Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/exports/XYChartGenerator.java @ 652:8fa4c5c9cd1a
Charts are zoomed to a specified view if the attribute document for the chart creation contains an x and/or y range.
flys-artifacts/trunk@2047 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Fri, 03 Jun 2011 06:47:51 +0000 |
parents | bab867fb37e8 |
children | 67c7020f4ed3 |
rev | line source |
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1 package de.intevation.flys.exports; |
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2 |
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3 import java.awt.BasicStroke; |
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4 import java.awt.Color; |
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5 import java.awt.Stroke; |
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6 |
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7 import java.io.IOException; |
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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.ChartFactory; |
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12 import org.jfree.chart.JFreeChart; |
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13 import org.jfree.chart.axis.NumberAxis; |
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14 import org.jfree.chart.axis.ValueAxis; |
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15 import org.jfree.chart.plot.PlotOrientation; |
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16 import org.jfree.chart.plot.XYPlot; |
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17 import org.jfree.data.Range; |
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18 |
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19 import de.intevation.flys.exports.ChartExportHelper; |
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20 |
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21 |
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22 /** |
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23 * An abstract base class for creating XY charts. |
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24 * |
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25 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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26 */ |
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27 public abstract class XYChartGenerator extends ChartGenerator { |
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28 |
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29 /** The logger that is used in this generator.*/ |
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30 private static Logger logger = Logger.getLogger(ChartGenerator.class); |
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31 |
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32 |
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33 public static final Color DEFAULT_GRID_COLOR = Color.GRAY; |
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34 public static final float DEFAULT_GRID_LINE_WIDTH = 0.3f; |
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35 |
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36 |
369
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37 /** |
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38 * Returns the title of a chart. |
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39 * |
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40 * @return the title of a chart. |
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41 */ |
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42 protected abstract String getChartTitle(); |
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43 |
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44 /** |
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45 * Returns the X-Axis label of a chart. |
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46 * |
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47 * @return the X-Axis label of a chart. |
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48 */ |
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49 protected abstract String getXAxisLabel(); |
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50 |
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51 /** |
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52 * Returns the Y-Axis label of a chart. |
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53 * |
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54 * @return the Y-Axis label of a chart. |
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55 */ |
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56 protected abstract String getYAxisLabel(); |
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57 |
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58 /** |
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59 * This method is called to add all datasets of a concrete XYChartGenerator |
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60 * to the JFreeChart. |
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61 * |
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62 * @param chart The JFreeChart object. |
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63 */ |
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64 protected abstract void addDatasets(JFreeChart chart); |
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65 |
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66 |
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67 public void generate() |
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68 throws IOException |
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69 { |
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70 logger.debug("XYChartGenerator.generate"); |
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71 |
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72 JFreeChart chart = ChartFactory.createXYLineChart( |
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73 getChartTitle(), |
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74 getXAxisLabel(), |
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75 getYAxisLabel(), |
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76 null, |
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77 PlotOrientation.VERTICAL, |
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78 true, |
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79 false, |
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80 false); |
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81 |
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82 chart.setBackgroundPaint(Color.WHITE); |
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83 chart.getPlot().setBackgroundPaint(Color.WHITE); |
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84 |
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85 XYPlot plot = (XYPlot) chart.getPlot(); |
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86 |
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87 addDatasets(chart); |
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88 addSubtitles(chart); |
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89 adjustPlot(plot); |
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90 adjustAxes(plot); |
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91 |
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92 int[] size = getSize(); |
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93 |
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94 zoom(plot); |
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95 |
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96 ChartExportHelper.exportImage( |
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97 out, |
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98 chart, |
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99 "png", |
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100 size[0], size[1]); |
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101 } |
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102 |
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103 |
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104 protected void zoom(XYPlot plot) { |
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105 logger.debug("Zoom to specified ranges."); |
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106 |
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107 Range xrange = getDomainAxisRange(); |
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108 if (xrange != null) { |
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109 ValueAxis xaxis = plot.getDomainAxis(); |
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110 xaxis.setRange(xrange); |
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111 |
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112 logger.debug("Zoom chart to X: " + xrange); |
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113 } |
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114 |
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115 Range yrange = getValueAxisRange(); |
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116 if (yrange != null) { |
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117 ValueAxis yaxis = plot.getRangeAxis(); |
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118 yaxis.setRange(yrange); |
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119 |
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120 logger.debug("Zoom chart to Y: " + yrange); |
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121 } |
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122 } |
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123 |
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124 |
369
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125 /** |
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126 * Adjusts the axes of a plot. |
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127 * |
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128 * @param plot The XYPlot of the chart. |
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129 */ |
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130 protected void adjustAxes(XYPlot plot) { |
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131 NumberAxis yAxis = (NumberAxis) plot.getRangeAxis(); |
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132 |
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133 yAxis.setAutoRangeIncludesZero(false); |
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134 } |
414
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135 |
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136 |
419
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137 protected void adjustPlot(XYPlot plot) { |
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138 Stroke gridStroke = new BasicStroke( |
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139 DEFAULT_GRID_LINE_WIDTH, |
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140 BasicStroke.CAP_BUTT, |
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141 BasicStroke.JOIN_MITER, |
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142 3.0f, |
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143 new float[] { 3.0f }, |
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144 0.0f); |
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145 |
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146 plot.setDomainGridlineStroke(gridStroke); |
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147 plot.setDomainGridlinePaint(DEFAULT_GRID_COLOR); |
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148 plot.setDomainGridlinesVisible(true); |
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149 |
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150 plot.setRangeGridlineStroke(gridStroke); |
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151 plot.setRangeGridlinePaint(DEFAULT_GRID_COLOR); |
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152 plot.setRangeGridlinesVisible(true); |
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153 } |
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154 |
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155 |
414
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156 protected void addSubtitles(JFreeChart chart) { |
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157 // override this method in subclasses that need subtitles |
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158 } |
369
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159 } |
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160 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |