001/* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-present, by David Gilbert 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-present, by the Australian Antarctic Division and
031 *                          Contributors.
032 *
033 * Original Author:  Bryan Scott (for the Australian Antarctic Division);
034 * Contributor(s):   David Gilbert;
035 *
036 */
037
038package org.jfree.chart.needle;
039
040import java.awt.Graphics2D;
041import java.awt.geom.Area;
042import java.awt.geom.Ellipse2D;
043import java.awt.geom.GeneralPath;
044import java.awt.geom.Point2D;
045import java.awt.geom.Rectangle2D;
046import java.io.Serializable;
047
048/**
049 * A needle that is drawn as a pin shape.
050 */
051public class MiddlePinNeedle extends MeterNeedle implements Cloneable, 
052        Serializable {
053
054    /** For serialization. */
055    private static final long serialVersionUID = 6237073996403125310L;
056
057    /**
058     * Draws the needle.
059     *
060     * @param g2  the graphics device.
061     * @param plotArea  the plot area.
062     * @param rotate  the rotation point.
063     * @param angle  the angle.
064     */
065    @Override
066    protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea,
067            Point2D rotate, double angle) {
068
069        Area shape;
070        GeneralPath pointer = new GeneralPath();
071
072        int minY = (int) (plotArea.getMinY());
073        //int maxX = (int) (plotArea.getMaxX());
074        int maxY = (int) (plotArea.getMaxY());
075        int midY = ((maxY - minY) / 2) + minY;
076
077        int midX = (int) (plotArea.getMinX() + (plotArea.getWidth() / 2));
078        //int midY = (int) (plotArea.getMinY() + (plotArea.getHeight() / 2));
079        int lenX = (int) (plotArea.getWidth() / 10);
080        if (lenX < 2) {
081            lenX = 2;
082        }
083
084        pointer.moveTo(midX - lenX, midY - lenX);
085        pointer.lineTo(midX + lenX, midY - lenX);
086        pointer.lineTo(midX, minY);
087        pointer.closePath();
088
089        lenX = 4 * lenX;
090        Ellipse2D circle = new Ellipse2D.Double(midX - lenX / 2.0,
091                                                midY - lenX, lenX, lenX);
092
093        shape = new Area(circle);
094        shape.add(new Area(pointer));
095        if ((rotate != null) && (angle != 0)) {
096            /// we have rotation
097            getTransform().setToRotation(angle, rotate.getX(), rotate.getY());
098            shape.transform(getTransform());
099        }
100
101        defaultDisplay(g2, shape);
102
103    }
104
105    /**
106     * Tests another object for equality with this object.
107     *
108     * @param object  the object to test.
109     *
110     * @return A boolean.
111     */
112    @Override
113    public boolean equals(Object object) {
114        if (object == null) {
115            return false;
116        }
117        if (object == this) {
118            return true;
119        }
120        if (super.equals(object) && object instanceof MiddlePinNeedle) {
121            return true;
122        }
123        return false;
124    }
125
126    /**
127     * Returns a hash code for this instance.
128     *
129     * @return A hash code.
130     */
131    @Override
132    public int hashCode() {
133        return super.hashCode();
134    }
135
136    /**
137     * Returns a clone of this needle.
138     *
139     * @return A clone.
140     *
141     * @throws CloneNotSupportedException if the {@code MiddlePinNeedle}
142     *     cannot be cloned (in theory, this should not happen).
143     */
144    @Override
145    public Object clone() throws CloneNotSupportedException {
146        return super.clone();
147    }
148
149}