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 * 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     * 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        GeneralPath shape1 = new GeneralPath();
069        GeneralPath shape2 = new GeneralPath();
070        float minX = (float) plotArea.getMinX();
071        float minY = (float) plotArea.getMinY();
072        float maxX = (float) plotArea.getMaxX();
073        float maxY = (float) plotArea.getMaxY();
074        float midX = (float) (minX + (plotArea.getWidth() / 2));
075        float midY = (float) (minY + (plotArea.getHeight() / 2));
076
077        shape1.moveTo(minX, midY);
078        shape1.lineTo(midX, minY);
079        shape1.lineTo(maxX, midY);
080        shape1.closePath();
081
082        shape2.moveTo(minX, midY);
083        shape2.lineTo(midX, maxY);
084        shape2.lineTo(maxX, midY);
085        shape2.closePath();
086
087        if ((rotate != null) && (angle != 0)) {
088            /// we have rotation huston, please spin me
089            getTransform().setToRotation(angle, rotate.getX(), rotate.getY());
090            shape1.transform(getTransform());
091            shape2.transform(getTransform());
092        }
093
094        if (getFillPaint() != null) {
095            g2.setPaint(getFillPaint());
096            g2.fill(shape1);
097        }
098
099        if (getHighlightPaint() != null) {
100            g2.setPaint(getHighlightPaint());
101            g2.fill(shape2);
102        }
103
104        if (getOutlinePaint() != null) {
105            g2.setStroke(getOutlineStroke());
106            g2.setPaint(getOutlinePaint());
107            g2.draw(shape1);
108            g2.draw(shape2);
109        }
110    }
111
112    /**
113     * Tests another object for equality with this object.
114     *
115     * @param obj  the object to test ({@code null} permitted).
116     *
117     * @return A boolean.
118     */
119    @Override
120    public boolean equals(Object obj) {
121        if (obj == this) {
122            return true;
123        }
124        if (!(obj instanceof PointerNeedle)) {
125            return false;
126        }
127        if (!super.equals(obj)) {
128            return false;
129        }
130        return true;
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 PointerNeedle}
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}