应用数学函数关系，模拟生成大量具有对称性的唯美曲线，并保存输出到D盘目录下的曲线文件夹下（若无此文件夹请先创建再运行java代码）(Using mathematical function relations, simulate a large number of symmetric aesthetical curves, and save them to the curve folder under the D disk directory. If there is no such folder