Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/chart/DefaultHistogram.java @ 629:d08b9ba148c5

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Implemented logic to adjust number of bins corresponding to user input. gnv-artifacts/trunk@706 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Wed, 24 Feb 2010 14:30:52 +0000
parents 65f09139e9b3
children 79401c871da4
rev   line source
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1 package de.intevation.gnv.chart;
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2
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3 import java.text.NumberFormat;
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4 import java.text.ParseException;
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5 import java.util.Locale;
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6 import java.util.Map;
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7
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8 import org.apache.log4j.Logger;
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9
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10 import org.jfree.chart.ChartTheme;
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11
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12 import org.jfree.chart.plot.XYPlot;
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14 import org.jfree.data.statistics.HistogramDataset;
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15
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16 /**
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17 * @author Ingo Weinzierl (ingo.weinzierl@intevation.de)
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18 */
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19 public class DefaultHistogram
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20 extends AbstractHistogram
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21 {
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22 // TODO take a better default value
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23 public static final int DEFAULT_BINS = 15;
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24 public static final int MAXIMAL_BINS = 20;
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25 public static final String REQUEST_KEY_BIN_COUNT = "bincount";
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26 public static final String REQUEST_KEY_BIN_WIDTH = "binwidth";
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27 public static final String REQUEST_KEY_CHART_WIDTH = "width";
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28 public static final String REQUEST_KEY_LOCALE = "locale";
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29 public static final String REQUEST_KEY_BIN_CHOICE = "bintype";
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30
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31 private static Logger logger = Logger.getLogger(DefaultHistogram.class);
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32
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33 protected Map requestParameter;
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34
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35
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36 public DefaultHistogram(
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37 ChartLabels labels, Object[] data, ChartTheme theme, Map requestParameter
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38 ) {
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39 super(labels, data, theme);
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40 this.requestParameter = requestParameter;
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41 }
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42
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43
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44 protected void applyDatasets() {
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45 XYPlot plot = (XYPlot) chart.getPlot();
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46
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47 // prepare data and create add them to histogram dataset
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48 String name = (String) data[0];
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49 double[] values = toDouble((Double[]) data[1]);
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50 int bins = getBinCount(values);
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51
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52 HistogramDataset dataset = new HistogramDataset();
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53 dataset.addSeries(name, values, bins);
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54
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55 plot.setDataset(0, dataset);
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56 }
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57
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58
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59 protected double[] getMinMax(double[] values) {
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60 double[] minmax = new double[2];
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61 minmax[0] = Double.MAX_VALUE;
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62 minmax[1] = Double.MIN_VALUE;
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63
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64 int length = values.length;
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65 for (int i = 0; i < length; i++) {
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66 minmax[0] = values[i] < minmax[0] ? values[i] : minmax[0];
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67 minmax[1] = values[i] > minmax[1] ? values[i] : minmax[1];
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68 }
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69
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70 return minmax;
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71 }
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72
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73
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74 protected double[] toDouble(Double[] array) {
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75 int length = array.length;
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76 double[] values = new double[length];
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77
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78 for(int i = 0; i < length; i++) {
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79 values[i] = array[i].doubleValue();
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80 }
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81
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82 return values;
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83 }
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84
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85
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86 protected int getBinCount(double[] values) {
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87 String param = (String) requestParameter.get(REQUEST_KEY_BIN_CHOICE);
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88
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89 if (param != null && param.equalsIgnoreCase(REQUEST_KEY_BIN_WIDTH)) {
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90 return getBinCountByWidth(values);
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91 }
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92 else {
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93 return getBinCountByNumber();
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94 }
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95 }
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96
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97
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98 protected int getBinCountByNumber() {
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99 int bins = -1;
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100 String param = (String) requestParameter.get(REQUEST_KEY_BIN_COUNT);
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101
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102 try {
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103 bins = Integer.parseInt(param);
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104 bins = bins <= 0 ? DEFAULT_BINS : bins;
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105 bins = bins > MAXIMAL_BINS ? MAXIMAL_BINS : bins;
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106
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107 return bins;
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108 }
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109 catch (NumberFormatException nfe) {
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110 logger.warn("Invalid number of bins for histogram chart: " + param);
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111 logger.warn("Return default bins: " + DEFAULT_BINS);
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112
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113 return DEFAULT_BINS;
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114 }
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115 }
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116
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117
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118 protected int getBinCountByWidth(double[] values) {
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119 int bins = -1;
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120 String param = (String) requestParameter.get(REQUEST_KEY_BIN_WIDTH);
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121 Locale locale = (Locale) requestParameter.get(REQUEST_KEY_LOCALE);
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122 NumberFormat format = NumberFormat.getInstance(locale);
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123
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124 try {
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125 double[] minmax = getMinMax(values);
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126 double totalWidth = minmax[1] - minmax[0];
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127 Number number = format.parse(param);
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128 double binWidth = -1d;
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129
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130 if (number instanceof Double) {
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131 binWidth = ((Double) number).doubleValue();
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132 }
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133 else if (number instanceof Long) {
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134 binWidth = ((Long) number).doubleValue();
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135 }
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136 else if (number instanceof Integer) {
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137 binWidth = ((Integer) number).doubleValue();
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138 }
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139 else {
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140 logger.warn("Invalid bin width for histogram chart: " + param);
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141 logger.warn("Return default bins: " + DEFAULT_BINS);
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142
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143 return DEFAULT_BINS;
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144 }
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145
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146 double tmpBins = totalWidth / binWidth;
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147
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148 bins = (int) Math.round(tmpBins);
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149 bins = bins <= 0 ? DEFAULT_BINS : bins;
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150 bins = bins > MAXIMAL_BINS ? MAXIMAL_BINS : bins;
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151
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152 return bins;
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153 }
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154 catch (ParseException pe) {
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155 logger.warn("Invalid bin width for histogram chart: " + param);
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156 logger.warn("Return default bins: " + DEFAULT_BINS);
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157
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158 return DEFAULT_BINS;
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159 }
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160 catch (NumberFormatException nfe) {
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161 logger.warn("Invalid bin width for histogram chart: " + param);
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162 logger.warn("Return default bins: " + DEFAULT_BINS);
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163
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164 return DEFAULT_BINS;
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165 }
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166 }
617
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167 }
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168 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org