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Graphics g(GetSafeHwnd());
g.SetSmoothingMode(SmoothingModeAntiAlias);
PointF pointfs[3] = {PointF(20,20),PointF(150,50),PointF(50,150)};
g.DrawPolygon(&Pen(Color(200,255,255,0),2.0f),pointfs,3);
MoveTo(p1.x,p1.y);
LineTo(p2.x,p2.y); //p1->p2
LineTo(p3.x,p3.y); //p2->p3
LineTo(p1.x,p1.y); //p3->p1