private JFreeChart makeChart() throws KeyedException {
if (chartSeries.size() == 0) throw new IllegalStateException("addChartSeries() not called");
if (range == null) {
for (ChartSeries s : chartSeries) {
if (range == null) range = s.getTimeSeries().getRange();
else range = range.union(s.getTimeSeries().getRange());
}
}
// use number axis for dates, with special formatter
DateAxis dateAxis = new DateAxis();
dateAxis.setDateFormatOverride(new CustomDateFormat("M/d/y"));
if (range.getTimeDomain().getLabel().equals("workweek"))
dateAxis.setTimeline(SegmentedTimeline.newMondayThroughFridayTimeline());
// combined plot with shared date axis
CombinedDomainXYPlot plot = new CombinedDomainXYPlot(dateAxis);
for (ChartSeries s : chartSeries) {
makeSubPlot(plot, s);
}
// make the chart, remove the legend, set the title
JFreeChart chart = new JFreeChart(plot);
if (!withLegend) chart.removeLegend();
chart.setBackgroundPaint(Color.white);
chart.setTitle(new TextTitle(title));
return chart;
}
private float getStrokeWidth() {
// determine the stroke width from the "density" of the data
return Math.max(1f, 3f - 0.4f * (range.getSize() / 100));
}