quaking_aspen.py 文件源码

def system():
    """initialize and iterate the system as appropriate"""
    axiom = []
    con = int(__base_length__ / 0.1)
    s = random() * 0.2 + 0.9
    for ind in range(con):
        axiom.append(LSymbol("!", {"w": s * (__base_width__ + ((con - ind) / con) ** 6 * 0.2)}))
        axiom.append(LSymbol("F", {"l": s * 0.1}))
    axiom.append(LSymbol("Q", {"w": s * __base_width__, "l": s * 0.1}))
    l_sys = LSystem(axiom=axiom,
                    rules={"Q": q_prod, "A": a_prod},
                    tropism=Vector([0, 0, 0.2]),
                    thickness=0.5,
                    bendiness=0,
                    leaf_shape=3,
                    leaf_scale=0.17,
                    leaf_bend=0.2)
    l_sys.iterate_n(12)
    return l_sys