quaking_aspen.py 文件源码

def q_prod(sym):
    """Production rule for Q"""
    ret = []
    prev_ang = 0
    n = int(random() * 2 + 7)
    for ind in range(8):
        offset = 1 - (__base_width__ - sym.parameters["w"]) / __base_width__
        offset += ind / 8 / 12
        dang = 30 + 85 * offset
        if offset <= 0.7:
            b_len = 0.4 + 0.6 * offset / 0.7
        else:
            b_len = 0.4 + 0.6 * (1.0 - offset) / 0.3
        ret.extend([LSymbol("/", {"a": prev_ang + 75 + random() * 10}),
                    LSymbol("&", {"a": dang}),
                    LSymbol("!", {"w": sym.parameters["w"] * 0.08 * b_len}),
                    LSymbol("["),
                    LSymbol("F", {"l": sym.parameters["w"] / 2}),
                    LSymbol("A", {"w": 0.08 * b_len,
                                  "l": 0.6 * b_len}),
                    LSymbol("]"),
                    LSymbol("!", {"w": sym.parameters["w"]}),
                    LSymbol("^", {"a": dang}),
                    LSymbol("F", {"l": sym.parameters["l"]})])
    ret.append(LSymbol("Q", {"w": max(0, sym.parameters["w"] - __base_width__ / 11),
                             "l": sym.parameters["l"]}))
    return ret