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General Parabola Equation

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2
(-0.31x-0.95y-0.12)
-
2
(0.74+x)
-
2
(-2.62+y)
Let the equation of the directrix of a parabola be the normalized line
Ax+By+C=0
, where the point
(A,B)
is on the unit circle. Let the focus be
(
f
1
,
f
2
)
. The equation of the parabola is then
2
(Ax+By+C)
=
2
(x-
f
1
)
+
2
(y-
f
2
)
.
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