A directed graph's layer, given the selectors of the marks its series
painted.
The nodes are the last of those marks, one per node in data order, which
is the order the layer declares them in -- so they are the layer's
selectors exactly, one per declared node as DirectedGraphTrace reads
them.
A directed graph's layer, given the selectors of the marks its series painted.
The nodes are the last of those marks, one per node in data order, which is the order the layer declares them in -- so they are the layer's selectors exactly, one per declared node as
DirectedGraphTracereads them.