Source for org.jfree.chart.needle.PinNeedle

   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:  * PinNeedle.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: 
  45: package org.jfree.chart.needle;
  46: 
  47: import java.awt.Graphics2D;
  48: import java.awt.geom.Area;
  49: import java.awt.geom.Ellipse2D;
  50: import java.awt.geom.GeneralPath;
  51: import java.awt.geom.Point2D;
  52: import java.awt.geom.Rectangle2D;
  53: import java.io.Serializable;
  54: 
  55: /**
  56:  * A needle that is drawn as a pin shape.
  57:  */
  58: public class PinNeedle extends MeterNeedle 
  59:                        implements Cloneable, Serializable {
  60: 
  61:     /** For serialization. */
  62:     private static final long serialVersionUID = -3787089953079863373L;
  63:     
  64:     /**
  65:      * Draws the needle.
  66:      *
  67:      * @param g2  the graphics device.
  68:      * @param plotArea  the plot area.
  69:      * @param rotate  the rotation point.
  70:      * @param angle  the angle.
  71:      */
  72:     protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea, 
  73:                               Point2D rotate, double angle) {
  74: 
  75:         Area shape;
  76:         GeneralPath pointer = new GeneralPath();
  77: 
  78:         int minY = (int) (plotArea.getMinY());
  79:         //int maxX = (int) (plotArea.getMaxX());
  80:         int maxY = (int) (plotArea.getMaxY());
  81:         int midX = (int) (plotArea.getMinX() + (plotArea.getWidth() / 2));
  82:         //int midY = (int) (plotArea.getMinY() + (plotArea.getHeight() / 2));
  83:         int lenX = (int) (plotArea.getWidth() / 10);
  84:         if (lenX < 2) {
  85:             lenX = 2;
  86:         }
  87: 
  88:         pointer.moveTo(midX - lenX, maxY - lenX);
  89:         pointer.lineTo(midX + lenX, maxY - lenX);
  90:         pointer.lineTo(midX, minY + lenX);
  91:         pointer.closePath();
  92: 
  93:         lenX = 4 * lenX;
  94:         Ellipse2D circle = new Ellipse2D.Double(midX - lenX / 2, 
  95:                 plotArea.getMaxY() - lenX, lenX, lenX);
  96: 
  97:         shape = new Area(circle);
  98:         shape.add(new Area(pointer));
  99:         if ((rotate != null) && (angle != 0)) {
 100:             /// we have rotation
 101:             getTransform().setToRotation(angle, rotate.getX(), rotate.getY());
 102:             shape.transform(getTransform());
 103:         }
 104: 
 105:         defaultDisplay(g2, shape);
 106: 
 107:     }
 108: 
 109:     /**
 110:      * Tests another object for equality with this object.
 111:      * 
 112:      * @param obj  the object to test (<code>null</code> permitted).
 113:      * 
 114:      * @return A boolean.
 115:      */
 116:     public boolean equals(Object obj) {
 117:         if (obj == this) {
 118:             return true;
 119:         }
 120:         if (!(obj instanceof PinNeedle)) {
 121:             return false;   
 122:         }
 123:         if (!super.equals(obj)) {
 124:             return false;
 125:         }
 126:         return true;
 127:     }
 128:     
 129:     /**
 130:      * Returns a clone of this needle.
 131:      * 
 132:      * @return A clone.
 133:      * 
 134:      * @throws CloneNotSupportedException if the <code>PinNeedle</code> 
 135:      *     cannot be cloned (in theory, this should not happen).
 136:      */
 137:     public Object clone() throws CloneNotSupportedException {
 138:         return super.clone();   
 139:     }
 140: 
 141: }