t = 10.93 (slider from 0 to 40, step 0.01)
c = 1.7 (slider from 1 to 10, step 0.1)
T = 7.8 (slider from 2 to 10, step 0.1)
A = 1
λ: c * T
S1(x) = A * sin(2.0 * 3.141592653589793 / T * t - 2.0 * 3.141592653589793 * x / λ)
O: (0.0, S1(0.0))
d = 27 (slider from 0 to 50, step 0.1)
M: (d, S1(d))
O': (t / 2.0, y(O) - 4.0)
M': (t / 2.0, y(M) - 4.0)