Article View: borland.public.cppbuilder.nativeapi
Article #5724Re: Overlay on camera display window
From: Remy Lebeau (TeamB)
Date: Sat, 23 Jul 2005 00:38
Date: Sat, 23 Jul 2005 00:38
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1849 bytes
"Hans-Jochen Trost" <dont-email@but.post-re.ply> wrote in message news:rh03e1pm0o0i7t274u6djcbcdne8m01tna@4ax.com... > I am thinking about a separate window, appropriately sized, with a > transparent background and the cross hair drawn on it, so sit on top > of the image display window (which is also the main program window). Why not just maintain a separate bitmap in memory, copy your images to it when needed, draw the cross directly onto it whenever you change it, and then have the main window simply render the current bitmap when needed? This is known as "double-buffering". > 2. If it is, how do I tell it to not display a title bar? Simply don't give the window the WS_CAPTION style. > 3. How do I tell it to have a transparent background? Give the window the WS_EX_TRANSPARENT style, and also intercept the WM_ERASEBKGND message to not actually draw any background. Gambit
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X-Google-Thread: 10cc67,5bf0f3f06cc6974f X-Google-Attributes: gid10cc67,public X-Google-Language: ENGLISH,ASCII-7-bit From: "Remy Lebeau \(TeamB\)" <no.spam@no.spam.com> Newsgroups: borland.public.cppbuilder.nativeapi References: <rh03e1pm0o0i7t274u6djcbcdne8m01tna@4ax.com> Subject: Re: Overlay on camera display window Date: Fri, 22 Jul 2005 17:38:51 -0700 Lines: 26 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 6.00.2800.1409 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 NNTP-Posting-Host: 68.69.17.41 Message-ID: <42e1926c$1@newsgroups.borland.com> X-Trace: newsgroups.borland.com 1122079340 68.69.17.41 (22 Jul 2005 17:42:20 -0700) Path: arc1-ca.pugleaf.net!g2news1.google.com!news4.google.com!news.glorb.com!news.moat.net!news-out.newsfeeds.com!propagator3-LAX.newsfeeds.com!news-in.newsfeeds.com!news-in.superfeed.net!caladan.landsraad.net!newsgroups.borland.com!not-for-mail