Thanks I will try that. I havew had trouble once using it. The whole screen flickered
after I set the LockWindowUpdate(0)
but I will give it a go.
Thanks.
Christopher Crowe (Software Developer)
Microsoft MVP, MCP
Adrock Software
Byte Computer & Software LTD
P.O Box 13-155
Christchurch
New Zealand
Phone/Fax (NZ) 03-3651-112
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On
> Behalf Of McKenzie, Paul
> Sent: Thursday, 27 May 1999 08:29
> To: Multiple recipients of list Delphi
> Subject: RE: [DUG]: Drawing Speed
>
>
> what about using LockWindowUpdate locking.
> ie.
>
> LockWindowUpdate(Handle);
> DoDrawPicture; // Your Drawing Function
> LockWindowUpdate(0);
>
> LockWindowUpdate in the Win32.hlp - it might provide some performance
> improvements. The picture will be all calculated and drawn while
> the window
> is locked the display will be the only thing done when the window is
> unlocked.
>
> HTH - It might not be enough for what your after though.
>
> Regards
> Paul
> [EMAIL PROTECTED]
>
>
> -----Original Message-----
> From: Chris Crowe [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, 27 May 1999 08:16 AM
> To: Multiple recipients of list Delphi
> Subject: [DUG]: Drawing Speed
>
>
> I am writing a custom scheduling control, which does a lot of
> drawing to the
> screen.
>
> Do stop flicker I have created a bitmap the size of the client area of the
> control. I then draw the interface to the bitmap, and then I draw
> the bitmap
> to the screen using Canvas.Draw(0,0, MyBitmap);
>
> I found this accetable when the control is small, but if it is say getting
> up to around 800 * 600 it takes a fair amount of time to draw. I have a
> timing component which states it takes 0.091 seconds on average
> to draw the
> image at the large screen size. You might say that it is quite fast. I
> suppose it is. But the control must support selecting of rows and
> scrolling
> of the window, much like a listbox.
>
> It is very much designed around the outlook/schedule plus style
> of their day
> view for their scheduling.
>
> Is there a faster way of drawing to the screen?, I have to draw to the
> bitmap becuase if I do not the screen flickers rather badly.
>
> Outlook draws very fast, and I assume my routines are quite optimized but
> obviosly not enough. So is there a better way, am I better to use
> BitBlt to
> draw to the screen than the Canvas.Draw()?
>
> Any other speed increasing tips would be greatly appreciated...
>
> ps: Does anyone know of a profiler that will profile a component,
> instead of
> the application?
>
> Chris
>
>
> Christopher Crowe (Software Developer)
> Microsoft MVP, MCP
>
> Adrock Software
> Byte Computer & Software LTD
> P.O Box 13-155
> Christchurch
> New Zealand
> Phone/Fax (NZ) 03-3651-112
>
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> Website: http://www.delphi.org.nz
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> Website: http://www.delphi.org.nz
>
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