Menu: Geometry->Create->Straight line
To create a straight line, start by entering just two points (see Point definition ), and then continue entering points in order to create more lines from the first one. Every part of the total line created is an independent line.
It is important to note that when creating lines, new points are also being created (if existing ones are not used).
The Close option joins the first point and the last point created with a straight line and finishes.
The Undo option undoes the creation of the last point (if new) and the last line. It is possible to continue undoing all the way back to the first point.
The Number option lets you choose the label that will be assigned to the next line created. If a line with this number already exists, the old line changes its number.
If Join is chosen, it is maintained for all points until No join is selected.