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;
}
/** 円チャート用ツールチップ設定メソッド */
public void setToolTipForPie(Document doc) {
Element root = doc.getDocumentElement();
Element chartInfo = (Element) root.getElementsByTagName("ChartInfo").item(0);
String hasToolTip =
chartInfo.getElementsByTagName("hasToolTip").item(0).getFirstChild().getNodeValue();
// ツールチップ有り
if ("1".equals(hasToolTip)) {
PiePlot piePlot = this.getPiePlot();
piePlot.setToolTipGenerator(new StandardPieItemLabelGenerator());
}
// ツールチップ無し
else {
// 何もしない（ツールチップ表示しない）
}
}
/**
* Creates a chart containing multiple pie charts, from a TableDataset.
*
* @param title the chart title.
* @param data the dataset for the chart.
* @param extractType <code>PER_ROW</code> or <code>PER_COLUMN</code> (defined in {@link
* PiePlot}).
* @param legend a flag specifying whether or not a legend is required.
* @param tooltips configure chart to generate tool tips?
* @param urls configure chart to generate URLs?
* @return a pie chart.
*/
public static JFreeChart createPieChart(
String title,
java.awt.Font titleFont,
CategoryDataset data,
TableOrder order,
boolean legend,
boolean tooltips,
boolean urls,
PieURLGenerator urlGenerator) {
MultiplePiePlot plot = new MultiplePiePlot(data);
plot.setDataExtractOrder(order);
PiePlot pp = (PiePlot) plot.getPieChart().getPlot();
// pp.setInsets(new Insets(0, 5, 5, 5));
pp.setBackgroundPaint(null);
// no outline around each piechart
pp.setOutlineStroke(null);
// plot.setOutlineStroke(null);
PieToolTipGenerator tooltipGenerator = null;
if (tooltips) {
tooltipGenerator = new StandardPieToolTipGenerator();
}
// PieURLGenerator urlGenerator = null;
if (!urls) {
urlGenerator = null;
}
pp.setToolTipGenerator(tooltipGenerator);
pp.setLabelGenerator(null);
pp.setURLGenerator(urlGenerator);
JFreeChart chart = new JFreeChart(title, titleFont, plot, legend);
return chart;
}
