1. RE: Win32 page flipping
Great, that should be what I need.
Yes, you're right; there are no controls in the window - just written directly.
Actually, I will just use a single v. large sized bitmap, and use stretchBlt to
transfer it, because the text sizes don't seem to scale well.
Thanks.
==============================================
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/ _____<--------------------__|===
| |_ <-------------------/
\__| Patrick Barnes
-----Original Message-----
From: Pete Lomax [mailto:petelomax at blueyonder.co.uk]
Sent: Tuesday, 14 January 2003 14:45
To: EUforum
Subject: Re: Win32 page flipping
On Tue, 14 Jan 2003 14:00:43 +1100, Patrick.Barnes at transgrid.com.au
wrote:
>
>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?
Flickering? Do you use repaintWindow() alot? I found I reduced alot of
flicker with surrounding toolbars, buttons, border etc which did not
need updating by invoking my oppaint routine directly.
Otherwise: I assume you already have code which writes direct to the
window, so use something like this:
size = getClientRect(win) -- returns {x1,y1,x2,y2}
size[3]-=size[1]
size[4]-=size[2]
If Bitmap=0 then --[**1**]
Bitmap=create(Pixmap,"",0,0,0,size[3],size[4],0)
end if
setCtlSize(Bitmap,size[3],size[4])
then setFont/setPenColor/drawRectangle/drawLine/bitBlt/stretchBlt/
setTextColor/wPuts as usual, only to your Bitmap, then just:
copyBlt(win, 0, 0, Bitmap)
Pete
[**1**] I create my bitmap precisely once, maximum size since I open
the window maximised, and resized it before each repaint.
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2. RE: Win32 page flipping
Hi Patrick,
Another source of flicker that I have found is the automatic background
erase that windows performs prior to WM_PAINT being issued. You can
prevent this by returning 1 to the WM_ERASEBKGND message for the window
you are blitting to.
There is also a good article on flicker-free drawing at:
http://freespace.virgin.net/james.brown7/tuts/flicker.htm
HTH,
Phil
Patrick.Barnes at transgrid.com.au wrote:
> 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?
> =======================
> Patrick Barnes
> Information Systems Group
> 201 Elizabeth St, Sydney
> Patrick.Barnes at transgrid.com.au
> Ext: 91-3583
> Ph:(02) 9284-3583
> Mob: 0410 751 044
>
>
> ***********************************************************************
>
>
> ***********************************************************************
>
>
3. RE: Win32 page flipping
How do you do that? Is that a win32lib thing, or an api thing?
-----Original Message-----
From: Phil Russell [mailto:pg_russell at lineone.net]
Subject: RE: Win32 page flipping
Hi Patrick,
Another source of flicker that I have found is the automatic background
erase that windows performs prior to WM_PAINT being issued. You can
prevent this by returning 1 to the WM_ERASEBKGND message for the window
you are blitting to.
There is also a good article on flicker-free drawing at:
http://freespace.virgin.net/james.brown7/tuts/flicker.htm
HTH,
Phil
Patrick.Barnes at transgrid.com.au wrote:
> 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?
> =======================
> Patrick Barnes
> Information Systems Group
> 201 Elizabeth St, Sydney
> Patrick.Barnes at transgrid.com.au
> Ext: 91-3583
> Ph:(02) 9284-3583
> Mob: 0410 751 044
>
>
> ***********************************************************************
>
>
> ***********************************************************************
>
>
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