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 * PointerNeedle.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: PointerNeedle.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 * 26-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.GeneralPath; 051 import java.awt.geom.Point2D; 052 import java.awt.geom.Rectangle2D; 053 import java.io.Serializable; 054 055 /** 056 * A needle in the shape of a pointer, for use with the 057 * {@link org.jfree.chart.plot.CompassPlot} class. 058 */ 059 public class PointerNeedle extends MeterNeedle 060 implements Cloneable, Serializable { 061 062 /** For serialization. */ 063 private static final long serialVersionUID = -4744677345334729606L; 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 GeneralPath shape1 = new GeneralPath(); 077 GeneralPath shape2 = new GeneralPath(); 078 float minX = (float) plotArea.getMinX(); 079 float minY = (float) plotArea.getMinY(); 080 float maxX = (float) plotArea.getMaxX(); 081 float maxY = (float) plotArea.getMaxY(); 082 float midX = (float) (minX + (plotArea.getWidth() / 2)); 083 float midY = (float) (minY + (plotArea.getHeight() / 2)); 084 085 shape1.moveTo(minX, midY); 086 shape1.lineTo(midX, minY); 087 shape1.lineTo(maxX, midY); 088 shape1.closePath(); 089 090 shape2.moveTo(minX, midY); 091 shape2.lineTo(midX, maxY); 092 shape2.lineTo(maxX, midY); 093 shape2.closePath(); 094 095 if ((rotate != null) && (angle != 0)) { 096 /// we have rotation huston, please spin me 097 getTransform().setToRotation(angle, rotate.getX(), rotate.getY()); 098 shape1.transform(getTransform()); 099 shape2.transform(getTransform()); 100 } 101 102 if (getFillPaint() != null) { 103 g2.setPaint(getFillPaint()); 104 g2.fill(shape1); 105 } 106 107 if (getHighlightPaint() != null) { 108 g2.setPaint(getHighlightPaint()); 109 g2.fill(shape2); 110 } 111 112 if (getOutlinePaint() != null) { 113 g2.setStroke(getOutlineStroke()); 114 g2.setPaint(getOutlinePaint()); 115 g2.draw(shape1); 116 g2.draw(shape2); 117 } 118 } 119 120 /** 121 * Tests another object for equality with this object. 122 * 123 * @param obj the object to test (<code>null</code> permitted). 124 * 125 * @return A boolean. 126 */ 127 public boolean equals(Object obj) { 128 if (obj == this) { 129 return true; 130 } 131 if (!(obj instanceof PointerNeedle)) { 132 return false; 133 } 134 if (!super.equals(obj)) { 135 return false; 136 } 137 return true; 138 } 139 140 /** 141 * Returns a clone of this needle. 142 * 143 * @return A clone. 144 * 145 * @throws CloneNotSupportedException if the <code>PointerNeedle</code> 146 * cannot be cloned (in theory, this should not happen). 147 */ 148 public Object clone() throws CloneNotSupportedException { 149 return super.clone(); 150 } 151 152 }