A new plugin is now available on market. Heatmap chart from APEX script.
You can create a Heatmap from a DB Thing. This will dynamically create labels and series for you and use count or you can use a third field to sum or avg.
Lot of options (colors, range, shade, radius, font…).
1 Element: Apex Heatmap Chart
1 Event: DataPoint Clicked (trigger a workflow when user click on a value)
3 States: Clicked Label, Clicked Series, Clicked Value
1 Action: Refresh data (you can use with workflow Do Every X sec)
More Apex Chart to come!