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     * PinNeedle.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: MiddlePinNeedle.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     * 27-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.Area;
051    import java.awt.geom.Ellipse2D;
052    import java.awt.geom.GeneralPath;
053    import java.awt.geom.Point2D;
054    import java.awt.geom.Rectangle2D;
055    import java.io.Serializable;
056    
057    /**
058     * A needle that is drawn as a pin shape.
059     */
060    public class MiddlePinNeedle extends MeterNeedle 
061                                 implements Cloneable, Serializable {
062    
063        /** For serialization. */
064        private static final long serialVersionUID = 6237073996403125310L;
065        
066        /**
067         * Draws the needle.
068         *
069         * @param g2  the graphics device.
070         * @param plotArea  the plot area.
071         * @param rotate  the rotation point.
072         * @param angle  the angle.
073         */
074        protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea, 
075                                  Point2D rotate, double angle) {
076    
077            Area shape;
078            GeneralPath pointer = new GeneralPath();
079    
080            int minY = (int) (plotArea.getMinY());
081            //int maxX = (int) (plotArea.getMaxX());
082            int maxY = (int) (plotArea.getMaxY());
083            int midY = ((maxY - minY) / 2) + minY;
084    
085            int midX = (int) (plotArea.getMinX() + (plotArea.getWidth() / 2));
086            //int midY = (int) (plotArea.getMinY() + (plotArea.getHeight() / 2));
087            int lenX = (int) (plotArea.getWidth() / 10);
088            if (lenX < 2) {
089                lenX = 2;
090            }
091    
092            pointer.moveTo(midX - lenX, midY - lenX);
093            pointer.lineTo(midX + lenX, midY - lenX);
094            pointer.lineTo(midX, minY);
095            pointer.closePath();
096    
097            lenX = 4 * lenX;
098            Ellipse2D circle = new Ellipse2D.Double(midX - lenX / 2,
099                                                    midY - lenX, lenX, lenX);
100    
101            shape = new Area(circle);
102            shape.add(new Area(pointer));
103            if ((rotate != null) && (angle != 0)) {
104                /// we have rotation
105                getTransform().setToRotation(angle, rotate.getX(), rotate.getY());
106                shape.transform(getTransform());
107            }
108    
109            defaultDisplay(g2, shape);
110    
111        }
112    
113        /**
114         * Tests another object for equality with this object.
115         *
116         * @param object  the object to test.
117         *
118         * @return A boolean.
119         */
120        public boolean equals(Object object) {
121            if (object == null) {
122                return false;
123            }
124            if (object == this) {
125                return true;
126            }
127            if (super.equals(object) && object instanceof MiddlePinNeedle) {
128                return true;
129            }
130            return false;
131        }
132        
133        /**
134         * Returns a clone of this needle.
135         * 
136         * @return A clone.
137         * 
138         * @throws CloneNotSupportedException if the <code>MiddlePinNeedle</code> 
139         *     cannot be cloned (in theory, this should not happen).
140         */
141        public Object clone() throws CloneNotSupportedException {
142            return super.clone();   
143        }
144    
145    }