a = 7 (slider from 0 to 7, step 0.01)
A1: (12.0 * random() - 4.0, 9.0 * random() - 4.0)
A2: (12.0 * random() - 4.0, 9.0 * random() - 4.0)
B1 = Segment(A1 - (a, 0.0), A1 - (0.0, a))
C1 = Segment(A1 - (0.0, a), A1 + (a, 0.0))
D1 = Segment(A1 + (a, 0.0), A1 + (0.0, a))
E1 = Segment(A1 + (0.0, a), A1 - (a, 0.0))
A3: (12.0 * random() - 4.0, 9.0 * random() - 4.0)
B2 = Segment(A2 - (a, 0.0), A2 - (0.0, a))
C2 = Segment(A2 - (0.0, a), A2 + (a, 0.0))
D2 = Segment(A2 + (a, 0.0), A2 + (0.0, a))
E2 = Segment(A2 + (0.0, a), A2 - (a, 0.0))
A4: (12.0 * random() - 4.0, 9.0 * random() - 4.0)
B3 = Segment(A3 - (a, 0.0), A3 - (0.0, a))
C3 = Segment(A3 - (0.0, a), A3 + (a, 0.0))
D3 = Segment(A3 + (a, 0.0), A3 + (0.0, a))
E3 = Segment(A3 + (0.0, a), A3 - (a, 0.0))
A5: (12.0 * random() - 4.0, 9.0 * random() - 4.0)
B4 = Segment(A4 - (a, 0.0), A4 - (0.0, a))
C4 = Segment(A4 - (0.0, a), A4 + (a, 0.0))
D4 = Segment(A4 + (a, 0.0), A4 + (0.0, a))
E4 = Segment(A4 + (0.0, a), A4 - (a, 0.0))
A6: (12.0 * random() - 4.0, 9.0 * random() - 4.0)
B5 = Segment(A5 - (a, 0.0), A5 - (0.0, a))
C5 = Segment(A5 - (0.0, a), A5 + (a, 0.0))
D5 = Segment(A5 + (a, 0.0), A5 + (0.0, a))
E5 = Segment(A5 + (0.0, a), A5 - (a, 0.0))
A7: (12.0 * random() - 4.0, 9.0 * random() - 4.0)
B6 = Segment(A6 - (a, 0.0), A6 - (0.0, a))
C6 = Segment(A6 - (0.0, a), A6 + (a, 0.0))
D6 = Segment(A6 + (a, 0.0), A6 + (0.0, a))
E6 = Segment(A6 + (0.0, a), A6 - (a, 0.0))
A8: (12.0 * random() - 4.0, 9.0 * random() - 4.0)
B7 = Segment(A7 - (a, 0.0), A7 - (0.0, a))
C7 = Segment(A7 - (0.0, a), A7 + (a, 0.0))
D7 = Segment(A7 + (a, 0.0), A7 + (0.0, a))
E7 = Segment(A7 + (0.0, a), A7 - (a, 0.0))
A9: (12.0 * random() - 4.0, 9.0 * random() - 4.0)
B8 = Segment(A8 - (a, 0.0), A8 - (0.0, a))
C8 = Segment(A8 - (0.0, a), A8 + (a, 0.0))
D8 = Segment(A8 + (a, 0.0), A8 + (0.0, a))
E8 = Segment(A8 + (0.0, a), A8 - (a, 0.0))
A10: (12.0 * random() - 4.0, 9.0 * random() - 4.0)
B9 = Segment(A9 - (a, 0.0), A9 - (0.0, a))
C9 = Segment(A9 - (0.0, a), A9 + (a, 0.0))
D9 = Segment(A9 + (a, 0.0), A9 + (0.0, a))
E9 = Segment(A9 + (0.0, a), A9 - (a, 0.0))
B10 = Segment(A10 - (a, 0.0), A10 - (0.0, a))
C10 = Segment(A10 - (0.0, a), A10 + (a, 0.0))
D10 = Segment(A10 + (a, 0.0), A10 + (0.0, a))
E10 = Segment(A10 + (0.0, a), A10 - (a, 0.0))