JFreeChart: remove gridlines on CombinedDomainXYPlot with PeriodAxis

Question

Context: Java swing application generating a chart using JFreeChart. The chart is a CombinedDomainXYPlot (using XYBarRenderer) that on the X-axis has a timeline based on PeriodAxis.

Problem: I can't remove the vertical gridlines (not the tickmarks related to the time periods) that separate days. What I tried is: combinedPlot.setDomainGridlinesVisible(false) which doesn't work (see image below).

Any hint would be more than welcome!

Thx, Thomas

Answer 1

After some additional research I found the mistake: for CombinedDomainXYPlot the setDomainGridlinesVisible(false) needs to be called on the subplots:

List<XYPlot> subplots = (List<XYPlot>) combinedPlots.getSubplots();
for (XYPlot p:subplots) p.setDomainGridlinesVisible(false);