Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/chart/AbstractHistogram.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
1115
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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
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13 import org.apache.log4j.Logger;
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14
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15 import org.jfree.chart.ChartFactory;
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16 import org.jfree.chart.ChartTheme;
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17 import org.jfree.chart.JFreeChart;
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18
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19 import org.jfree.chart.axis.NumberAxis;
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20 import org.jfree.chart.axis.TickUnitSource;
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21
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22 import org.jfree.chart.plot.PlotOrientation;
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23 import org.jfree.chart.plot.XYPlot;
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24
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25 import org.jfree.chart.renderer.xy.XYBarRenderer;
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26
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27 /**
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28 * This abstract class defines some methods to adjust chart settings after its
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29 * creation.
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30 *
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31 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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32 */
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33 public abstract class AbstractHistogram
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34 implements Chart
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35 {
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36 /**
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37 * Logger used for logging with Apache log4j.
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38 */
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39 private Logger logger = Logger.getLogger(AbstractHistogram.class);
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40
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41 /**
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42 * JFreeChart chart stored at this place after chart creation.
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43 */
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44 protected JFreeChart chart;
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46 /**
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47 * Labels used for chart title, subtitle, axis description.
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48 */
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49 protected ChartLabels labels;
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50
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51 /**
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52 * Theme which is used to adjust the styling of this chart.
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53 */
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54 protected ChartTheme theme;
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55
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56 /**
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57 * Raw data which should be displayed in the chart.
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58 */
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59 protected Object[] data;
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60
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61 /**
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62 * Locale object used for i18n support.
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63 */
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64 protected Locale locale;
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65
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66
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67 /**
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68 * Constructor for creating histogram charts.
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69 *
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70 * @param labels See {@link #labels}
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71 * @param data See {@link #data}
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72 * @param theme See {@link #theme}
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73 */
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74 public AbstractHistogram(
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75 ChartLabels labels, Object[] data, ChartTheme theme
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76 ) {
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77 this.labels = labels;
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78 this.data = data;
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79 this.theme = theme;
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80 }
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81
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82
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83 /**
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84 * @see de.intevation.gnv.chart.Chart#generateChart()
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85 */
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86 public JFreeChart generateChart() {
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87
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88 if (chart != null)
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89 return chart;
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90
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91 chart = ChartFactory.createHistogram(
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92 labels.getTitle(),
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93 labels.getDomainAxisLabel(),
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94 labels.getRangeAxisLabel(),
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95 null,
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96 PlotOrientation.VERTICAL,
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97 true,
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98 false,
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99 false);
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100
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101 applyDatasets();
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102
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103 theme.apply(chart);
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104 adjustPlot();
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105 adjustDomainAxis(chart);
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106 adjustRangeAxis(chart);
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107
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108 return chart;
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109 }
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110
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111
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112 /**
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113 * Method to do some changes in plot settings.
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114 */
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115 protected void adjustPlot() {
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116 XYPlot plot = (XYPlot) chart.getPlot();
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117 XYBarRenderer renderer = (XYBarRenderer) plot.getRenderer();
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118
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119 renderer.setShadowVisible(false);
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120 renderer.setSeriesVisibleInLegend(0, false);
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121 }
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122
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123
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124 protected void adjustDomainAxis(JFreeChart chart) {
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125 XYPlot plot = (XYPlot) chart.getPlot();
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126 NumberAxis domainAxis = (NumberAxis) plot.getDomainAxis();
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127
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128 TickUnitSource tus = domainAxis.createStandardTickUnits(locale);
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129 domainAxis.setStandardTickUnits(tus);
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130 }
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131
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132
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133 protected void adjustRangeAxis(JFreeChart chart) {
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134 XYPlot plot = (XYPlot) chart.getPlot();
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135 NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
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136
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137 TickUnitSource tus = rangeAxis.createStandardTickUnits(locale);
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138 rangeAxis.setStandardTickUnits(tus);
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139 }
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140
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141
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142
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143
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144 /**
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145 * This method needs to be implemented by subclasses and should add valid
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146 * <code>HistogramDataset</code> objects to the created chart. It is called
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147 * by {@link #generateChart} after chart creation.
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148 */
617
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149 protected abstract void applyDatasets();
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150 }
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151 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org