patterns — phasebars

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source — gen_a.g06_phasebars

def g06_phasebars(rng):
    """PHASE BARS — one full-height bar per cell, width modulated by a sine whose
    phase advances down the column. The stack shears into a travelling wave."""
    N = 50
    c = Canvas(N, "GEOMETRIC", "squares", "phasebars", tiles=True)
    C = c.C
    P = rng.choice([5, 6, 8, 10])
    Q = rng.choice([12, 16, 20, 25])
    skew = rng.uniform(-0.6, 0.6)
    base = rng.uniform(0.34, 0.46)
    amp = rng.uniform(0.26, 0.40)
    for i in range(N):
        for j in range(N):
            ph = (i / P + j / Q + skew * (i * j) / (N * N)) * math.tau
            w = base + amp * math.sin(ph)
            if w > 0.02:
                x, y = c.center(i, j)
                c.rect(x, y, w * C, C)
    return c

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