Hi Chris, Thanks for the response..
But we need to keep track of the flow symbol in accordance with the source and sink position, not the drawing direction.
Just like in arcmap, if we reset the flow direction, it will show a black circle, not an arrow. Then, if we execute the set flow function, the arrow will appear, facing down from source to the sink.
Is there any ways to achieve this directly from the JS API or from python maybe?
At least, can't we get the information on a polyline, what's the flow status on that particular object?