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Date Posted: 11:23:46 05/15/00 Mon
Author: Ted Slusser
Subject: Re: Envision is really cool! -- Yes, but...
In reply to: Michel 's message, "Re: Envision is really cool! -- Yes, but..." on 18:28:52 05/12/00 Fri

Hi Michel,

Thanks for the tip. I have windows 2000 and applied the changes you recommended but there is no field named FStartMousePos in either the TDragMouseHandler or the TImageScrollBox. I just removed the reference to the FStartMousePos and tried the changes but I didn't notice a change in the redraw speed.

Scrolling the image is not a big problem; the slowdown only occurs when the ImageScrollBox is being resized. I stepped through the source code and it actually takes about .75 seconds to return from the StretchDiBits function. I can send you a sample project to test on your machine if that would help. I hope that it is something simple I am missing.

I would like to say that I really like the Envision library and I appreciate the excellent support that you are giving.


> Hi Ted,
> I think it is actually the VCL base class
> TScrollingWinControl that is not very fast.
> StretchDiBits is usually quite fast. I decided to
> derive from TScrollingWinControl for code reuse, and
> to stay close to the VCL, which is the same idea why
> all graphic classes in Envision derive from TGraphic.
> I have done some testing and the scrolling in the VCL
> scroll box is quite slow especially on NT. If you look
> at the post, Flickering on NT 09:29:47 03/18/00 Sat,
> there is an improvement there to be made.
> Envision is not as full featured and some parts are
> not as optimized as some commercial libraries, but I
> will continue to improve it.
> Best regards,
> Michel

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