Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/exports/ChartExportHelper.java @ 3611:a74bdd032cf7
FixA: Changed sector average form point to line in delta W(t) chart.
flys-artifacts/trunk@5240 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Raimund Renkert <raimund.renkert@intevation.de> |
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date | Thu, 23 Aug 2012 09:09:51 +0000 |
parents | d9af29a4bb85 |
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rev | line source |
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1 /* |
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2 * Copyright (c) 2011 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 package de.intevation.flys.exports; |
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9 |
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10 import com.lowagie.text.Document; |
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11 import com.lowagie.text.DocumentException; |
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12 import com.lowagie.text.PageSize; |
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13 import com.lowagie.text.Rectangle; |
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14 |
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15 import com.lowagie.text.pdf.PdfContentByte; |
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16 import com.lowagie.text.pdf.PdfTemplate; |
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17 import com.lowagie.text.pdf.PdfWriter; |
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18 |
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19 import java.awt.Graphics2D; |
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20 import java.awt.Transparency; |
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21 |
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22 import java.awt.geom.Rectangle2D.Double; |
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23 |
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24 import java.awt.geom.Rectangle2D; |
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25 |
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26 import java.io.IOException; |
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27 import java.io.OutputStream; |
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28 import java.io.OutputStreamWriter; |
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29 import java.io.UnsupportedEncodingException; |
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30 import org.jfree.chart.ChartRenderingInfo; |
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31 |
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32 import javax.imageio.ImageIO; |
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33 |
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34 import au.com.bytecode.opencsv.CSVWriter; |
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35 |
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36 import org.apache.batik.svggen.SVGGraphics2D; |
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37 import org.apache.batik.svggen.SVGGraphics2DIOException; |
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38 |
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39 import org.apache.log4j.Logger; |
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40 |
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41 import org.jfree.chart.JFreeChart; |
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42 import org.jfree.chart.plot.XYPlot; |
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43 import org.jfree.data.xy.XYDataset; |
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44 |
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45 import de.intevation.artifacts.CallContext; |
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46 |
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47 import de.intevation.artifacts.common.utils.XMLUtils; |
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48 |
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49 |
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50 /** |
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51 * This class is a helper class which supports some methods to export charts |
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52 * into specific formats. |
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53 * |
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54 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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55 */ |
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56 public class ChartExportHelper { |
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57 |
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58 public static final String FORMAT_PNG = "png"; |
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59 |
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60 public static final String FORMAT_PDF = "pdf"; |
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61 |
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62 public static final String FORMAT_SVG = "svg"; |
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63 |
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64 public static final String FORMAT_CSV = "csv"; |
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65 |
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66 /** |
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67 * Constant field to define A4 as default page size. |
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68 */ |
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69 public static final String DEFAULT_PAGE_SIZE = "A4"; |
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70 |
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71 /** |
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72 * Constant field to define UTF-8 as default encoding. |
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73 */ |
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74 public static final String DEFAULT_ENCODING = "UTF-8"; |
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75 |
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76 /** The default separator for the CSV export. */ |
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77 public static final char DEFAULT_CSV_SEPARATOR = ','; |
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78 |
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79 |
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80 /** |
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81 * Logger used for logging with log4j. |
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82 */ |
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83 private static Logger log = Logger.getLogger(ChartExportHelper.class); |
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84 |
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85 |
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86 /** |
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87 * A method to export a <code>JFreeChart</code> as image to an |
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88 * <code>OutputStream</code> with a given format, width and height. |
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89 * |
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90 * @param out OutputStream |
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91 * @param chart JFreeChart object to be exported. |
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92 * @param cc context, in which e.g. size is stored. |
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93 * |
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94 * @throws IOException if writing image to OutputStream failed. |
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95 */ |
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96 public static void exportImage( |
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97 OutputStream out, |
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98 JFreeChart chart, |
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99 CallContext cc |
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100 ) |
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101 throws IOException |
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102 { |
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103 log.info("export chart as png"); |
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104 |
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105 ChartRenderingInfo info = new ChartRenderingInfo(); |
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106 |
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107 String format = (String) cc.getContextValue("chart.image.format"); |
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108 |
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109 int[] size = getSize(cc); |
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110 |
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111 ImageIO.write( |
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112 chart.createBufferedImage( |
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113 size[0], size[1], Transparency.BITMASK, info |
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114 ), |
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115 format, |
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116 out |
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117 ); |
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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 * A method to export a <code>JFreeChart</code> as SVG to an |
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123 * <code>OutputStream</code>. |
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124 * |
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125 * @param out OutputStream |
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126 * @param chart JFreeChart to be exported |
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127 * @param context The CallContext object that contains extra chart |
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128 * parameters. |
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129 */ |
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130 public static void exportSVG( |
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131 OutputStream out, |
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132 JFreeChart chart, |
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133 CallContext context |
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134 ) { |
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135 String encoding = (String) context.getContextValue("chart.encoding"); |
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136 |
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137 log.info("export chart as svg"); |
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138 |
