Source Code Cross Referenced for Renderer.java in  » Chart » cewolf-1.0 » de » laures » cewolf » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Chart » cewolf 1.0 » de.laures.cewolf.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* ================================================================
002:         * Cewolf : Chart enabling Web Objects Framework
003:         * ================================================================
004:         *
005:         * Project Info:  http://cewolf.sourceforge.net
006:         * Project Lead:  Guido Laures (guido@laures.de);
007:         *
008:         * (C) Copyright 2002, by Guido Laures
009:         *
010:         * This library is free software; you can redistribute it and/or modify it under the terms
011:         * of the GNU Lesser General Public License as published by the Free Software Foundation;
012:         * either version 2.1 of the License, or (at your option) any later version.
013:         *
014:         * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
015:         * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
016:         * See the GNU Lesser General Public License for more details.
017:         *
018:         * You should have received a copy of the GNU Lesser General Public License along with this
019:         * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
020:         * Boston, MA 02111-1307, USA.
021:         */
022:
023:        package de.laures.cewolf.util;
024:
025:        import java.awt.Color;
026:        import java.awt.Dimension;
027:        import java.awt.Graphics2D;
028:        import java.awt.Rectangle;
029:        import java.awt.geom.Rectangle2D;
030:        import java.awt.image.BufferedImage;
031:        import java.io.ByteArrayOutputStream;
032:        import java.io.IOException;
033:        import java.io.OutputStreamWriter;
034:        import java.util.Iterator;
035:        import java.util.List;
036:
037:        import org.apache.batik.dom.GenericDOMImplementation;
038:        import org.apache.batik.svggen.SVGGeneratorContext;
039:        import org.apache.batik.svggen.SVGGraphics2D;
040:        import org.apache.commons.logging.Log;
041:        import org.apache.commons.logging.LogFactory;
042:        import org.jfree.chart.ChartRenderingInfo;
043:        import org.jfree.chart.ChartUtilities;
044:        import org.jfree.chart.JFreeChart;
045:        import org.jfree.chart.block.RectangleConstraint;
046:        import org.jfree.chart.entity.StandardEntityCollection;
047:        import org.jfree.chart.title.LegendTitle;
048:        import org.jfree.ui.RectangleEdge;
049:        import org.w3c.dom.DOMImplementation;
050:        import org.w3c.dom.Document;
051:
052:        import com.sun.image.codec.jpeg.JPEGCodec;
053:        import com.sun.image.codec.jpeg.JPEGEncodeParam;
054:        import com.sun.image.codec.jpeg.JPEGImageEncoder;
055:
056:        import de.laures.cewolf.CewolfException;
057:        import de.laures.cewolf.ChartImage;
058:        import de.laures.cewolf.ChartRenderingException;
059:        import de.laures.cewolf.ConfigurationException;
060:        import de.laures.cewolf.WebConstants;
061:
062:        /**
063:         * Renderer for ChartImageDefinitions.
064:         *
065:         * @author glaures
066:         * @author tbardzil
067:         * @see    de.laures.cewolf.ChartImage
068:         */
069:        public class Renderer implements  WebConstants {
070:
071:            private final static Log log = LogFactory.getLog(Renderer.class);
072:
073:            /** Creates a new instance of Renderer */
074:            private Renderer() {
075:            };
076:
077:            /**
078:             * Renders a chart image
079:             *
080:             * @param  cd                  the chart to render
081:             * @return                     the rendered image
082:             * @throws CewolfException
083:             */
084:            public static RenderedImage render(ChartImage cd, Object chart)
085:                    throws CewolfException {
086:                log.debug("rendering " + cd);
087:                switch (cd.getType()) {
088:                case ChartImage.IMG_TYPE_CHART:
089:                    return renderChart(cd, chart);
090:                case ChartImage.IMG_TYPE_LEGEND:
091:                    return renderLegend(cd, chart);
092:                default:
093:                    throw new ConfigurationException(cd.getType()
094:                            + " is not a supported image type");
095:                }
096:            }
097:
098:            /**
099:             * Renders a chart
100:             * @param cd the chart image to be rendered
101:             * @return the rendered image
102:             * @throws CewolfException
103:             */
104:            private static RenderedImage renderChart(ChartImage cd, Object chart)
105:                    throws CewolfException {
106:                try {
107:                    final ByteArrayOutputStream baos = new ByteArrayOutputStream();
108:                    final ChartRenderingInfo info = new ChartRenderingInfo(
109:                            new StandardEntityCollection());
110:                    final String mimeType = cd.getMimeType();
111:                    if (MIME_PNG.equals(mimeType)) {
112:                        handlePNG(baos, (JFreeChart) chart, cd.getWidth(), cd
113:                                .getHeight(), info);
114:                    } else if (MIME_JPEG.equals(mimeType)) {
115:                        handleJPEG(baos, (JFreeChart) chart, cd.getWidth(), cd
116:                                .getHeight(), info);
117:                    } else if (MIME_SVG.equals(mimeType)) {
118:                        handleSVG(baos, (JFreeChart) chart, cd.getWidth(), cd
119:                                .getHeight());
120:                    } else {
121:                        throw new RenderingException("Mime type " + mimeType
122:                                + " is unsupported.");
123:                    }
124:                    baos.close();
125:                    return new RenderedImage(baos.toByteArray(), mimeType, info);
126:                } catch (IOException ioe) {
127:                    log.error(ioe);
128:                    throw new ChartRenderingException(ioe.getMessage(), ioe);
129:                }
130:            }
131:
132:            /**
133:             * Handles rendering a chart as a PNG. Currently this method is synchronized
134:             * because of concurrency issues with JFreeChart.
135:             *
136:             * @param  baos
137:             * @param  chart
138:             * @param  width
139:             * @param  height
140:             * @param  info
141:             * @throws IOException
142:             */
143:            private static synchronized void handlePNG(
144:                    ByteArrayOutputStream baos, JFreeChart chart, int width,
145:                    int height, ChartRenderingInfo info) throws IOException {
146:                ChartUtilities
147:                        .writeChartAsPNG(baos, chart, width, height, info);
148:            }
149:
150:            /**
151:             * Handles rendering a chart as a JPEG. Currently this method is synchronized
152:             * because of concurrency issues with JFreeChart.
153:             *
154:             * @param  baos
155:             * @param  chart
156:             * @param  width
157:             * @param  height
158:             * @param  info
159:             * @throws IOException
160:             */
161:            private static synchronized void handleJPEG(
162:                    ByteArrayOutputStream baos, JFreeChart chart, int width,
163:                    int height, ChartRenderingInfo info) throws IOException {
164:                ChartUtilities.writeChartAsJPEG(baos, chart, width, height,
165:                        info);
166:            }
167:
168:            /**
169:             * Handles rendering a chart as a SVG. Currently this method is synchronized
170:             * because of concurrency issues with JFreeChart.
171:             *
172:             * @param  baos
173:             * @param  chart
174:             * @param  width
175:             * @param  height
176:             * @throws IOException
177:             */
178:            private static synchronized void handleSVG(
179:                    ByteArrayOutputStream baos, JFreeChart chart, int width,
180:                    int height) throws IOException {
181:                OutputStreamWriter writer = new OutputStreamWriter(baos,
182:                        "UTF-8");
183:                DOMImplementation domImpl = GenericDOMImplementation
184:                        .getDOMImplementation();
185:                Document document = domImpl.createDocument("cewolf-svg", "svg",
186:                        null);
187:                SVGGeneratorContext ctx = SVGGeneratorContext
188:                        .createDefault(document);
189:                ctx
190:                        .setComment("Generated by Cewolf using JFreeChart and Apache Batik SVG Generator");
191:                SVGGraphics2D svgGenerator = new SVGGraphics2D(ctx, false);
192:                svgGenerator.setSVGCanvasSize(new Dimension(width, height));
193:                chart.draw(svgGenerator, new Rectangle2D.Double(0, 0, width,
194:                        height), null);
195:                svgGenerator.stream(writer, false);
196:                writer.close();
197:            }
198:
199:            //gets first legend in the list
200:            public static LegendTitle getLegend(JFreeChart chart) {
201:                //i need to find the legend now.
202:                LegendTitle legend = null;
203:                List subTitles = chart.getSubtitles();
204:                Iterator iter = subTitles.iterator();
205:                while (iter.hasNext()) {
206:                    Object o = iter.next();
207:                    if (o instanceof  LegendTitle) {
208:                        legend = (LegendTitle) o;
209:                        break;
210:                    }
211:                }
212:                return legend;
213:            }
214:
215:            //removes first legend in the list
216:            public static void removeLegend(JFreeChart chart) {
217:                List subTitles = chart.getSubtitles();
218:                Iterator iter = subTitles.iterator();
219:                while (iter.hasNext()) {
220:                    Object o = iter.next();
221:                    if (o instanceof  LegendTitle) {
222:                        iter.remove();
223:                        break;
224:                    }
225:                }
226:            }
227:
228:            /**
229:             * Renders a legend
230:             * @param cd the chart iamge to be rendred
231:             * @return the rendered image
232:             * @throws CewolfException
233:             */
234:            private static RenderedImage renderLegend(ChartImage cd, Object c)
235:                    throws CewolfException {
236:                try {
237:                    JFreeChart chart = (JFreeChart) c;
238:                    final int width = cd.getWidth();
239:                    final int height = cd.getHeight();
240:                    LegendTitle legend = getLegend(chart);
241:                    boolean haslegend = true;
242:
243:                    // with JFreeChart v0.9.20, the only way to get a valid legend,
244:                    // is either to retrieve it from the chart or to assign a new
245:                    // one to the chart. In the case where the chart has no legend,
246:                    // a new one must be assigned, but just for rendering. After, we
247:                    // have to reset the legend to null in the chart.
248:                    if (null == legend) {
249:                        haslegend = false;
250:                        legend = new LegendTitle(chart.getPlot());
251:                    }
252:                    legend.setPosition(RectangleEdge.BOTTOM);
253:                    BufferedImage bimage = ImageHelper.createImage(width,
254:                            height);
255:                    Graphics2D g = bimage.createGraphics();
256:                    g.setColor(Color.white);
257:                    g.fillRect(0, 0, width, height);
258:                    legend.arrange(g, new RectangleConstraint(width, height));
259:                    legend.draw(g, new Rectangle(width, height));
260:                    ByteArrayOutputStream out = new ByteArrayOutputStream();
261:                    JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
262:                    JPEGEncodeParam param = encoder
263:                            .getDefaultJPEGEncodeParam(bimage);
264:                    param.setQuality(1.0f, true);
265:                    encoder.encode(bimage, param);
266:                    out.close();
267:
268:                    // if the chart had no legend, reset it to null in order to give back the
269:                    // chart in the state we received it.
270:                    if (!haslegend) {
271:                        removeLegend(chart);
272:                    }
273:
274:                    return new RenderedImage(out.toByteArray(), "image/jpeg",
275:                            new ChartRenderingInfo(
276:                                    new StandardEntityCollection()));
277:                } catch (IOException ioex) {
278:                    log.error(ioex);
279:                    throw new ChartRenderingException(ioex.getMessage(), ioex);
280:                }
281:            }
282:
283:        }
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