Node:Ellipse Data Members, Next:Ellipse Constructors and Setting Functions, Previous:Ellipse Reference, Up:Ellipse Reference
Point focus0  Protected variables 
Point focus1 
The foci of the Ellipse . They are located on the major axis of
the Ellipse at a distance of linear_eccentricity from
center , on opposite sides of the minor axis.

real linear_eccentricity  Protected variable 
The linear eccentricity of the Ellipse e, such that
e = \sqrta^2  b^2,
where a and b are half the lengths of the major
and minor axes, respectively. Let h stand for axis_h and v
for axis_v . If h>v, then a = h/2 and b = v/2. If v>h,
then a =v/2 and b = h/2. If h = v, then the Ellipse is
circular (but not an object of type Circle !), and a = b = v/2 = h/2.
The linear eccentricity is the distance along the major axis of the

real numerical_eccentricity  Protected variable 
The numerical eccentricity \epsilon of the Ellipse ,
such
that \epsilon = e/a < 1, where e is the linear eccentricity of the
Ellipse , and a is half the length of the major axis of the
Ellipse .

real axis_h  Protected variables 
real axis_v 
The horizontal and vertical axes, respectively, of the Ellipse .
Actually, they are only or vertical
horizontal by convention, since there are no restrictions on the
orientation of an 
unsigned short DEFAULT_NUMBER_OF_POINTS  Protected static variable 
The number of Points on an Ellipse , unless another number
is specified when an Ellipse constructor is invoked.
