001/* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2013, 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 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
025 * Other names may be trademarks of their respective owners.]
026 *
027 * ---------------
028 * PlumNeedle.java
029 * ---------------
030 * (C) Copyright 2002-2008, 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 * 22-Nov-2007 : Implemented hashCode() (DG);
043 *
044 */
045
046package org.jfree.chart.needle;
047
048import java.awt.Graphics2D;
049import java.awt.geom.Arc2D;
050import java.awt.geom.Area;
051import java.awt.geom.Point2D;
052import java.awt.geom.Rectangle2D;
053import java.io.Serializable;
054
055/**
056 * A needle for use with the {@link org.jfree.chart.plot.CompassPlot} class.
057 */
058public class PlumNeedle extends MeterNeedle
059                        implements Cloneable, Serializable {
060
061    /** For serialization. */
062    private static final long serialVersionUID = -3082660488660600718L;
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    @Override
073    protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea,
074                              Point2D rotate, double angle) {
075
076        Arc2D shape = new Arc2D.Double(Arc2D.PIE);
077        double radius = plotArea.getHeight();
078        double halfX = plotArea.getWidth() / 2;
079        double diameter = 2 * radius;
080
081        shape.setFrame(plotArea.getMinX() + halfX - radius ,
082                       plotArea.getMinY() - radius,
083                       diameter, diameter);
084        radius = Math.toDegrees(Math.asin(halfX / radius));
085        shape.setAngleStart(270 - radius);
086        shape.setAngleExtent(2 * radius);
087
088        Area s = new Area(shape);
089
090        if ((rotate != null) && (angle != 0)) {
091            /// we have rotation houston, please spin me
092            getTransform().setToRotation(angle, rotate.getX(), rotate.getY());
093            s.transform(getTransform());
094        }
095
096        defaultDisplay(g2, s);
097    }
098
099    /**
100     * Tests another object for equality with this object.
101     *
102     * @param obj  the object to test (<code>null</code> permitted).
103     *
104     * @return A boolean.
105     */
106    @Override
107    public boolean equals(Object obj) {
108        if (obj == this) {
109            return true;
110        }
111        if (!(obj instanceof PlumNeedle)) {
112            return false;
113        }
114        if (!super.equals(obj)) {
115            return false;
116        }
117        return true;
118    }
119
120    /**
121     * Returns a hash code for this instance.
122     *
123     * @return A hash code.
124     */
125    @Override
126    public int hashCode() {
127        return super.hashCode();
128    }
129
130    /**
131     * Returns a clone of this needle.
132     *
133     * @return A clone.
134     *
135     * @throws CloneNotSupportedException if the <code>PlumNeedle</code>
136     *     cannot be cloned (in theory, this should not happen).
137     */
138    @Override
139    public Object clone() throws CloneNotSupportedException {
140        return super.clone();
141    }
142
143}