实现多点拟合圆操作，并且可以显示坐标，修改坐标值后，可重新显示图形，且可与原图形对比-Multi-point fitting circle operation, and can display the coordinates after modify the coordinate values ​ ​ can be re-display graphics, and comparison with the original graphics

一个DELPHI控件，图形处理文档操作控制，数据库多表处理-A DELPHI control, operation control graphics processing documents, databases, multi-table deal