How to draw circles and arcs
Add circles and arcs with the corresponding item in the toolbar. Just click and drag inside the drawing panel. By holding the shift-key regular circles can be drawn.
How to draw lines and curves
Choose the line or curve tool from the toolbar. The curvature of the curved line can be adjusted with the control points.
Select the drawing element by dragging a selection frame over it. It can be rotated and scaled with the appropriate controlpoints.