Mercurial > dive4elements > gnv-client
annotate gnv-artifacts/src/main/java/de/intevation/gnv/exports/ChartExportHelper.java @ 778:9a828e5a2390
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gnv-artifacts/trunk@851 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Mon, 29 Mar 2010 07:58:51 +0000 |
parents | a0e63136954e |
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1 package de.intevation.gnv.exports; |
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2 |
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3 import com.lowagie.text.Document; |
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4 import com.lowagie.text.DocumentException; |
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5 import com.lowagie.text.PageSize; |
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6 import com.lowagie.text.Rectangle; |
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7 |
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8 import com.lowagie.text.pdf.PdfContentByte; |
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9 import com.lowagie.text.pdf.PdfTemplate; |
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10 import com.lowagie.text.pdf.PdfWriter; |
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11 |
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12 import de.intevation.artifactdatabase.XMLUtils; |
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13 |
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14 import de.intevation.gnv.chart.Chart; |
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15 |
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16 import java.awt.Graphics2D; |
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17 import java.awt.Transparency; |
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18 |
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19 import java.awt.geom.Rectangle2D.Double; |
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20 |
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21 import java.awt.geom.Rectangle2D; |
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22 |
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23 import java.awt.image.BufferedImage; |
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24 |
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25 import java.io.IOException; |
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26 import java.io.OutputStream; |
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27 import java.io.OutputStreamWriter; |
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28 import java.io.UnsupportedEncodingException; |
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29 |
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30 import javax.imageio.ImageIO; |
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31 |
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32 import org.apache.batik.svggen.SVGGraphics2D; |
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33 import org.apache.batik.svggen.SVGGraphics2DIOException; |
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34 |
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35 import org.apache.log4j.Logger; |
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36 |
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37 import org.jfree.chart.JFreeChart; |
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38 |
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39 /** |
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40 * This class is a helper class which supports some methods to export charts |
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41 * into specific formats. |
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42 * |
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43 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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44 */ |
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45 public class ChartExportHelper { |
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46 |
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47 /** |
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48 * Constant field to define A4 as default page size. |
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49 */ |
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50 private static final String DEFAULT_PAGE_SIZE = "A4"; |
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51 |
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52 /** |
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53 * Constant field to define UTF-8 as default encoding. |
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54 */ |
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55 private static final String DEFAULT_ENCODING = "UTF-8"; |
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56 |
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57 /** |
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58 * Logger used for logging with log4j. |
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59 */ |
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60 private static Logger log = Logger.getLogger(ChartExportHelper.class); |
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61 |
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62 |
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63 /** |
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64 * A method to export a <code>JFreeChart</code> as image to an |
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65 * <code>OutputStream</code> with a given format, width and height. |
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66 * |
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67 * @param out OutputStream |
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68 * @param JFreeChart Chart to be exported |
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69 * @param format Format (e.g. png, gif, jpg) |
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70 * @param width Width, the image used to be |
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71 * @param height Height, the image used to be |
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72 * |
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73 * @throws IOException if writing image to OutputStream failed. |
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74 */ |
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75 public static void exportImage( |
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76 OutputStream out, |
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77 JFreeChart chart, |
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78 String format, |
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79 int width, |
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80 int height |
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81 ) |
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82 throws IOException |
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83 { |
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84 log.info("export chart as png"); |
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85 |
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86 ImageIO.write( |
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87 chart.createBufferedImage( |
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88 width, height, Transparency.BITMASK, null |
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89 ), |
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90 format, |
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91 out |
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92 ); |
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93 } |
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94 |
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95 |
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96 /** |
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97 * A method to export a <code>JFreeChart</code> histogram as image to an |
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98 * <code>OutputStream</code> with a given format, width and height. |
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99 * |
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100 * @param out OutputStream |
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101 * @param histograms Array of {@link de.intevation.gnv.chart.Chart} objects |
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102 * @param format A format (e.g. png, gif, jpg) |
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103 * @param width Width the image used to be |
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104 * @param height Height the image used to be |
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105 * |
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106 * @throws IOException if writing image to OutputStream failed. |
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107 */ |
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108 public static void exportHistograms( |
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109 OutputStream out, |
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110 Chart[] histograms, |
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111 String format, |
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112 int width, |
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113 int height) |
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114 throws IOException |
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115 { |
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116 log.info("export histograms"); |
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117 |
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118 int size = histograms.length; |
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119 BufferedImage image = new BufferedImage( |
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120 width, height*size, BufferedImage.TYPE_INT_RGB); |
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121 Graphics2D g = image.createGraphics(); |
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122 |
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123 for (int i = 0; i < size; i++) { |
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124 JFreeChart chart = histograms[i].generateChart(); |
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125 chart.draw(g, new Rectangle2D.Double(0.0D, i*height, width, height)); |
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126 } |
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127 g.finalize(); |
