SampleXYDataset2


1   /* ======================================
2    * JFreeChart : a free Java chart library
3    * ======================================
4    *
5    * Project Info:  http://www.jfree.org/jfreechart/index.html
6    * Project Lead:  David Gilbert (david.gilbert@object-refinery.com);
7    *
8    * (C) Copyright 2000-2003, Object Refinery Limited and Contributors.
9    *
10   * This library is free software; you can redistribute it and/or modify it under the terms
11   * of the GNU Lesser General Public License as published by the Free Software Foundation;
12   * either version 2.1 of the License, or (at your option) any later version.
13   *
14   * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
15   * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
16   * See the GNU Lesser General Public License for more details.
17   *
18   * You should have received a copy of the GNU Lesser General Public License along with this
19   * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
20   * Boston, MA 02111-1307, USA.
21   *
22   * ---------------------
23   * SampleXYDataset2.java
24   * ---------------------
25   * (C) Copyright 2000-2003, by Object Refinery Limited.
26   *
27   * Original Author:  David Gilbert (for Object Refinery Limited);
28   * Contributor(s):   -;
29   *
30   * $Id: SampleXYDataset2.java,v 1.2 2003/05/29 15:23:34 mungady Exp $
31   *
32   * Changes
33   * -------
34   * 22-Oct-2001 : Version 1 (DG);
35   *               Renamed DataSource.java --> Dataset.java etc. (DG);
36   * 07-Nov-2001 : Updated source header (DG);
37   * 11-Oct-2002 : Fixed errors reported by Checkstyle (DG);
38   * 29-Oct-2002 : Modified so that you can specify dataset parameters in the constructor (DG);
39   *
40   */
41  
42  package org.jfree.chart.demo;
43  
44  import org.jfree.data.AbstractSeriesDataset;
45  import org.jfree.data.DomainInfo;
46  import org.jfree.data.Range;
47  import org.jfree.data.RangeInfo;
48  import org.jfree.data.XYDataset;
49  
50  /**
51   * Random data for a scatter plot demo.
52   * <P>
53   * Note that the aim of this class is to create a self-contained data source for demo purposes -
54   * it is NOT intended to show how you should go about writing your own datasets.
55   *
56   * @author David Gilbert
57   */
58  public class SampleXYDataset2 extends AbstractSeriesDataset implements XYDataset,
59                                                                         DomainInfo, RangeInfo {
60  
61      /** The series count. */
62      private static final int DEFAULT_SERIES_COUNT = 4;
63  
64      /** The item count. */
65      private static final int DEFAULT_ITEM_COUNT = 100;
66  
67      /** The range. */
68      private static final double DEFAULT_RANGE = 200;
69  
70      /** The x values. */
71      private Double  [][] xValues;
72  
73      /** The y values. */
74      private Double  [][] yValues;
75  
76      /** The number of series. */
77      private int seriesCount;
78  
79      /** The number of items. */
80      private int itemCount;
81  
82      /** The minimum domain value. */
83      private Number   domainMin;
84  
85      /** The maximum domain value. */
86      private Number   domainMax;
87  
88      /** The minimum range value. */
89      private Number   rangeMin;
90  
91      /** The maximum range value. */
92      private Number   rangeMax;
93  
94      /** The range of the domain. */
95      private Range domainRange;
96  
97      /** The range. */
98      private Range range;
99  
100     /**
101      * Creates a sample dataset using default settings (4 series, 100 data items per series,
102      * random data in the range 0 - 200).
103      */
104     public SampleXYDataset2() {
105         this(DEFAULT_SERIES_COUNT, DEFAULT_ITEM_COUNT);
106     }
107 
108     /**
109      * Creates a sample dataset.
110      *
111      * @param seriesCount  the number of series.
112      * @param itemCount  the number of items.
