Re: Windowless control draws wrongly in IE

Hi, I have a simple atl control built using VS 2003 which captures mouse
movements when the left button is depressed and draws the curve on the
screen in real time. The code in the OnDraw is included below. The
drawing works fine in hte test container - but in IE it has two definite
flaws - A) if I draw it to a large region then it seems to clip the line
(but not the rectangle) to a region with a top to bottom distance of about
200 and then redrarws the line periodically about 4-5 times own the window
against the grey background.

B) The mouse and the line are not properly aligned with each other - the
line appears in the wrong place - offset and slightly to the south of
where it should be. If I resize the IE window it pops back to the correct
position (at least when the object is set to occupy 100% of the window.

HRESULT OnDraw(ATL_DRAWINFO& di)
{
ATLTRACE(_T("OnDrawCalled\n"));
RECT& rc = *(RECT*)di.prcBounds;
HDC hdc = di.hdcDraw;
HDC & MemDC(hdc);
HBRUSH hOldBrush, hBrush;
HPEN hOldPen, hPen;
// Create and select the colors to draw the circle
hPen = (HPEN)GetStockObject(BLACK_PEN);
hOldPen = (HPEN)SelectObject(MemDC, hPen);
hBrush = (HBRUSH)GetStockObject(LTGRAY_BRUSH);
hOldBrush = (HBRUSH)SelectObject(MemDC, hBrush);
// Create and select the brush that will be used
Rectangle(MemDC, rc.left, rc.top, rc.right, rc.bottom);
if (m_Path.size()>= 2)
Polyline(MemDC, & m_Path[0],m_Path.size());
SetTextAlign(MemDC, TA_LEFT|TA_TOP);
LPCTSTR pszText = _T(/*"ATL 7.0 : GestCtl"*/m_strSignature.c_str());
TextOut(MemDC,
rc.left ,
rc.top + (rc.top + rc.bottom) / 20,
pszText,
lstrlen(pszText));
SelectObject(MemDC, hOldPen);
SelectObject(MemDC, hOldBrush);
DeleteObject(hBrush);

return S_OK;
}

The code is constructed using the standard wizards and is without
attributes. It works fine in the Activex Test Container (VS 2003),
poweropint although it still needs work to avoid flicker (suggestions?).