Mercurial > dive4elements > gnv-client
annotate gnv-artifacts/src/main/java/de/intevation/gnv/chart/DefaultHistogram.java @ 1028:41234fcf4c7e
Some Bugfixes which prevent Exceptions executing the Examples in the config-manual
gnv-artifacts/trunk@1052 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Tim Englich <tim.englich@intevation.de> |
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date | Tue, 04 May 2010 12:40:21 +0000 |
parents | 22c18083225e |
children | 8430269ec73b |
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 |
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6 import java.util.Locale; |
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7 import java.util.Map; |
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8 |
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9 import org.apache.log4j.Logger; |
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10 |
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11 import org.jfree.chart.ChartTheme; |
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12 |
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13 import org.jfree.chart.plot.XYPlot; |
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14 |
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15 import org.jfree.data.statistics.HistogramDataset; |
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16 |
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17 /** |
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18 * Default implementation of {@link de.intevation.gnv.chart.AbstractHistogram}. |
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19 * |
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20 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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21 */ |
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22 public class DefaultHistogram |
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23 extends AbstractHistogram |
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24 { |
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25 /** |
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26 * Default bin count. |
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27 * TODO find a better default value |
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28 */ |
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29 public static final int DEFAULT_BINS = 15; |
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30 |
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31 /** |
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32 * Constant field for limitating the number of bin in a single histogram. |
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33 */ |
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34 public static final int MAXIMAL_BINS = 20; |
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35 |
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36 /** |
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37 * Default key to retrieve the number of bins from {@link |
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38 * #requestParameter}. |
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39 */ |
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40 public static final String REQUEST_KEY_BIN_COUNT = "bincount"; |
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41 |
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42 /** |
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43 * Default key to retrieve the width of a single bin from {@link |
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44 * #requestParameter}. |
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45 */ |
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46 public static final String REQUEST_KEY_BIN_WIDTH = "binwidth"; |
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47 |
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48 /** |
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49 * Default key to retrieve the chart width from {@link #requestParameter}. |
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50 */ |
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51 public static final String REQUEST_KEY_CHART_WIDTH = "width"; |
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52 |
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53 /** |
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54 * Default key to retrieve the <code>Locale</code> object from {@link |
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55 * #requestParameter} used for i18n support. |
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56 */ |
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57 public static final String REQUEST_KEY_LOCALE = "locale"; |
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58 |
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59 /** |
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60 * Default key to retrieve the object from {@link #requestParameter}. It |
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61 * defines which value this chart has to be used for bin calculation. You |
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62 * can either adjust the number of bins or the width of a single bin. |
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63 */ |
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64 public static final String REQUEST_KEY_BIN_CHOICE = "bintype"; |
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65 |
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66 /** |
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67 * Logger used for logging with log4j. |
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68 */ |
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69 private static Logger logger = Logger.getLogger(DefaultHistogram.class); |
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70 |
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71 /** |
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72 * Object storing some further parameter used for chart settings. |
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73 */ |
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74 protected Map requestParameter; |
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75 |
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76 |
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77 /** |
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78 * Constructor to create DefaultHistogram objects. |
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79 * |
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80 * @param labels Labels to decorate this chart. |
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81 * @param data Raw data to be displayed in histogram. |
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82 * @param theme Theme used to adjust the chart look. |
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83 * @param requestParameter Object which serves some further settings. |
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84 */ |
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85 public DefaultHistogram( |
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86 ChartLabels labels, Object[] data, ChartTheme theme, Map requestParameter |
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87 ) { |
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88 super(labels, data, theme); |
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89 this.requestParameter = requestParameter; |
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90 } |
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91 |
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92 |
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93 @Override |
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94 protected void applyDatasets() { |
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95 XYPlot plot = (XYPlot) chart.getPlot(); |
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96 |
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97 // prepare data and create add them to histogram dataset |
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98 String name = (String) data[0]; |
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99 double[] values = toDouble((Double[]) data[1]); |
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100 int bins = getBinCount(values); |
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101 |
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102 HistogramDataset dataset = new HistogramDataset(); |
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103 dataset.addSeries(name, values, bins); |
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104 |
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105 plot.setDataset(0, dataset); |
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106 } |
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107 |
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108 |
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109 /** |
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110 * Method which scans the hole bunch of values and returns an array with |
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111 * contains min and max value. Min value is stored at position 0, max value |
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112 * is stored at position 1 in that array. |
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113 * |
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114 * @param values Array which contains all values |
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115 * |
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116 * @return Array which contains min and max value |
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117 */ |
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118 protected double[] getMinMax(double[] values) { |
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119 double[] minmax = new double[2]; |
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120 minmax[0] = Double.MAX_VALUE; |
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121 minmax[1] = Double.MIN_VALUE; |
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122 |
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123 int length = values.length; |
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124 for (int i = 0; i < length; i++) { |
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125 minmax[0] = values[i] < minmax[0] ? values[i] : minmax[0]; |
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126 minmax[1] = values[i] > minmax[1] ? values[i] : minmax[1]; |
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127 } |
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128 |
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129 return minmax; |
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130 } |
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131 |
