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 * PointerNeedle.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.GeneralPath;
042import java.awt.geom.Point2D;
043import java.awt.geom.Rectangle2D;
044import java.io.Serializable;
045
046/**
047 * A needle in the shape of a pointer, for use with the
048 * {@link org.jfree.chart.plot.CompassPlot} class.
049 */
050public class PointerNeedle extends MeterNeedle implements Cloneable, 
051        Serializable {
052
053    /** For serialization. */
054    private static final long serialVersionUID = -4744677345334729606L;
055
056    /**
057     * Creates a new instance.
058     */
059    public PointerNeedle() {
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        GeneralPath shape1 = new GeneralPath();
076        GeneralPath shape2 = new GeneralPath();
077        float minX = (float) plotArea.getMinX();
078        float minY = (float) plotArea.getMinY();
079        float maxX = (float) plotArea.getMaxX();
080        float maxY = (float) plotArea.getMaxY();
081        float midX = (float) (minX + (plotArea.getWidth() / 2));
082        float midY = (float) (minY + (plotArea.getHeight() / 2));
083
084        shape1.moveTo(minX, midY);
085        shape1.lineTo(midX, minY);
086        shape1.lineTo(maxX, midY);
087        shape1.closePath();
088
089        shape2.moveTo(minX, midY);
090        shape2.lineTo(midX, maxY);
091        shape2.lineTo(maxX, midY);
092        shape2.closePath();
093
094        if ((rotate != null) && (angle != 0)) {
095            /// we have rotation huston, please spin me
096            getTransform().setToRotation(angle, rotate.getX(), rotate.getY());
097            shape1.transform(getTransform());
098            shape2.transform(getTransform());
099        }
100
101        if (getFillPaint() != null) {
102            g2.setPaint(getFillPaint());
103            g2.fill(shape1);
104        }
105
106        if (getHighlightPaint() != null) {
107            g2.setPaint(getHighlightPaint());
108            g2.fill(shape2);
109        }
110
111        if (getOutlinePaint() != null) {
112            g2.setStroke(getOutlineStroke());
113            g2.setPaint(getOutlinePaint());
114            g2.draw(shape1);
115            g2.draw(shape2);
116        }
117    }
118
119    /**
120     * Tests another object for equality with this object.
121     *
122     * @param obj  the object to test ({@code null} permitted).
123     *
124     * @return A boolean.
125     */
126    @Override
127    public boolean equals(Object obj) {
128        if (obj == this) {
129            return true;
130        }
131        if (!(obj instanceof PointerNeedle)) {
132            return false;
133        }
134        if (!super.equals(obj)) {
135            return false;
136        }
137        return true;
138    }
139
140    /**
141     * Returns a hash code for this instance.
142     *
143     * @return A hash code.
144     */
145    @Override
146    public int hashCode() {
147        return super.hashCode();
148    }
149
150    /**
151     * Returns a clone of this needle.
152     *
153     * @return A clone.
154     *
155     * @throws CloneNotSupportedException if the {@code PointerNeedle}
156     *     cannot be cloned (in theory, this should not happen).
157     */
158    @Override
159    public Object clone() throws CloneNotSupportedException {
160        return super.clone();
161    }
162
163}