Mercurial > dive4elements > river
annotate artifacts/src/main/java/org/dive4elements/river/exports/ChartExportHelper.java @ 7068:726d998dce29 generator-refactoring
Remove Axis Walker, unabstract Diagram generator
Diagram generator can now be used as an instance configured
in the out-generators config
author | Andre Heinecke <aheinecke@intevation.de> |
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date | Fri, 20 Sep 2013 14:55:44 +0200 |
parents | af13ceeba52a |
children | 1f6c0915a58d |
rev | line source |
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde |
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2 * Software engineering by Intevation GmbH |
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3 * |
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4 * This file is Free Software under the GNU AGPL (>=v3) |
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the |
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6 * documentation coming with Dive4Elements River for details. |
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7 */ |
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8 |
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9 package org.dive4elements.river.exports; |
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10 |
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11 import com.lowagie.text.Document; |
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12 import com.lowagie.text.DocumentException; |
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13 import com.lowagie.text.PageSize; |
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14 import com.lowagie.text.Rectangle; |
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15 |
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16 import com.lowagie.text.pdf.PdfContentByte; |
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17 import com.lowagie.text.pdf.PdfTemplate; |
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18 import com.lowagie.text.pdf.PdfWriter; |
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19 |
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20 import java.awt.Graphics2D; |
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21 import java.awt.Transparency; |
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22 |
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23 import java.awt.geom.Rectangle2D.Double; |
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24 |
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25 import java.awt.geom.Rectangle2D; |
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26 |
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27 import java.io.IOException; |
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28 import java.io.OutputStream; |
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29 import java.io.OutputStreamWriter; |
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30 import java.io.UnsupportedEncodingException; |
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31 import org.jfree.chart.ChartRenderingInfo; |
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32 |
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33 import javax.imageio.ImageIO; |
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34 |
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35 import au.com.bytecode.opencsv.CSVWriter; |
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36 |
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37 import org.apache.batik.svggen.SVGGraphics2D; |
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38 import org.apache.batik.svggen.SVGGraphics2DIOException; |
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39 |
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40 import org.apache.log4j.Logger; |
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41 |
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42 import org.jfree.chart.JFreeChart; |
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43 import org.jfree.chart.plot.XYPlot; |
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44 import org.jfree.data.xy.XYDataset; |
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45 |
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46 import org.dive4elements.artifacts.CallContext; |
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47 |
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48 import org.dive4elements.artifacts.common.utils.XMLUtils; |
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49 |
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50 |
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51 /** |
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52 * This class is a helper class which supports some methods to export charts |
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53 * into specific formats. |
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54 * |
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55 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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56 */ |
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57 public class ChartExportHelper { |
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58 |
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59 public static final String FORMAT_PNG = "png"; |
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60 |
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61 public static final String FORMAT_PDF = "pdf"; |
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62 |
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63 public static final String FORMAT_SVG = "svg"; |
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64 |
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65 public static final String FORMAT_CSV = "csv"; |
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66 |
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67 /** |
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68 * Constant field to define A4 as default page size. |
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69 */ |
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70 public static final String DEFAULT_PAGE_SIZE = "A4"; |
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71 |
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72 /** |
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73 * Constant field to define UTF-8 as default encoding. |
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74 */ |
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75 public static final String DEFAULT_ENCODING = "UTF-8"; |
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76 |
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77 /** The default separator for the CSV export. */ |
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78 public static final char DEFAULT_CSV_SEPARATOR = ','; |
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79 |
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80 |
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81 /** |
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82 * Logger used for logging with log4j. |
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83 */ |
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84 private static Logger log = Logger.getLogger(ChartExportHelper.class); |
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85 |
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86 |
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87 /** |
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88 * A method to export a <code>JFreeChart</code> as image to an |
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89 * <code>OutputStream</code> with a given format, width and height. |
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90 * |
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91 * @param out OutputStream |
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92 * @param chart JFreeChart object to be exported. |
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93 * @param cc context, in which e.g. size is stored. |
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94 * |
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95 * @throws IOException if writing image to OutputStream failed. |
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96 */ |
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97 public static void exportImage( |
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98 OutputStream out, |
