📄 xy_area_chart_code.jsp
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<html>
<head>
<link rel="stylesheet" href="sample.css" type="text/css"/>
<title>Timeseries Stacked Area Chart Creation Code</title>
</head>
<body>
<img src="images/top_bar.png" width=1004 height=75 border=0>
<table border=0>
<tr>
<td width=170><img src="images/spacer.png" width=170 height=1></td>
<td>
<h2>Timeseries Stacked Area Chart Creation Code</h2>
From org.jfree.chart.demo.servlet.WebHitChart (See also xy_chart.jsp)
<xmp>
public static String generateXYAreaChart(HttpSession session, PrintWriter pw) {
String filename = null;
try {
// Retrieve list of WebHits for each section and populate a TableXYDataset
WebHitDataSet whDataSet = new WebHitDataSet();
ArrayList sections = whDataSet.getSections();
Iterator sectionIter = sections.iterator();
DefaultTableXYDataset dataset = new DefaultTableXYDataset();
while (sectionIter.hasNext()) {
String section = (String)sectionIter.next();
ArrayList list = whDataSet.getDataByHitDate(section);
XYSeries dataSeries = new XYSeries(section, true, false);
Iterator webHitIter = list.iterator();
while (webHitIter.hasNext()) {
WebHit webHit = (WebHit)webHitIter.next();
dataSeries.add(webHit.getHitDate().getTime(), webHit.getHitCount());
}
dataset.addSeries(dataSeries);
}
// Throw a custom NoDataException if there is no data
if (dataset.getItemCount() == 0) {
System.out.println("No data has been found");
throw new NoDataException();
}
// Create tooltip and URL generators
SimpleDateFormat sdf = new SimpleDateFormat("dd-MMM-yyyy", Locale.UK);
StandardXYToolTipGenerator ttg = new StandardXYToolTipGenerator(
StandardXYToolTipGenerator.DEFAULT_TOOL_TIP_FORMAT,
sdf, NumberFormat.getInstance());
TimeSeriesURLGenerator urlg = new TimeSeriesURLGenerator(
sdf, "bar_chart.jsp", "series", "hitDate");
// Create the X-Axis
DateAxis xAxis = new DateAxis(null);
xAxis.setLowerMargin(0.0);
xAxis.setUpperMargin(0.0);
// Create the X-Axis
NumberAxis yAxis = new NumberAxis(null);
yAxis.setAutoRangeIncludesZero(true);
// Create the renderer
StackedXYAreaRenderer renderer =
new StackedXYAreaRenderer(XYAreaRenderer.AREA_AND_SHAPES, ttg, urlg);
renderer.setSeriesPaint(0, new Color(255, 255, 180));
renderer.setSeriesPaint(1, new Color(206, 230, 255));
renderer.setSeriesPaint(2, new Color(255, 230, 230));
renderer.setSeriesPaint(3, new Color(206, 255, 206));
renderer.setShapePaint(Color.gray);
renderer.setShapeStroke(new BasicStroke(0.5f));
renderer.setShape(new Ellipse2D.Double(-3, -3, 6, 6));
renderer.setOutline(true);
// Create the plot
XYPlot plot = new XYPlot(dataset, xAxis, yAxis, renderer);
plot.setForegroundAlpha(0.65f);
// Reconfigure Y-Axis so the auto-range knows that the data is stacked
yAxis.configure();
// Create the chart
JFreeChart chart = new JFreeChart(null, 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, 500, 300, 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;
}
</xmp>
<table border=0 cellpadding=2 width=400>
<tr>
<td align=left><a href="xy_area_chart.jsp">Back to the chart</a></td>
<td align=right><a href="index.html">Back to the home page</a></td>
</tr>
</table>
</td>
</tr>
</table>
</body>
</html>
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