Java Code Examples for org.jfree.chart.ChartUtilities#writeChartAsPNG()

/**
 * Controller that handles the chart generation for a question statistics
 * @param surveyDefinitionId
 * @param pageOrder
 * @param questionOrder
 * @param recordCount
 * @param response
 */
@Secured({"ROLE_ADMIN","ROLE_SURVEY_ADMIN"})
@RequestMapping(value="/chart/{surveyDefinitionId}/{questionId}")
public void generatePieChart(@PathVariable("surveyDefinitionId")  Long surveyDefinitionId,
							 @PathVariable("questionId")  Long questionId, 
							 HttpServletResponse response) {
	try {
		response.setContentType("image/png");
		long recordCount  = surveyService.surveyStatistic_get(surveyDefinitionId).getSubmittedCount();
		PieDataset pieDataSet= createDataset(questionId,recordCount);
		JFreeChart chart = createChart(pieDataSet, "");
		ChartUtilities.writeChartAsPNG(response.getOutputStream(), chart, 340 ,200);
		response.getOutputStream().close();
	} catch (Exception e) {
		log.error(e.getMessage(),e);
		throw (new RuntimeException(e));
	}
}
 

/**
 * @param out
 * @return extension png or jpg for usage as file name extension.
 */
public String write(final OutputStream out)
{
  final JFreeChart chart = getJFreeChart();
  final int width = getWidth();
  final int height = getHeight();
  String extension = null;
  try {
    if (getImageType() == JFreeChartImageType.PNG) {
      extension = "png";
      ChartUtilities.writeChartAsPNG(out, chart, width, height);
    } else {
      extension = "jpg";
      ChartUtilities.writeChartAsJPEG(out, chart, width, height);
    }
  } catch (final IOException ex) {
    log.error("Exception encountered " + ex, ex);
  }
  return extension;
}
 

public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
    String type = request.getParameter("type");
    CategoryDataset dataset = createDataset(type);
    JFreeChart chart = createChart(dataset, request);

    int imageHeight = Math.max(IMAGE_MIN_HEIGHT, 15 * dataset.getColumnCount());

    ChartUtilities.writeChartAsPNG(response.getOutputStream(), chart, IMAGE_WIDTH, imageHeight);
    return null;
}
 

private byte[] generateChart(JFreeChart chart, byte _format, int width, int height, ChartRenderingInfo info) throws IOException {
	ByteArrayOutputStream out = new ByteArrayOutputStream();
	if (_format == FORMAT_JPG)
		ChartUtilities.writeChartAsJPEG(out, chart, width, height, info);
	else
		ChartUtilities.writeChartAsPNG(out, chart, width, height, info);
	out.close();

	return out.toByteArray();
}
 

/**
 * Plots the chart and sends it in the form of ByteArrayOutputStream to
 * outside.
 * 
 * @return Returns the byteArrayOutputStream.
 */
public synchronized ByteArrayOutputStream writePlot ( ) {
   if ( !changed ) return byteArrayOutputStream;
   byteArrayOutputStream.reset( );
   try {
      ChartUtilities.writeChartAsPNG( byteArrayOutputStream , chart , width , height , false , 8 );
      
   } catch ( IOException e ) {
      logger.warn( e.getMessage( ) , e );
   }
   return byteArrayOutputStream;
}
 

public void createChartToOutputStream(DesignOptions options,
		ChartRenderingInfo renderingInfo, OutputStream outputStream) {
	try {
           Map<String, OXFFeatureCollection> entireCollMap = getFeatureCollectionFor(options, true);
           JFreeChart chart = producePresentation(entireCollMap, options);
           chart.removeLegend();
           int width = options.getWidth();
           int height = options.getHeight();
           ChartUtilities.writeChartAsPNG(outputStream, chart, width, height, renderingInfo);
       } catch (Exception e) {
           LOGGER.warn("Error while rendering chart.", e);
       }
}
 

public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException,
		ServletException {
	String action = WebUtils.getString(request, "action", "graph");
	String type = WebUtils.getString(request, "t");
	JFreeChart chart = null;
	updateSessionManager(request);

	try {
		if ("refresh".equals(action)) {
			new RepositoryInfo().runAs(null);
			ServletContext sc = getServletContext();
			sc.getRequestDispatcher("/admin/stats.jsp").forward(request, response);
		} else {
			response.setContentType("image/png");
			OutputStream out = response.getOutputStream();

			if (DOCUMENTS.equals(type) || DOCUMENTS_SIZE.equals(type) || FOLDERS.equals(type)) {
				chart = repoStats(type);
			} else if (DISK.equals(type)) {
				chart = diskStats();
			} else if (JVM_MEMORY.equals(type)) {
				chart = jvmMemStats();
			} else if (OS_MEMORY.equals(type)) {
				chart = osMemStats();
			}

			if (chart != null) {
				// Customize title font
				chart.getTitle().setFont(new Font("Tahoma", Font.BOLD, 16));

				// Match body {	background-color:#F6F6EE; }
				chart.setBackgroundPaint(new Color(246, 246, 238));

				// Customize no data
				PiePlot plot = (PiePlot) chart.getPlot();
				plot.setNoDataMessage("No data to display");

				// Customize labels
				plot.setLabelGenerator(null);

				// Customize legend
				LegendTitle legend = new LegendTitle(plot, new ColumnArrangement(), new ColumnArrangement());
				legend.setPosition(RectangleEdge.BOTTOM);
				legend.setFrame(BlockBorder.NONE);
				legend.setItemFont(new Font("Tahoma", Font.PLAIN, 12));
				chart.removeLegend();
				chart.addLegend(legend);

				if (DISK.equals(type) || JVM_MEMORY.equals(type) || OS_MEMORY.equals(type)) {
					ChartUtilities.writeChartAsPNG(out, chart, 225, 225);
				} else {
					ChartUtilities.writeChartAsPNG(out, chart, 250, 250);
				}
			}

			out.flush();
			out.close();
		}
	} catch (Exception e) {
		e.printStackTrace();
	}
}