Esempio n. 1
1
 private static JFreeChart createChart(CategoryDataset categorydataset) {
   JFreeChart jfreechart =
       ChartFactory.createBarChart(
           "Bar Chart Demo 1",
           "Category",
           "Value",
           categorydataset,
           PlotOrientation.VERTICAL,
           true,
           true,
           false);
   CategoryPlot categoryplot = (CategoryPlot) jfreechart.getPlot();
   categoryplot.setDomainGridlinesVisible(true);
   categoryplot.setRangeCrosshairVisible(true);
   categoryplot.setRangeCrosshairPaint(Color.blue);
   NumberAxis numberaxis = (NumberAxis) categoryplot.getRangeAxis();
   numberaxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
   BarRenderer barrenderer = (BarRenderer) categoryplot.getRenderer();
   barrenderer.setDrawBarOutline(false);
   GradientPaint gradientpaint =
       new GradientPaint(0.0F, 0.0F, Color.blue, 0.0F, 0.0F, new Color(0, 0, 64));
   GradientPaint gradientpaint1 =
       new GradientPaint(0.0F, 0.0F, Color.green, 0.0F, 0.0F, new Color(0, 64, 0));
   GradientPaint gradientpaint2 =
       new GradientPaint(0.0F, 0.0F, Color.red, 0.0F, 0.0F, new Color(64, 0, 0));
   barrenderer.setSeriesPaint(0, gradientpaint);
   barrenderer.setSeriesPaint(1, gradientpaint1);
   barrenderer.setSeriesPaint(2, gradientpaint2);
   barrenderer.setLegendItemToolTipGenerator(
       new StandardCategorySeriesLabelGenerator("Tooltip: {0}"));
   CategoryAxis categoryaxis = categoryplot.getDomainAxis();
   categoryaxis.setCategoryLabelPositions(
       CategoryLabelPositions.createUpRotationLabelPositions(0.52359877559829882D));
   return jfreechart;
 }
  public String generateBarChart(
      String hitSection, HttpSession session, PrintWriter pw, String courseId, int studentId) {
    /* int groupId=0;
                if (groupName.equals("All")){
                    groupId=0;
                }else{
                     groupId = studStatisticBean.getGroupIdByName(groupName);
    }*/

    String filename = null;
    try {
      //  Retrieve list of WebHits
      StudentsConceptChartDataSet cDataSet =
          new StudentsConceptChartDataSet(studStatisticBean, courseId, studentId);
      ArrayList list = cDataSet.getDataBySection(hitSection);

      //  Throw a custom NoDataException if there is no data
      if (list.size() == 0) {
        System.out.println("No data has been found");
        throw new NoDataException();
      }

      //  Create and populate a CategoryDataset
      Iterator iter = list.listIterator();
      DefaultCategoryDataset dataSet = new DefaultCategoryDataset();
      while (iter.hasNext()) {
        StudentsConceptHit wh = (StudentsConceptHit) iter.next();
        // Comparable c1= Double.parseDouble(wh.getHitDegree());
        dataSet.addValue(
            wh.getHitDegree(),
            "degree of mastery for concept ",
            String.valueOf(wh.getHitConcept()));
      }

      //  Create the chart object
      CategoryAxis categoryAxis = new CategoryAxis("Concepts");
      ValueAxis valueAxis = new NumberAxis("Degree of Mastery");
      valueAxis.setRange(0.0, 6.0);
      categoryAxis.setCategoryLabelPositions(
          new CategoryLabelPositions().createUpRotationLabelPositions(45));
      BarRenderer renderer = new BarRenderer();
      renderer.setDrawBarOutline(true);
      renderer.setItemURLGenerator(
          new StandardCategoryURLGenerator("xy_chart.jsp", "series", "section"));
      StandardCategoryToolTipGenerator scttg = new StandardCategoryToolTipGenerator();

      renderer.setToolTipGenerator(scttg);

      Plot plot = new CategoryPlot(dataSet, categoryAxis, valueAxis, renderer);

      JFreeChart chart = new JFreeChart("", JFreeChart.DEFAULT_TITLE_FONT, plot, true);
      chart.setBackgroundPaint(java.awt.Color.white);

      //  Write the chart image to the temporary directory
      ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());

      filename = ServletUtilities.saveChartAsPNG(chart, 600, 400, info, session);

      //  Write the image map to the PrintWriter
      ChartUtilities.writeImageMap(pw, filename, info);
      pw.flush();

    } catch (NoDataException e) {
      System.out.println(e.toString());
      filename = "public_nodata_500x300.png";
    } catch (Exception e) {
      System.out.println("Exception - " + e.toString());
      e.printStackTrace(System.out);
      filename = "public_error_500x300.png";
    }

    return filename;
  }