Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/chart/DefaultHistogram.java @ 1129:ccfa07b88476

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merged geo-backend
author Thomas Arendsen Hein <thomas@intevation.de>
date Fri, 28 Sep 2012 12:14:01 +0200
parents f953c9a559d8
children
rev   line source
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1 /*
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2 * Copyright (c) 2010 by Intevation GmbH
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3 *
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4 * This program is free software under the LGPL (>=v2.1)
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5 * Read the file LGPL.txt coming with the software for details
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6 * or visit http://www.gnu.org/licenses/ if it does not exist.
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7 */
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8
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9 package de.intevation.gnv.chart;
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10
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11 import java.util.Locale;
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12 import java.util.Map;
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13
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14 import org.apache.log4j.Logger;
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15
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16 import org.jfree.chart.ChartTheme;
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17
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18 import org.jfree.chart.plot.XYPlot;
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19
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20 /**
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21 * Default implementation of {@link de.intevation.gnv.chart.AbstractHistogram}.
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22 *
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23 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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24 */
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25 public class DefaultHistogram
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26 extends AbstractHistogram
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27 {
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28 /**
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29 * Default bin count.
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30 * TODO find a better default value
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31 */
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32 public static final int DEFAULT_BINS = 15;
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33
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34 /**
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35 * Constant field for limitating the number of bin in a single histogram.
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36 */
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37 public static final int MAXIMAL_BINS = 20;
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39 /**
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40 * Default key to retrieve the number of bins from {@link
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41 * #requestParameter}.
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42 */
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43 public static final String REQUEST_KEY_BIN_COUNT = "bincount";
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45 /**
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46 * Default key to retrieve the width of a single bin from {@link
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47 * #requestParameter}.
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48 */
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49 public static final String REQUEST_KEY_BIN_WIDTH = "binwidth";
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51 /**
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52 * Default key to retrieve the chart width from {@link #requestParameter}.
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53 */
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54 public static final String REQUEST_KEY_CHART_WIDTH = "width";
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55
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56 /**
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57 * Default key to retrieve the object from {@link #requestParameter}. It
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58 * defines which value this chart has to be used for bin calculation. You
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59 * can either adjust the number of bins or the width of a single bin.
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60 */
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61 public static final String REQUEST_KEY_BIN_CHOICE = "bintype";
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62
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63 /**
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64 * Logger used for logging with log4j.
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65 */
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66 private static Logger logger = Logger.getLogger(DefaultHistogram.class);
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67
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68 /**
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69 * Object storing some further parameter used for chart settings.
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70 */
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71 protected Map requestParameter;
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72
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73 protected double[] minmax = null;
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74
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75
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76 /**
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77 * Constructor to create DefaultHistogram objects.
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78 *
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79 * @param labels Labels to decorate this chart.
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80 * @param data Raw data to be displayed in histogram.
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81 * @param theme Theme used to adjust the chart look.
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82 * @param requestParameter Object which serves some further settings.
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83 */
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84 public DefaultHistogram(
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85 ChartLabels labels, Object[] data, ChartTheme theme, Map requestParameter
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86 ) {
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87 super(labels, data, theme);
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88 this.requestParameter = requestParameter;
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89 this.locale = (Locale) requestParameter.get("locale");
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90 }
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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
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101 double binWidth = getBinWidth(values);
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102 int binCount = getBinCount();
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104 AdvancedHistogramDataset dataset =
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105 new AdvancedHistogramDataset(binCount, binWidth);
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106 dataset.addSeries(name, values);
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107
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108 plot.setDataset(0, dataset);
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109 }
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111
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112 /**
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113 * Method which scans the hole bunch of values and returns an array with
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114 * contains min and max value. Min value is stored at position 0, max value
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115 * is stored at position 1 in that array.
