Dégradé Linéaire

A = (-0.0010381459735019916, -0.001038145973501936)
B = (-0.0010381459735019916, 0.598961854026498)
C = (0.9989618540264982, 0.598961854026498)
D = (0.9989618540264982, -0.001038145973501936)
a = Segment(A, D)