中文说明：二维条件下，无线传感器网络覆盖模型为圆，采用虚拟力法，调节传感器节点位置，使覆盖率增大。设定该网络的传感器节点为40个，在长宽为800的区域，调用了覆盖函数，最终得到覆盖图，以及覆盖率曲线
English Description：
Two dimensional conditions, coverage model in wireless sensor networks using virtual force method, adjust the position of sensor nodes, the coverage increases. Set the sensor node network to 40, stretching for 800, cover function is called, the resulting overlays, as well as the coverage curve