画平滑曲线用API PolyBeZier来画二次曲线
PolyBezier(const Points: array of TPoint);
三次曲线:
BOOL PolyPolygon(
HDC hdc, // handle of device context
CONST POINT *lpPoints, // points to array of vertices for all polygons
CONST INT *lpPolyCounts, // points to array with count of vertices for each polygon
int nCount // count of polygons
);
