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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: * ArrowNeedle.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 : Added hashCode() implementation (DG); 43: * 44: */ 45: 46: package org.jfree.chart.needle; 47: 48: import java.awt.Graphics2D; 49: import java.awt.Shape; 50: import java.awt.geom.GeneralPath; 51: import java.awt.geom.Line2D; 52: import java.awt.geom.Point2D; 53: import java.awt.geom.Rectangle2D; 54: import java.io.Serializable; 55: 56: import org.jfree.chart.HashUtilities; 57: 58: /** 59: * A needle in the shape of an arrow. 60: */ 61: public class ArrowNeedle extends MeterNeedle 62: implements Cloneable, Serializable { 63: 64: /** For serialization. */ 65: private static final long serialVersionUID = -5334056511213782357L; 66: 67: /** 68: * A flag controlling whether or not there is an arrow at the top of the 69: * needle. 70: */ 71: private boolean isArrowAtTop = true; 72: 73: /** 74: * Constructs a new arrow needle. 75: * 76: * @param isArrowAtTop a flag that controls whether or not there is an 77: * arrow at the top of the needle. 78: */ 79: public ArrowNeedle(boolean isArrowAtTop) { 80: this.isArrowAtTop = isArrowAtTop; 81: } 82: 83: /** 84: * Draws the needle. 85: * 86: * @param g2 the graphics device. 87: * @param plotArea the plot area. 88: * @param rotate the rotation point. 89: * @param angle the angle. 90: */ 91: protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea, 92: Point2D rotate, double angle) { 93: 94: Line2D shape = new Line2D.Float(); 95: Shape d = null; 96: 97: float x = (float) (plotArea.getMinX() + (plotArea.getWidth() / 2)); 98: float minY = (float) plotArea.getMinY(); 99: float maxY = (float) plotArea.getMaxY(); 100: shape.setLine(x, minY, x, maxY); 101: 102: GeneralPath shape1 = new GeneralPath(); 103: if (this.isArrowAtTop) { 104: shape1.moveTo(x, minY); 105: minY += 4 * getSize(); 106: } 107: else { 108: shape1.moveTo(x, maxY); 109: minY = maxY - 4 * getSize(); 110: } 111: shape1.lineTo(x + getSize(), minY); 112: shape1.lineTo(x - getSize(), minY); 113: shape1.closePath(); 114: 115: if ((rotate != null) && (angle != 0)) { 116: getTransform().setToRotation(angle, rotate.getX(), rotate.getY()); 117: d = getTransform().createTransformedShape(shape); 118: } 119: else { 120: d = shape; 121: } 122: defaultDisplay(g2, d); 123: 124: if ((rotate != null) && (angle != 0)) { 125: d = getTransform().createTransformedShape(shape1); 126: } 127: else { 128: d = shape1; 129: } 130: defaultDisplay(g2, d); 131: 132: } 133: 134: /** 135: * Tests another object for equality with this object. 136: * 137: * @param obj the object to test (<code>null</code> permitted). 138: * 139: * @return A boolean. 140: */ 141: public boolean equals(Object obj) { 142: if (obj == this) { 143: return true; 144: } 145: if (!(obj instanceof ArrowNeedle)) { 146: return false; 147: } 148: if (!super.equals(obj)) { 149: return false; 150: } 151: ArrowNeedle that = (ArrowNeedle) obj; 152: if (this.isArrowAtTop != that.isArrowAtTop) { 153: return false; 154: } 155: return true; 156: } 157: 158: /** 159: * Returns a hash code for this instance. 160: * 161: * @return A hash code. 162: */ 163: public int hashCode() { 164: int result = super.hashCode(); 165: result = HashUtilities.hashCode(result, this.isArrowAtTop); 166: return result; 167: } 168: 169: /** 170: * Returns a clone of this needle. 171: * 172: * @return A clone. 173: * 174: * @throws CloneNotSupportedException if the <code>ArrowNeedle</code> 175: * cannot be cloned (in theory, this should not happen). 176: */ 177: public Object clone() throws CloneNotSupportedException { 178: return super.clone(); 179: } 180: 181: }