Source for org.jfree.chart.needle.LineNeedle

   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:  * LineNeedle.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 : Added hashCode() implementation (DG);
  43:  *
  44:  */
  45: 
  46: package org.jfree.chart.needle;
  47: 
  48: import java.awt.Graphics2D;
  49: import java.awt.Shape;
  50: import java.awt.geom.Line2D;
  51: import java.awt.geom.Point2D;
  52: import java.awt.geom.Rectangle2D;
  53: import java.io.Serializable;
  54: 
  55: /**
  56:  * A needle that is represented by a line.
  57:  */
  58: public class LineNeedle extends MeterNeedle 
  59:                         implements Cloneable, Serializable {
  60: 
  61:     /** For serialization. */
  62:     private static final long serialVersionUID = 6215321387896748945L;
  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:         Line2D shape = new Line2D.Double();
  76: 
  77:         double x = plotArea.getMinX() + (plotArea.getWidth() / 2);
  78:         shape.setLine(x, plotArea.getMinY(), x, plotArea.getMaxY());
  79: 
  80:         Shape s = shape;
  81: 
  82:         if ((rotate != null) && (angle != 0)) {
  83:             /// we have rotation
  84:             getTransform().setToRotation(angle, rotate.getX(), rotate.getY());
  85:             s = getTransform().createTransformedShape(s);
  86:         }
  87: 
  88:         defaultDisplay(g2, s);
  89: 
  90:     }
  91:     
  92:     /**
  93:      * Tests another object for equality with this object.
  94:      * 
  95:      * @param obj  the object to test (<code>null</code> permitted).
  96:      * 
  97:      * @return A boolean.
  98:      */
  99:     public boolean equals(Object obj) {
 100:         if (obj == this) {
 101:             return true;
 102:         }
 103:         if (!(obj instanceof LineNeedle)) {
 104:             return false;   
 105:         }
 106:         return super.equals(obj);
 107:     }
 108:     
 109:     /**
 110:      * Returns a hash code for this instance.
 111:      * 
 112:      * @return A hash code.
 113:      */
 114:     public int hashCode() {
 115:         return super.hashCode(); 
 116:     }
 117: 
 118:     /**
 119:      * Returns a clone of this needle.
 120:      * 
 121:      * @return A clone.
 122:      * 
 123:      * @throws CloneNotSupportedException if the <code>LineNeedle</code> 
 124:      *     cannot be cloned (in theory, this should not happen).
 125:      */
 126:     public Object clone() throws CloneNotSupportedException {
 127:         return super.clone();   
 128:     }
 129:     
 130: }
 131: