Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/exports/ChartExportHelper.java @ 714:2f25ca828efd

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Only generate 'outs' if they have facets. flys-artifacts/trunk@2180 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 21 Jun 2011 16:22:28 +0000
parents 084995dd1c9c
children e6aff80b59ff
rev   line source
152
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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
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31 import javax.imageio.ImageIO;
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32
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33 import org.apache.batik.svggen.SVGGraphics2D;
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34 import org.apache.batik.svggen.SVGGraphics2DIOException;
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35
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36 import org.apache.log4j.Logger;
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37
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38 import org.jfree.chart.JFreeChart;
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39
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40 import de.intevation.artifacts.CallContext;
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41
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42 import de.intevation.artifacts.common.utils.XMLUtils;
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43
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44
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45 /**
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46 * This class is a helper class which supports some methods to export charts
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47 * into specific formats.
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48 *
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49 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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50 */
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51 public class ChartExportHelper {
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52
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53 /**
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54 * Constant field to define A4 as default page size.
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55 */
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56 private static final String DEFAULT_PAGE_SIZE = "A4";
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57
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58 /**
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59 * Constant field to define UTF-8 as default encoding.
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60 */
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61 private static final String DEFAULT_ENCODING = "UTF-8";
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62
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63 /**
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64 * Logger used for logging with log4j.
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65 */
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66 private static Logger log = Logger.getLogger(ChartExportHelper.class);
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67
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68
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69 /**
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70 * A method to export a <code>JFreeChart</code> as image to an
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71 * <code>OutputStream</code> with a given format, width and height.
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72 *
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73 * @param out OutputStream
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74 * @param chart JFreeChart object to be exported.
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75 * @param format Format (e.g. png, gif, jpg)
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76 * @param width Width, the image used to be
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77 * @param height Height, the image used to be
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78 *
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79 * @throws IOException if writing image to OutputStream failed.
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80 */
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81 public static void exportImage(
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82 OutputStream out,
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83 JFreeChart chart,
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84 String format,
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85 int width,
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86 int height
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87 )
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88 throws IOException
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89 {
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90 log.info("export chart as png");
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91
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92 ImageIO.write(
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93 chart.createBufferedImage(
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94 width, height, Transparency.BITMASK, null
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95 ),
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96 format,
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97 out
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98 );
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99 }
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100
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101
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102 /**
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103 * A method to export a <code>JFreeChart</code> as SVG to an
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104 * <code>OutputStream</code>.
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105 *
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106 * @param out OutputStream
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107 * @param chart JFreeChart to be exported
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108 * @param encoding Encoding, defaults to {@link #DEFAULT_ENCODING} if null
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109 * @param width Width the svg used to be
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110 * @param height Height the svg used to be
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111 */
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112 public static void exportSVG(
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113 OutputStream out,
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114 JFreeChart chart,
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115 String encoding,
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116 int width,
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117 int height
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118 ) {
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119 log.info("export chart as svg");
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120
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121 if (encoding == null)
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122 encoding = DEFAULT_ENCODING;
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123
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124 org.w3c.dom.Document document = XMLUtils.newDocument();
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125 SVGGraphics2D graphics = new SVGGraphics2D(document);
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126
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127 chart.draw(graphics, new Rectangle2D.Double(0.0D, 0.0D,width,height));
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128
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129 try {
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130 graphics.stream(new OutputStreamWriter(out, encoding));
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131 }
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132 catch (SVGGraphics2DIOException svge) {
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133 log.error("Error while writing svg export to output stream.", svge);
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134 }
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135 catch (UnsupportedEncodingException uee) {
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136 log.error("Unsupported encoding: " + encoding, uee);
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137 }
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138 }
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139
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140
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141 /**
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142 * A method to export a <code>JFreeChart</code> as PDF to an
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143 * <code>OutputStream</code>.
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144 *
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145 * @param out OutputStream
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146 * @param chart JFreeChart
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147 * @param pageFormat String to specify a page format, {@link
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148 * #DEFAULT_PAGE_SIZE} is used if no pageFormat is given
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149 * @param landscape If this is true, the pdf is delivered in landscape
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150 * format
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151 * @param marginLeft Space to left border
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152 * @param marginRight Space to right border
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153 * @param marginTop Space to upper border
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154 * @param marginBottom Space to lower border
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155 */
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156 public static void exportPDF(
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157 OutputStream out,
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158 JFreeChart chart,
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159 String pageFormat,
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160 float marginLeft,
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161 float marginRight,
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162 float marginTop,
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163 float marginBottom,
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164 CallContext context
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165 ) {
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166 log.info("export chart as pdf.");
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167
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168 if (pageFormat == null)
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169 pageFormat = DEFAULT_PAGE_SIZE;
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170
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171 // max size of the chart
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172 Rectangle page = PageSize.getRectangle(pageFormat);
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173 float pageWidth = page.getWidth();
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174 float pageHeight = page.getHeight();
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175
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176 // the chart width
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177 int chartWidth = (Integer) context.getContextValue("chart.width");
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178 int chartHeight = (Integer) context.getContextValue("chart.height");
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179
714
2f25ca828efd Only generate 'outs' if they have facets.
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180 boolean landscape = chartWidth > chartHeight;
152
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181
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182 float width = 0;
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183 float height = 0;
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184 if (landscape) {
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185 width = pageHeight;
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186 height = pageWidth;
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187 }
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188 else {
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189 width = pageWidth;
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190 height = pageHeight;
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191 }
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192
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193 float spaceX = width - marginLeft - marginRight;
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194 if (chartWidth > spaceX) {
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195 log.warn("Width of the chart is too big for pdf -> resize it now.");
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196 double ratio = ((double)spaceX) / chartWidth;
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197 chartWidth *= ratio;
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198 chartHeight *= ratio;
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199 log.debug("Resized chart to " + chartWidth + "x" + chartHeight);
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200 }
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201
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202 float spaceY = height - marginTop - marginBottom;
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203 if (chartHeight > spaceY) {
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204 log.warn("Height of the chart is too big for pdf -> resize it now.");
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205 double ratio = ((double)spaceY) / chartHeight;
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206 chartWidth *= ratio;
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207 chartHeight *= ratio;
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208 log.debug("Resized chart to " + chartWidth + "x" + chartHeight);
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209 }
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210
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211 Document document = null;
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212 if (landscape) {
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213 document = new Document(page.rotate());
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214 log.debug("Create landscape pdf.");
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215 }
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216 else
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217 document = new Document(page);
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218
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219 try {
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220 PdfWriter writer = PdfWriter.getInstance(document, out);
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221
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222 document.addSubject(chart.getTitle().getText());
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223 document.addCreationDate();
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224 document.open();
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225
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226 PdfContentByte content = writer.getDirectContent();
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227
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228 PdfTemplate template = content.createTemplate(width, height);
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229 Graphics2D graphics = template.createGraphics(width, height);
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230
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231 double[] origin = getCenteredAnchor(
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232 marginLeft, marginRight, marginBottom, marginTop,
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233 width, height,
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234 chartWidth, chartHeight);
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235
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236 Rectangle2D area = new Rectangle2D.Double(
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237 origin[0], origin[1], chartWidth, chartHeight);
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238
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239 chart.draw(graphics, area);
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240 graphics.dispose();
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241 content.addTemplate(template, 0f, 0f);
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242 }
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243 catch (DocumentException de) {
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244 log.error("Error while exporting chart to pdf.", de);
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245 }
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246 finally {
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247 document.close();
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248 }
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249 }
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250
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251
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252 /**
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253 * This method returns the anchor of the chart so that the chart is centered
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254 * according to the given parameters.
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255 *
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256 * @param mLeft Left margin
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257 * @param mRight Right margin
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258 * @param mBottom Bottom margin
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259 * @param mTop Top margin
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260 * @param width The complete width of the drawing area.
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261 * @param height The complete height of the drawing area.
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262 * @param chartWidth The width of the chart.
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263 * @param chartHeight The height of the chart.
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264 *
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265 * @return an array that contains the anchor for a chart with the given
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266 * parameters. The first value is the x point, the second value is the y
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267 * point.
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268 */
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269 public static double[] getCenteredAnchor(
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270 double mLeft, double mRight, double mBottom, double mTop,
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271 double width, double height,
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272 double chartWidth, double chartHeight
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273 ) {
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274 if (log.isDebugEnabled()) {
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275 log.debug("Calculate centered origin...");
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276 log.debug("-> PDF width : " + width);
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277 log.debug("-> PDF height : " + height);
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278 log.debug("-> Chart width : " + chartWidth);
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279 log.debug("-> Chart height : " + chartHeight);
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280 log.debug("-> margin left : " + mLeft);
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281 log.debug("-> margin right : " + mRight);
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282 log.debug("-> margin bottom: " + mBottom);
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283 log.debug("-> margin top : " + mTop);
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284 }
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285
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286 double[] origin = new double[2];
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287
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288 double centerX = width / 2;
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289 double centerY = height / 2;
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290
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291 origin[0] = centerX - chartWidth / 2;
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292 origin[1] = centerY - chartHeight / 2;
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293
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294 origin[0] = origin[0] >= mLeft ? origin[0] : mLeft;
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295 origin[1] = origin[1] >= mTop ? origin[1] : mTop;
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296
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297 if (log.isDebugEnabled()) {
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298 log.debug("==> centered left origin: " + origin[0]);
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299 log.debug("==> centered top origin: " + origin[1]);
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300 }
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301
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302 return origin;
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303 }
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304 }
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305 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org