Question

What I’d like to do is have a RangeBarChart with it’s X-axis as dates. Currently adding new bars to a RangeCategorySeries spaces each bar equally, and there doesn’t appear to be a mechanism for manually specifying an X value, such as a Date. TimeSeries exists, but appears only to be for LineCharts.

Ideally what I’d need is a method add(min, max, date) on RangeCategorySeries.

Has anyone implemented this or have some tips for me? Thanks.

Answer 1

You can extend RangeCategorySeries and override toXYSeries(). I’ve pasted the current implementation of this method below for your reference. You can try changing this by setting the X value according to the date at each index.

public XYSeries toXYSeries() {
  XYSeries xySeries = new XYSeries(getTitle());
  int length = getItemCount();
  for (int k = 0; k < length; k++) {
    xySeries.add(k + 1, getMinimumValue(k));
    // the new fast XYSeries implementation doesn't allow 2 values at the same X,
    // so I had to do a hack until I find a better solution
    xySeries.add(k + 1.000001, getMaximumValue(k));
  }
  return xySeries;
}