_pts->SetPoint(2, 1000 , 1000 , 0 );
_pts->SetPoint(3, -1000 , 1000 , 0 );
_pts->SetPoint(4, -1000 , 1000 , 0 );
_pts->SetPoint(5, -1000 , 1000 , 0 );
_pts->SetPoint(6, -1000 , 1000 , 0 );
_pts->SetPoint(7, -1000 , 1000 , 0 );
_pts->SetPoint(2, 1000 , 1000 , 0 );
_pts->SetPoint(3, -1000 , 1000 , 0 );
_pts->SetPoint(4, -1000 , 1000 , 0 );
_pts->SetPoint(5, -1000 , 1000 , 0 );
_pts->SetPoint(6, -1000 , 1000 , 0 );
_pts->SetPoint(7, -1000 , 1000 , 0 );