Re: XForms: Drawing on an image

T.C. Zhao (tc_zhao@yahoo.com)
Sat, 23 Oct 1999 14:39:00 -0700 (PDT)

# To subscribers of the xforms list from "T.C. Zhao" <tc_zhao@yahoo.com> :

The marking facility of image support (available soon)
will explicitly support this.

--- Todd Matthews <april3@flash.net> wrote:
> # To subscribers of the xforms list from Todd Matthews
> <april3@flash.net> :
>
> I have a large array of image data (1024x1024) bytes that I receive
> over
>
> the network. I need to draw several (100)
> grahics (circles, lines, and text) and then display the whole thing
> every couple of seconds.
>
> I have been able to create a canvas window and display an fl_image,
> then
>
> draw graphics on the canvas. The problem
> is that the graphics disappear between the time when the image is
> re-drawn and the graphics are re-drawn to the canvas.
> This causes an obvious flicker or flashing effect on the graphics.
>
> Is there a way to combine the image and graphics off screen, and then
> copy the whole thing at once?
>
> Todd Matthews
>
>
>
>
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=====

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