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 * PinNeedle.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 PinNeedle extends MeterNeedle implements Cloneable, Serializable {
052
053    /** For serialization. */
054    private static final long serialVersionUID = -3787089953079863373L;
055
056    /**
057     * Creates a new instance.
058     */
059    public PinNeedle() {
060        super();
061    }
062
063    /**
064     * Draws the needle.
065     *
066     * @param g2  the graphics device.
067     * @param plotArea  the plot area.
068     * @param rotate  the rotation point.
069     * @param angle  the angle.
070     */
071    @Override
072    protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea,
073            Point2D rotate, double angle) {
074
075        Area shape;
076        GeneralPath pointer = new GeneralPath();
077
078        int minY = (int) (plotArea.getMinY());
079        //int maxX = (int) (plotArea.getMaxX());
080        int maxY = (int) (plotArea.getMaxY());
081        int midX = (int) (plotArea.getMinX() + (plotArea.getWidth() / 2));
082        //int midY = (int) (plotArea.getMinY() + (plotArea.getHeight() / 2));
083        int lenX = (int) (plotArea.getWidth() / 10);
084        if (lenX < 2) {
085            lenX = 2;
086        }
087
088        pointer.moveTo(midX - lenX, maxY - lenX);
089        pointer.lineTo(midX + lenX, maxY - lenX);
090        pointer.lineTo(midX, minY + lenX);
091        pointer.closePath();
092
093        lenX = 4 * lenX;
094        Ellipse2D circle = new Ellipse2D.Double(midX - lenX / 2.0,
095                plotArea.getMaxY() - lenX, lenX, lenX);
096
097        shape = new Area(circle);
098        shape.add(new Area(pointer));
099        if ((rotate != null) && (angle != 0)) {
100            /// we have rotation
101            getTransform().setToRotation(angle, rotate.getX(), rotate.getY());
102            shape.transform(getTransform());
103        }
104
105        defaultDisplay(g2, shape);
106
107    }
108
109    /**
110     * Tests another object for equality with this object.
111     *
112     * @param obj  the object to test ({@code null} permitted).
113     *
114     * @return A boolean.
115     */
116    @Override
117    public boolean equals(Object obj) {
118        if (obj == this) {
119            return true;
120        }
121        if (!(obj instanceof PinNeedle)) {
122            return false;
123        }
124        if (!super.equals(obj)) {
125            return false;
126        }
127        return true;
128    }
129
130    /**
131     * Returns a hash code for this instance.
132     *
133     * @return A hash code.
134     */
135    @Override
136    public int hashCode() {
137        return super.hashCode();
138    }
139
140    /**
141     * Returns a clone of this needle.
142     *
143     * @return A clone.
144     *
145     * @throws CloneNotSupportedException if the {@code PinNeedle}
146     *     cannot be cloned (in theory, this should not happen).
147     */
148    @Override
149    public Object clone() throws CloneNotSupportedException {
150        return super.clone();
151    }
152
153}