    001/* ===========================================================
    002 * JFreeChart : a free chart library for the Java(tm) platform
    003 * ===========================================================
    004 *
    005 * (C) Copyright 2000-2011, by Object Refinery Limited 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 2002-2008, by the Australian Antarctic Division and
    031 *                          Contributors.
    032 *
    033 * Original Author:  Bryan Scott (for the Australian Antarctic Division);
    034 * Contributor(s):   David Gilbert (for Object Refinery Limited);
    035 *
    036 * Changes:
    037 * --------
    038 * 25-Sep-2002 : Version 1, contributed by Bryan Scott (DG);
    039 * 26-Mar-2003 : Implemented Serializable (DG);
    040 * 09-Sep-2003 : Added equals() method (DG);
    041 * 08-Jun-2005 : Implemented Cloneable (DG);
    042 * 22-Nov-2007 : Implemented hashCode() (DG);
    043 *
    044 */
    045
    046package org.jfree.chart.needle;
    047
    048import java.awt.Graphics2D;
    049import java.awt.geom.GeneralPath;
    050import java.awt.geom.Point2D;
    051import java.awt.geom.Rectangle2D;
    052import java.io.Serializable;
    053
    054/**
    055 * A needle in the shape of a pointer, for use with the
    056 * {@link org.jfree.chart.plot.CompassPlot} class.
    057 */
    058public class PointerNeedle extends MeterNeedle
    059                           implements Cloneable, Serializable {
    060
    061    /** For serialization. */
    062    private static final long serialVersionUID = -4744677345334729606L;
    063
    064    /**
    065     * Draws the needle.
    066     *
    067     * @param g2  the graphics device.
    068     * @param plotArea  the plot area.
    069     * @param rotate  the rotation point.
    070     * @param angle  the angle.
    071     */
    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</code> permitted).
    123     *
    124     * @return A boolean.
    125     */
    126    public boolean equals(Object obj) {
    127        if (obj == this) {
    128            return true;
    129        }
    130        if (!(obj instanceof PointerNeedle)) {
    131            return false;
    132        }
    133        if (!super.equals(obj)) {
    134            return false;
    135        }
    136        return true;
    137    }
    138
    139    /**
    140     * Returns a hash code for this instance.
    141     *
    142     * @return A hash code.
    143     */
    144    public int hashCode() {
    145        return super.hashCode();
    146    }
    147
    148    /**
    149     * Returns a clone of this needle.
    150     *
    151     * @return A clone.
    152     *
    153     * @throws CloneNotSupportedException if the <code>PointerNeedle</code>
    154     *     cannot be cloned (in theory, this should not happen).
    155     */
    156    public Object clone() throws CloneNotSupportedException {
    157        return super.clone();
    158    }
    159
    160}