001 /* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2006, 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 * PinNeedle.java
029 * --------------
030 * (C) Copyright 2002-2006, 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: MiddlePinNeedle.java,v 1.4.2.3 2006/08/02 10:40:57 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 * 08-Jun-2005 : Implemented Cloneable (DG);
044 *
045 */
046
047 package org.jfree.chart.needle;
048
049 import java.awt.Graphics2D;
050 import java.awt.geom.Area;
051 import java.awt.geom.Ellipse2D;
052 import java.awt.geom.GeneralPath;
053 import java.awt.geom.Point2D;
054 import java.awt.geom.Rectangle2D;
055 import java.io.Serializable;
056
057 /**
058 * A needle that is drawn as a pin shape.
059 */
060 public class MiddlePinNeedle extends MeterNeedle
061 implements Cloneable, Serializable {
062
063 /** For serialization. */
064 private static final long serialVersionUID = 6237073996403125310L;
065
066 /**
067 * Draws the needle.
068 *
069 * @param g2 the graphics device.
070 * @param plotArea the plot area.
071 * @param rotate the rotation point.
072 * @param angle the angle.
073 */
074 protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea,
075 Point2D rotate, double angle) {
076
077 Area shape;
078 GeneralPath pointer = new GeneralPath();
079
080 int minY = (int) (plotArea.getMinY());
081 //int maxX = (int) (plotArea.getMaxX());
082 int maxY = (int) (plotArea.getMaxY());
083 int midY = ((maxY - minY) / 2) + minY;
084
085 int midX = (int) (plotArea.getMinX() + (plotArea.getWidth() / 2));
086 //int midY = (int) (plotArea.getMinY() + (plotArea.getHeight() / 2));
087 int lenX = (int) (plotArea.getWidth() / 10);
088 if (lenX < 2) {
089 lenX = 2;
090 }
091
092 pointer.moveTo(midX - lenX, midY - lenX);
093 pointer.lineTo(midX + lenX, midY - lenX);
094 pointer.lineTo(midX, minY);
095 pointer.closePath();
096
097 lenX = 4 * lenX;
098 Ellipse2D circle = new Ellipse2D.Double(midX - lenX / 2,
099 midY - lenX, lenX, lenX);
100
101 shape = new Area(circle);
102 shape.add(new Area(pointer));
103 if ((rotate != null) && (angle != 0)) {
104 /// we have rotation
105 getTransform().setToRotation(angle, rotate.getX(), rotate.getY());
106 shape.transform(getTransform());
107 }
108
109 defaultDisplay(g2, shape);
110
111 }
112
113 /**
114 * Tests another object for equality with this object.
115 *
116 * @param object the object to test.
117 *
118 * @return A boolean.
119 */
120 public boolean equals(Object object) {
121 if (object == null) {
122 return false;
123 }
124 if (object == this) {
125 return true;
126 }
127 if (super.equals(object) && object instanceof MiddlePinNeedle) {
128 return true;
129 }
130 return false;
131 }
132
133 /**
134 * Returns a clone of this needle.
135 *
136 * @return A clone.
137 *
138 * @throws CloneNotSupportedException if the <code>MiddlePinNeedle</code>
139 * cannot be cloned (in theory, this should not happen).
140 */
141 public Object clone() throws CloneNotSupportedException {
142 return super.clone();
143 }
144
145 }