A = Point(xAxis)
Δx = 3.3 (slider from -5 to 5, step 0.1)
A': (x(A) + Δx, 0)
u = Vector(A, A')
a = Line(A, yAxis)
b = Line(A', yAxis)
B = Midpoint(A, A')
c = Line(B, yAxis)
C = Point(c)
D = Point(a)
D' = Mirror(D, C)
v = Vector(D, D')
d = Line(D, xAxis)
e = Line(D', xAxis)
E = Intersect(yAxis, d)
F = Intersect(e, yAxis)
w = Vector(E, F)