Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/exports/ChartExportHelper.java @ 320:18302372703f

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Implemented pdf export of charts. gnv-artifacts/trunk@381 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Mon, 30 Nov 2009 09:51:59 +0000
parents 5f2820e821e0
children a4376fd23f99
rev   line source
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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 import com.lowagie.text.pdf.PdfContentByte;
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8 import com.lowagie.text.pdf.PdfTemplate;
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9 import com.lowagie.text.pdf.PdfWriter;
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10
318
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11 import java.awt.Transparency;
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12 import java.awt.Graphics2D;
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13 import java.awt.geom.Rectangle2D;
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14 import java.awt.geom.Rectangle2D.Double;
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15 import java.io.OutputStream;
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16 import java.io.IOException;
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17 import javax.imageio.ImageIO;
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18
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19 import org.apache.log4j.Logger;
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20
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21 import org.jfree.chart.JFreeChart;
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320
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23
318
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24 /**
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25 * @author Ingo Weinzierl <ingo.weinzierl@intevation.de>
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26 */
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27 public class ChartExportHelper {
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28
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29 private static final String DEFAULT_PAGE_SIZE = "A4";
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31 private static Logger log = Logger.getLogger(ChartExportHelper.class);
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32
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33 public static void exportImage(
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34 OutputStream out,
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35 JFreeChart chart,
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36 String format,
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37 int width,
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38 int height
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39 )
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40 throws IOException
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41 {
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42 log.info("export chart as png");
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43
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44 ImageIO.write(
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45 chart.createBufferedImage(
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46 width, height, Transparency.BITMASK, null
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47 ),
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48 format,
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49 out
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50 );
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51 }
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52
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53
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54 public static void exportSVG() {
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55 log.info("export chart as svg (not implemented yet)");
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56 }
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57
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58
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59 public static void exportPDF(
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60 OutputStream out,
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61 JFreeChart chart,
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62 String pageFormat,
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63 boolean landscape,
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64 float marginLeft,
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65 float marginRight,
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66 float marginTop,
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67 float marginBottom
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68 ) {
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69 log.info("export chart as pdf.");
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70
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71 if (pageFormat == null)
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72 pageFormat = DEFAULT_PAGE_SIZE;
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73
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74 Rectangle page = PageSize.getRectangle(pageFormat);
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75 int pageWidth = (int) (page.getRight(marginRight) - page.getLeft(marginLeft));
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76 int pageHeight = (int) (page.getTop(marginTop) - page.getBottom(marginBottom));
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77
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78 Document document = null;
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79 if (landscape) {
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80 document = new Document(page.rotate());
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81 log.debug("Create landscape pdf.");
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82 }
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83 else
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84 document = new Document(page);
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85
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86 try {
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87 PdfWriter writer = PdfWriter.getInstance(document, out);
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88
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89 document.addSubject(chart.getTitle().getText());
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90 document.addCreationDate();
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91 document.open();
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92
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93 PdfContentByte content = writer.getDirectContent();
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94
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95 int width = 0;
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96 int height = 0;
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97 if (landscape) {
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98 width = pageHeight;
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99 height = pageWidth;
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100 }
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101 else {
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102 width = pageWidth;
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103 height = pageHeight;
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104 }
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105
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106 PdfTemplate template = content.createTemplate(width, height);
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107 Graphics2D graphics = template.createGraphics(width, height);
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108 Rectangle2D area = new Rectangle2D.Double(0.0D, 0.0D,width,height);
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109
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110 chart.draw(graphics, area);
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111 graphics.dispose();
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112 content.addTemplate(template, marginLeft, marginBottom);
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113 }
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114 catch (DocumentException de) {
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115 log.error("Error while exporting chart to pdf.", de);
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116 }
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117 finally {
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118 document.close();
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119 }
318
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120 }
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121 }
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122 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org