对矢量数据进行点抽吸/精简，原理是在单位像素内，只保留唯一一个点，通过角度和像素2个权重值来控制精简力度-Vector data point suction/streamline, the principle is in units of pixels, leaving only the only one to control streamline efforts by the two weight values ​ ​ of the angle and pixel