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99 JFreeChart chart, |
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100 CallContext cc |
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101 ) |
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102 throws IOException |
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103 { |
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104 log.info("export chart as png"); |
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105 |
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106 ChartRenderingInfo info = new ChartRenderingInfo(); |
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107 |
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108 String format = (String) cc.getContextValue("chart.image.format"); |
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109 |
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110 int[] size = getSize(cc); |
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111 |
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112 ImageIO.write( |
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113 chart.createBufferedImage( |
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114 size[0], size[1], Transparency.BITMASK, info |
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115 ), |
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116 format, |
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117 out |
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118 ); |
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119 } |
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120 |
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121 |
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122 /** |
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123 * A method to export a <code>JFreeChart</code> as SVG to an |
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124 * <code>OutputStream</code>. |
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125 * |
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126 * @param out OutputStream |
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127 * @param chart JFreeChart to be exported |
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128 * @param context The CallContext object that contains extra chart |
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129 * parameters. |
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130 */ |
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131 public static void exportSVG( |
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132 OutputStream out, |
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133 JFreeChart chart, |
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134 CallContext context |
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135 ) { |
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136 String encoding = (String) context.getContextValue("chart.encoding"); |
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137 |
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138 log.info("export chart as svg"); |
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139 |
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140 if (encoding == null) |
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141 encoding = DEFAULT_ENCODING; |
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142 |
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143 org.w3c.dom.Document document = XMLUtils.newDocument(); |
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144 SVGGraphics2D graphics = new SVGGraphics2D(document); |
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145 |
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146 int[] size = getSize(context); |
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147 |
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148 ChartRenderingInfo info = new ChartRenderingInfo(); |
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149 |
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150 chart.draw(graphics, new Rectangle2D.Double(0.0D, 0.0D,size[0],size[1]), info); |
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151 |
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152 try { |
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153 graphics.stream(new OutputStreamWriter(out, encoding)); |
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154 } |
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155 catch (SVGGraphics2DIOException svge) { |
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156 log.error("Error while writing svg export to output stream.", svge); |
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157 } |
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158 catch (UnsupportedEncodingException uee) { |
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159 log.error("Unsupported encoding: " + encoding, uee); |
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160 } |
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161 } |
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162 |
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163 |
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164 /** |
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165 * A method to export a <code>JFreeChart</code> as PDF to an |
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166 * <code>OutputStream</code>. |
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167 * |
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168 * @param out OutputStream |
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169 * @param chart JFreeChart |
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170 */ |
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171 public static void exportPDF( |
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172 OutputStream out, |
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173 JFreeChart chart, |
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174 CallContext cc |
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175 ) { |
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176 log.info("export chart as pdf."); |
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177 |
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178 String pageFormat = (String) cc.getContextValue("chart.page.format"); |
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179 |
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180 if (pageFormat == null) |
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181 pageFormat = DEFAULT_PAGE_SIZE; |
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182 |
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183 // Max size of the chart. |
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184 Rectangle page = PageSize.getRectangle(pageFormat); |
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185 float pageWidth = page.getWidth(); |
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186 float pageHeight = page.getHeight(); |
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187 |
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188 // The chart width. |
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189 int[] size = getSize(cc); |
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190 |
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191 boolean landscape = size[0] > size[1]; |
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192 |
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193 float width = 0; |
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194 float height = 0; |
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195 if (landscape) { |
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196 width = pageHeight; |
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197 height = pageWidth; |
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198 } |
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199 else { |
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200 width = pageWidth; |
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201 height = pageHeight; |
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202 } |
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203 |
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204 float marginLeft = (Float) cc.getContextValue( |
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205 "chart.marginLeft"); |
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206 |
