Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/exports/ChartExportHelper.java @ 1056:0318fda0001e

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Fixed a bug in the pdf export. gnv-artifacts/trunk@1131 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 27 May 2010 08:48:16 +0000
parents 6169ddc827ac
children f2127cd0fe31
rev   line source
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1 package de.intevation.gnv.exports;
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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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8 import com.lowagie.text.pdf.PdfContentByte;
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9 import com.lowagie.text.pdf.PdfTemplate;
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10 import com.lowagie.text.pdf.PdfWriter;
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11
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7f3154331bc1 Use the chart size/height to export it to pdf. The chart's aspect ratio keeps alive if the size exceeds the maximum page size (issue290).
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12 import de.intevation.artifacts.CallContext;
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14 import de.intevation.artifactdatabase.XMLUtils;
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15
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16 import de.intevation.gnv.chart.Chart;
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18 import java.awt.Graphics2D;
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19 import java.awt.Transparency;
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20
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21 import java.awt.geom.Rectangle2D.Double;
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23 import java.awt.geom.Rectangle2D;
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25 import java.awt.image.BufferedImage;
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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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32 import javax.imageio.ImageIO;
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34 import org.apache.batik.svggen.SVGGraphics2D;
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35 import org.apache.batik.svggen.SVGGraphics2DIOException;
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37 import org.apache.log4j.Logger;
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38
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39 import org.jfree.chart.JFreeChart;
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40
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41 /**
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42 * This class is a helper class which supports some methods to export charts
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43 * into specific formats.
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44 *
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45 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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46 */
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47 public class ChartExportHelper {
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48
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49 /**
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50 * Constant field to define A4 as default page size.
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51 */
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52 private static final String DEFAULT_PAGE_SIZE = "A4";
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53
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54 /**
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55 * Constant field to define UTF-8 as default encoding.
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56 */
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57 private static final String DEFAULT_ENCODING = "UTF-8";
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59 /**
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60 * Logger used for logging with log4j.
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61 */
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62 private static Logger log = Logger.getLogger(ChartExportHelper.class);
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64
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65 /**
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66 * A method to export a <code>JFreeChart</code> as image to an
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67 * <code>OutputStream</code> with a given format, width and height.
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68 *
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69 * @param out OutputStream
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70 * @param chart JFreeChart object to be exported.
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71 * @param format Format (e.g. png, gif, jpg)
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72 * @param width Width, the image used to be
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73 * @param height Height, the image used to be
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74 *
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75 * @throws IOException if writing image to OutputStream failed.
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76 */
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77 public static void exportImage(
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78 OutputStream out,
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79 JFreeChart chart,
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80 String format,
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81 int width,
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82 int height
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83 )
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84 throws IOException
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85 {
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86 log.info("export chart as png");
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87
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88 ImageIO.write(
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89 chart.createBufferedImage(
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90 width, height, Transparency.BITMASK, null
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91 ),
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92 format,
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93 out
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94 );
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95 }
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98 /**
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99 * A method to export a <code>JFreeChart</code> histogram as image to an
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100 * <code>OutputStream</code> with a given format, width and height.
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101 *
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102 * @param out OutputStream
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103 * @param histograms Array of {@link de.intevation.gnv.chart.Chart} objects
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104 * @param format A format (e.g. png, gif, jpg)
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105 * @param width Width the image used to be
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106 * @param height Height the image used to be
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107 *
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108 * @throws IOException if writing image to OutputStream failed.
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109 */
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110 public static void exportHistograms(
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111 OutputStream out,
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112 Chart[] histograms,
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113 String format,
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114 int width,
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115 int height)
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116 throws IOException
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117 {
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118 log.info("export histograms");
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119
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120 int size = histograms.length;
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121 BufferedImage image = new BufferedImage(
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122 width, height*size, BufferedImage.TYPE_INT_RGB);
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123 Graphics2D g = image.createGraphics();
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124
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125 for (int i = 0; i < size; i++) {
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126 JFreeChart chart = histograms[i].generateChart();
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127 chart.draw(g, new Rectangle2D.Double(0.0D, i*height, width, height));
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128 }
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129 g.finalize();
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130
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131 ImageIO.write(image, format, out);
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132 }
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133
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134
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135 /**
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136 * A method to export a <code>JFreeChart</code> histogram as SVG to an
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137 * <code>OutputStream</code>.