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132 |
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133 /** |
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134 * Turn a Double[] into a double[]. |
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135 * |
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136 * @param array Doube[] |
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137 * |
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138 * @return double[] |
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139 */ |
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140 protected double[] toDouble(Double[] array) { |
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141 int length = array.length; |
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142 double[] values = new double[length]; |
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143 |
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144 for(int i = 0; i < length; i++) { |
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145 values[i] = array[i].doubleValue(); |
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146 } |
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147 |
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148 return values; |
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149 } |
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150 |
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151 |
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152 /** |
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153 * Method to calculate the number of bins this chart should be parted into. |
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154 * The real calculation takes place in {@link #getBinCountByNumber} and |
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155 * {@link #getBinCountByWidth}. This method switches between these methods |
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156 * depending on the object stored in {@link #requestParameter}. |
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157 * |
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158 * @param values All values used in this histogram |
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159 * |
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160 * @return Number of bins |
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161 */ |
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162 protected int getBinCount(double[] values) { |
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163 String param = (String) requestParameter.get(REQUEST_KEY_BIN_CHOICE); |
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164 |
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165 if (param != null && param.equalsIgnoreCase(REQUEST_KEY_BIN_WIDTH)) { |
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166 return getBinCountByWidth(values); |
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167 } |
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168 else { |
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169 return getBinCountByNumber(); |
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170 } |
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171 } |
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172 |
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173 |
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174 /** |
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175 * Method to retrieve the number of bins. If {@link #requestParameter} |
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176 * contains a valid <code>Integer</code> at |
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177 * <code>REQUEST_KEY_BIN_COUNT</code> and this is smaller than or equal |
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178 * {@link #MAXIMAL_BINS}, this value is used. If no valid |
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179 * <code>Integer</code> is given or if the value in {@link #requestParameter} |
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180 * is bigger than {@link #MAXIMAL_BINS}, {@link #DEFAULT_BINS} is used. |
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181 * |
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182 * @return Number of bins |
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183 */ |
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184 protected int getBinCountByNumber() { |
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185 int bins = -1; |
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186 String param = (String) requestParameter.get(REQUEST_KEY_BIN_COUNT); |
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187 |
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188 try { |
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189 bins = Integer.parseInt(param); |
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190 bins = bins <= 0 ? DEFAULT_BINS : bins; |
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191 bins = bins > MAXIMAL_BINS ? MAXIMAL_BINS : bins; |
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192 |
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193 return bins; |
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194 } |
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195 catch (NumberFormatException nfe) { |
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196 logger.warn("Invalid number of bins for histogram chart: " + param); |
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197 logger.warn("Return default bins: " + DEFAULT_BINS); |
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198 |
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199 return DEFAULT_BINS; |
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200 } |
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201 } |
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202 |
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203 |
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204 /** |
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205 * Serves the number of bins depending on a given width for each bin, but |
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206 * maximum bin count is limited by {@link #MAXIMAL_BINS}. |
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207 * |
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208 * @param values All values in this histogram |
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209 * |
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210 * @return Number of bins |
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211 */ |
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212 protected int getBinCountByWidth(double[] values) { |
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213 int bins = -1; |
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214 String param = (String) requestParameter.get(REQUEST_KEY_BIN_WIDTH); |
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215 Locale locale = (Locale) requestParameter.get(REQUEST_KEY_LOCALE); |
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216 NumberFormat format = NumberFormat.getInstance(locale); |
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217 |
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218 try { |
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219 double[] minmax = getMinMax(values); |
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220 double totalWidth = minmax[1] - minmax[0]; |
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221 Number number = format.parse(param); |
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222 double binWidth = -1d; |
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223 |
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224 if (number instanceof Double) { |
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225 binWidth = ((Double) number).doubleValue(); |
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226 } |
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227 else if (number instanceof Long) { |
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228 binWidth = ((Long) number).doubleValue(); |
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229 } |
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230 else if (number instanceof Integer) { |
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231 binWidth = ((Integer) number).doubleValue(); |
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232 } |
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233 else { |
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234 logger.warn("Invalid bin width for histogram chart: " + param); |
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235 logger.warn("Return default bins: " + DEFAULT_BINS); |
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236 |
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237 return DEFAULT_BINS; |
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238 } |
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239 |
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240 double tmpBins = totalWidth / binWidth; |
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241 |
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242 bins = (int) Math.round(tmpBins); |
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243 bins = bins <= 0 ? DEFAULT_BINS : bins; |
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244 bins = bins > MAXIMAL_BINS ? MAXIMAL_BINS : bins; |
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245 |
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246 return bins; |
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247 } |
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248 catch (ParseException pe) { |
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249 logger.warn("Invalid bin width for histogram chart: " + param); |
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250 logger.warn("Return default bins: " + DEFAULT_BINS); |
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251 |
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252 return DEFAULT_BINS; |
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253 } |
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254 catch (NumberFormatException nfe) { |
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255 logger.warn("Invalid bin width for histogram chart: " + param); |
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256 logger.warn("Return default bins: " + DEFAULT_BINS); |
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257 |
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258 return DEFAULT_BINS; |
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259 } |
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260 } |
617
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261 } |
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262 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 : |