113      */
114     public SampleXYDataset2(int seriesCount, int itemCount) {
115 
116         this.xValues = new Double  [seriesCount][itemCount];
117         this.yValues = new Double  [seriesCount][itemCount];
118         this.seriesCount = seriesCount;
119         this.itemCount = itemCount;
120 
121         double minX = Double.POSITIVE_INFINITY;
122         double maxX = Double.NEGATIVE_INFINITY;
123         double minY = Double.POSITIVE_INFINITY;
124         double maxY = Double.NEGATIVE_INFINITY;
125 
126         for (int series = 0; series < seriesCount; series++) {
127             for (int item = 0; item < itemCount; item++) {
128 
129                 double x = (Math.random() - 0.5) * DEFAULT_RANGE;
130                 xValues[series][item] = new Double  (x);
131                 if (x < minX) {
132                     minX = x;
133                 }
134                 if (x > maxX) {
135                     maxX = x;
136                 }
137 
138                 double y = (Math.random() + 0.5) * 6 * x + x;
139                 yValues[series][item] = new Double  (y);
140                 if (y < minY) {
141                     minY = y;
142                 }
143                 if (y > maxY) {
144                     maxY = y;
145                 }
146 
147             }
148         }
149 
150         this.domainMin = new Double  (minX);
151         this.domainMax = new Double  (maxX);
152         this.domainRange = new Range(minX, maxX);
153 
154         this.rangeMin = new Double  (minY);
155         this.rangeMax = new Double  (maxY);
156         this.range = new Range(minY, maxY);
157 
158     }
159 
160     /**
161      * Returns the x-value for the specified series and item.  Series are numbered 0, 1, ...
162      *
163      * @param series  the index (zero-based) of the series.
164      * @param item  the index (zero-based) of the required item.
165      *
166      * @return the x-value for the specified series and item.
167      */
168     public Number   getXValue(int series, int item) {
169         return xValues[series][item];
170     }
171 
172     /**
173      * Returns the y-value for the specified series and item.  Series are numbered 0, 1, ...
174      *
175      * @param series  the index (zero-based) of the series.
176      * @param item  the index (zero-based) of the required item.
177      *
178      * @return  the y-value for the specified series and item.
179      */
180     public Number   getYValue(int series, int item) {
181         return yValues[series][item];
182     }
183 
184     /**
185      * Returns the number of series in the dataset.
186      *
187      * @return the series count.
188      */
189     public int getSeriesCount() {
190         return this.seriesCount;
191     }
192 
193     /**
194      * Returns the name of the series.
195      *
196      * @param series  the index (zero-based) of the series.
197      *
198      * @return the name of the series.
199      */
200     public String   getSeriesName(int series) {
201         return "Sample " + series;
202     }
203 
204     /**
205      * Returns the number of items in the specified series.
206      *
207      * @param series  the index (zero-based) of the series.
208      *
209      * @return the number of items in the specified series.
210      */
211     public int getItemCount(int series) {
212         return this.itemCount;
213     }
214 
215     /**
216      * Returns the minimum domain value.
217      *
218      * @return the minimum domain value.
219      */
220     public Number   getMinimumDomainValue() {
221         return this.domainMin;
222     }
223 
224     /**
225      * Returns the maximum domain value.
226      *
227      * @return the maximum domain value.
228      */
229     public Number   getMaximumDomainValue() {
230         return this.domainMax;
231     }
232 
233     /**
234      * Returns the range of values in the domain.
235      *
236      * @return the range.
237      */
238     public Range getDomainRange() {
239         return this.domainRange;
240     }
241 
242     /**
243      * Returns the minimum range value.
244      *
245      * @return the minimum range value.
246      */
247     public Number   getMinimumRangeValue() {
248         return this.rangeMin;
249     }
250 
251     /**
252      * Returns the maximum range value.
253      *
254      * @return the maximum range value.
255      */
256     public Number   getMaximumRangeValue() {
257         return this.rangeMax;
258     }
259 
260     /**
261      * Returns the range of values in the range (y-values).
262      *
263      * @return the range.
264      */
265     public Range getValueRange() {
266         return this.range;
267     }
268 
269 }
270
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