Source for org.jfree.chart.plot.ValueMarker

   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:  * ValueMarker.java
  29:  * ----------------
  30:  * (C) Copyright 2004, 2006, by Object Refinery Limited.
  31:  *
  32:  * Original Author:  David Gilbert (for Object Refinery Limited);
  33:  * Contributor(s):   -;
  34:  *
  35:  * $Id: ValueMarker.java,v 1.3.2.3 2006/10/25 17:03:10 mungady Exp $
  36:  *
  37:  * Changes
  38:  * -------
  39:  * 09-Feb-2004 : Version 1 (DG);
  40:  * 16-Feb-2005 : Added new constructor (DG);
  41:  * ------------- JFREECHART 1.0.x ---------------------------------------------
  42:  * 05-Sep-2006 : Added setValue() method (DG);
  43:  * 
  44:  */
  45: 
  46: package org.jfree.chart.plot;
  47: 
  48: import java.awt.Paint;
  49: import java.awt.Stroke;
  50: 
  51: import org.jfree.chart.event.MarkerChangeEvent;
  52: 
  53: /**
  54:  * A marker that represents a single value.  Markers can be added to plots to
  55:  * highlight specific values.
  56:  */
  57: public class ValueMarker extends Marker {
  58:     
  59:     /** The value. */
  60:     private double value;
  61: 
  62:     /**
  63:      * Creates a new marker.
  64:      * 
  65:      * @param value  the value.
  66:      */
  67:     public ValueMarker(double value) {
  68:         super();
  69:         this.value = value;
  70:     }
  71:     
  72:     /**
  73:      * Creates a new marker.
  74:      * 
  75:      * @param value  the value.
  76:      * @param paint  the paint (<code>null</code> not permitted).
  77:      * @param stroke  the stroke (<code>null</code> not permitted).
  78:      */
  79:     public ValueMarker(double value, Paint paint, Stroke stroke) {
  80:         this(value, paint, stroke, paint, stroke, 1.0f);
  81:     }
  82:     
  83:     /**
  84:      * Creates a new value marker.
  85:      * 
  86:      * @param value  the value.
  87:      * @param paint  the paint (<code>null</code> not permitted).
  88:      * @param stroke  the stroke (<code>null</code> not permitted).
  89:      * @param outlinePaint  the outline paint (<code>null</code> permitted).
  90:      * @param outlineStroke  the outline stroke (<code>null</code> permitted).
  91:      * @param alpha  the alpha transparency.
  92:      */
  93:     public ValueMarker(double value, Paint paint, Stroke stroke, 
  94:                        Paint outlinePaint, Stroke outlineStroke, float alpha) {
  95:         super(paint, stroke, paint, stroke, alpha);
  96:         this.value = value;
  97:     }
  98:     
  99:     /**
 100:      * Returns the value.
 101:      *
 102:      * @return The value.
 103:      */
 104:     public double getValue() {
 105:         return this.value;
 106:     }
 107:     
 108:     /**
 109:      * Sets the value for the marker and sends a {@link MarkerChangeEvent} to 
 110:      * all registered listeners.
 111:      * 
 112:      * @param value  the value.
 113:      * 
 114:      * @since 1.0.3
 115:      */
 116:     public void setValue(double value) { 
 117:         this.value = value;
 118:         notifyListeners(new MarkerChangeEvent(this));
 119:     }
 120: 
 121:     /**
 122:      * Tests this marker for equality with an arbitrary object.  This method
 123:      * returns <code>true</code> if:
 124:      * 
 125:      * <ul>
 126:      * <li><code>obj</code> is not <code>null</code>;</li>
 127:      * <li><code>obj</code> is an instance of <code>ValueMarker</code>;</li>
 128:      * <li><code>obj</code> has the same value as this marker;</li>
 129:      * <li><code>super.equals(obj)</code> returns <code>true</code>.</li>
 130:      * </ul>
 131:      * 
 132:      * @param obj  the object (<code>null</code> permitted).
 133:      * 
 134:      * @return A boolean.
 135:      */
 136:     public boolean equals(Object obj) {
 137:         if (obj == this) {
 138:             return true;
 139:         }
 140:         if (!super.equals(obj)) {
 141:             return false;
 142:         }
 143:         if (!(obj instanceof ValueMarker)) {
 144:             return false;
 145:         }
 146:         ValueMarker that = (ValueMarker) obj;
 147:         if (this.value != that.value) {
 148:             return false;
 149:         }
 150:         return true;
 151:     }
 152: }