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 * MiddlePinNeedle.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 : Implemented hashCode() (DG);
043 *
044 */
045
046 package org.jfree.chart.needle;
047
048 import java.awt.Graphics2D;
049 import java.awt.geom.Area;
050 import java.awt.geom.Ellipse2D;
051 import java.awt.geom.GeneralPath;
052 import java.awt.geom.Point2D;
053 import java.awt.geom.Rectangle2D;
054 import java.io.Serializable;
055
056 /**
057 * A needle that is drawn as a pin shape.
058 */
059 public class MiddlePinNeedle extends MeterNeedle
060 implements Cloneable, Serializable {
061
062 /** For serialization. */
063 private static final long serialVersionUID = 6237073996403125310L;
064
065 /**
066 * Draws the needle.
067 *
068 * @param g2 the graphics device.
069 * @param plotArea the plot area.
070 * @param rotate the rotation point.
071 * @param angle the angle.
072 */
073 protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea,
074 Point2D rotate, double angle) {
075
076 Area shape;
077 GeneralPath pointer = new GeneralPath();
078
079 int minY = (int) (plotArea.getMinY());
080 //int maxX = (int) (plotArea.getMaxX());
081 int maxY = (int) (plotArea.getMaxY());
082 int midY = ((maxY - minY) / 2) + minY;
083
084 int midX = (int) (plotArea.getMinX() + (plotArea.getWidth() / 2));
085 //int midY = (int) (plotArea.getMinY() + (plotArea.getHeight() / 2));
086 int lenX = (int) (plotArea.getWidth() / 10);
087 if (lenX < 2) {
088 lenX = 2;
089 }
090
091 pointer.moveTo(midX - lenX, midY - lenX);
092 pointer.lineTo(midX + lenX, midY - lenX);
093 pointer.lineTo(midX, minY);
094 pointer.closePath();
095
096 lenX = 4 * lenX;
097 Ellipse2D circle = new Ellipse2D.Double(midX - lenX / 2,
098 midY - lenX, lenX, lenX);
099
100 shape = new Area(circle);
101 shape.add(new Area(pointer));
102 if ((rotate != null) && (angle != 0)) {
103 /// we have rotation
104 getTransform().setToRotation(angle, rotate.getX(), rotate.getY());
105 shape.transform(getTransform());
106 }
107
108 defaultDisplay(g2, shape);
109
110 }
111
112 /**
113 * Tests another object for equality with this object.
114 *
115 * @param object the object to test.
116 *
117 * @return A boolean.
118 */
119 public boolean equals(Object object) {
120 if (object == null) {
121 return false;
122 }
123 if (object == this) {
124 return true;
125 }
126 if (super.equals(object) && object instanceof MiddlePinNeedle) {
127 return true;
128 }
129 return false;
130 }
131
132 /**
133 * Returns a hash code for this instance.
134 *
135 * @return A hash code.
136 */
137 public int hashCode() {
138 return super.hashCode();
139 }
140
141 /**
142 * Returns a clone of this needle.
143 *
144 * @return A clone.
145 *
146 * @throws CloneNotSupportedException if the <code>MiddlePinNeedle</code>
147 * cannot be cloned (in theory, this should not happen).
148 */
149 public Object clone() throws CloneNotSupportedException {
150 return super.clone();
151 }
152
153 }