获取CAD图形中圆的坐标，构成点矩阵，并提取计算其距离矩阵-CAD drawing circles to obtain the coordinates of a dot matrix form, and extracted calculate the distance matrix

通过坐标计算图幅编号。输入坐标点的X、Y值，计算坐标点所在图幅的图幅编号。-Calculation Sheet Numbers by coordinates. Enter the coordinates of the points X, Y value to calculate the coordinates of the point where the map sheet Sheet Number.

通过图幅编号计算坐标。输入图幅编号，计算图幅左下角的坐标值。-Calculate the coordinates by map sheet numbers. Enter Sheet Number, compute coordinate values lower left corner of the web of FIG.