Re: [Csgl-users] obscured control and context.ToImage()

[Lloyd D. <ll...@ga...>]

Hi !

I suspect that's more a "feature" than a bug ...

However here a few suggestion:
0. there is no attached image
1. why not draw to the bitmap (there is an example in <csgl>/example/cs) and
show it in a picture box, than the other way round ?
2. Refresh() will force immediate redraw, and Invalidate() ask for a redraw
(later in the event loop)

----- Original Message -----
From: "Aron Ernvik" <ar...@se...>
To: "CsGL users list" <csg...@li...>
Sent: Tuesday, March 18, 2003 7:23 PM
Subject: [Csgl-users] obscured control and context.ToImage()


> Hi all,
>
> I'm working on a volume rendering application where rendering a frame
might
> take several seconds. Because of this, I cache the most recently rendered
> image as a bitmap (using context.ToImage()) and in OnPaint() I just draw
> this bitmap if it is still valid, instead of rendering the whole scene
over.
>
> There seems to be a problem when the Control (which is not an
OpenGLControl
> but a "standard" control containing a ControlGLContext) is obscured by
> another window - there will be rubbish in the obscured parts of the
window.
> So when the front window is moved and my OnPaint() is called and I draw
the
> bitmap, the part that was not visible before will contain errors.
>
> The two attached images illustrate what happens. In "bad.jpg", the lower
> part of the image was obscured by the Task Manager at rendering time.
> "good.jpg" shows what it should look like.
>
> Is there any way I can force the whole control to be redrawn, even if
parts
> of it are not visible?
>
> Thanks for any help! Best regards
>
> Aron Ernvik
>
>
>
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