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128 |
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129 ImageIO.write(image, format, out); |
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130 } |
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131 |
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132 |
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133 /** |
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134 * A method to export a <code>JFreeChart</code> histogram as SVG to an |
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135 * <code>OutputStream</code>. |
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136 * |
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137 * @param out OutputStream |
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138 * @param histograms Array of {@link de.intevation.gnv.chart.Chart} |
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139 * @param encoding Encoding, defaults to {@link DEFAULT_ENCODING} if null |
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140 * @param width Width the svg used to be |
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141 * @param height Height the svg used to be |
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142 */ |
639
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143 public static void exportHistogramsAsSVG( |
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144 OutputStream out, |
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145 Chart[] histograms, |
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146 String encoding, |
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147 int width, |
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148 int height |
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149 ) { |
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150 log.info("export histograms as svg"); |
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151 |
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152 if (encoding == null) |
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153 encoding = DEFAULT_ENCODING; |
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154 |
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155 org.w3c.dom.Document document = XMLUtils.newDocument(); |
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156 SVGGraphics2D graphics = new SVGGraphics2D(document); |
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157 |
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158 int size = histograms.length; |
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159 for (int i = 0; i < size; i++) { |
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160 JFreeChart chart = histograms[i].generateChart(); |
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161 chart.draw(graphics, new Rectangle2D.Double( |
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162 0.0D, i*height,width,height)); |
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163 } |
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164 graphics.finalize(); |
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165 |
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166 try { |
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167 graphics.stream(new OutputStreamWriter(out, encoding)); |
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168 } |
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169 catch (SVGGraphics2DIOException svge) { |
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170 log.error("Error while writing svg export to output stream.", svge); |
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171 } |
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172 catch (UnsupportedEncodingException uee) { |
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173 log.error("Unsupported encoding: " + encoding, uee); |
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174 } |
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175 } |
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176 |
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177 |
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178 /** |
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179 * A method to export a <code>JFreeChart</code> as SVG to an |
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180 * <code>OutputStream</code>. |
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181 * |
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182 * @param out OutputStream |
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183 * @param chart JFreeChart to be exported |
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184 * @param encoding Encoding, defaults to {@link DEFAULT_ENCODING} if null |
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185 * @param width Width the svg used to be |
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186 * @param height Height the svg used to be |
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187 */ |
321
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188 public static void exportSVG( |
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189 OutputStream out, |
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190 JFreeChart chart, |
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191 String encoding, |
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192 int width, |
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193 int height |
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194 ) { |
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195 log.info("export chart as svg"); |
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196 |
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197 if (encoding == null) |
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198 encoding = DEFAULT_ENCODING; |
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199 |
323
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200 org.w3c.dom.Document document = XMLUtils.newDocument(); |
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201 SVGGraphics2D graphics = new SVGGraphics2D(document); |
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202 |
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203 chart.draw(graphics, new Rectangle2D.Double(0.0D, 0.0D,width,height)); |
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204 |
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205 try { |
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206 graphics.stream(new OutputStreamWriter(out, encoding)); |
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207 } |
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208 catch (SVGGraphics2DIOException svge) { |
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209 log.error("Error while writing svg export to output stream.", svge); |
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210 } |
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211 catch (UnsupportedEncodingException uee) { |
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212 log.error("Unsupported encoding: " + encoding, uee); |
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213 } |
318
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214 } |
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215 |
320
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216 |
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217 /** |
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218 * A method to export a <code>JFreeChart</code> as PDF to an |
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219 * <code>OutputStream</code>. |
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220 * |
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221 * @param out OutputStream |
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222 * @param chart JFreeChart |
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223 * @param pageFormat String to specify a page format, {@link |
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224 * DEFAULT_PAGE_SIZE} is used if no pageFormat is given |
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225 * @param landscape If this is true, the pdf is delivered in landscape |
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226 * format |
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227 * @param marginLeft Space to left border |
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228 * @param marginRight Space to right border |
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229 * @param marginTop Space to upper border |
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230 * @param marginBottom Space to lower border |
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231 */ |
320
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232 public static void exportPDF( |
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233 OutputStream out, |
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234 JFreeChart chart, |
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235 String pageFormat, |
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236 boolean landscape, |
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237 float marginLeft, |
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238 float marginRight, |
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239 float marginTop, |
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240 float marginBottom |
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241 ) { |
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242 log.info("export chart as pdf."); |
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243 |
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244 if (pageFormat == null) |
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245 pageFormat = DEFAULT_PAGE_SIZE; |
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246 |
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247 Rectangle page = PageSize.getRectangle(pageFormat); |
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248 int pageWidth = (int) (page.getRight(marginRight) - page.getLeft(marginLeft)); |
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249 int pageHeight = (int) (page.getTop(marginTop) - page.getBottom(marginBottom)); |
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250 |
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251 Document document = null; |
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252 if (landscape) { |
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253 document = new Document(page.rotate()); |
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254 log.debug("Create landscape pdf."); |
