Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/exports/ChartExportHelper.java @ 2160:8428de5846e8

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Employ ChartRenderingInfo when creating svg/pdf exports. flys-artifacts/trunk@3746 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Mon, 23 Jan 2012 07:55:17 +0000
parents 5966a20fc72c
children 5648b5b34ae2
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 org.apache.batik.svggen.SVGGraphics2D;
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35 import org.apache.batik.svggen.SVGGraphics2DIOException;
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36
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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 import de.intevation.artifacts.CallContext;
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42
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43 import de.intevation.artifacts.common.utils.XMLUtils;
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44
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45
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46 /**
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47 * This class is a helper class which supports some methods to export charts
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48 * into specific formats.
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49 *
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50 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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51 */
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52 public class ChartExportHelper {
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53
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54 public static final String FORMAT_PNG = "png";
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55
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56 public static final String FORMAT_PDF = "pdf";
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57
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58 public static final String FORMAT_SVG = "svg";
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59
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60
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61 /**
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62 * Constant field to define A4 as default page size.
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63 */
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64 public static final String DEFAULT_PAGE_SIZE = "A4";
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65
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66 /**
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67 * Constant field to define UTF-8 as default encoding.
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68 */
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69 public static final String DEFAULT_ENCODING = "UTF-8";
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70
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71 /**
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72 * Logger used for logging with log4j.
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73 */
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74 private static Logger log = Logger.getLogger(ChartExportHelper.class);
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75
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76
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77 /**
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78 * A method to export a <code>JFreeChart</code> as image to an
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79 * <code>OutputStream</code> with a given format, width and height.
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80 *
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81 * @param out OutputStream
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82 * @param chart JFreeChart object to be exported.
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83 * @param format Format (e.g. png, gif, jpg)
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84 * @param width Width, the image used to be
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85 * @param height Height, the image used to be
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86 *
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87 * @throws IOException if writing image to OutputStream failed.
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88 */
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89 public static void exportImage(
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90 OutputStream out,
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91 JFreeChart chart,
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92 CallContext cc
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93 )
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94 throws IOException
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95 {
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96 log.info("export chart as png");
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97
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98 ChartRenderingInfo info = new ChartRenderingInfo();
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99
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100 String format = (String) cc.getContextValue("chart.image.format");
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101
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102 int[] size = getSize(cc);
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103
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104 ImageIO.write(
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105 chart.createBufferedImage(
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106 size[0], size[1], Transparency.BITMASK, info
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107 ),
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108 format,
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109 out
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110 );
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111 }
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112
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113
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114 /**
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115 * A method to export a <code>JFreeChart</code> as SVG to an
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116 * <code>OutputStream</code>.
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117 *
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118 * @param out OutputStream
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119 * @param chart JFreeChart to be exported
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120 * @param context The CallContext object that contains extra chart
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121 * parameters.
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122 */
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123 public static void exportSVG(
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124 OutputStream out,
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125 JFreeChart chart,
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126 CallContext context
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127 ) {
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128 String encoding = (String) context.getContextValue("chart.encoding");
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129
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130 log.info("export chart as svg");
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131
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132 if (encoding == null)
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133 encoding = DEFAULT_ENCODING;
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134
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135 org.w3c.dom.Document document = XMLUtils.newDocument();
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136 SVGGraphics2D graphics = new SVGGraphics2D(document);
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137
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138 int[] size = getSize(context);
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139
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140 ChartRenderingInfo info = new ChartRenderingInfo();
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141
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142 chart.draw(graphics, new Rectangle2D.Double(0.0D, 0.0D,size[0],size[1]), info);
152
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143
956445dd601d Added a helper class to export charts.
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144 try {
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145 graphics.stream(new OutputStreamWriter(out, encoding));
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146 }
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147 catch (SVGGraphics2DIOException svge) {
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148 log.error("Error while writing svg export to output stream.", svge);
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149 }
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150 catch (UnsupportedEncodingException uee) {
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151 log.error("Unsupported encoding: " + encoding, uee);
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152 }
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153 }
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154
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155
956445dd601d Added a helper class to export charts.
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156 /**
956445dd601d Added a helper class to export charts.
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157 * A method to export a <code>JFreeChart</code> as PDF to an
956445dd601d Added a helper class to export charts.
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158 * <code>OutputStream</code>.
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159 *
956445dd601d Added a helper class to export charts.
