Mercurial > dive4elements > gnv-client

comparison gnv-artifacts/src/main/java/de/intevation/gnv/chart/DefaultHistogram.java @ 657:af3f56758f59

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merged gnv-artifacts/0.5
author Thomas Arendsen Hein <thomas@intevation.de>
date Fri, 28 Sep 2012 12:13:53 +0200
parents d08b9ba148c5
children 79401c871da4
comparison
equal deleted inserted replaced
590:5f5f273c8566 657:af3f56758f59
1 package de.intevation.gnv.chart;
2
3 import java.text.NumberFormat;
4 import java.text.ParseException;
5 import java.util.Locale;
6 import java.util.Map;
7
8 import org.apache.log4j.Logger;
9
10 import org.jfree.chart.ChartTheme;
11
12 import org.jfree.chart.plot.XYPlot;
13
14 import org.jfree.data.statistics.HistogramDataset;
15
16 /**
17 * @author Ingo Weinzierl (ingo.weinzierl@intevation.de)
18 */
19 public class DefaultHistogram
20 extends AbstractHistogram
21 {
22 // TODO take a better default value
23 public static final int DEFAULT_BINS = 15;
24 public static final int MAXIMAL_BINS = 20;
25 public static final String REQUEST_KEY_BIN_COUNT = "bincount";
26 public static final String REQUEST_KEY_BIN_WIDTH = "binwidth";
27 public static final String REQUEST_KEY_CHART_WIDTH = "width";
28 public static final String REQUEST_KEY_LOCALE = "locale";
29 public static final String REQUEST_KEY_BIN_CHOICE = "bintype";
30
31 private static Logger logger = Logger.getLogger(DefaultHistogram.class);
32
33 protected Map requestParameter;
34
35
36 public DefaultHistogram(
37 ChartLabels labels, Object[] data, ChartTheme theme, Map requestParameter
38 ) {
39 super(labels, data, theme);
40 this.requestParameter = requestParameter;
41 }
42
43
44 protected void applyDatasets() {
45 XYPlot plot = (XYPlot) chart.getPlot();
46
47 // prepare data and create add them to histogram dataset
48 String name = (String) data[0];
49 double[] values = toDouble((Double[]) data[1]);
50 int bins = getBinCount(values);
51
52 HistogramDataset dataset = new HistogramDataset();
53 dataset.addSeries(name, values, bins);
54
55 plot.setDataset(0, dataset);
56 }
57
58
59 protected double[] getMinMax(double[] values) {
60 double[] minmax = new double[2];
61 minmax[0] = Double.MAX_VALUE;
62 minmax[1] = Double.MIN_VALUE;
63
64 int length = values.length;
65 for (int i = 0; i < length; i++) {
66 minmax[0] = values[i] < minmax[0] ? values[i] : minmax[0];
67 minmax[1] = values[i] > minmax[1] ? values[i] : minmax[1];
68 }
69
70 return minmax;
71 }
72
73
74 protected double[] toDouble(Double[] array) {
75 int length = array.length;
76 double[] values = new double[length];
77
78 for(int i = 0; i < length; i++) {
79 values[i] = array[i].doubleValue();
80 }
81
82 return values;
83 }
84
85
86 protected int getBinCount(double[] values) {
87 String param = (String) requestParameter.get(REQUEST_KEY_BIN_CHOICE);
88
89 if (param != null && param.equalsIgnoreCase(REQUEST_KEY_BIN_WIDTH)) {
90 return getBinCountByWidth(values);
91 }
92 else {
93 return getBinCountByNumber();
94 }
95 }
96
97
98 protected int getBinCountByNumber() {
99 int bins = -1;
100 String param = (String) requestParameter.get(REQUEST_KEY_BIN_COUNT);
101
102 try {
103 bins = Integer.parseInt(param);
104 bins = bins <= 0 ? DEFAULT_BINS : bins;
105 bins = bins > MAXIMAL_BINS ? MAXIMAL_BINS : bins;
106
107 return bins;
108 }
109 catch (NumberFormatException nfe) {
110 logger.warn("Invalid number of bins for histogram chart: " + param);
111 logger.warn("Return default bins: " + DEFAULT_BINS);
112
113 return DEFAULT_BINS;
114 }
115 }
116
117
118 protected int getBinCountByWidth(double[] values) {
119 int bins = -1;
120 String param = (String) requestParameter.get(REQUEST_KEY_BIN_WIDTH);
121 Locale locale = (Locale) requestParameter.get(REQUEST_KEY_LOCALE);
122 NumberFormat format = NumberFormat.getInstance(locale);
123
124 try {
125 double[] minmax = getMinMax(values);
126 double totalWidth = minmax[1] - minmax[0];
127 Number number = format.parse(param);
128 double binWidth = -1d;
129
130 if (number instanceof Double) {
131 binWidth = ((Double) number).doubleValue();
132 }
133 else if (number instanceof Long) {
134 binWidth = ((Long) number).doubleValue();
135 }
136 else if (number instanceof Integer) {
137 binWidth = ((Integer) number).doubleValue();
138 }
139 else {
140 logger.warn("Invalid bin width for histogram chart: " + param);
141 logger.warn("Return default bins: " + DEFAULT_BINS);
142
143 return DEFAULT_BINS;
144 }
145
146 double tmpBins = totalWidth / binWidth;
147
148 bins = (int) Math.round(tmpBins);
149 bins = bins <= 0 ? DEFAULT_BINS : bins;
150 bins = bins > MAXIMAL_BINS ? MAXIMAL_BINS : bins;
151
152 return bins;
153 }
154 catch (ParseException pe) {
155 logger.warn("Invalid bin width for histogram chart: " + param);
156 logger.warn("Return default bins: " + DEFAULT_BINS);
157
158 return DEFAULT_BINS;
159 }
160 catch (NumberFormatException nfe) {
161 logger.warn("Invalid bin width for histogram chart: " + param);
162 logger.warn("Return default bins: " + DEFAULT_BINS);
163
164 return DEFAULT_BINS;
165 }
166 }
167 }
168 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
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