001/* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2007, 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 2002-2007, 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 * 27-Mar-2003 : Implemented Serializable (DG);
040 * 09-Sep-2003 : Added equals() method (DG);
041 * 16-Mar-2004 : Implemented Rotation
042 */
043
044package org.jfree.chart.needle;
045
046import java.awt.Graphics2D;
047import java.awt.Shape;
048import java.awt.geom.GeneralPath;
049import java.awt.geom.Point2D;
050import java.awt.geom.Rectangle2D;
051import java.io.Serializable;
052
053/**
054 * A needle that is represented by a long line.
055 */
056public class LongNeedle extends MeterNeedle 
057                        implements Cloneable, Serializable {
058
059    /** For serialization. */
060    private static final long serialVersionUID = -4319985779783688159L;
061    
062    /**
063     * Default constructor.
064     */
065    public LongNeedle() {
066        super();
067        setRotateY(0.8);
068    }
069
070    /**
071     * Draws the needle.
072     *
073     * @param g2  the graphics device.
074     * @param plotArea  the plot area.
075     * @param rotate  the rotation point.
076     * @param angle  the angle.
077     */
078    protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea, 
079                              Point2D rotate, double angle) {
080
081        GeneralPath shape1 = new GeneralPath();
082        GeneralPath shape2 = new GeneralPath();
083        GeneralPath shape3 = new GeneralPath();
084
085        float minX = (float) plotArea.getMinX();
086        float minY = (float) plotArea.getMinY();
087        float maxX = (float) plotArea.getMaxX();
088        float maxY = (float) plotArea.getMaxY();
089        //float midX = (float) (minX + (plotArea.getWidth() * getRotateX()));
090        //float midY = (float) (minY + (plotArea.getHeight() * getRotateY()));
091        float midX = (float) (minX + (plotArea.getWidth() * 0.5));
092        float midY = (float) (minY + (plotArea.getHeight() * 0.8));
093        float y = maxY - (2 * (maxY - midY));
094        if (y < minY) {
095            y = minY;
096        }
097        shape1.moveTo(minX, midY);
098        shape1.lineTo(midX, minY);
099        shape1.lineTo(midX, y);
100        shape1.closePath();
101
102        shape2.moveTo(maxX, midY);
103        shape2.lineTo(midX, minY);
104        shape2.lineTo(midX, y);
105        shape2.closePath();
106
107        shape3.moveTo(minX, midY);
108        shape3.lineTo(midX, maxY);
109        shape3.lineTo(maxX, midY);
110        shape3.lineTo(midX, y);
111        shape3.closePath();
112
113        Shape s1 = shape1;
114        Shape s2 = shape2;
115        Shape s3 = shape3;
116
117        if ((rotate != null) && (angle != 0)) {
118            /// we have rotation huston, please spin me
119            getTransform().setToRotation(angle, rotate.getX(), rotate.getY());
120            s1 = shape1.createTransformedShape(transform);
121            s2 = shape2.createTransformedShape(transform);
122            s3 = shape3.createTransformedShape(transform);
123        }
124
125
126        if (getHighlightPaint() != null) {
127            g2.setPaint(getHighlightPaint());
128            g2.fill(s3);
129        }
130
131        if (getFillPaint() != null) {
132            g2.setPaint(getFillPaint());
133            g2.fill(s1);
134            g2.fill(s2);
135        }
136
137
138        if (getOutlinePaint() != null) {
139            g2.setStroke(getOutlineStroke());
140            g2.setPaint(getOutlinePaint());
141            g2.draw(s1);
142            g2.draw(s2);
143            g2.draw(s3);
144        }
145    }
146
147    /**
148     * Tests another object for equality with this object.
149     *
150     * @param obj  the object to test (<code>null</code> permitted).
151     *
152     * @return A boolean.
153     */
154    public boolean equals(Object obj) {
155        if (obj == this) {
156            return true;
157        }
158        if (!(obj instanceof LongNeedle)) {
159            return false;   
160        }
161        if (!super.equals(obj)) {
162            return false;
163        }
164        return true;
165    }
166
167    /**
168     * Returns a clone of this needle.
169     * 
170     * @return A clone.
171     * 
172     * @throws CloneNotSupportedException if the <code>LongNeedle</code> 
173     *     cannot be cloned (in theory, this should not happen).
174     */
175    public Object clone() throws CloneNotSupportedException {
176        return super.clone();   
177    }
178
179}