Source for org.jfree.chart.needle.WindNeedle

   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:  * WindNeedle.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:  * 09-Sep-2003 : Added equals() method (DG);
  40:  * 22-Nov-2007 : Implemented hashCode() (DG)
  41:  *
  42:  */
  43: 
  44: package org.jfree.chart.needle;
  45: 
  46: import java.awt.Graphics2D;
  47: import java.awt.geom.Point2D;
  48: import java.awt.geom.Rectangle2D;
  49: import java.io.Serializable;
  50: 
  51: /**
  52:  * A needle that indicates wind direction, for use with the
  53:  * {@link org.jfree.chart.plot.CompassPlot} class.
  54:  */
  55: public class WindNeedle extends ArrowNeedle 
  56:                                 implements Cloneable, Serializable {
  57: 
  58:     /** For serialization. */
  59:     private static final long serialVersionUID = -2861061368907167834L;
  60:     
  61:     /**
  62:      * Default constructor.
  63:      */
  64:     public WindNeedle() {
  65:         super(false);  // isArrowAtTop
  66:     }
  67: 
  68:     /**
  69:      * Draws the needle.
  70:      *
  71:      * @param g2  the graphics device.
  72:      * @param plotArea  the plot area.
  73:      * @param rotate  the rotation point.
  74:      * @param angle  the angle.
  75:      */
  76:     protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea, 
  77:                               Point2D rotate, double angle) {
  78: 
  79:         super.drawNeedle(g2, plotArea, rotate, angle);
  80:         if ((rotate != null) && (plotArea != null)) {
  81: 
  82:             int spacing = getSize() * 3;
  83:             Rectangle2D newArea = new Rectangle2D.Double();
  84: 
  85:             Point2D newRotate = rotate;
  86:             newArea.setRect(plotArea.getMinX() - spacing, plotArea.getMinY(),
  87:                     plotArea.getWidth(), plotArea.getHeight());
  88:             super.drawNeedle(g2, newArea, newRotate, angle);
  89: 
  90:             newArea.setRect(plotArea.getMinX() + spacing, 
  91:                     plotArea.getMinY(), plotArea.getWidth(), 
  92:                     plotArea.getHeight());
  93:             super.drawNeedle(g2, newArea, newRotate, angle);
  94: 
  95:         }
  96:     }
  97: 
  98:     /**
  99:      * Tests another object for equality with this object.
 100:      * 
 101:      * @param object  the object to test.
 102:      * 
 103:      * @return A boolean.
 104:      */
 105:     public boolean equals(Object object) {
 106:         if (object == null) {
 107:             return false;
 108:         }
 109:         if (object == this) {
 110:             return true;
 111:         }
 112:         if (super.equals(object) && object instanceof WindNeedle) {
 113:             return true;
 114:         }
 115:         return false;
 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: