In the Draft Workbench and the
BIM Workbench you can create geometry by picking points in the 3D view or by entering coordinates in the task panel of commands. Another way of selecting points is by snapping. Snapping allows to select exact geometric points on, or defined by, existing objects or the grid. You can for example snap to the endpoint of a line, to the center of a circle, or to the intersection of two edges.
Snapping to the endpoint of an edge
These tools are available in the Draft snap toolbar and in the Draft snap widget.
Note that circular edges do not have to be full circles.
Snap cycling 1: The red rectangle was created first therefore it has snap priority. Without snap cycling you cannot snap to the green rectangle where it is overlapped by the red rectangle.
Snap cycling 2: After using the snap cycle key once the green rectangle receives snap priority. Snapping to the midpoint of the overlapped green edge is now possible.
See also: Preferences Editor and Draft Preferences.