Frames | No Frames |
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: * 22-Nov-2007 : Implemented hashCode() (DG); 43: * 44: */ 45: 46: package org.jfree.chart.needle; 47: 48: import java.awt.Graphics2D; 49: import java.awt.geom.Arc2D; 50: import java.awt.geom.Area; 51: import java.awt.geom.Point2D; 52: import java.awt.geom.Rectangle2D; 53: import java.io.Serializable; 54: 55: /** 56: * A needle for use with the {@link org.jfree.chart.plot.CompassPlot} class. 57: */ 58: public class PlumNeedle extends MeterNeedle 59: implements Cloneable, Serializable { 60: 61: /** For serialization. */ 62: private static final long serialVersionUID = -3082660488660600718L; 63: 64: /** 65: * Draws the needle. 66: * 67: * @param g2 the graphics device. 68: * @param plotArea the plot area. 69: * @param rotate the rotation point. 70: * @param angle the angle. 71: */ 72: protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea, 73: Point2D rotate, double angle) { 74: 75: Arc2D shape = new Arc2D.Double(Arc2D.PIE); 76: double radius = plotArea.getHeight(); 77: double halfX = plotArea.getWidth() / 2; 78: double diameter = 2 * radius; 79: 80: shape.setFrame(plotArea.getMinX() + halfX - radius , 81: plotArea.getMinY() - radius, 82: diameter, diameter); 83: radius = Math.toDegrees(Math.asin(halfX / radius)); 84: shape.setAngleStart(270 - radius); 85: shape.setAngleExtent(2 * radius); 86: 87: Area s = new Area(shape); 88: 89: if ((rotate != null) && (angle != 0)) { 90: /// we have rotation houston, please spin me 91: getTransform().setToRotation(angle, rotate.getX(), rotate.getY()); 92: s.transform(getTransform()); 93: } 94: 95: defaultDisplay(g2, s); 96: } 97: 98: /** 99: * Tests another object for equality with this object. 100: * 101: * @param obj the object to test (<code>null</code> permitted). 102: * 103: * @return A boolean. 104: */ 105: public boolean equals(Object obj) { 106: if (obj == this) { 107: return true; 108: } 109: if (!(obj instanceof PlumNeedle)) { 110: return false; 111: } 112: if (!super.equals(obj)) { 113: return false; 114: } 115: return true; 116: } 117: 118: /** 119: * Returns a hash code for this instance. 120: * 121: * @return A hash code. 122: */ 123: public int hashCode() { 124: return super.hashCode(); 125: } 126: 127: /** 128: * Returns a clone of this needle. 129: * 130: * @return A clone. 131: * 132: * @throws CloneNotSupportedException if the <code>PlumNeedle</code> 133: * cannot be cloned (in theory, this should not happen). 134: */ 135: public Object clone() throws CloneNotSupportedException { 136: return super.clone(); 137: } 138: 139: }