I have a line chart. Often the lines overlap. When this happens, only the topmost line is visible. That's ok, but I'd like the data point tooltips to display not only the topmost value, but also the values of data points below it. Otherwise it's really hard to tell which data plots are under it and match the value. Is this clear enough?
I guess it could be done by checking which data points overlap and aggregating the tooltips, but that sounds complex. Is there any built-in way to show the data?
And another issue... I can drag the legend around the chart. How can I turn that off?