001/* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2008, 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 2002-2008, 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.Area;
050import java.awt.geom.Ellipse2D;
051import java.awt.geom.GeneralPath;
052import java.awt.geom.Point2D;
053import java.awt.geom.Rectangle2D;
054import java.io.Serializable;
055
056/**
057 * A needle that is drawn as a pin shape.
058 */
059public class MiddlePinNeedle extends MeterNeedle
060                             implements Cloneable, Serializable {
061
062    /** For serialization. */
063    private static final long serialVersionUID = 6237073996403125310L;
064
065    /**
066     * Draws the needle.
067     *
068     * @param g2  the graphics device.
069     * @param plotArea  the plot area.
070     * @param rotate  the rotation point.
071     * @param angle  the angle.
072     */
073    protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea,
074                              Point2D rotate, double angle) {
075
076        Area shape;
077        GeneralPath pointer = new GeneralPath();
078
079        int minY = (int) (plotArea.getMinY());
080        //int maxX = (int) (plotArea.getMaxX());
081        int maxY = (int) (plotArea.getMaxY());
082        int midY = ((maxY - minY) / 2) + minY;
083
084        int midX = (int) (plotArea.getMinX() + (plotArea.getWidth() / 2));
085        //int midY = (int) (plotArea.getMinY() + (plotArea.getHeight() / 2));
086        int lenX = (int) (plotArea.getWidth() / 10);
087        if (lenX < 2) {
088            lenX = 2;
089        }
090
091        pointer.moveTo(midX - lenX, midY - lenX);
092        pointer.lineTo(midX + lenX, midY - lenX);
093        pointer.lineTo(midX, minY);
094        pointer.closePath();
095
096        lenX = 4 * lenX;
097        Ellipse2D circle = new Ellipse2D.Double(midX - lenX / 2,
098                                                midY - lenX, lenX, lenX);
099
100        shape = new Area(circle);
101        shape.add(new Area(pointer));
102        if ((rotate != null) && (angle != 0)) {
103            /// we have rotation
104            getTransform().setToRotation(angle, rotate.getX(), rotate.getY());
105            shape.transform(getTransform());
106        }
107
108        defaultDisplay(g2, shape);
109
110    }
111
112    /**
113     * Tests another object for equality with this object.
114     *
115     * @param object  the object to test.
116     *
117     * @return A boolean.
118     */
119    public boolean equals(Object object) {
120        if (object == null) {
121            return false;
122        }
123        if (object == this) {
124            return true;
125        }
126        if (super.equals(object) && object instanceof MiddlePinNeedle) {
127            return true;
128        }
129        return false;
130    }
131
132    /**
133     * Returns a hash code for this instance.
134     *
135     * @return A hash code.
136     */
137    public int hashCode() {
138        return super.hashCode();
139    }
140
141    /**
142     * Returns a clone of this needle.
143     *
144     * @return A clone.
145     *
146     * @throws CloneNotSupportedException if the <code>MiddlePinNeedle</code>
147     *     cannot be cloned (in theory, this should not happen).
148     */
149    public Object clone() throws CloneNotSupportedException {
150        return super.clone();
151    }
152
153}