001/* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2007, 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 * MiddlePinNeedle.java
029 * --------------------
030 * (C) Copyright 2002-2007, 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 * 27-Mar-2003 : Implemented Serializable (DG);
040 * 09-Sep-2003 : Added equals() method (DG);
041 * 08-Jun-2005 : Implemented Cloneable (DG);
042 * 
043 */
044
045package org.jfree.chart.needle;
046
047import java.awt.Graphics2D;
048import java.awt.geom.Area;
049import java.awt.geom.Ellipse2D;
050import java.awt.geom.GeneralPath;
051import java.awt.geom.Point2D;
052import java.awt.geom.Rectangle2D;
053import java.io.Serializable;
054
055/**
056 * A needle that is drawn as a pin shape.
057 */
058public class MiddlePinNeedle extends MeterNeedle 
059                             implements Cloneable, Serializable {
060
061    /** For serialization. */
062    private static final long serialVersionUID = 6237073996403125310L;
063    
064    /**
065     * Draws the needle.
066     *
067     * @param g2  the graphics device.
068     * @param plotArea  the plot area.
069     * @param rotate  the rotation point.
070     * @param angle  the angle.
071     */
072    protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea, 
073                              Point2D rotate, double angle) {
074
075        Area shape;
076        GeneralPath pointer = new GeneralPath();
077
078        int minY = (int) (plotArea.getMinY());
079        //int maxX = (int) (plotArea.getMaxX());
080        int maxY = (int) (plotArea.getMaxY());
081        int midY = ((maxY - minY) / 2) + minY;
082
083        int midX = (int) (plotArea.getMinX() + (plotArea.getWidth() / 2));
084        //int midY = (int) (plotArea.getMinY() + (plotArea.getHeight() / 2));
085        int lenX = (int) (plotArea.getWidth() / 10);
086        if (lenX < 2) {
087            lenX = 2;
088        }
089
090        pointer.moveTo(midX - lenX, midY - lenX);
091        pointer.lineTo(midX + lenX, midY - lenX);
092        pointer.lineTo(midX, minY);
093        pointer.closePath();
094
095        lenX = 4 * lenX;
096        Ellipse2D circle = new Ellipse2D.Double(midX - lenX / 2,
097                                                midY - lenX, lenX, lenX);
098
099        shape = new Area(circle);
100        shape.add(new Area(pointer));
101        if ((rotate != null) && (angle != 0)) {
102            /// we have rotation
103            getTransform().setToRotation(angle, rotate.getX(), rotate.getY());
104            shape.transform(getTransform());
105        }
106
107        defaultDisplay(g2, shape);
108
109    }
110
111    /**
112     * Tests another object for equality with this object.
113     *
114     * @param object  the object to test.
115     *
116     * @return A boolean.
117     */
118    public boolean equals(Object object) {
119        if (object == null) {
120            return false;
121        }
122        if (object == this) {
123            return true;
124        }
125        if (super.equals(object) && object instanceof MiddlePinNeedle) {
126            return true;
127        }
128        return false;
129    }
130    
131    /**
132     * Returns a clone of this needle.
133     * 
134     * @return A clone.
135     * 
136     * @throws CloneNotSupportedException if the <code>MiddlePinNeedle</code> 
137     *     cannot be cloned (in theory, this should not happen).
138     */
139    public Object clone() throws CloneNotSupportedException {
140        return super.clone();   
141    }
142
143}