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 * PlumNeedle.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: PlumNeedle.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.Arc2D; 051 import java.awt.geom.Area; 052 import java.awt.geom.Point2D; 053 import java.awt.geom.Rectangle2D; 054 import java.io.Serializable; 055 056 /** 057 * A needle for use with the {@link org.jfree.chart.plot.CompassPlot} class. 058 */ 059 public class PlumNeedle extends MeterNeedle 060 implements Cloneable, Serializable { 061 062 /** For serialization. */ 063 private static final long serialVersionUID = -3082660488660600718L; 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 Arc2D shape = new Arc2D.Double(Arc2D.PIE); 077 double radius = plotArea.getHeight(); 078 double halfX = plotArea.getWidth() / 2; 079 double diameter = 2 * radius; 080 081 shape.setFrame(plotArea.getMinX() + halfX - radius , 082 plotArea.getMinY() - radius, 083 diameter, diameter); 084 radius = Math.toDegrees(Math.asin(halfX / radius)); 085 shape.setAngleStart(270 - radius); 086 shape.setAngleExtent(2 * radius); 087 088 Area s = new Area(shape); 089 090 if ((rotate != null) && (angle != 0)) { 091 /// we have rotation houston, please spin me 092 getTransform().setToRotation(angle, rotate.getX(), rotate.getY()); 093 s.transform(getTransform()); 094 } 095 096 defaultDisplay(g2, s); 097 } 098 099 /** 100 * Tests another object for equality with this object. 101 * 102 * @param obj the object to test (<code>null</code> permitted). 103 * 104 * @return A boolean. 105 */ 106 public boolean equals(Object obj) { 107 if (obj == this) { 108 return true; 109 } 110 if (!(obj instanceof PlumNeedle)) { 111 return false; 112 } 113 if (!super.equals(obj)) { 114 return false; 115 } 116 return true; 117 } 118 119 /** 120 * Returns a clone of this needle. 121 * 122 * @return A clone. 123 * 124 * @throws CloneNotSupportedException if the <code>PlumNeedle</code> 125 * cannot be cloned (in theory, this should not happen). 126 */ 127 public Object clone() throws CloneNotSupportedException { 128 return super.clone(); 129 } 130 131 }