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:  *
  41:  */
  42: 
  43: package org.jfree.chart.needle;
  44: 
  45: import java.awt.Graphics2D;
  46: import java.awt.geom.Point2D;
  47: import java.awt.geom.Rectangle2D;
  48: import java.io.Serializable;
  49: 
  50: /**
  51:  * A needle that indicates wind direction, for use with the
  52:  * {@link org.jfree.chart.plot.CompassPlot} class.
  53:  */
  54: public class WindNeedle extends ArrowNeedle 
  55:                                 implements Cloneable, Serializable {
  56: 
  57:     /** For serialization. */
  58:     private static final long serialVersionUID = -2861061368907167834L;
  59:     
  60:     /**
  61:      * Default constructor.
  62:      */
  63:     public WindNeedle() {
  64:         super(false);  // isArrowAtTop
  65:     }
  66: 
  67:     /**
  68:      * Draws the needle.
  69:      *
  70:      * @param g2  the graphics device.
  71:      * @param plotArea  the plot area.
  72:      * @param rotate  the rotation point.
  73:      * @param angle  the angle.
  74:      */
  75:     protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea, 
  76:                               Point2D rotate, double angle) {
  77: 
  78:         super.drawNeedle(g2, plotArea, rotate, angle);
  79:         if ((rotate != null) && (plotArea != null)) {
  80: 
  81:             int spacing = getSize() * 3;
  82:             Rectangle2D newArea = new Rectangle2D.Double();
  83: 
  84:             Point2D newRotate = rotate;
  85:             newArea.setRect(plotArea.getMinX() - spacing, plotArea.getMinY(),
  86:                     plotArea.getWidth(), plotArea.getHeight());
  87:             super.drawNeedle(g2, newArea, newRotate, angle);
  88: 
  89:             newArea.setRect(plotArea.getMinX() + spacing, 
  90:                     plotArea.getMinY(), plotArea.getWidth(), 
  91:                     plotArea.getHeight());
  92:             super.drawNeedle(g2, newArea, newRotate, angle);
  93: 
  94:         }
  95:     }
  96: 
  97:     /**
  98:      * Tests another object for equality with this object.
  99:      * 
 100:      * @param object  the object to test.
 101:      * 
 102:      * @return A boolean.
 103:      */
 104:     public boolean equals(Object object) {
 105:         if (object == null) {
 106:             return false;
 107:         }
 108:         if (object == this) {
 109:             return true;
 110:         }
 111:         if (super.equals(object) && object instanceof WindNeedle) {
 112:             return true;
 113:         }
 114:         return false;
 115:     }
 116: 
 117: }
 118: