Extract all nodes and edges that make up a graph.

Input parameters:

1. Gf → Graph to dissect.

Output parameters:

1. Nd → Locations of the graph nodes.
2. Nt → Topological classifications of the node.
3. Ei → Indices of all edges that connect to this node.
4. Ed → Line segments covering the graph edges.
5. Et → Topological classifications of the edge.
6. N0 → Index of source node.
7. N1 → Index of target node.