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- ### 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!).