Question on GDI???

[acsolu]

Recently, I am working on an image processing project. In the project, i need to create a selection first to define the region to be processed. here comes the problem, how can I do to draw the selection like that in photoshop as the picture below,

100% zoom ratio
http://www.codeguru.com/forum/attachment.php?attachmentid=9794&stc=1

800% zoom ratio
http://www.codeguru.com/forum/attachment.php?attachmentid=9795&stc=1



does anyone have any idea or advice on this??

any help will be appreciated.


Marco.

[Andreas Masur]

[ Moved thread ]

[andytim]

Hi,
You should create a new pen,such as:
// Prepare track line dc.
void CMYView::PrepareTrackLineDC(CDC *pDC)
{
pDC->SaveDC();
pDC->SelectObject(&m_penTrackLine);
pDC->SetROP2(R2_NOTXORPEN);
pDC->SelectStockObject(NULL_BRUSH);
}

// Clear track line dc.
void CMYView::ClearTrackLineDC(CDC *pDC)
{
pDC->RestoreDC(-1);
}

Then call pDC->Ellipse is enough!
:rolleyes:
Andy
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