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116 *
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117 * @param values Array which contains all values
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118 *
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119 * @return Array which contains min and max value
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120 */
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121 protected double[] getMinMax(double[] values) {
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122 if (minmax != null)
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123 return minmax;
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124
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125 double[] minmax = new double[2];
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126 minmax[0] = Double.MAX_VALUE;
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127 minmax[1] = Double.MIN_VALUE;
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128
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129 int length = values.length;
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130 for (int i = 0; i < length; i++) {
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131 minmax[0] = values[i] < minmax[0] ? values[i] : minmax[0];
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132 minmax[1] = values[i] > minmax[1] ? values[i] : minmax[1];
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133 }
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134
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135 this.minmax = minmax;
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136
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137 return minmax;
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138 }
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139
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140
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141 /**
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142 * Turn a Double[] into a double[].
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143 *
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144 * @param array Doube[]
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145 *
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146 * @return double[]
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147 */
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148 protected double[] toDouble(Double[] array) {
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149 int length = array.length;
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150 double[] values = new double[length];
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151
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152 for(int i = 0; i < length; i++) {
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153 values[i] = array[i].doubleValue();
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154 }
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155
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156 return values;
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157 }
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158
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159
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160 /**
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161 * Method to retrieve the number of bins.
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162 *
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163 * @return the number of bins that is specified in <i>requestParameter</i>
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164 * or -1 if the number of bins is not the dominant value to calculate the
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165 * width of a single bin.
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166 */
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167 protected int getBinCount() {
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168 // Return -1 to trigger a calculation of the number of bins in
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169 // AdvancedHistogramDataset if the user chose the bin width as dominant
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170 // value.
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171 String choice = (String) requestParameter.get(REQUEST_KEY_BIN_CHOICE);
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172 if (choice != null && choice.equalsIgnoreCase(REQUEST_KEY_BIN_WIDTH)) {
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173 return -1;
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174 }
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175
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176 int bins = -1;
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177 String param = (String) requestParameter.get(REQUEST_KEY_BIN_COUNT);
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178
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179 try {
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180 bins = Integer.parseInt(param);
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181 bins = bins <= 0 ? DEFAULT_BINS : bins;
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182 bins = bins > MAXIMAL_BINS ? MAXIMAL_BINS : bins;
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183
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184 return bins;
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185 }
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186 catch (NumberFormatException nfe) {
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187 logger.warn("Invalid number of bins for histogram chart: " + param);
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188 logger.warn("Return default bins: " + DEFAULT_BINS);
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189
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190 return DEFAULT_BINS;
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191 }
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192 }
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193
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194
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195 /**
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196 * Serves width of a single bin.
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197 *
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198 * @param values All values in this histogram
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199 *
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200 * @return The bin width that is given in <i>requestParameter</i> or -1 if
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201 * the bin width is not the dominant value for calculating the number of
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202 * bins in the histogram.
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203 */
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204 protected double getBinWidth(double[] values) {
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205 // Return -1 to trigger a calculation of the bin width in
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206 // AdvancedHistogramDataset if the user chose the number of bins as
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207 // dominant value.
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208 String choice = (String) requestParameter.get(REQUEST_KEY_BIN_CHOICE);
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209 if (choice == null || !choice.equalsIgnoreCase(REQUEST_KEY_BIN_WIDTH)) {
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210 return -1;
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211 }
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212
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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
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216 double[] minmax = getMinMax(values);
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217 double totalWidth = minmax[1] - minmax[0];
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218 double binWidth = Double.parseDouble(param);
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219
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220 double tmpBins = totalWidth / binWidth;
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221
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222 bins = (int) Math.round(tmpBins);
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223 bins = bins <= 0 ? DEFAULT_BINS : bins;
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224
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225 // the calculated number of bins with the given width exceed the maximum
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226 // number of bins.
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227 if (bins > MAXIMAL_BINS) {
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228 return totalWidth / (MAXIMAL_BINS);
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229 }
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230
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231 return binWidth;
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232 }
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233 }
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234 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org