A SpatialGraph contains a SpatialLinesDataFrame,
describing the network topology. This function adds line IDs
and direction arrows to an existing plot of a SpatialGraph.
textSGe(SG, acol='wheat', tcol='navyblue', arr.length=0.4)Arrows and edge IDs added to a SpatialGraph plot
SpatialGraph
color of the graph direction arrows
color of the text for graph edge IDs
length of the direction arrows