Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/chart/DefaultHistogram.java @ 1054:8430269ec73b

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Removed the parsing for double/integer values specifying the bin width or the number of bins in DefaultHistogram, because these inserted values are no longer i18n strings (issue289). gnv-artifacts/trunk@1128 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Wed, 26 May 2010 17:01:29 +0000
parents 22c18083225e
children bb2679624c6a
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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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 object from {@link #requestParameter}. It
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55 * defines which value this chart has to be used for bin calculation. You
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56 * can either adjust the number of bins or the width of a single bin.
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57 */
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58 public static final String REQUEST_KEY_BIN_CHOICE = "bintype";
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59
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60 /**
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61 * Logger used for logging with log4j.
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62 */
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63 private static Logger logger = Logger.getLogger(DefaultHistogram.class);
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64
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65 /**
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66 * Object storing some further parameter used for chart settings.
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67 */
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68 protected Map requestParameter;
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69
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71 /**
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72 * Constructor to create DefaultHistogram objects.
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73 *
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74 * @param labels Labels to decorate this chart.
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75 * @param data Raw data to be displayed in histogram.
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76 * @param theme Theme used to adjust the chart look.
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77 * @param requestParameter Object which serves some further settings.
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78 */
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79 public DefaultHistogram(
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80 ChartLabels labels, Object[] data, ChartTheme theme, Map requestParameter
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81 ) {
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82 super(labels, data, theme);
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83 this.requestParameter = requestParameter;
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84 }
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86
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87 @Override
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88 protected void applyDatasets() {
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89 XYPlot plot = (XYPlot) chart.getPlot();
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90
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91 // prepare data and create add them to histogram dataset
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92 String name = (String) data[0];
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93 double[] values = toDouble((Double[]) data[1]);
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94 int bins = getBinCount(values);
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95
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96 HistogramDataset dataset = new HistogramDataset();
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97 dataset.addSeries(name, values, bins);
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98
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99 plot.setDataset(0, dataset);
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100 }
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102
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103 /**
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104 * Method which scans the hole bunch of values and returns an array with
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105 * contains min and max value. Min value is stored at position 0, max value
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106 * is stored at position 1 in that array.
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107 *
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108 * @param values Array which contains all values
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109 *
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110 * @return Array which contains min and max value
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111 */
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112 protected double[] getMinMax(double[] values) {
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113 double[] minmax = new double[2];
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114 minmax[0] = Double.MAX_VALUE;
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115 minmax[1] = Double.MIN_VALUE;
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116
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117 int length = values.length;
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118 for (int i = 0; i < length; i++) {
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119 minmax[0] = values[i] < minmax[0] ? values[i] : minmax[0];
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120 minmax[1] = values[i] > minmax[1] ? values[i] : minmax[1];
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121 }
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122
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123 return minmax;
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124 }
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125
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126
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127 /**
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128 * Turn a Double[] into a double[].
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129 *
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130 * @param array Doube[]
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131 *
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132 * @return double[]
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133 */
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134 protected double[] toDouble(Double[] array) {
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135 int length = array.length;
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136 double[] values = new double[length];
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137
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138 for(int i = 0; i < length; i++) {
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139 values[i] = array[i].doubleValue();
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140 }
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141
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142 return values;
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143 }
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144
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145
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146 /**
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147 * Method to calculate the number of bins this chart should be parted into.
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148 * The real calculation takes place in {@link #getBinCountByNumber} and
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149 * {@link #getBinCountByWidth}. This method switches between these methods
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150 * depending on the object stored in {@link #requestParameter}.
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151 *
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152 * @param values All values used in this histogram
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153 *
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154 * @return Number of bins
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155 */
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156 protected int getBinCount(double[] values) {
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157 String param = (String) requestParameter.get(REQUEST_KEY_BIN_CHOICE);
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158
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159 if (param != null && param.equalsIgnoreCase(REQUEST_KEY_BIN_WIDTH)) {
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160 return getBinCountByWidth(values);
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161 }
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162 else {
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163 return getBinCountByNumber();
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164 }
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165 }
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166
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167
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168 /**
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169 * Method to retrieve the number of bins. If {@link #requestParameter}
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170 * contains a valid <code>Integer</code> at
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171 * <code>REQUEST_KEY_BIN_COUNT</code> and this is smaller than or equal
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172 * {@link #MAXIMAL_BINS}, this value is used. If no valid
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173 * <code>Integer</code> is given or if the value in {@link #requestParameter}
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174 * is bigger than {@link #MAXIMAL_BINS}, {@link #DEFAULT_BINS} is used.
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175 *
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176 * @return Number of bins
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177 */
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178 protected int getBinCountByNumber() {
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179 int bins = -1;
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180 String param = (String) requestParameter.get(REQUEST_KEY_BIN_COUNT);
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181
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182 try {
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183 bins = Integer.parseInt(param);
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184 bins = bins <= 0 ? DEFAULT_BINS : bins;
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185 bins = bins > MAXIMAL_BINS ? MAXIMAL_BINS : bins;
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186
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187 return bins;
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188 }
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189 catch (NumberFormatException nfe) {
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190 logger.warn("Invalid number of bins for histogram chart: " + param);
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191 logger.warn("Return default bins: " + DEFAULT_BINS);
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192
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193 return DEFAULT_BINS;
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194 }
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195 }
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196
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197
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198 /**
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199 * Serves the number of bins depending on a given width for each bin, but
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200 * maximum bin count is limited by {@link #MAXIMAL_BINS}.
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201 *
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202 * @param values All values in this histogram
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203 *
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204 * @return Number of bins
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205 */
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206 protected int getBinCountByWidth(double[] values) {
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207 int bins = -1;
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208 String param = (String) requestParameter.get(REQUEST_KEY_BIN_WIDTH);
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209
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210 double[] minmax = getMinMax(values);
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211 double totalWidth = minmax[1] - minmax[0];
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212 double binWidth = Double.parseDouble(param);
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213
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214 double tmpBins = totalWidth / binWidth;
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215
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216 bins = (int) Math.round(tmpBins);
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217 bins = bins <= 0 ? DEFAULT_BINS : bins;
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218 bins = bins > MAXIMAL_BINS ? MAXIMAL_BINS : bins;
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219
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220 return bins;
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221 }
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222 }
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223 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org