001/* ======================================================
002 * JFreeChart : a chart library for the Java(tm) platform
003 * ======================================================
004 *
005 * (C) Copyright 2000-present, by David Gilbert and Contributors.
006 *
007 * Project Info:  https://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     * Creates a new instance.
059     */
060    public MiddlePinNeedle() {
061        super();
062    }
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        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 / 2.0,
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    @Override
120    public boolean equals(Object object) {
121        if (object == null) {
122            return false;
123        }
124        if (object == this) {
125            return true;
126        }
127        if (super.equals(object) && object instanceof MiddlePinNeedle) {
128            return true;
129        }
130        return false;
131    }
132
133    /**
134     * Returns a hash code for this instance.
135     *
136     * @return A hash code.
137     */
138    @Override
139    public int hashCode() {
140        return super.hashCode();
141    }
142
143    /**
144     * Returns a clone of this needle.
145     *
146     * @return A clone.
147     *
148     * @throws CloneNotSupportedException if the {@code MiddlePinNeedle}
149     *     cannot be cloned (in theory, this should not happen).
150     */
151    @Override
152    public Object clone() throws CloneNotSupportedException {
153        return super.clone();
154    }
155
156}