t = 1.02 (slider from 0 to 6.283185307179586, step 0.01)
A = Point(xAxis)
C = Point(yAxis)
P_x: (x(A) * cos(t), 0.0)
P_y: (0.0, y(C) * sin(t))
P: P_x + P_y
a = Segment(P_x, P)
b = Segment(P_y, P)
r = Vector((0.0, 0.0), P)
B = (0, 0)
φ = Angle(A, B, P)