useful commands:
- distance/measuregeom
- zoom ext
- line
- trim: pirma žymėti ribą, tada -- po truputį, ką kiripti
- offset
- "signature": sketch
- donut
- xline: for coordinate axis (infinite lines)
- aeclayerorder
- multiline (ml) -- dvi lygiagrečios linijos
- polyline - vientisa kampuota linija.

- f8: perpendicular
- f2: console

questions:
- what to click to create an xline with the same offset (accept suggestion)?
- how to draw a semicircular? construction line: xl, bisect.
- how to add a dimension text (kelio ašis)? dt (dtext).
- how to make a legend? line type.
- how to add labels to the coordinate system?
- how to scale the overlay sheet of paper? stretch.