Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/chart/AbstractHistogram.java @ 1107:86ca3c10523f

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Adjust the format of axes labels in histograms corresponding the specified locale (issue316). gnv-artifacts/trunk@1238 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 29 Jun 2010 07:37:36 +0000
parents 79401c871da4
children f953c9a559d8
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.Locale;
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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.ChartFactory;
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8 import org.jfree.chart.ChartTheme;
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9 import org.jfree.chart.JFreeChart;
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10
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11 import org.jfree.chart.axis.NumberAxis;
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12 import org.jfree.chart.axis.TickUnitSource;
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13
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14 import org.jfree.chart.plot.PlotOrientation;
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15 import org.jfree.chart.plot.XYPlot;
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16
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17 import org.jfree.chart.renderer.xy.XYBarRenderer;
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18
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19 /**
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20 * This abstract class defines some methods to adjust chart settings after its
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21 * creation.
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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 abstract class AbstractHistogram
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26 implements Chart
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27 {
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28 /**
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29 * Logger used for logging with Apache log4j.
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30 */
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31 private Logger logger = Logger.getLogger(AbstractHistogram.class);
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32
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33 /**
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34 * JFreeChart chart stored at this place after chart creation.
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35 */
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36 protected JFreeChart chart;
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37
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38 /**
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39 * Labels used for chart title, subtitle, axis description.
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40 */
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41 protected ChartLabels labels;
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42
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43 /**
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44 * Theme which is used to adjust the styling of this chart.
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45 */
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46 protected ChartTheme theme;
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48 /**
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49 * Raw data which should be displayed in the chart.
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50 */
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51 protected Object[] data;
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52
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53 /**
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54 * Locale object used for i18n support.
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55 */
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56 protected Locale locale;
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57
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58
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59 /**
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60 * Constructor for creating histogram charts.
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61 *
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62 * @param labels See {@link #labels}
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63 * @param data See {@link #data}
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64 * @param theme See {@link #theme}
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65 */
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66 public AbstractHistogram(
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67 ChartLabels labels, Object[] data, ChartTheme theme
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68 ) {
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69 this.labels = labels;
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70 this.data = data;
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71 this.theme = theme;
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72 }
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73
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74
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75 /**
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76 * @see de.intevation.gnv.chart.Chart#generateChart()
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77 */
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78 public JFreeChart generateChart() {
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79
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80 if (chart != null)
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81 return chart;
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82
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83 chart = ChartFactory.createHistogram(
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84 labels.getTitle(),
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85 labels.getDomainAxisLabel(),
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86 labels.getRangeAxisLabel(),
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87 null,
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88 PlotOrientation.VERTICAL,
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89 true,
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90 false,
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91 false);
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92
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93 applyDatasets();
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94
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95 theme.apply(chart);
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96 adjustPlot();
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97 adjustDomainAxis(chart);
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98 adjustRangeAxis(chart);
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99
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100 return chart;
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101 }
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102
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103
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104 /**
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105 * Method to do some changes in plot settings.
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106 */
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107 protected void adjustPlot() {
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108 XYPlot plot = (XYPlot) chart.getPlot();
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109 XYBarRenderer renderer = (XYBarRenderer) plot.getRenderer();
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110
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111 renderer.setShadowVisible(false);
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112 renderer.setSeriesVisibleInLegend(0, false);
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113 }
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115
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116 protected void adjustDomainAxis(JFreeChart chart) {
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117 XYPlot plot = (XYPlot) chart.getPlot();
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118 NumberAxis domainAxis = (NumberAxis) plot.getDomainAxis();
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119
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120 TickUnitSource tus = domainAxis.createStandardTickUnits(locale);
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121 domainAxis.setStandardTickUnits(tus);
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122 }
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123
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124
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125 protected void adjustRangeAxis(JFreeChart chart) {
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126 XYPlot plot = (XYPlot) chart.getPlot();
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127 NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
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128
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129 TickUnitSource tus = rangeAxis.createStandardTickUnits(locale);
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130 rangeAxis.setStandardTickUnits(tus);
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131 }
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132
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133
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134
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135
767
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136 /**
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137 * This method needs to be implemented by subclasses and should add valid
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138 * <code>HistogramDataset</code> objects to the created chart. It is called
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139 * by {@link #generateChart} after chart creation.
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140 */
617
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141 protected abstract void applyDatasets();
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142 }
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143 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org