CRect rect;
	GetClientRect(&rect);

	double dAngle = angle*M_PI / 180.0;
	double tangens = tan(dAngle);
	double t = rect.Width() - tangens;
	double y1 = rect.bottom - t;

	POINT points[3] = { {0,clientRect.bottom}, {clientRect.right,y1}, {clientRect.right,clientRect.bottom}};

	CBrush hatchBrush;
	hatchBrush.CreateHatchBrush(HS_FDIAGONAL, RGB(120, 120, 56));
	CBrush *oldBrush = pDC->SelectObject(&hatchBrush);

	pDC->SetBkColor(RGB(50, 50, 50));

	pDC->Polygon(points, 3);