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138 *
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139 * @param out OutputStream
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140 * @param histograms Array of {@link de.intevation.gnv.chart.Chart}
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141 * @param encoding Encoding, defaults to {@link #DEFAULT_ENCODING} if null
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142 * @param width Width the svg used to be
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143 * @param height Height the svg used to be
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144 */
639
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145 public static void exportHistogramsAsSVG(
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146 OutputStream out,
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147 Chart[] histograms,
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148 String encoding,
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149 int width,
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150 int height
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151 ) {
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152 log.info("export histograms as svg");
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153
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154 if (encoding == null)
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155 encoding = DEFAULT_ENCODING;
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156
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157 org.w3c.dom.Document document = XMLUtils.newDocument();
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158 SVGGraphics2D graphics = new SVGGraphics2D(document);
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159
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160 int size = histograms.length;
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161 for (int i = 0; i < size; i++) {
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162 JFreeChart chart = histograms[i].generateChart();
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163 chart.draw(graphics, new Rectangle2D.Double(
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164 0.0D, i*height,width,height));
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165 }
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166 graphics.finalize();
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167
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168 try {
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169 graphics.stream(new OutputStreamWriter(out, encoding));
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170 }
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171 catch (SVGGraphics2DIOException svge) {
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172 log.error("Error while writing svg export to output stream.", svge);
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173 }
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174 catch (UnsupportedEncodingException uee) {
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175 log.error("Unsupported encoding: " + encoding, uee);
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176 }
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177 }
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178
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179
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180 /**
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181 * A method to export a <code>JFreeChart</code> as SVG to an
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182 * <code>OutputStream</code>.
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183 *
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184 * @param out OutputStream
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185 * @param chart JFreeChart to be exported
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186 * @param encoding Encoding, defaults to {@link #DEFAULT_ENCODING} if null
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187 * @param width Width the svg used to be
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188 * @param height Height the svg used to be
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189 */
321
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190 public static void exportSVG(
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191 OutputStream out,
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192 JFreeChart chart,
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193 String encoding,
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194 int width,
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195 int height
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196 ) {
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197 log.info("export chart as svg");
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198
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199 if (encoding == null)
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200 encoding = DEFAULT_ENCODING;
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201
323
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202 org.w3c.dom.Document document = XMLUtils.newDocument();
321
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203 SVGGraphics2D graphics = new SVGGraphics2D(document);
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204
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205 chart.draw(graphics, new Rectangle2D.Double(0.0D, 0.0D,width,height));
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206
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207 try {
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208 graphics.stream(new OutputStreamWriter(out, encoding));
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209 }
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210 catch (SVGGraphics2DIOException svge) {
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211 log.error("Error while writing svg export to output stream.", svge);
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212 }
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213 catch (UnsupportedEncodingException uee) {
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214 log.error("Unsupported encoding: " + encoding, uee);
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215 }
318
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216 }
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217
320
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218
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219 /**
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220 * A method to export a <code>JFreeChart</code> as PDF to an
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221 * <code>OutputStream</code>.
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222 *
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223 * @param out OutputStream
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224 * @param chart JFreeChart
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225 * @param pageFormat String to specify a page format, {@link
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226 * #DEFAULT_PAGE_SIZE} is used if no pageFormat is given
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227 * @param landscape If this is true, the pdf is delivered in landscape
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228 * format
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229 * @param marginLeft Space to left border
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230 * @param marginRight Space to right border
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231 * @param marginTop Space to upper border
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232 * @param marginBottom Space to lower border
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233 */
320
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234 public static void exportPDF(
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235 OutputStream out,
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236 JFreeChart chart,
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237 String pageFormat,
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238 float marginLeft,
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239 float marginRight,
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240 float marginTop,
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241 float marginBottom,
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242 CallContext context
320
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243 ) {
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244 log.info("export chart as pdf.");
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245
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246 if (pageFormat == null)
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247 pageFormat = DEFAULT_PAGE_SIZE;
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248
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249 // max size of the chart
320
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250 Rectangle page = PageSize.getRectangle(pageFormat);
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251 int pageWidth = (int) (page.getRight(marginRight) - page.getLeft(marginLeft));
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252 int pageHeight = (int) (page.getTop(marginTop) - page.getBottom(marginBottom));
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253
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254 // the chart width
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255 int chartWidth = (Integer) context.getContextValue("chart.width");
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256 int chartHeight = (Integer) context.getContextValue("chart.height");
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257
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258 boolean landscape = chartWidth > chartHeight ? true : false;
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259
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260 int width = 0;
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261 int height = 0;
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262 if (landscape) {
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263 width = pageHeight;
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264 height = pageWidth;
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265 }
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266 else {
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267 width = pageWidth;
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268 height = pageHeight;
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269 }
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270
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271 if (chartWidth > width) {
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272 log.warn("Width of the chart is too big for pdf -> resize it now.");
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273 double ratio = ((double)width) / chartWidth;
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274 chartWidth *= ratio;
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275 chartHeight *= ratio;
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276 log.debug("Resized chart to " + chartWidth + "x" + chartHeight);
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277 }
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278
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279 if (chartHeight > height) {
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280 log.warn("Height of the chart is too big for pdf -> resize it now.");
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281 double ratio = ((double)height) / chartHeight;
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282 chartWidth *= ratio;
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283 chartHeight *= ratio;
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284 log.debug("Resized chart to " + chartWidth + "x" + chartHeight);
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285 }
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286
320
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287 Document document = null;
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288 if (landscape) {
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289 document = new Document(page.rotate());
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290 log.debug("Create landscape pdf.");
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291 }
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292 else
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293 document = new Document(page);
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294
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295 try {
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296 PdfWriter writer = PdfWriter.getInstance(document, out);
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297
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298 document.addSubject(chart.getTitle().getText());
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299 document.addCreationDate();
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300 document.open();
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301
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302 PdfContentByte content = writer.getDirectContent();
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303
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304 PdfTemplate template = content.createTemplate(width, height);
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305 Graphics2D graphics = template.createGraphics(
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306 chartWidth, chartHeight);
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307 Rectangle2D area = new Rectangle2D.Double(
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308 0.0D, 0.0D, chartWidth, chartHeight);
320
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309
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diff changeset
310 chart.draw(graphics, area);
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311 graphics.dispose();
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312 content.addTemplate(template, marginLeft, marginBottom);
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diff changeset
313 }
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diff changeset
314 catch (DocumentException de) {
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315 log.error("Error while exporting chart to pdf.", de);
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316 }
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diff changeset
317 finally {
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318 document.close();
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diff changeset
319 }
318
5f2820e821e0 Implemented a helper class for exporting charts. Adapted code.