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207 float marginRight = (Float) cc.getContextValue( |
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208 "chart.marginRight"); |
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209 |
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210 float marginTop = (Float) cc.getContextValue( |
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211 "chart.marginTop"); |
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212 |
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213 float marginBottom = (Float) cc.getContextValue( |
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214 "chart.marginBottom"); |
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215 |
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216 float spaceX = width - marginLeft - marginRight; |
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217 if (size[0] > spaceX) { |
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218 log.warn("Width of the chart is too big for pdf -> resize it now."); |
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219 double ratio = ((double)spaceX) / size[0]; |
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220 size[0] *= ratio; |
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221 size[1] *= ratio; |
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222 log.debug("Resized chart to " + size[0] + "x" + size[1]); |
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223 } |
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224 |
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225 float spaceY = height - marginTop - marginBottom; |
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226 if (size[1] > spaceY) { |
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227 log.warn("Height of the chart is too big for pdf -> resize it now."); |
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228 double ratio = ((double)spaceY) / size[1]; |
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229 size[0] *= ratio; |
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230 size[1] *= ratio; |
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231 log.debug("Resized chart to " + size[0] + "x" + size[1]); |
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232 } |
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233 |
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234 Document document = null; |
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235 if (landscape) { |
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236 document = new Document(page.rotate()); |
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237 log.debug("Create landscape pdf."); |
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238 } |
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239 else |
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240 document = new Document(page); |
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241 |
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242 try { |
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243 PdfWriter writer = PdfWriter.getInstance(document, out); |
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244 |
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245 document.addSubject(chart.getTitle().getText()); |
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246 document.addCreationDate(); |
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247 document.open(); |
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248 |
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249 PdfContentByte content = writer.getDirectContent(); |
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250 |
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251 PdfTemplate template = content.createTemplate(width, height); |
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252 Graphics2D graphics = template.createGraphics(width, height); |
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253 |
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254 double[] origin = getCenteredAnchor( |
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255 marginLeft, marginRight, marginBottom, marginTop, |
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256 width, height, |
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257 size[0], size[1]); |
152
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258 |
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259 Rectangle2D area = new Rectangle2D.Double( |
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260 origin[0], origin[1], size[0], size[1]); |
152
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261 |
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262 ChartRenderingInfo info = new ChartRenderingInfo(); |
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263 |
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264 chart.draw(graphics, area, info); |
152
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265 graphics.dispose(); |
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266 content.addTemplate(template, 0f, 0f); |
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267 } |
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268 catch (DocumentException de) { |
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269 log.error("Error while exporting chart to pdf.", de); |
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270 } |
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271 finally { |
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272 document.close(); |
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273 } |
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274 } |
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275 |
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276 |
2231
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277 /** |
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278 * A method to export a CSV file to an |
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279 * <code>OutputStream</code>. |
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280 * |
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281 * @param out OutputStream |
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282 * @param chart JFreeChart containing the data. |
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283 * @param context The CallContext object that contains extra parameters. |
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284 */ |
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285 public static void exportCSV( |
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286 OutputStream out, |
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287 JFreeChart chart, |
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288 CallContext context) |
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289 { |
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290 log.debug("export chart as CSV"); |
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291 CSVWriter writer = null; |
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292 try { |
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293 writer = new CSVWriter( |
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294 new OutputStreamWriter( |
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295 out, |
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296 DEFAULT_ENCODING), |
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297 DEFAULT_CSV_SEPARATOR); |
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298 } |
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299 catch(UnsupportedEncodingException uee) { |
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300 log.warn("Wrong encoding for CSV export."); |
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301 return; |
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302 } |
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303 XYPlot plot = chart.getXYPlot(); |
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304 int count = plot.getDatasetCount(); |
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305 for (int i = 0; i < count; i++) { |
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306 XYDataset data = plot.getDataset(i); |
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307 int scount = data.getSeriesCount(); |
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308 for (int j = 0; j < scount; j++) { |
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309 Comparable seriesKey = data.getSeriesKey(j); |
