live:
variable name:
strength:
length:

• move vertex

  Vertices are draggable.

• create vertex

  Click on empty space not too close to existing vertices.

• select a vertex

  Click on existing vertex.

• create/erase edge

  Select the first vertex. Click on another vertex (different than the selected one) to turn on/off (toggle) the edge between them.

• keep the selected vertex

  Hold 'SHIFT' to perserve the selected vertex after creating/erasing an edge.

• delete vertex

  Double click on vertex or drag to the edge for the frame (be careful, there is no UNDO yet!).