EulerGT / Graph editing
Graph editing works mainly with a mouse. We use left mouse button to
work with vertices and right mouse button to work with edges.
Vertex or line can be selected with a single click. With a click
and draging it can be moved, with a double click its properties can be
By using the SHIFT key, we can select more than one
vertex or line, all other operations work on selected group.
By using the CTRL key, we can add a new vertex and/or
lines starting in selected vertices.
By using the ALT key, we can delete vertices and lines.