2D AUTO allows you to automatically create a 2D spline
through a path of minimum distance point entities that 
have been projected to the current construction plane.

The first position/point, second position/point, and
optional end position/point of an automatic spline define
its start and endpoints, and act as a direction guide 
for creation.

Change to the desired construction view and depth, and
indicate the start position of the spline. Note that the
Position Menu automatically defaults to the point entity
method, although you are not restricted to this option.

Choose the second point entity to define the direction and
start of the spline, using an option from the Position 
Menu.

Choose the final point through which the spline will pass,
using this menu. If you press <Enter>, the endpoint of the
spline will end at the 76th point entity passed through,
or until no more points are found on the screen.

All the point entities on the screen are sorted and
projected to the current construction plane.

Define the spline's start and end conditions by choosing
from the following options:

NATURAL - to automatically assign a curvature of zero to 
the appropriate end of the spline.

2 PTS - to specify a tangent vector at a spline endpoint 
by indicating two points (positions).

ENDENT - to specify a tangent vector by using the tangency
at the end of an existing curve entity.

TANGENT - to enter the x and y vector components 
(determining the slope y/x) and magnitude of the desired
tangent vector.

ANGLE - to determine the direction of a tangent vector by
setting the angle between the tangent vector and the
positive x axis.


Regardless of the 2D/3D construction-switch setting, the
indicated points are projected to the current construction
plane, and the spline is created in the current 
construction plane.
