Creating curves
Two curve types can be created, Quadratic and Cubic. If you select either from the "Create"
menu then a draft curve is drawn onto the grid with boxes indicating the control points for
the curves. The Quadratic has three boxes and the Cubic four boxes. By pressing the mouse
over these boxes and dragging them around the grid it is possible to manipulate the curves
as desired.
The control boxes can even be dragged outside the grid window but be warned that if you let
go of them while they are not visible you can't move them again!
Once the curve is in the shape you want, double click anywhere on the grid to draw the curves.
Even once a curve has been drawn, it can still be moved around the grid
with the arrow buttons as well as being rotated.