拋物線的定義
Author: 藍邦偉  老師

A

拋物線的定義：

1. 移動F(焦點)
2. 移動A,B兩點，
    形成準線

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Start

F = (3, 1)
B = (5, -3)
C = (2, -3)
a = Line(B, C)
D = Point(a)
b = OrthogonalLine(D, a)
c = Segment(F, D)
d = LineBisector(F, D)
P = Intersect(d, b)
軌跡1 = Locus(P, D)
e = Segment(F, P)
f = Circle(P, F)
P_1: (x(Corner[1]), 0)
P_2: (x(Corner[2]), 0)
u = Vector(P_1, P_2)
P_3: (0, y(Corner[1]))
P_4: (0, y(Corner[3]))
v = Vector(P_3, P_4)
g = Segment(P, D)
T_1 = Corner(1)
T_4 = Corner(4)
T_2: (4 * Corner[1] + Corner[2]) / 5
T_3: (4 * Corner[4] + Corner[3]) / 5
多邊形1, t_1, t_2, t_3, t_4 = Polygon(T_1, T_2, T_3, T_4)
h = Segment(T_2, T_3)
i = OrthogonalLine(F, a)
A = Intersect(i, a)