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139 if (encoding == null) |
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140 encoding = DEFAULT_ENCODING; |
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141 |
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142 org.w3c.dom.Document document = XMLUtils.newDocument(); |
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143 SVGGraphics2D graphics = new SVGGraphics2D(document); |
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144 |
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145 int[] size = getSize(context); |
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146 |
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147 ChartRenderingInfo info = new ChartRenderingInfo(); |
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148 |
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149 chart.draw(graphics, new Rectangle2D.Double(0.0D, 0.0D,size[0],size[1]), info); |
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150 |
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151 try { |
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152 graphics.stream(new OutputStreamWriter(out, encoding)); |
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153 } |
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154 catch (SVGGraphics2DIOException svge) { |
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155 log.error("Error while writing svg export to output stream.", svge); |
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156 } |
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157 catch (UnsupportedEncodingException uee) { |
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158 log.error("Unsupported encoding: " + encoding, uee); |
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159 } |
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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 * A method to export a <code>JFreeChart</code> as PDF to an |
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165 * <code>OutputStream</code>. |
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166 * |
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167 * @param out OutputStream |
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168 * @param chart JFreeChart |
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169 */ |
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170 public static void exportPDF( |
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171 OutputStream out, |
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172 JFreeChart chart, |
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173 CallContext cc |
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174 ) { |
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175 log.info("export chart as pdf."); |
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176 |
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177 String pageFormat = (String) cc.getContextValue("chart.page.format"); |
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178 |
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179 if (pageFormat == null) |
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180 pageFormat = DEFAULT_PAGE_SIZE; |
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181 |
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182 // Max size of the chart. |
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183 Rectangle page = PageSize.getRectangle(pageFormat); |
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184 float pageWidth = page.getWidth(); |
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185 float pageHeight = page.getHeight(); |
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186 |
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187 // The chart width. |
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188 int[] size = getSize(cc); |
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189 |
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190 boolean landscape = size[0] > size[1]; |
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191 |
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192 float width = 0; |
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193 float height = 0; |
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194 if (landscape) { |
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195 width = pageHeight; |
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196 height = pageWidth; |
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197 } |
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198 else { |
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199 width = pageWidth; |
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200 height = pageHeight; |
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201 } |
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202 |
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203 float marginLeft = (Float) cc.getContextValue( |
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204 "chart.marginLeft"); |
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205 |
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206 float marginRight = (Float) cc.getContextValue( |
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207 "chart.marginRight"); |
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208 |
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209 float marginTop = (Float) cc.getContextValue( |
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210 "chart.marginTop"); |
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211 |
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212 float marginBottom = (Float) cc.getContextValue( |
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213 "chart.marginBottom"); |
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214 |
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215 float spaceX = width - marginLeft - marginRight; |
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216 if (size[0] > spaceX) { |
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217 log.warn("Width of the chart is too big for pdf -> resize it now."); |
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218 double ratio = ((double)spaceX) / size[0]; |
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219 size[0] *= ratio; |
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220 size[1] *= ratio; |
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221 log.debug("Resized chart to " + size[0] + "x" + size[1]); |
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222 } |
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223 |
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224 float spaceY = height - marginTop - marginBottom; |
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225 if (size[1] > spaceY) { |
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226 log.warn("Height of the chart is too big for pdf -> resize it now."); |
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227 double ratio = ((double)spaceY) / size[1]; |
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228 size[0] *= ratio; |
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229 size[1] *= ratio; |
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230 log.debug("Resized chart to " + size[0] + "x" + size[1]); |
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231 } |
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232 |
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233 Document document = null; |
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234 if (landscape) { |
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235 document = new Document(page.rotate()); |
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236 log.debug("Create landscape pdf."); |
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237 } |
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238 else |
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239 document = new Document(page); |
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240 |
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241 try { |
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242 PdfWriter writer = PdfWriter.getInstance(document, out); |
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243 |
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244 document.addSubject(chart.getTitle().getText()); |
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245 document.addCreationDate(); |
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246 document.open(); |
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247 |
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248 PdfContentByte content = writer.getDirectContent(); |
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249 |
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250 PdfTemplate template = content.createTemplate(width, height); |
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251 Graphics2D graphics = template.createGraphics(width, height); |
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252 |
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253 double[] origin = getCenteredAnchor( |
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254 marginLeft, marginRight, marginBottom, marginTop, |
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255 width, height, |
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256 size[0], size[1]); |
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257 |
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258 Rectangle2D area = new Rectangle2D.Double( |
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259 origin[0], origin[1], size[0], size[1]); |
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260 |
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261 ChartRenderingInfo info = new ChartRenderingInfo(); |
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262 |
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263 chart.draw(graphics, area, info); |
152
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264 graphics.dispose(); |
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265 content.addTemplate(template, 0f, 0f); |
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266 } |
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267 catch (DocumentException de) { |
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268 log.error("Error while exporting chart to pdf.", de); |
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269 } |
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270 finally { |
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271 document.close(); |
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272 } |
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273 } |
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274 |
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275 |
2231
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276 /** |
