Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/exports/ChartExportHelper.java @ 617:3d13fa281a7e

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Added new ouput mode: histogram. gnv-artifacts/trunk@688 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Mon, 15 Feb 2010 11:44:01 +0000
parents a88e15972c72
children 65f09139e9b3
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
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11 import java.awt.Transparency;
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12 import java.awt.Graphics;
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13 import java.awt.Graphics2D;
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14 import java.awt.geom.Point2D;
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15 import java.awt.geom.Rectangle2D;
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16 import java.awt.geom.Rectangle2D.Double;
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17 import java.awt.image.BufferedImage;
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18 import java.io.OutputStream;
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19 import java.io.OutputStreamWriter;
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20 import java.io.IOException;
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21 import java.io.UnsupportedEncodingException;
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22 import javax.imageio.ImageIO;
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24 import org.apache.batik.svggen.SVGGraphics2D;
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25 import org.apache.batik.svggen.SVGGraphics2DIOException;
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26 import org.apache.log4j.Logger;
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27
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28 import org.jfree.chart.JFreeChart;
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29
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30 import de.intevation.artifactdatabase.XMLUtils;
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31 import de.intevation.gnv.chart.Chart;
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34 /**
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35 * @author Ingo Weinzierl <ingo.weinzierl@intevation.de>
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36 */
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37 public class ChartExportHelper {
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38
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39 private static final String DEFAULT_PAGE_SIZE = "A4";
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40 private static final String DEFAULT_ENCODING = "UTF-8";
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41
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42 private static Logger log = Logger.getLogger(ChartExportHelper.class);
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43
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44 public static void exportImage(
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45 OutputStream out,
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46 JFreeChart chart,
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47 String format,
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48 int width,
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49 int height
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50 )
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51 throws IOException
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52 {
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53 log.info("export chart as png");
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54
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55 ImageIO.write(
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56 chart.createBufferedImage(
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57 width, height, Transparency.BITMASK, null
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58 ),
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59 format,
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60 out
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61 );
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62 }
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63
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64
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65 public static void exportHistograms(
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66 OutputStream out,
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67 Chart[] histograms,
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68 String format,
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69 int width,
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70 int height)
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71 throws IOException
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72 {
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73 log.info("export histograms");
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74
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75 int size = histograms.length;
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76 BufferedImage image = new BufferedImage(
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77 width, height*size, BufferedImage.TYPE_INT_RGB);
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78 Graphics2D g = image.createGraphics();
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79
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80 for (int i = 0; i < size; i++) {
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81 JFreeChart chart = histograms[i].generateChart();
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82 chart.draw(g, new Rectangle2D.Double(0.0D, i*height, width, height));
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83 }
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84 g.finalize();
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85
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86 ImageIO.write(image, format, out);
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87 }
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88
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89
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90 public static void exportSVG(
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91 OutputStream out,
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92 JFreeChart chart,
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93 String encoding,
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94 int width,
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95 int height
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96 ) {
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97 log.info("export chart as svg");
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98
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99 if (encoding == null)
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100 encoding = DEFAULT_ENCODING;
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101
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102 org.w3c.dom.Document document = XMLUtils.newDocument();
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103 SVGGraphics2D graphics = new SVGGraphics2D(document);
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104
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105 chart.draw(graphics, new Rectangle2D.Double(0.0D, 0.0D,width,height));
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106
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107 try {
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108 graphics.stream(new OutputStreamWriter(out, encoding));
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109 }
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110 catch (SVGGraphics2DIOException svge) {
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111 log.error("Error while writing svg export to output stream.", svge);
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112 }
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113 catch (UnsupportedEncodingException uee) {
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114 log.error("Unsupported encoding: " + encoding, uee);
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115 }
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116 }
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117
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118
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119 public static void exportPDF(
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120 OutputStream out,
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121 JFreeChart chart,
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122 String pageFormat,
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123 boolean landscape,
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124 float marginLeft,
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125 float marginRight,
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126 float marginTop,
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127 float marginBottom
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128 ) {
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129 log.info("export chart as pdf.");
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130
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131 if (pageFormat == null)
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132 pageFormat = DEFAULT_PAGE_SIZE;
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133
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134 Rectangle page = PageSize.getRectangle(pageFormat);
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135 int pageWidth = (int) (page.getRight(marginRight) - page.getLeft(marginLeft));
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136 int pageHeight = (int) (page.getTop(marginTop) - page.getBottom(marginBottom));
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137
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138 Document document = null;
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139 if (landscape) {
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140 document = new Document(page.rotate());
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141 log.debug("Create landscape pdf.");
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142 }
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143 else
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144 document = new Document(page);
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145
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146 try {
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147 PdfWriter writer = PdfWriter.getInstance(document, out);
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148
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149 document.addSubject(chart.getTitle().getText());
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150 document.addCreationDate();
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151 document.open();
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152
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153 PdfContentByte content = writer.getDirectContent();
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154
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155 int width = 0;
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156 int height = 0;
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157 if (landscape) {
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158 width = pageHeight;
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159 height = pageWidth;
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160 }
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161 else {
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162 width = pageWidth;
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163 height = pageHeight;
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164 }
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165
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166 PdfTemplate template = content.createTemplate(width, height);
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167 Graphics2D graphics = template.createGraphics(width, height);
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168 Rectangle2D area = new Rectangle2D.Double(0.0D, 0.0D,width,height);
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169
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170 chart.draw(graphics, area);
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171 graphics.dispose();
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172 content.addTemplate(template, marginLeft, marginBottom);
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173 }
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174 catch (DocumentException de) {
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175 log.error("Error while exporting chart to pdf.", de);
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176 }
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177 finally {
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178 document.close();
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179 }
318
5f2820e821e0 Implemented a helper class for exporting charts. Adapted code.
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180 }
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181 }
320
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182 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org