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