public String generatePieChart( String hitOrdNum, 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 whDataSet = new StudentsConceptChartDataSet(studStatisticBean, courseId, studentId); ArrayList list = whDataSet.getDataBySection(hitOrdNum); // 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 PieDataSet DefaultPieDataset data = new DefaultPieDataset(); Iterator iter = list.listIterator(); while (iter.hasNext()) { StudentsConceptHit wh = (StudentsConceptHit) iter.next(); data.setValue(wh.getSection(), wh.getHitDegree()); } // Create the chart object PiePlot plot = new PiePlot(data); plot.setInsets(new Insets(0, 5, 5, 5)); plot.setURLGenerator(new StandardPieURLGenerator("xy_chart.jsp", "section")); plot.setToolTipGenerator(new StandardPieItemLabelGenerator()); 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; }
protected void buildChart() { DefaultCategoryDataset dataset = new DefaultCategoryDataset(); chart = ChartFactory.createMultiplePieChart( "Untitled Chart", dataset, org.jfree.util.TableOrder.BY_COLUMN, false, true, false); chart.setAntiAlias(true); // chartPanel = new ScrollableChartPanel(chart, true); chartPanel = buildChartPanel(chart); // chartHolder.getViewport().setView(chartPanel); setChartPanel(chartPanel); JFreeChart baseChart = (JFreeChart) ((MultiplePiePlot) (chart.getPlot())).getPieChart(); PiePlot base = (PiePlot) (baseChart.getPlot()); base.setIgnoreZeroValues(true); base.setLabelOutlinePaint(java.awt.Color.WHITE); base.setLabelShadowPaint(java.awt.Color.WHITE); base.setMaximumLabelWidth( 0.25); // allow bigger labels by a bit (this will make the chart smaller) base.setInteriorGap(0.000); // allow stretch to compensate for the bigger label width base.setLabelBackgroundPaint(java.awt.Color.WHITE); base.setOutlinePaint(null); base.setBackgroundPaint(null); base.setShadowPaint(null); base.setSimpleLabels(false); // I think they're false anyway // change the look of the series title to be smaller StandardChartTheme theme = new StandardChartTheme("Hi"); TextTitle title = new TextTitle("Whatever", theme.getLargeFont()); title.setPaint(theme.getAxisLabelPaint()); title.setPosition(RectangleEdge.BOTTOM); baseChart.setTitle(title); // this must come last because the chart must exist for us to set its dataset setSeriesDataset(dataset); }