quaking_aspen.py 文件源码

def a_prod(sym):
    """Production rule for A"""
    ret = []
    w_d = sym.parameters["w"] / 14
    prev_rot = 0
    n = int(random() * 3 + 15.5)
    for ind in range(n):
        wid = sym.parameters["w"] - ind * w_d
        l_count = int((sqrt(n - ind) + 2) * 4 * sym.parameters["l"])
        ret.extend([LSymbol("!", {"w": wid}),
                    LSymbol("F", {"l": sym.parameters["l"] / 3}),
                    LSymbol("/", {"a": prev_rot + 140}),
                    LSymbol("&", {"a": 60}),
                    LSymbol("!", {"w": wid * 0.4}),
                    LSymbol("["),
                    LSymbol("F", {"l": sqrt(n - ind) * sym.parameters["l"] / 3,
                                  "leaves": l_count,
                                  "leaf_d_ang": 40,
                                  "leaf_r_ang": 140}),
                    LSymbol("^", {"a": random() * 30 + 30}),
                    LSymbol("F", {"l": sqrt(n - ind) * sym.parameters["l"] / 4,
                                  "leaves": l_count,
                                  "leaf_d_ang": 40,
                                  "leaf_r_ang": 140}),
                    LSymbol("%"),
                    LSymbol("]"),
                    LSymbol("!", {"w": wid}),
                    LSymbol("^", {"a": 60}),
                    LSymbol("\\", {"a": prev_rot + 140}),
                    LSymbol("+", {"a": -5 + random() * 10}),
                    LSymbol("^", {"a": -7.5 + random() * 15})])
        prev_rot += 140
    ret.append(LSymbol("F", {"l": sym.parameters["l"] / 2}))
    return ret