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diff changeset
320 }
640
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321
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322
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323 /**
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324 * A method to export <code>JFreeChart</code> histograms as PDF to an
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diff changeset
325 * <code>OutputStream</code>. Each histogram contained in histograms is
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326 * drawn to an own page in the resulting pdf.
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diff changeset
327 *
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328 * @param out OutputStream
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329 * @param histograms JFreeChart histograms
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diff changeset
330 * @param pageFormat String to specify a page format, {@link
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22c18083225e Removed compiler warnings while JavaDoc generation.
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diff changeset
331 * #DEFAULT_PAGE_SIZE} is used if no pageFormat is given
771
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332 * @param landscape If this is true, the pdf is delivered in landscape
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diff changeset
333 * format
a0e63136954e Added and repaired javadoc in de.intevation.gnv.exports package.
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diff changeset
334 * @param marginLeft Space to left border
a0e63136954e Added and repaired javadoc in de.intevation.gnv.exports package.
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diff changeset
335 * @param marginRight Space to right border
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diff changeset
336 * @param marginTop Space to upper border
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337 * @param marginBottom Space to lower border
a0e63136954e Added and repaired javadoc in de.intevation.gnv.exports package.
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diff changeset
338 */
640
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diff changeset
339 public static void exportHistogramsAsPDF(
e5f1e868ee3e Implementedr histogram pdf export.
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diff changeset
340 OutputStream out,
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diff changeset
341 Chart[] histograms,
e5f1e868ee3e Implementedr histogram pdf export.
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diff changeset
342 String pageFormat,
e5f1e868ee3e Implementedr histogram pdf export.
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diff changeset
343 float marginLeft,
e5f1e868ee3e Implementedr histogram pdf export.
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diff changeset
344 float marginRight,
e5f1e868ee3e Implementedr histogram pdf export.
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diff changeset
345 float marginTop,
1053
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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diff changeset
346 float marginBottom,
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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diff changeset
347 CallContext context
640
e5f1e868ee3e Implementedr histogram pdf export.
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diff changeset
348 ) {
e5f1e868ee3e Implementedr histogram pdf export.
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diff changeset
349 log.info("export histogram as pdf.");
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diff changeset
350
e5f1e868ee3e Implementedr histogram pdf export.
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diff changeset
351 if (pageFormat == null)
e5f1e868ee3e Implementedr histogram pdf export.
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diff changeset
352 pageFormat = DEFAULT_PAGE_SIZE;
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353
e5f1e868ee3e Implementedr histogram pdf export.
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diff changeset
354 Rectangle page = PageSize.getRectangle(pageFormat);
e5f1e868ee3e Implementedr histogram pdf export.
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diff changeset
355 int pageWidth =
e5f1e868ee3e Implementedr histogram pdf export.
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diff changeset
356 (int) (page.getRight(marginRight) - page.getLeft(marginLeft));
e5f1e868ee3e Implementedr histogram pdf export.
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diff changeset
357 int pageHeight =
e5f1e868ee3e Implementedr histogram pdf export.
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diff changeset
358 (int) (page.getTop(marginTop) - page.getBottom(marginBottom));
e5f1e868ee3e Implementedr histogram pdf export.