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255 } |
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256 else |
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257 document = new Document(page); |
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258 |
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259 try { |
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260 PdfWriter writer = PdfWriter.getInstance(document, out); |
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261 |
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262 document.addSubject(chart.getTitle().getText()); |
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263 document.addCreationDate(); |
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264 document.open(); |
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265 |
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266 PdfContentByte content = writer.getDirectContent(); |
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267 |
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268 int width = 0; |
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269 int height = 0; |
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270 if (landscape) { |
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271 width = pageHeight; |
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272 height = pageWidth; |
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273 } |
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274 else { |
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275 width = pageWidth; |
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276 height = pageHeight; |
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277 } |
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278 |
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279 PdfTemplate template = content.createTemplate(width, height); |
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280 Graphics2D graphics = template.createGraphics(width, height); |
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281 Rectangle2D area = new Rectangle2D.Double(0.0D, 0.0D,width,height); |
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282 |
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283 chart.draw(graphics, area); |
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284 graphics.dispose(); |
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285 content.addTemplate(template, marginLeft, marginBottom); |
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286 } |
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287 catch (DocumentException de) { |
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288 log.error("Error while exporting chart to pdf.", de); |
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289 } |
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290 finally { |
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291 document.close(); |
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292 } |
318
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293 } |
640
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294 |
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295 |
771
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296 /** |
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297 * A method to export <code>JFreeChart</code> histograms as PDF to an |
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298 * <code>OutputStream</code>. Each histogram contained in histograms is |
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299 * drawn to an own page in the resulting pdf. |
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300 * |
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301 * @param out OutputStream |
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302 * @param histograms JFreeChart histograms |
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303 * @param pageFormat String to specify a page format, {@link |
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304 * DEFAULT_PAGE_SIZE} is used if no pageFormat is given |
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305 * @param landscape If this is true, the pdf is delivered in landscape |
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306 * format |
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307 * @param marginLeft Space to left border |
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308 * @param marginRight Space to right border |
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309 * @param marginTop Space to upper border |
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310 * @param marginBottom Space to lower border |
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311 */ |
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312 public static void exportHistogramsAsPDF( |
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313 OutputStream out, |
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314 Chart[] histograms, |
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315 String pageFormat, |
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316 boolean landscape, |
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317 float marginLeft, |
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318 float marginRight, |
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319 float marginTop, |
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320 float marginBottom |
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321 ) { |
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322 log.info("export histogram as pdf."); |
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323 |
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324 if (pageFormat == null) |
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325 pageFormat = DEFAULT_PAGE_SIZE; |
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326 |
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327 Rectangle page = PageSize.getRectangle(pageFormat); |
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328 int pageWidth = |
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329 (int) (page.getRight(marginRight) - page.getLeft(marginLeft)); |
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330 int pageHeight = |
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331 (int) (page.getTop(marginTop) - page.getBottom(marginBottom)); |
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332 |
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333 Document document = null; |
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334 if (landscape) { |
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335 document = new Document(page.rotate()); |
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336 log.debug("Create landscape pdf."); |
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337 } |
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338 else |
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339 document = new Document(page); |
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340 |
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341 try { |
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342 PdfWriter writer = PdfWriter.getInstance(document, out); |
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343 |
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344 document.addCreationDate(); |
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345 document.open(); |
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346 |
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347 PdfContentByte content = writer.getDirectContent(); |
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348 |
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349 int width = 0; |
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350 int height = 0; |
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351 if (landscape) { |
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352 width = pageHeight; |
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353 height = pageWidth; |
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354 } |
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355 else { |
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356 width = pageWidth; |
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357 height = pageHeight; |
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358 } |
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359 |
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360 int size = histograms.length; |
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361 for (int i = 0; i < size; i++) { |
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362 if (i > 0) { |
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363 document.newPage(); |
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364 } |
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365 |
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366 JFreeChart chart = histograms[i].generateChart(); |
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367 PdfTemplate template = content.createTemplate(width, height); |
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368 Graphics2D graphics = template.createGraphics(width, height); |
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369 Rectangle2D area = new Rectangle2D.Double( |
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370 0.0D, 0.0D,width,height); |
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371 |
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372 chart.draw(graphics, area); |
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373 graphics.dispose(); |
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374 content.addTemplate(template, marginLeft, marginBottom); |
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375 } |
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376 } |
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377 catch (DocumentException de) { |
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378 log.error("Error while exporting chart to pdf.", de); |
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379 } |
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380 finally { |
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381 document.close(); |
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382 } |
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383 } |
318
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384 } |
320
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385 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 : |