How to add minor division lines to a chart?

[kisvegabor]

@zapta

That’s a good point, does the LVGL callback indicates the end of the grid rendering or does the user need to figure it on their own?

I made some tests and haven’t found straightforward points where the skipped lines can be drawn. LVGL send part draw events before and after

1. the main part (the background rectangle) is drawn
2. every divisor lines

Theoretically, the best would be to send an event after the last divisor line but before drawing the series, right?