Source for org.jfree.chart.needle.MiddlePinNeedle

   1: /* ===========================================================
   2:  * JFreeChart : a free chart library for the Java(tm) platform
   3:  * ===========================================================
   4:  *
   5:  * (C) Copyright 2000-2006, 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:  * PinNeedle.java
  29:  * --------------
  30:  * (C) Copyright 2002-2006, 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:  * $Id: MiddlePinNeedle.java,v 1.4.2.3 2006/08/02 10:40:57 mungady Exp $
  37:  *
  38:  * Changes:
  39:  * --------
  40:  * 25-Sep-2002 : Version 1, contributed by Bryan Scott (DG);
  41:  * 27-Mar-2003 : Implemented Serializable (DG);
  42:  * 09-Sep-2003 : Added equals() method (DG);
  43:  * 08-Jun-2005 : Implemented Cloneable (DG);
  44:  * 
  45:  */
  46: 
  47: package org.jfree.chart.needle;
  48: 
  49: import java.awt.Graphics2D;
  50: import java.awt.geom.Area;
  51: import java.awt.geom.Ellipse2D;
  52: import java.awt.geom.GeneralPath;
  53: import java.awt.geom.Point2D;
  54: import java.awt.geom.Rectangle2D;
  55: import java.io.Serializable;
  56: 
  57: /**
  58:  * A needle that is drawn as a pin shape.
  59:  */
  60: public class MiddlePinNeedle extends MeterNeedle 
  61:                              implements Cloneable, Serializable {
  62: 
  63:     /** For serialization. */
  64:     private static final long serialVersionUID = 6237073996403125310L;
  65:     
  66:     /**
  67:      * Draws the needle.
  68:      *
  69:      * @param g2  the graphics device.
  70:      * @param plotArea  the plot area.
  71:      * @param rotate  the rotation point.
  72:      * @param angle  the angle.
  73:      */
  74:     protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea, 
  75:                               Point2D rotate, double angle) {
  76: 
  77:         Area shape;
  78:         GeneralPath pointer = new GeneralPath();
  79: 
  80:         int minY = (int) (plotArea.getMinY());
  81:         //int maxX = (int) (plotArea.getMaxX());
  82:         int maxY = (int) (plotArea.getMaxY());
  83:         int midY = ((maxY - minY) / 2) + minY;
  84: 
  85:         int midX = (int) (plotArea.getMinX() + (plotArea.getWidth() / 2));
  86:         //int midY = (int) (plotArea.getMinY() + (plotArea.getHeight() / 2));
  87:         int lenX = (int) (plotArea.getWidth() / 10);
  88:         if (lenX < 2) {
  89:             lenX = 2;
  90:         }
  91: 
  92:         pointer.moveTo(midX - lenX, midY - lenX);
  93:         pointer.lineTo(midX + lenX, midY - lenX);
  94:         pointer.lineTo(midX, minY);
  95:         pointer.closePath();
  96: 
  97:         lenX = 4 * lenX;
  98:         Ellipse2D circle = new Ellipse2D.Double(midX - lenX / 2,
  99:                                                 midY - lenX, lenX, lenX);
 100: 
 101:         shape = new Area(circle);
 102:         shape.add(new Area(pointer));
 103:         if ((rotate != null) && (angle != 0)) {
 104:             /// we have rotation
 105:             getTransform().setToRotation(angle, rotate.getX(), rotate.getY());
 106:             shape.transform(getTransform());
 107:         }
 108: 
 109:         defaultDisplay(g2, shape);
 110: 
 111:     }
 112: 
 113:     /**
 114:      * Tests another object for equality with this object.
 115:      *
 116:      * @param object  the object to test.
 117:      *
 118:      * @return A boolean.
 119:      */
 120:     public boolean equals(Object object) {
 121:         if (object == null) {
 122:             return false;
 123:         }
 124:         if (object == this) {
 125:             return true;
 126:         }
 127:         if (super.equals(object) && object instanceof MiddlePinNeedle) {
 128:             return true;
 129:         }
 130:         return false;
 131:     }
 132:     
 133:     /**
 134:      * Returns a clone of this needle.
 135:      * 
 136:      * @return A clone.
 137:      * 
 138:      * @throws CloneNotSupportedException if the <code>MiddlePinNeedle</code> 
 139:      *     cannot be cloned (in theory, this should not happen).
 140:      */
 141:     public Object clone() throws CloneNotSupportedException {
 142:         return super.clone();   
 143:     }
 144: 
 145: }