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The foci of the
Ellipse
. They are located on the major axis of theEllipse
at a distance oflinear_eccentricity
fromcenter
, on opposite sides of the minor axis.
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 foraxis_h
and v foraxis_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 theEllipse
is circular (but not an object of typeCircle
!), and a = b = v/2 = h/2.The linear eccentricity is the distance along the major axis of the
Ellipse
fromcenter
tofocus0
andfocus1
.
The numerical eccentricity \epsilon of the
Ellipse
, such that \epsilon = e/a < 1, where e is the linear eccentricity of theEllipse
, and a is half the length of the major axis of theEllipse
.