Polygon function Null safety
The Polygon function draws a polygon consisting of two or more vertices connected by straight lines. The polygon is outlined by using the current pen and filled by using the current brush and polygon fill mode.
BOOL Polygon( HDC hdc, const POINT *apt, int cpt );
int Polygon(int hdc, Pointer<POINT> apt, int cpt) => _Polygon(hdc, apt, cpt);