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;
}
public static String getSimplePieChart(Map dataSource, String objectName, HttpSession session)
throws Throwable {
DefaultPieDataset dataset = new DefaultPieDataset();
Element chartObject =
XMLHandler.getElementByAttribute(getChartObjectList(), "name", objectName);
String title = chartObject.getAttributeValue("title");
int width = Integer.parseInt(chartObject.getAttributeValue("width"));
int height = Integer.parseInt(chartObject.getAttributeValue("height"));
Element LabelKeys = chartObject.getChild("Labels");
Element ValueKeys = chartObject.getChild("Values");
String valueKey = ValueKeys.getText();
String valueType = ValueKeys.getAttributeValue("type");
List labelKeys = LabelKeys.getChildren("Label");
String labelKey = LabelKeys.getText();
if (valueType.equalsIgnoreCase("number")) {
for (int i = 0; i < dataSource.size(); i++) {
Map rec = (Map) dataSource.get("ROW" + i);
Number value = (Number) rec.get(valueKey);
String label;
if (labelKeys.isEmpty()) {
label = DataFilter.show(rec, labelKey);
} else {
label = ((Element) labelKeys.get(i)).getText();
}
dataset.setValue(label, value);
}
} else {
for (int i = 0; i < dataSource.size(); i++) {
Map rec = (Map) dataSource.get("ROW" + i);
double value = (Double) rec.get(valueKey);
String label;
if (labelKeys.isEmpty()) {
label = DataFilter.show(rec, labelKey);
} else {
label = ((Element) labelKeys.get(i)).getText();
}
dataset.setValue(label, value);
}
}
JFreeChart chart =
ChartFactory.createPieChart3D(
title,
dataset,
chartObject.getAttribute("showLegend").getBooleanValue(),
chartObject.getAttribute("showToolTips").getBooleanValue(),
chartObject.getAttribute("urls").getBooleanValue());
PiePlot3D pie3dplot = (PiePlot3D) chart.getPlot();
float alpha = 0.7F;
if (chartObject.getAttribute("alpha") != null) {
alpha = chartObject.getAttribute("alpha").getFloatValue();
}
pie3dplot.setForegroundAlpha(alpha);
return ServletUtilities.saveChartAsPNG(chart, width, height, null, session);
}
