Construction line entities are generally used to setup boundaries within the Map Window. There are two types; the ray, and the infinite. The ray has a single end point, while the infinite construction line has no end point at all. Construction lines are easily located in the Map Window because they always extend beyond the borders of the drawing/map. You only need to zoom to the extents of the drawing to find them. A single infinite construction line is shown in the selected state below, along with several rays.




To draw a construction line, click in the Map Window where you want it to begin as a Ray if you have the "Ray" option checked in the pop-up mode menu. If you do not have that option checked, then wherever you click will become the central point of an infinite line which you adjust for angle with a second click.