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 * LineNeedle.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: LineNeedle.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.Shape; 051 import java.awt.geom.Line2D; 052 import java.awt.geom.Point2D; 053 import java.awt.geom.Rectangle2D; 054 import java.io.Serializable; 055 056 /** 057 * A needle that is represented by a line. 058 */ 059 public class LineNeedle extends MeterNeedle 060 implements Cloneable, Serializable { 061 062 /** For serialization. */ 063 private static final long serialVersionUID = 6215321387896748945L; 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 Line2D shape = new Line2D.Double(); 077 078 double x = plotArea.getMinX() + (plotArea.getWidth() / 2); 079 shape.setLine(x, plotArea.getMinY(), x, plotArea.getMaxY()); 080 081 Shape s = shape; 082 083 if ((rotate != null) && (angle != 0)) { 084 /// we have rotation 085 getTransform().setToRotation(angle, rotate.getX(), rotate.getY()); 086 s = getTransform().createTransformedShape(s); 087 } 088 089 defaultDisplay(g2, s); 090 091 } 092 093 /** 094 * Tests another object for equality with this object. 095 * 096 * @param obj the object to test (<code>null</code> permitted). 097 * 098 * @return A boolean. 099 */ 100 public boolean equals(Object obj) { 101 if (obj == this) { 102 return true; 103 } 104 if (!(obj instanceof LineNeedle)) { 105 return false; 106 } 107 if (!super.equals(obj)) { 108 return false; 109 } 110 return true; 111 } 112 113 /** 114 * Returns a clone of this needle. 115 * 116 * @return A clone. 117 * 118 * @throws CloneNotSupportedException if the <code>LineNeedle</code> 119 * cannot be cloned (in theory, this should not happen). 120 */ 121 public Object clone() throws CloneNotSupportedException { 122 return super.clone(); 123 } 124 125 } 126