    001    /* ===========================================================
    002     * JFreeChart : a free chart library for the Java(tm) platform
    003     * ===========================================================
    004     *
    005     * (C) Copyright 2000-2005, 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     * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
    025     * in the United States and other countries.]
    026     *
    027     * ---------------
    028     * LongNeedle.java
    029     * ---------------
    030     * (C) Copyright 2002-2005, 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     * $Id: LongNeedle.java,v 1.4.2.2 2005/10/25 20:50:49 mungady Exp $
    037     *
    038     * Changes:
    039     * --------
    040     * 25-Sep-2002 : Version 1, contributed by Bryan Scott (DG);
    041     * 27-Mar-2003 : Implemented Serializable (DG);
    042     * 09-Sep-2003 : Added equals() method (DG);
    043     * 16-Mar-2004 : Implemented Rotation
    044     */
    045
    046    package org.jfree.chart.needle;
    047
    048    import java.awt.Graphics2D;
    049    import java.awt.geom.GeneralPath;
    050    import java.awt.geom.Point2D;
    051    import java.awt.geom.Rectangle2D;
    052    import java.awt.Shape;
    053    import java.io.Serializable;
    054
    055    /**
    056     * A needle that is represented by a long line.
    057     *
    058     * @author Bryan Scott
    059     */
    060    public class LongNeedle extends MeterNeedle
    061                            implements Cloneable, Serializable {
    062
    063        /** For serialization. */
    064        private static final long serialVersionUID = -4319985779783688159L;
    065
    066        /**
    067         * Default constructor.
    068         */
    069        public LongNeedle() {
    070            super();
    071            setRotateY(0.8);
    072        }
    073
    074        /**
    075         * Draws the needle.
    076         *
    077         * @param g2  the graphics device.
    078         * @param plotArea  the plot area.
    079         * @param rotate  the rotation point.
    080         * @param angle  the angle.
    081         */
    082        protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea,
    083                                  Point2D rotate, double angle) {
    084
    085            GeneralPath shape1 = new GeneralPath();
    086            GeneralPath shape2 = new GeneralPath();
    087            GeneralPath shape3 = new GeneralPath();
    088
    089            float minX = (float) plotArea.getMinX();
    090            float minY = (float) plotArea.getMinY();
    091            float maxX = (float) plotArea.getMaxX();
    092            float maxY = (float) plotArea.getMaxY();
    093            //float midX = (float) (minX + (plotArea.getWidth() * getRotateX()));
    094            //float midY = (float) (minY + (plotArea.getHeight() * getRotateY()));
    095            float midX = (float) (minX + (plotArea.getWidth() * 0.5));
    096            float midY = (float) (minY + (plotArea.getHeight() * 0.8));
    097            float y = maxY - (2 * (maxY - midY));
    098            if (y < minY) {
    099                y = minY;
    100            }
    101            shape1.moveTo(minX, midY);
    102            shape1.lineTo(midX, minY);
    103            shape1.lineTo(midX, y);
    104            shape1.closePath();
    105
    106            shape2.moveTo(maxX, midY);
    107            shape2.lineTo(midX, minY);
    108            shape2.lineTo(midX, y);
    109            shape2.closePath();
    110
    111            shape3.moveTo(minX, midY);
    112            shape3.lineTo(midX, maxY);
    113            shape3.lineTo(maxX, midY);
    114            shape3.lineTo(midX, y);
    115            shape3.closePath();
    116
    117            Shape s1 = shape1;
    118            Shape s2 = shape2;
    119            Shape s3 = shape3;
    120
    121            if ((rotate != null) && (angle != 0)) {
    122                /// we have rotation huston, please spin me
    123                getTransform().setToRotation(angle, rotate.getX(), rotate.getY());
    124                s1 = shape1.createTransformedShape(transform);
    125                s2 = shape2.createTransformedShape(transform);
    126                s3 = shape3.createTransformedShape(transform);
    127            }
    128
    129
    130            if (getHighlightPaint() != null) {
    131                g2.setPaint(getHighlightPaint());
    132                g2.fill(s3);
    133            }
    134
    135            if (getFillPaint() != null) {
    136                g2.setPaint(getFillPaint());
    137                g2.fill(s1);
    138                g2.fill(s2);
    139            }
    140
    141
    142            if (getOutlinePaint() != null) {
    143                g2.setStroke(getOutlineStroke());
    144                g2.setPaint(getOutlinePaint());
    145                g2.draw(s1);
    146                g2.draw(s2);
    147                g2.draw(s3);
    148            }
    149        }
    150
    151        /**
    152         * Tests another object for equality with this object.
    153         *
    154         * @param obj  the object to test (<code>null</code> permitted).
    155         *
    156         * @return A boolean.
    157         */
    158        public boolean equals(Object obj) {
    159            if (obj == this) {
    160                return true;
    161            }
    162            if (!(obj instanceof LongNeedle)) {
    163                return false;
    164            }
    165            if (!super.equals(obj)) {
    166                return false;
    167            }
    168            return true;
    169        }
    170
    171        /**
    172         * Returns a clone of this needle.
    173         *
    174         * @return A clone.
    175         */
    176        public Object clone() throws CloneNotSupportedException {
    177            return super.clone();
    178        }
    179
    180    }