2012

90.6 degrees are invalid because the ellipse would otherwise appear as a straight
line. Multiples of these angle values result in a mirrored effect every 90 degrees.
Start Angle Defines the first endpoint of the elliptical arc. The Start Angle
option toggles from Parameter mode to Angle mode. The mode controls how
the ellipse is calculated.
Parameter Requires the same input as Start Angle, but creates the elliptical
arc using the following parametric vector equation:
p(u) = c + a * cos(u) + b * sin(u)
where c is the center of the ellipse and a and b are its major and minor axes,
respectively.
■ End Parameter: Defines the end angle of the elliptical arc by using a
parametric vector equation. The Start Parameter option toggles from Angle
mode to Parameter mode. The mode controls how the ellipse is calculated.
■ Angle: Defines the end angle of the elliptical arc. The Angle option toggles
from Parameter mode to Angle mode. The mode controls how the ellipse
is calculated.
■ Included Angle: Defines an included angle beginning at the start angle.
Center
Creates an ellipse using a center point, the endpoint of the first axis, and the
length of the second axis. You can specify the distances by clicking a location
at the desired distance or by entering a value for the length.
468 | Chapter 6 E Commands