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diff changeset
359
1053
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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diff changeset
360 // the chart width
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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parents: 1052
diff changeset
361 int chartWidth = (Integer) context.getContextValue("chart.width");
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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diff changeset
362 int chartHeight = (Integer) context.getContextValue("chart.height");
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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diff changeset
363
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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diff changeset
364 boolean landscape = chartWidth > chartHeight ? true : false;
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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diff changeset
365
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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diff changeset
366 int width = 0;
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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diff changeset
367 int height = 0;
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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diff changeset
368 if (landscape) {
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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diff changeset
369 width = pageHeight;
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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diff changeset
370 height = pageWidth;
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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diff changeset
371 }
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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diff changeset
372 else {
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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diff changeset
373 width = pageWidth;
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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diff changeset
374 height = pageHeight;
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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375 }
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376
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377 if (chartWidth > width) {
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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378 log.warn("Histogram width is too big for pdf -> resize it now.");
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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379 double ratio = ((double)width) / chartWidth;
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380 chartWidth *= ratio;
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381 chartHeight *= ratio;
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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382 log.debug("Resized histogram to " + chartWidth + "x" + chartHeight);
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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383 }
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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384
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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385 if (chartHeight > height) {
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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386 log.warn("Histogram height is too big for pdf -> resize it now.");
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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387 double ratio = ((double)height) / chartHeight;
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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388 chartWidth *= ratio;
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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389 chartHeight *= ratio;
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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diff changeset
390 log.debug("Resized histogram to " + chartWidth + "x" + chartHeight);
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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391 }
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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392
640
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393 Document document = null;
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394 if (landscape) {
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395 document = new Document(page.rotate());
e5f1e868ee3e Implementedr histogram pdf export.
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396 log.debug("Create landscape pdf.");
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397 }
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398 else
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399 document = new Document(page);
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400
e5f1e868ee3e Implementedr histogram pdf export.
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401 try {
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402 PdfWriter writer = PdfWriter.getInstance(document, out);
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403
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
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diff changeset
404 document.addCreationDate();
e5f1e868ee3e Implementedr histogram pdf export.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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diff changeset
405 document.open();
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406
e5f1e868ee3e Implementedr histogram pdf export.
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407 PdfContentByte content = writer.getDirectContent();
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diff changeset
408
e5f1e868ee3e Implementedr histogram pdf export.
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409 int size = histograms.length;
e5f1e868ee3e Implementedr histogram pdf export.
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410 for (int i = 0; i < size; i++) {
e5f1e868ee3e Implementedr histogram pdf export.
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411 if (i > 0) {
e5f1e868ee3e Implementedr histogram pdf export.
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diff changeset
412 document.newPage();
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diff changeset
413 }
e5f1e868ee3e Implementedr histogram pdf export.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 639
diff changeset
414
e5f1e868ee3e Implementedr histogram pdf export.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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diff changeset
415 JFreeChart chart = histograms[i].generateChart();
e5f1e868ee3e Implementedr histogram pdf export.
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416 PdfTemplate template = content.createTemplate(width, height);
1053
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
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diff changeset
417 Graphics2D graphics = template.createGraphics(
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1052
diff changeset
418 chartWidth, chartHeight);
640
e5f1e868ee3e Implementedr histogram pdf export.
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diff changeset
419 Rectangle2D area = new Rectangle2D.Double(
1056
0318fda0001e Fixed a bug in the pdf export.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1053
diff changeset
420 0.0D, 0.0D, chartWidth, chartHeight);
640
e5f1e868ee3e Implementedr histogram pdf export.
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421
e5f1e868ee3e Implementedr histogram pdf export.
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422 chart.draw(graphics, area);
e5f1e868ee3e Implementedr histogram pdf export.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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423 graphics.dispose();
e5f1e868ee3e Implementedr histogram pdf export.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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diff changeset
424 content.addTemplate(template, marginLeft, marginBottom);
e5f1e868ee3e Implementedr histogram pdf export.
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diff changeset
425 }
e5f1e868ee3e Implementedr histogram pdf export.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 639
diff changeset
426 }
e5f1e868ee3e Implementedr histogram pdf export.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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diff changeset
427 catch (DocumentException de) {
1053
6169ddc827ac The format of a histogram pdf depends on the width and height specified by the user - or the default size (issue290).
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1052
diff changeset
428 log.error("Error while exporting histogram to pdf.", de);
640
e5f1e868ee3e Implementedr histogram pdf export.
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diff changeset
429 }
e5f1e868ee3e Implementedr histogram pdf export.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 639
diff changeset
430 finally {
e5f1e868ee3e Implementedr histogram pdf export.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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diff changeset
431 document.close();
e5f1e868ee3e Implementedr histogram pdf export.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 639
diff changeset
432 }
e5f1e868ee3e Implementedr histogram pdf export.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 639
diff changeset
433 }
318
5f2820e821e0 Implemented a helper class for exporting charts. Adapted code.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
434 }
320
18302372703f Implemented pdf export of charts.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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diff changeset
435 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org