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    }