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1: /* =========================================================== 2: * JFreeChart : a free chart library for the Java(tm) platform 3: * =========================================================== 4: * 5: * (C) Copyright 2000-2007, by Object Refinery Limited and Contributors. 6: * 7: * Project Info: http://www.jfree.org/jfreechart/index.html 8: * 9: * This library is free software; you can redistribute it and/or modify it 10: * under the terms of the GNU Lesser General Public License as published by 11: * the Free Software Foundation; either version 2.1 of the License, or 12: * (at your option) any later version. 13: * 14: * This library is distributed in the hope that it will be useful, but 15: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 17: * License for more details. 18: * 19: * You should have received a copy of the GNU Lesser General Public 20: * License along with this library; if not, write to the Free Software 21: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 22: * USA. 23: * 24: * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 25: * in the United States and other countries.] 26: * 27: * --------------- 28: * PlumNeedle.java 29: * --------------- 30: * (C) Copyright 2002-2007, by the Australian Antarctic Division and 31: * Contributors. 32: * 33: * Original Author: Bryan Scott (for the Australian Antarctic Division); 34: * Contributor(s): David Gilbert (for Object Refinery Limited); 35: * 36: * Changes: 37: * -------- 38: * 25-Sep-2002 : Version 1, contributed by Bryan Scott (DG); 39: * 27-Mar-2003 : Implemented Serializable (DG); 40: * 09-Sep-2003 : Added equals() method (DG); 41: * 08-Jun-2005 : Implemented Cloneable (DG); 42: * 43: */ 44: 45: package org.jfree.chart.needle; 46: 47: import java.awt.Graphics2D; 48: import java.awt.geom.Arc2D; 49: import java.awt.geom.Area; 50: import java.awt.geom.Point2D; 51: import java.awt.geom.Rectangle2D; 52: import java.io.Serializable; 53: 54: /** 55: * A needle for use with the {@link org.jfree.chart.plot.CompassPlot} class. 56: */ 57: public class PlumNeedle extends MeterNeedle 58: implements Cloneable, Serializable { 59: 60: /** For serialization. */ 61: private static final long serialVersionUID = -3082660488660600718L; 62: 63: /** 64: * Draws the needle. 65: * 66: * @param g2 the graphics device. 67: * @param plotArea the plot area. 68: * @param rotate the rotation point. 69: * @param angle the angle. 70: */ 71: protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea, 72: Point2D rotate, double angle) { 73: 74: Arc2D shape = new Arc2D.Double(Arc2D.PIE); 75: double radius = plotArea.getHeight(); 76: double halfX = plotArea.getWidth() / 2; 77: double diameter = 2 * radius; 78: 79: shape.setFrame(plotArea.getMinX() + halfX - radius , 80: plotArea.getMinY() - radius, 81: diameter, diameter); 82: radius = Math.toDegrees(Math.asin(halfX / radius)); 83: shape.setAngleStart(270 - radius); 84: shape.setAngleExtent(2 * radius); 85: 86: Area s = new Area(shape); 87: 88: if ((rotate != null) && (angle != 0)) { 89: /// we have rotation houston, please spin me 90: getTransform().setToRotation(angle, rotate.getX(), rotate.getY()); 91: s.transform(getTransform()); 92: } 93: 94: defaultDisplay(g2, s); 95: } 96: 97: /** 98: * Tests another object for equality with this object. 99: * 100: * @param obj the object to test (<code>null</code> permitted). 101: * 102: * @return A boolean. 103: */ 104: public boolean equals(Object obj) { 105: if (obj == this) { 106: return true; 107: } 108: if (!(obj instanceof PlumNeedle)) { 109: return false; 110: } 111: if (!super.equals(obj)) { 112: return false; 113: } 114: return true; 115: } 116: 117: /** 118: * Returns a clone of this needle. 119: * 120: * @return A clone. 121: * 122: * @throws CloneNotSupportedException if the <code>PlumNeedle</code> 123: * cannot be cloned (in theory, this should not happen). 124: */ 125: public Object clone() throws CloneNotSupportedException { 126: return super.clone(); 127: } 128: 129: }