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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: * MiddlePinNeedle.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.Area; 50: import java.awt.geom.Ellipse2D; 51: import java.awt.geom.GeneralPath; 52: import java.awt.geom.Point2D; 53: import java.awt.geom.Rectangle2D; 54: import java.io.Serializable; 55: 56: /** 57: * A needle that is drawn as a pin shape. 58: */ 59: public class MiddlePinNeedle extends MeterNeedle 60: implements Cloneable, Serializable { 61: 62: /** For serialization. */ 63: private static final long serialVersionUID = 6237073996403125310L; 64: 65: /** 66: * Draws the needle. 67: * 68: * @param g2 the graphics device. 69: * @param plotArea the plot area. 70: * @param rotate the rotation point. 71: * @param angle the angle. 72: */ 73: protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea, 74: Point2D rotate, double angle) { 75: 76: Area shape; 77: GeneralPath pointer = new GeneralPath(); 78: 79: int minY = (int) (plotArea.getMinY()); 80: //int maxX = (int) (plotArea.getMaxX()); 81: int maxY = (int) (plotArea.getMaxY()); 82: int midY = ((maxY - minY) / 2) + minY; 83: 84: int midX = (int) (plotArea.getMinX() + (plotArea.getWidth() / 2)); 85: //int midY = (int) (plotArea.getMinY() + (plotArea.getHeight() / 2)); 86: int lenX = (int) (plotArea.getWidth() / 10); 87: if (lenX < 2) { 88: lenX = 2; 89: } 90: 91: pointer.moveTo(midX - lenX, midY - lenX); 92: pointer.lineTo(midX + lenX, midY - lenX); 93: pointer.lineTo(midX, minY); 94: pointer.closePath(); 95: 96: lenX = 4 * lenX; 97: Ellipse2D circle = new Ellipse2D.Double(midX - lenX / 2, 98: midY - lenX, lenX, lenX); 99: 100: shape = new Area(circle); 101: shape.add(new Area(pointer)); 102: if ((rotate != null) && (angle != 0)) { 103: /// we have rotation 104: getTransform().setToRotation(angle, rotate.getX(), rotate.getY()); 105: shape.transform(getTransform()); 106: } 107: 108: defaultDisplay(g2, shape); 109: 110: } 111: 112: /** 113: * Tests another object for equality with this object. 114: * 115: * @param object the object to test. 116: * 117: * @return A boolean. 118: */ 119: public boolean equals(Object object) { 120: if (object == null) { 121: return false; 122: } 123: if (object == this) { 124: return true; 125: } 126: if (super.equals(object) && object instanceof MiddlePinNeedle) { 127: return true; 128: } 129: return false; 130: } 131: 132: /** 133: * Returns a hash code for this instance. 134: * 135: * @return A hash code. 136: */ 137: public int hashCode() { 138: return super.hashCode(); 139: } 140: 141: /** 142: * Returns a clone of this needle. 143: * 144: * @return A clone. 145: * 146: * @throws CloneNotSupportedException if the <code>MiddlePinNeedle</code> 147: * cannot be cloned (in theory, this should not happen). 148: */ 149: public Object clone() throws CloneNotSupportedException { 150: return super.clone(); 151: } 152: 153: }