说明：  no intro
(The judge polygon clock arrangement direction Very accurate (inaccurate have not encountered, almost three years). The correlation function of the function used in the document: 1.PtoLDistance-point to the straight line distance 2.CalcPolygonRect-polygon bounding rectangle 3.CalcSegmentRect-segment enclosing rectangle 4.Distance-calculate the distance between two points 5.ISZEROA-to determine if the value is zero The data type of the function of the Windows POINT, using a standard template vector)