A = Point(xAxis)
Δx = 2.7 (slider from -5 to 5, step 0.1)
A': (x(A) + Δx, 0)
B = Midpoint(A, A')
a = Line(B, yAxis)
e = Line(A, yAxis)
f = Line(A', yAxis)
C = Point(a)
D = Point(f)
b = Line(C, D)
E = Intersect(e, b)
c = Line(D, xAxis)
d = Line(E, xAxis)
F = Intersect(d, yAxis)
G = Intersect(c, yAxis)
u = Vector(F, G)
v = Vector(A, A')