001/* =========================================================== 002 * JFreeChart : a free chart library for the Java(tm) platform 003 * =========================================================== 004 * 005 * (C) Copyright 2000-2013, 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 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 025 * Other names may be trademarks of their respective owners.] 026 * 027 * ------------------ 028 * PointerNeedle.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 * 26-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 046package org.jfree.chart.needle; 047 048import java.awt.Graphics2D; 049import java.awt.geom.GeneralPath; 050import java.awt.geom.Point2D; 051import java.awt.geom.Rectangle2D; 052import java.io.Serializable; 053 054/** 055 * A needle in the shape of a pointer, for use with the 056 * {@link org.jfree.chart.plot.CompassPlot} class. 057 */ 058public class PointerNeedle extends MeterNeedle 059 implements Cloneable, Serializable { 060 061 /** For serialization. */ 062 private static final long serialVersionUID = -4744677345334729606L; 063 064 /** 065 * Draws the needle. 066 * 067 * @param g2 the graphics device. 068 * @param plotArea the plot area. 069 * @param rotate the rotation point. 070 * @param angle the angle. 071 */ 072 @Override 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 @Override 128 public boolean equals(Object obj) { 129 if (obj == this) { 130 return true; 131 } 132 if (!(obj instanceof PointerNeedle)) { 133 return false; 134 } 135 if (!super.equals(obj)) { 136 return false; 137 } 138 return true; 139 } 140 141 /** 142 * Returns a hash code for this instance. 143 * 144 * @return A hash code. 145 */ 146 @Override 147 public int hashCode() { 148 return super.hashCode(); 149 } 150 151 /** 152 * Returns a clone of this needle. 153 * 154 * @return A clone. 155 * 156 * @throws CloneNotSupportedException if the <code>PointerNeedle</code> 157 * cannot be cloned (in theory, this should not happen). 158 */ 159 @Override 160 public Object clone() throws CloneNotSupportedException { 161 return super.clone(); 162 } 163 164}