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160 * @param out OutputStream
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161 * @param chart JFreeChart
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162 * @param pageFormat String to specify a page format, {@link
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163 * #DEFAULT_PAGE_SIZE} is used if no pageFormat is given
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164 * @param landscape If this is true, the pdf is delivered in landscape
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165 * format
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166 * @param marginLeft Space to left border
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167 * @param marginRight Space to right border
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168 * @param marginTop Space to upper border
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169 * @param marginBottom Space to lower border
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170 */
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171 public static void exportPDF(
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172 OutputStream out,
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173 JFreeChart chart,
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174 CallContext cc
152
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175 ) {
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176 log.info("export chart as pdf.");
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177
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178 String pageFormat = (String) cc.getContextValue("chart.page.format");
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179
152
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180 if (pageFormat == null)
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181 pageFormat = DEFAULT_PAGE_SIZE;
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182
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183 // max size of the chart
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184 Rectangle page = PageSize.getRectangle(pageFormat);
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185 float pageWidth = page.getWidth();
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186 float pageHeight = page.getHeight();
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187
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188 // the chart width
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189 int[] size = getSize(cc);
152
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190
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191 boolean landscape = size[0] > size[1];
152
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192
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193 float width = 0;
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194 float height = 0;
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195 if (landscape) {
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196 width = pageHeight;
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197 height = pageWidth;
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198 }
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199 else {
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200 width = pageWidth;
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201 height = pageHeight;
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202 }
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203
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204 float marginLeft = (Float) cc.getContextValue(
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205 "chart.marginLeft");
5966a20fc72c Enabled support for PDF and SVG chart exports.
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206
5966a20fc72c Enabled support for PDF and SVG chart exports.
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207 float marginRight = (Float) cc.getContextValue(
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208 "chart.marginRight");
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209
5966a20fc72c Enabled support for PDF and SVG chart exports.
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210 float marginTop = (Float) cc.getContextValue(
5966a20fc72c Enabled support for PDF and SVG chart exports.
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211 "chart.marginTop");
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212
5966a20fc72c Enabled support for PDF and SVG chart exports.
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213 float marginBottom = (Float) cc.getContextValue(
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214 "chart.marginBottom");
5966a20fc72c Enabled support for PDF and SVG chart exports.
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215
152
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216 float spaceX = width - marginLeft - marginRight;
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5966a20fc72c Enabled support for PDF and SVG chart exports.
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217 if (size[0] > spaceX) {
152
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218 log.warn("Width of the chart is too big for pdf -> resize it now.");
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219 double ratio = ((double)spaceX) / size[0];
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220 size[0] *= ratio;
5966a20fc72c Enabled support for PDF and SVG chart exports.
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diff changeset
221 size[1] *= ratio;
5966a20fc72c Enabled support for PDF and SVG chart exports.
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222 log.debug("Resized chart to " + size[0] + "x" + size[1]);
152
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223 }
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diff changeset
224
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diff changeset
225 float spaceY = height - marginTop - marginBottom;
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226 if (size[1] > spaceY) {
152
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227 log.warn("Height of the chart is too big for pdf -> resize it now.");
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5966a20fc72c Enabled support for PDF and SVG chart exports.
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228 double ratio = ((double)spaceY) / size[1];
5966a20fc72c Enabled support for PDF and SVG chart exports.
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diff changeset
229 size[0] *= ratio;
5966a20fc72c Enabled support for PDF and SVG chart exports.
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diff changeset
230 size[1] *= ratio;
5966a20fc72c Enabled support for PDF and SVG chart exports.
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diff changeset
231 log.debug("Resized chart to " + size[0] + "x" + size[1]);
152
956445dd601d Added a helper class to export charts.
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diff changeset
232 }
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233
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diff changeset
234 Document document = null;
956445dd601d Added a helper class to export charts.
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diff changeset
235 if (landscape) {
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diff changeset
236 document = new Document(page.rotate());
956445dd601d Added a helper class to export charts.
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diff changeset
237 log.debug("Create landscape pdf.");
956445dd601d Added a helper class to export charts.
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diff changeset
238 }
956445dd601d Added a helper class to export charts.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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diff changeset
239 else
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diff changeset
240 document = new Document(page);
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diff changeset
241
956445dd601d Added a helper class to export charts.
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diff changeset
242 try {
956445dd601d Added a helper class to export charts.
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diff changeset
243 PdfWriter writer = PdfWriter.getInstance(document, out);
956445dd601d Added a helper class to export charts.
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244
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245 document.addSubject(chart.getTitle().getText());
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diff changeset
246 document.addCreationDate();
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247 document.open();
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248
956445dd601d Added a helper class to export charts.
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diff changeset
249 PdfContentByte content = writer.getDirectContent();
956445dd601d Added a helper class to export charts.
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diff changeset
250
956445dd601d Added a helper class to export charts.
