A = Point(xAxis)
Δx = 2.7 (slider from -5 to 5, step 0.1)
A': (x(A) + Δx, 0)
Δy = 1.1 (slider from -5 to 5, step 0.1)
B = Point(yAxis)
B': (0, y(B) + Δy)
AA' = Vector(A, A')
BB' = Vector(B, B')
e = Line(A, yAxis)
f = Line(A', yAxis)
b = Line(B, xAxis)
c = Line(B', xAxis)
C = Intersect(e, b)
C' = Intersect(c, f)
g = Vector(C, C')