const int MAXX = 10;   // maximum X of game grid

const int MAXY = 15;   // maximum Y of game grid

const int WINDOW_WIDTH = 300;
const int WINDOW_HEIGHT = 300;

void DrawScreen()
{
	RECT myRect;
	RECT myWindowRect;
	int drawwidth = WINDOW_WIDTH / MAXX;
	int drawheight = WINDOW_HEIGHT / MAXY;

	hWindowDC = GetDC(hwndMain);
	hMemDC = CreateCompatibleDC(hWindowDC);

	GetClientRect(hwndMain, &myWindowRect);

	for (int i = 0; i < 4; i++)
	{
		myRect.left = currentBlock.myPoints[i].x * drawwidth;
		myRect.top = currentBlock.myPoints[i].y * drawheight;
		myRect.bottom = myRect.top + drawheight;
		myRect.right = myRect.left + drawwidth;
	
		FillRect(hMemDC, &myRect, HBRUSH(GetStockObject(BLACK_BRUSH)));
	}

	BitBlt(hWindowDC, 0, 0, myWindowRect.right, myWindowRect.bottom, hMemDC, 0, 0, SRCCOPY);

	DeleteDC(hMemDC);
	ReleaseDC(hwndMain, hWindowDC);
}