科赫曲线又称为雪花曲线,一种外形像雪花的几何曲线,是分形曲线中的一种。本代码利用迭代的方式绘制科赫曲线-Koch snowflake curve, also known as curve looks like a snowflake geometric curve is a fractal curve. The code to use an iterative approach to draw Koch curve