) {
131                return true;
132            }
133            if (!(obj instanceof PointerNeedle)) {
134                return false;   
135            }
136            if (!super.equals(obj)) {
137                return false;
138            }
139            return true;
140        }
141    
142        /**
143         * Returns a clone of this needle.
144         * 
145         * @return A clone.
146         */
147        public Object clone() throws CloneNotSupportedException {
148            return super.clone();   
149        }
150    
151    }