Add Directed Line
Directed line connects vertices. Directed line may have weight or could be unweighted. Directed lines can be directed graph and ordinary (undirected) graph.
How to add directed line
In order to add a directed line you have to choose "Connect vertices" in the menu bar. Then you should select starting vertex and click on the finishing vertex. Thus, you will see the table:
You can enter the weight of the directed line or choose unweighted edge. Then you have to click on the "Oriented" or "Non-oriented" button to create the directed line, which corresponds to your demand.
Various types of directed lines:
How to erase a directed line
In order to delete a directed line you have to click on "Delete" button and then click on a directed line.