This demo provides two ways to create nodes: 1. click on the panel under EDITING mode; 2. click "Generate random graph" after setting the dimension, number of nodes, transmission range. After you finish placing nodes by means of 1, 2 or both, you can click "Generate edges" to create links between nodes. There will be a link between two nodes if their distance is below the "transmission range". Under PICKING mode, you can move nodes to the desired position if you are not satisfied with its original position, then you can click "Generate edges" again to create the new links under the new locations of the nodes. Note, we don't support directional edges in "Generate edges".