I have an area spline chart with positive and negative values that I am trying to stack. Ideally, negative values fall below the 0 mark, positive values go above. For some reason, the area charts don't behave this way (see screenshot). Column charts work fine. Any ideas?
I think the way to address this is a Highcharts setting that we don't currently set: threshold. It looks like it's particular to Area/Areaspline charts, but I wasn't familiar with it before today, so I can't say for sure. Here's a jsFiddle showing it in action. At present, you'll have to set this with a Before Render Snippet on your Chart to set it. Does that help?