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