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diff changeset
251 PdfTemplate template = content.createTemplate(width, height);
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diff changeset
252 Graphics2D graphics = template.createGraphics(width, height);
956445dd601d Added a helper class to export charts.
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diff changeset
253
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diff changeset
254 double[] origin = getCenteredAnchor(
956445dd601d Added a helper class to export charts.
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diff changeset
255 marginLeft, marginRight, marginBottom, marginTop,
956445dd601d Added a helper class to export charts.
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diff changeset
256 width, height,
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diff changeset
257 size[0], size[1]);
152
956445dd601d Added a helper class to export charts.
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diff changeset
258
956445dd601d Added a helper class to export charts.
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diff changeset
259 Rectangle2D area = new Rectangle2D.Double(
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260 origin[0], origin[1], size[0], size[1]);
152
956445dd601d Added a helper class to export charts.
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diff changeset
261
2160
8428de5846e8 Employ ChartRenderingInfo when creating svg/pdf exports.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
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diff changeset
262 ChartRenderingInfo info = new ChartRenderingInfo();
8428de5846e8 Employ ChartRenderingInfo when creating svg/pdf exports.
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diff changeset
263
8428de5846e8 Employ ChartRenderingInfo when creating svg/pdf exports.
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diff changeset
264 chart.draw(graphics, area, info);
152
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diff changeset
265 graphics.dispose();
956445dd601d Added a helper class to export charts.
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266 content.addTemplate(template, 0f, 0f);
956445dd601d Added a helper class to export charts.
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diff changeset
267 }
956445dd601d Added a helper class to export charts.
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diff changeset
268 catch (DocumentException de) {
956445dd601d Added a helper class to export charts.
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diff changeset
269 log.error("Error while exporting chart to pdf.", de);
956445dd601d Added a helper class to export charts.
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diff changeset
270 }
956445dd601d Added a helper class to export charts.
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diff changeset
271 finally {
956445dd601d Added a helper class to export charts.
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272 document.close();
956445dd601d Added a helper class to export charts.
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diff changeset
273 }
956445dd601d Added a helper class to export charts.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
274 }
956445dd601d Added a helper class to export charts.
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275
956445dd601d Added a helper class to export charts.
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276
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277 public static int[] getSize(CallContext cc) {
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278 int[] size = new int[2];
5966a20fc72c Enabled support for PDF and SVG chart exports.
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279
5966a20fc72c Enabled support for PDF and SVG chart exports.
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280 size[0] = (Integer) cc.getContextValue("chart.width");
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281 size[1] = (Integer) cc.getContextValue("chart.height");
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282
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283 return size;
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284 }
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285
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286
152
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287 /**
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288 * This method returns the anchor of the chart so that the chart is centered
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289 * according to the given parameters.
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290 *
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291 * @param mLeft Left margin
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292 * @param mRight Right margin
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293 * @param mBottom Bottom margin
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294 * @param mTop Top margin
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295 * @param width The complete width of the drawing area.
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296 * @param height The complete height of the drawing area.
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297 * @param chartWidth The width of the chart.
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298 * @param chartHeight The height of the chart.
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299 *
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300 * @return an array that contains the anchor for a chart with the given
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301 * parameters. The first value is the x point, the second value is the y
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302 * point.
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303 */
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304 public static double[] getCenteredAnchor(
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305 double mLeft, double mRight, double mBottom, double mTop,
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306 double width, double height,
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307 double chartWidth, double chartHeight
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308 ) {
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309 if (log.isDebugEnabled()) {
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310 log.debug("Calculate centered origin...");
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311 log.debug("-> PDF width : " + width);
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312 log.debug("-> PDF height : " + height);
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313 log.debug("-> Chart width : " + chartWidth);
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314 log.debug("-> Chart height : " + chartHeight);
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315 log.debug("-> margin left : " + mLeft);
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316 log.debug("-> margin right : " + mRight);
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317 log.debug("-> margin bottom: " + mBottom);
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318 log.debug("-> margin top : " + mTop);
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319 }
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320
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321 double[] origin = new double[2];
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322
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323 double centerX = width / 2;
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324 double centerY = height / 2;
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325
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326 origin[0] = centerX - chartWidth / 2;
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327 origin[1] = centerY - chartHeight / 2;
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328
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329 origin[0] = origin[0] >= mLeft ? origin[0] : mLeft;
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330 origin[1] = origin[1] >= mTop ? origin[1] : mTop;
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331
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332 if (log.isDebugEnabled()) {
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333 log.debug("==> centered left origin: " + origin[0]);
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334 log.debug("==> centered top origin: " + origin[1]);
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335 }
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336
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337 return origin;
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338 }
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339 }
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340 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org