001 /* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2008, 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 * LineNeedle.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 * 27-Mar-2003 : Implemented Serializable (DG);
040 * 09-Sep-2003 : Added equals() method (DG);
041 * 08-Jun-2005 : Implemented Cloneable (DG);
042 * 22-Nov-2007 : Added hashCode() implementation (DG);
043 *
044 */
045
046 package org.jfree.chart.needle;
047
048 import java.awt.Graphics2D;
049 import java.awt.Shape;
050 import java.awt.geom.Line2D;
051 import java.awt.geom.Point2D;
052 import java.awt.geom.Rectangle2D;
053 import java.io.Serializable;
054
055 /**
056 * A needle that is represented by a line.
057 */
058 public class LineNeedle extends MeterNeedle
059 implements Cloneable, Serializable {
060
061 /** For serialization. */
062 private static final long serialVersionUID = 6215321387896748945L;
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 Line2D shape = new Line2D.Double();
076
077 double x = plotArea.getMinX() + (plotArea.getWidth() / 2);
078 shape.setLine(x, plotArea.getMinY(), x, plotArea.getMaxY());
079
080 Shape s = shape;
081
082 if ((rotate != null) && (angle != 0)) {
083 /// we have rotation
084 getTransform().setToRotation(angle, rotate.getX(), rotate.getY());
085 s = getTransform().createTransformedShape(s);
086 }
087
088 defaultDisplay(g2, s);
089
090 }
091
092 /**
093 * Tests another object for equality with this object.
094 *
095 * @param obj the object to test (<code>null</code> permitted).
096 *
097 * @return A boolean.
098 */
099 public boolean equals(Object obj) {
100 if (obj == this) {
101 return true;
102 }
103 if (!(obj instanceof LineNeedle)) {
104 return false;
105 }
106 return super.equals(obj);
107 }
108
109 /**
110 * Returns a hash code for this instance.
111 *
112 * @return A hash code.
113 */
114 public int hashCode() {
115 return super.hashCode();
116 }
117
118 /**
119 * Returns a clone of this needle.
120 *
121 * @return A clone.
122 *
123 * @throws CloneNotSupportedException if the <code>LineNeedle</code>
124 * cannot be cloned (in theory, this should not happen).
125 */
126 public Object clone() throws CloneNotSupportedException {
127 return super.clone();
128 }
129
130 }
131