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 * 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    @Override
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    @Override
121    public boolean equals(Object object) {
122        if (object == null) {
123            return false;
124        }
125        if (object == this) {
126            return true;
127        }
128        if (super.equals(object) && object instanceof MiddlePinNeedle) {
129            return true;
130        }
131        return false;
132    }
133
134    /**
135     * Returns a hash code for this instance.
136     *
137     * @return A hash code.
138     */
139    @Override
140    public int hashCode() {
141        return super.hashCode();
142    }
143
144    /**
145     * Returns a clone of this needle.
146     *
147     * @return A clone.
148     *
149     * @throws CloneNotSupportedException if the <code>MiddlePinNeedle</code>
150     *     cannot be cloned (in theory, this should not happen).
151     */
152    @Override
153    public Object clone() throws CloneNotSupportedException {
154        return super.clone();
155    }
156
157}