Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/chart/DefaultHistogram.java @ 1055:bb2679624c6a

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Implemented a new histogram dataset that takes the width of a single bin as well as the number of bins for the histogram (issue288). gnv-artifacts/trunk@1130 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 27 May 2010 07:41:14 +0000
parents 8430269ec73b
children 86ca3c10523f
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.util.Map;
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4
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5 import org.apache.log4j.Logger;
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6
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7 import org.jfree.chart.ChartTheme;
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8
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9 import org.jfree.chart.plot.XYPlot;
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10
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11 /**
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12 * Default implementation of {@link de.intevation.gnv.chart.AbstractHistogram}.
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13 *
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14 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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15 */
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16 public class DefaultHistogram
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17 extends AbstractHistogram
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18 {
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19 /**
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20 * Default bin count.
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21 * TODO find a better default value
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22 */
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23 public static final int DEFAULT_BINS = 15;
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24
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25 /**
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26 * Constant field for limitating the number of bin in a single histogram.
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27 */
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28 public static final int MAXIMAL_BINS = 20;
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30 /**
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31 * Default key to retrieve the number of bins from {@link
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32 * #requestParameter}.
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33 */
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34 public static final String REQUEST_KEY_BIN_COUNT = "bincount";
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35
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36 /**
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37 * Default key to retrieve the width of a single bin 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_WIDTH = "binwidth";
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41
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42 /**
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43 * Default key to retrieve the chart width from {@link #requestParameter}.
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44 */
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45 public static final String REQUEST_KEY_CHART_WIDTH = "width";
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46
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47 /**
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48 * Default key to retrieve the object from {@link #requestParameter}. It
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49 * defines which value this chart has to be used for bin calculation. You
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50 * can either adjust the number of bins or the width of a single bin.
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51 */
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52 public static final String REQUEST_KEY_BIN_CHOICE = "bintype";
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53
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54 /**
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55 * Logger used for logging with log4j.
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56 */
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57 private static Logger logger = Logger.getLogger(DefaultHistogram.class);
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58
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59 /**
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60 * Object storing some further parameter used for chart settings.
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61 */
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62 protected Map requestParameter;
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63
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64 protected double[] minmax = null;
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65
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66
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67 /**
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68 * Constructor to create DefaultHistogram objects.
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69 *
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70 * @param labels Labels to decorate this chart.
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71 * @param data Raw data to be displayed in histogram.
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72 * @param theme Theme used to adjust the chart look.
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73 * @param requestParameter Object which serves some further settings.
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74 */
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75 public DefaultHistogram(
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76 ChartLabels labels, Object[] data, ChartTheme theme, Map requestParameter
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77 ) {
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78 super(labels, data, theme);
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79 this.requestParameter = requestParameter;
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80 }
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82
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83 @Override
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84 protected void applyDatasets() {
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85 XYPlot plot = (XYPlot) chart.getPlot();
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86
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87 // prepare data and create add them to histogram dataset
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88 String name = (String) data[0];
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89 double[] values = toDouble((Double[]) data[1]);
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90
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91 double binWidth = getBinWidth(values);
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92 int binCount = getBinCount();
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94 AdvancedHistogramDataset dataset =
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95 new AdvancedHistogramDataset(binCount, binWidth);
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96 dataset.addSeries(name, values);
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97
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98 plot.setDataset(0, dataset);
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99 }
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101
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102 /**
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103 * Method which scans the hole bunch of values and returns an array with
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104 * contains min and max value. Min value is stored at position 0, max value
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105 * is stored at position 1 in that array.
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106 *
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107 * @param values Array which contains all values
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108 *
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109 * @return Array which contains min and max value
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110 */
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111 protected double[] getMinMax(double[] values) {
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112 if (minmax != null)
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113 return minmax;
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114
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115 double[] minmax = new double[2];
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116 minmax[0] = Double.MAX_VALUE;
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117 minmax[1] = Double.MIN_VALUE;
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118
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119 int length = values.length;
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120 for (int i = 0; i < length; i++) {
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121 minmax[0] = values[i] < minmax[0] ? values[i] : minmax[0];
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122 minmax[1] = values[i] > minmax[1] ? values[i] : minmax[1];
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123 }
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124
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125 this.minmax = minmax;
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126
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127 return minmax;
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128 }
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129
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130
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131 /**
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132 * Turn a Double[] into a double[].
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133 *
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134 * @param array Doube[]
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135 *
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136 * @return double[]
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137 */
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138 protected double[] toDouble(Double[] array) {
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139 int length = array.length;
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140 double[] values = new double[length];
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141
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142 for(int i = 0; i < length; i++) {
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143 values[i] = array[i].doubleValue();
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144 }
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145
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146 return values;
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147 }
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148
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149
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150 /**
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151 * Method to retrieve the number of bins.
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152 *
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153 * @return the number of bins that is specified in <i>requestParameter</i>
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154 * or -1 if the number of bins is not the dominant value to calculate the
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155 * width of a single bin.
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156 */
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157 protected int getBinCount() {
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158 // Return -1 to trigger a calculation of the number of bins in
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159 // AdvancedHistogramDataset if the user chose the bin width as dominant
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160 // value.
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161 String choice = (String) requestParameter.get(REQUEST_KEY_BIN_CHOICE);
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162 if (choice != null && choice.equalsIgnoreCase(REQUEST_KEY_BIN_WIDTH)) {
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163 return -1;
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164 }
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165
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166 int bins = -1;
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167 String param = (String) requestParameter.get(REQUEST_KEY_BIN_COUNT);
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168
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169 try {
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170 bins = Integer.parseInt(param);
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171 bins = bins <= 0 ? DEFAULT_BINS : bins;
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172 bins = bins > MAXIMAL_BINS ? MAXIMAL_BINS : bins;
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173
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174 return bins;
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175 }
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176 catch (NumberFormatException nfe) {
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177 logger.warn("Invalid number of bins for histogram chart: " + param);
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178 logger.warn("Return default bins: " + DEFAULT_BINS);
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179
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180 return DEFAULT_BINS;
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181 }
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182 }
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183
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184
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185 /**
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186 * Serves width of a single bin.
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187 *
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188 * @param values All values in this histogram
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189 *
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190 * @return The bin width that is given in <i>requestParameter</i> or -1 if
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191 * the bin width is not the dominant value for calculating the number of
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192 * bins in the histogram.
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193 */
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194 protected double getBinWidth(double[] values) {
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195 // Return -1 to trigger a calculation of the bin width in
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196 // AdvancedHistogramDataset if the user chose the number of bins as
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197 // dominant value.
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198 String choice = (String) requestParameter.get(REQUEST_KEY_BIN_CHOICE);
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199 if (choice == null || !choice.equalsIgnoreCase(REQUEST_KEY_BIN_WIDTH)) {
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200 return -1;
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201 }
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202
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203 int bins = -1;
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204 String param = (String) requestParameter.get(REQUEST_KEY_BIN_WIDTH);
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205
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206 double[] minmax = getMinMax(values);
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207 double totalWidth = minmax[1] - minmax[0];
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208 double binWidth = Double.parseDouble(param);
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209
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210 double tmpBins = totalWidth / binWidth;
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211
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212 bins = (int) Math.round(tmpBins);
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213 bins = bins <= 0 ? DEFAULT_BINS : bins;
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214
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215 // the calculated number of bins with the given width exceed the maximum
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216 // number of bins.
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217 if (bins > MAXIMAL_BINS) {
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218 return totalWidth / (MAXIMAL_BINS);
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219 }
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220
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221 return binWidth;
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222 }
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223 }
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224 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org