OpenEuphoria

Re: Win32 page flipping

• Posted by cgibin at bellsouth.net Jan 14, 2003
• 599 views

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- ----- Original Message ----- 
From: <Patrick.Barnes at transgrid.com.au>
Subject: Win32 page flipping


> I have several pages of graphics and text (wPuts'ed) that I wish to switch
> between without flickering.
> How do I draw graphics and text into a bitmap, so that I can blit it on to the
> screen in one go?

Hello,

Several options to choose from here.

1) use CS_OWNDC when you create your MainWindow
     or
2) Create a/or more CompatibleDC's (memory device context)

[example]

global function CreateCompatibleDC(atom hdc)
   return c_func(xCreateCompatibleDC, {hdc})
end function

hdc = GetDC(hwnd) 
memdc = CreateCompatibleDC(hdc) -- make sure we destroy this when we exit the
prog

if iMsg = WM_PAINT then -- BitBlt the memdc to the hdc
   BitBlt(hdc, 0, 0,601,455,memdc,0,0,SRCCOPY)    

Its alittle more complex than this simple message so I would suggest downloading
some of euman's examples or if you prefer to use win32lib I could send you an
pretty neat graphical demo that got Jordah started.

Regards,
[not really] Unknown

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