Magnifier window for graphic display in mfc application

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My application has a graphic window which is used for graphical representation of a component which is to display in a tree. Some times the components are very large in numbers so the graph size is also huge.

In this situation it is difficult for me to see a particular component so I want to add a magnifier window so I can locate some of the particular components in the graph with this magnifier window, just like in Google maps. its just like if you remember when you play age of empire , one small window was there by which we can navigate to any desired area of kingdom.

Any help is greatly appreciated.

Posted 13-Apr-11 23:57pm

bitsmax

Updated 14-Apr-11 19:38pm

v3

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Slacker007 14-Apr-11 7:13am

Edited for grammar and spelling.

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KarstenK · Answer 1 · 2011-06-21T02:29:00

Solution 1

you need the complete picture/screen in a memory bitmap and than deflate it.

I like the code of that article because it is runnung fast: Add fast user-extensible image processing support to CBitmap[^]

Posted 21-Jun-11 2:29am

KarstenK

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bitsmax 11-Aug-11 1:54am

Hello KarstenK,
Thanks for reply.
could you please help me out in getting the bitmap of my view , as i am not able to get the bitmap.
currently i am taking the snapshot of my view and copy it on clipboard, but i ma not getting the image , it showing a dot only .
below is my code .. please have a look

CDC dc;

HDC hdc = ::GetDC(m_WndGraph->m_hWnd);
dc.Attach(hdc);

CDC memDC;
memDC.CreateCompatibleDC(&dc);

CBitmap bm;
CRect r;

m_WndGraph(that is my view)->GetClientRect(&r);

CString s;
m_WndGraph->GetWindowText(s);
CSize sz(r.Width(), r.Height());
bm.CreateCompatibleBitmap(&dc, sz.cx, sz.cy);
CBitmap * oldbm = memDC.SelectObject(&bm);
memDC.BitBlt(0, 0, sz.cx, sz.cy, &dc, 0, 0, SRCCOPY);

m_WndGraph->GetParent()->OpenClipboard();
::EmptyClipboard();
::SetClipboardData(CF_BITMAP, bm.m_hObject);
CloseClipboard();

memDC.SelectObject(oldbm);

KarstenK 11-Aug-11 4:06am

lives your bm bitmap on the point your are accessing the clipboard?

As debugging point you draw the bm in your view for checking you got your bits ;-)