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 * LineNeedle.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.Shape;
042import java.awt.geom.Line2D;
043import java.awt.geom.Point2D;
044import java.awt.geom.Rectangle2D;
045import java.io.Serializable;
046
047/**
048 * A needle that is represented by a line.
049 */
050public class LineNeedle extends MeterNeedle implements Cloneable, Serializable {
051
052    /** For serialization. */
053    private static final long serialVersionUID = 6215321387896748945L;
054
055    /**
056     * Draws the needle.
057     *
058     * @param g2  the graphics device.
059     * @param plotArea  the plot area.
060     * @param rotate  the rotation point.
061     * @param angle  the angle.
062     */
063    @Override
064    protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea,
065            Point2D rotate, double angle) {
066
067        Line2D shape = new Line2D.Double();
068
069        double x = plotArea.getMinX() + (plotArea.getWidth() / 2);
070        shape.setLine(x, plotArea.getMinY(), x, plotArea.getMaxY());
071
072        Shape s = shape;
073
074        if ((rotate != null) && (angle != 0)) {
075            /// we have rotation
076            getTransform().setToRotation(angle, rotate.getX(), rotate.getY());
077            s = getTransform().createTransformedShape(s);
078        }
079
080        defaultDisplay(g2, s);
081
082    }
083
084    /**
085     * Tests another object for equality with this object.
086     *
087     * @param obj  the object to test ({@code null} permitted).
088     *
089     * @return A boolean.
090     */
091    @Override
092    public boolean equals(Object obj) {
093        if (obj == this) {
094            return true;
095        }
096        if (!(obj instanceof LineNeedle)) {
097            return false;
098        }
099        return super.equals(obj);
100    }
101
102    /**
103     * Returns a hash code for this instance.
104     *
105     * @return A hash code.
106     */
107    @Override
108    public int hashCode() {
109        return super.hashCode();
110    }
111
112    /**
113     * Returns a clone of this needle.
114     *
115     * @return A clone.
116     *
117     * @throws CloneNotSupportedException if the {@code LineNeedle}
118     *     cannot be cloned (in theory, this should not happen).
119     */
120    @Override
121    public Object clone() throws CloneNotSupportedException {
122        return super.clone();
123    }
124
125}