绘制线并添加到简单要素类，附加缓冲区分析，几何要素等，结合mapgis实现功能-Draw lines and added to a simple feature class, an additional buffer analysis, geometric elements, combined with mapgis implementation function

可以逃跑的按钮 便于基础的原理分析 很简单-Can escape button for easy analysis based on a very simple principle