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277 * A method to export a CSV file to an |
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278 * <code>OutputStream</code>. |
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279 * |
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280 * @param out OutputStream |
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281 * @param chart JFreeChart containing the data. |
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282 * @param context The CallContext object that contains extra parameters. |
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283 */ |
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284 public static void exportCSV( |
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285 OutputStream out, |
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286 JFreeChart chart, |
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287 CallContext context) |
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288 { |
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289 log.debug("export chart as CSV"); |
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290 CSVWriter writer = null; |
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291 try { |
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292 writer = new CSVWriter( |
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293 new OutputStreamWriter( |
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294 out, |
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295 DEFAULT_ENCODING), |
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296 DEFAULT_CSV_SEPARATOR); |
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297 } |
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298 catch(UnsupportedEncodingException uee) { |
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299 log.warn("Wrong encoding for CSV export."); |
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300 return; |
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301 } |
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302 XYPlot plot = chart.getXYPlot(); |
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303 int count = plot.getDatasetCount(); |
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304 for (int i = 0; i < count; i++) { |
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305 XYDataset data = plot.getDataset(i); |
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306 int scount = data.getSeriesCount(); |
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307 for (int j = 0; j < scount; j++) { |
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308 Comparable seriesKey = data.getSeriesKey(j); |
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309 log.debug("series key: " + seriesKey.toString()); |
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310 writeCSVHeader(writer, seriesKey.toString()); |
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311 writeCSVData(writer, data); |
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312 } |
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313 } |
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314 try { |
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315 writer.close(); |
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316 } |
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317 catch(IOException ioe) { |
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318 log.error("Writing CSV export failed!"); |
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319 } |
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320 } |
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321 |
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322 |
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323 protected static void writeCSVHeader(CSVWriter writer, String key) { |
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324 writer.writeNext(new String[] {"#"}); |
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325 writer.writeNext(new String[] {"# " + key}); |
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326 writer.writeNext(new String[] {"#"}); |
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327 writer.writeNext(new String[] {"X", "Y"}); |
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328 } |
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329 |
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330 |
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331 protected static void writeCSVData(CSVWriter writer, XYDataset data) { |
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332 int series = data.getSeriesCount(); |
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333 for (int i = 0; i < series; i++) { |
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334 int items = data.getItemCount(i); |
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335 for (int j = 0; j < items; j++) { |
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336 log.debug("write data: " + data.getX(i, j) + ", " + data.getY(i, j)); |
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337 writer.writeNext(new String[] { |
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338 data.getX(i, j).toString(), |
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339 data.getY(i, j).toString()}); |
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340 } |
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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 public static int[] getSize(CallContext cc) { |
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346 int[] size = new int[2]; |
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347 |
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348 size[0] = (Integer) cc.getContextValue("chart.width"); |
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349 size[1] = (Integer) cc.getContextValue("chart.height"); |
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350 |
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351 return size; |
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352 } |
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353 |
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354 |
152
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355 /** |
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356 * This method returns the anchor of the chart so that the chart is centered |
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357 * according to the given parameters. |
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358 * |
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359 * @param mLeft Left margin |
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360 * @param mRight Right margin |
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361 * @param mBottom Bottom margin |
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362 * @param mTop Top margin |
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363 * @param width The complete width of the drawing area. |
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364 * @param height The complete height of the drawing area. |
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365 * @param chartWidth The width of the chart. |
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366 * @param chartHeight The height of the chart. |
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367 * |
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368 * @return an array that contains the anchor for a chart with the given |
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369 * parameters. The first value is the x point, the second value is the y |
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370 * point. |
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371 */ |
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372 public static double[] getCenteredAnchor( |
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373 double mLeft, double mRight, double mBottom, double mTop, |
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374 double width, double height, |
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375 double chartWidth, double chartHeight |
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376 ) { |
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377 if (log.isDebugEnabled()) { |
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378 log.debug("Calculate centered origin..."); |
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379 log.debug("-> PDF width : " + width); |
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380 log.debug("-> PDF height : " + height); |
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381 log.debug("-> Chart width : " + chartWidth); |
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382 log.debug("-> Chart height : " + chartHeight); |
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383 log.debug("-> margin left : " + mLeft); |
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384 log.debug("-> margin right : " + mRight); |
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385 log.debug("-> margin bottom: " + mBottom); |
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386 log.debug("-> margin top : " + mTop); |
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387 } |
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388 |
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389 double[] origin = new double[2]; |
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390 |
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391 double centerX = width / 2; |
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392 double centerY = height / 2; |
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393 |
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394 origin[0] = centerX - chartWidth / 2; |
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395 origin[1] = centerY - chartHeight / 2; |
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396 |
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397 origin[0] = origin[0] >= mLeft ? origin[0] : mLeft; |
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398 origin[1] = origin[1] >= mTop ? origin[1] : mTop; |
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399 |
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400 if (log.isDebugEnabled()) { |
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401 log.debug("==> centered left origin: " + origin[0]); |
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402 log.debug("==> centered top origin: " + origin[1]); |
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403 } |
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404 |
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405 return origin; |
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406 } |
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407 } |
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408 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 : |