Given a graph with weighted directed edges where the edges are complex numbers, I would like to display the graph in such a way that edges with different types of weights are drown in different colors. for examples edges with a weight where the Imaginary part is negative would be drawn in Red while edges where the imaginary part is positive would be drawn in Green. I have seen the use of HighlightGraph[..] but I don't see how I would specify to Highlight the graph given the above specification. I've seen the example that shows how to highlight one particular edge in one particular color, but can't seem to see how to specify that negatively weighted edges are to be Red while positively weighted ones are to be Green. Again, by positive and negative, I am referring to the sign of the imaginary part of the weight of the edge.