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310 log.debug("series key: " + seriesKey.toString()); |
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311 writeCSVHeader(writer, seriesKey.toString()); |
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312 writeCSVData(writer, data); |
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313 } |
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314 } |
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315 try { |
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316 writer.close(); |
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317 } |
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318 catch(IOException ioe) { |
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319 log.error("Writing CSV export failed!"); |
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320 } |
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321 } |
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322 |
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323 |
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324 protected static void writeCSVHeader(CSVWriter writer, String key) { |
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325 writer.writeNext(new String[] {"#"}); |
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326 writer.writeNext(new String[] {"# " + key}); |
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327 writer.writeNext(new String[] {"#"}); |
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328 writer.writeNext(new String[] {"X", "Y"}); |
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329 } |
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330 |
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331 |
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332 protected static void writeCSVData(CSVWriter writer, XYDataset data) { |
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333 int series = data.getSeriesCount(); |
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334 for (int i = 0; i < series; i++) { |
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335 int items = data.getItemCount(i); |
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336 for (int j = 0; j < items; j++) { |
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337 log.debug("write data: " + data.getX(i, j) + ", " + data.getY(i, j)); |
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338 writer.writeNext(new String[] { |
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339 data.getX(i, j).toString(), |
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340 data.getY(i, j).toString()}); |
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341 } |
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342 } |
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343 } |
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344 |
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345 |
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346 public static int[] getSize(CallContext cc) { |
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347 int[] size = new int[2]; |
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348 |
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349 size[0] = (Integer) cc.getContextValue("chart.width"); |
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350 size[1] = (Integer) cc.getContextValue("chart.height"); |
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351 |
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352 return size; |
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353 } |
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354 |
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355 |
152
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356 /** |
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357 * This method returns the anchor of the chart so that the chart is centered |
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358 * according to the given parameters. |
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359 * |
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360 * @param mLeft Left margin |
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361 * @param mRight Right margin |
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362 * @param mBottom Bottom margin |
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363 * @param mTop Top margin |
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364 * @param width The complete width of the drawing area. |
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365 * @param height The complete height of the drawing area. |
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366 * @param chartWidth The width of the chart. |
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367 * @param chartHeight The height of the chart. |
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368 * |
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369 * @return an array that contains the anchor for a chart with the given |
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370 * parameters. The first value is the x point, the second value is the y |
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371 * point. |
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372 */ |
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373 public static double[] getCenteredAnchor( |
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374 double mLeft, double mRight, double mBottom, double mTop, |
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375 double width, double height, |
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376 double chartWidth, double chartHeight |
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377 ) { |
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378 if (log.isDebugEnabled()) { |
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379 log.debug("Calculate centered origin..."); |
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380 log.debug("-> PDF width : " + width); |
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381 log.debug("-> PDF height : " + height); |
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382 log.debug("-> Chart width : " + chartWidth); |
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383 log.debug("-> Chart height : " + chartHeight); |
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384 log.debug("-> margin left : " + mLeft); |
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385 log.debug("-> margin right : " + mRight); |
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386 log.debug("-> margin bottom: " + mBottom); |
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387 log.debug("-> margin top : " + mTop); |
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388 } |
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389 |
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390 double[] origin = new double[2]; |
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391 |
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392 double centerX = width / 2; |
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393 double centerY = height / 2; |
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394 |
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395 origin[0] = centerX - chartWidth / 2; |
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396 origin[1] = centerY - chartHeight / 2; |
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397 |
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398 origin[0] = origin[0] >= mLeft ? origin[0] : mLeft; |
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399 origin[1] = origin[1] >= mTop ? origin[1] : mTop; |
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400 |
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401 if (log.isDebugEnabled()) { |
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402 log.debug("==> centered left origin: " + origin[0]); |
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403 log.debug("==> centered top origin: " + origin[1]); |
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404 } |
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405 |
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406 return origin; |
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407 } |
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408 } |
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409 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 : |