Mercurial > dive4elements > gnv-client
annotate gnv-artifacts/src/main/java/de/intevation/gnv/chart/DefaultHistogram.java @ 1080:01e26528bb39
Some code refactoring for the implementation of histograms using vectorial parameters.
gnv-artifacts/trunk@1182 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Wed, 09 Jun 2010 09:37:57 +0000 |
parents | bb2679624c6a |
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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29 |
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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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81 |
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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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93 |
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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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100 |
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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 |
1054
8430269ec73b
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).
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210 double tmpBins = totalWidth / binWidth; |
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Implemented logic to adjust number of bins corresponding to user input.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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211 |
1054
8430269ec73b
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).
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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212 bins = (int) Math.round(tmpBins); |
8430269ec73b
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).
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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213 bins = bins <= 0 ? DEFAULT_BINS : bins; |
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Implemented logic to adjust number of bins corresponding to user input.
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parents:
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214 |
1055
bb2679624c6a
Implemented a new histogram dataset that takes the width of a single bin as well as the number of bins for the histogram (issue288).
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parents:
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215 // the calculated number of bins with the given width exceed the maximum |
bb2679624c6a
Implemented a new histogram dataset that takes the width of a single bin as well as the number of bins for the histogram (issue288).
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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216 // number of bins. |
bb2679624c6a
Implemented a new histogram dataset that takes the width of a single bin as well as the number of bins for the histogram (issue288).
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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217 if (bins > MAXIMAL_BINS) { |
bb2679624c6a
Implemented a new histogram dataset that takes the width of a single bin as well as the number of bins for the histogram (issue288).
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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218 return totalWidth / (MAXIMAL_BINS); |
bb2679624c6a
Implemented a new histogram dataset that takes the width of a single bin as well as the number of bins for the histogram (issue288).
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
1054
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219 } |
bb2679624c6a
Implemented a new histogram dataset that takes the width of a single bin as well as the number of bins for the histogram (issue288).
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
1054
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220 |
bb2679624c6a
Implemented a new histogram dataset that takes the width of a single bin as well as the number of bins for the histogram (issue288).
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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221 return binWidth; |
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Implemented logic to adjust number of bins corresponding to user input.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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222 } |
617
3d13fa281a7e
Added new ouput mode: histogram.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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223 } |
3d13fa281a7e
Added new ouput mode: histogram.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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224 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 : |