Inkscape tricks

1. Draw straight lines:
   1. click pencil button -> click once on your canvas(starting point) -> click another time to define your desitination.
   2. select object, push f2, then you can pull the node to rotate the lines.
2. Rotation: select your object, click once more, then you'll get the rotation signs.
3. Lines not horizontal or vertical?: Please push Ctrl when you are drawing a certain line.
4. Delete nodes: Ctrl + Delete