Fill from x-axis up in dygraph line plot -

Fill from x-axis up in dygraph line plot -

i fill line plot in dygraph x-axis , not 0 y-axis. if values positive, fill x-axis , up. however, if there negative values, fill 0 y-axis. there alternative fill x-axis?

the way write custom plotter.

but should think twice before doing this. if base of operations of fill changes zoom window, has no semantic meaning.

fill dygraphs