Tools for Inputting Parallel Lines and Polygons
In addition to the normal tools, there is an option for lines and polygons which automatically creates the appropriate objects with a specified lateral spacing. If a positive distance is specified, the line is created to the right of the mouse cursor relative to input direction, and to left if a negative distance is specified in the ‘Tool options’ dialog.
In the example shown, the line is input automatically parallel to the wall between corners.