A89: Re: Why does this slow down?
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A89: Re: Why does this slow down?
> I wrote a simple DrawClipString routine and tested it by writing a scrolling
> marquee program. It appears to scroll faster during the beginning and end
> (in other words, when there is less text on the screen). Can anybody explain
> why this is? I only tested it in VTI, not on a real calc. I'll probably make
> an effort to increase the routine's efficiency later, and this info might be
> useful. Source follows. Thanks.
You answered your own question: there is less text on screen, and therefore less
gfx to draw. DrawClipString (and all of TIOS:s DrawStr routines AFAIK) draw the
text character by character, and the clipping is smart enough to stop drawing
when the edge is reached. :)
--
/ Niklas Brunlid
Check out Prosit for the TI-89 / TI-92+ at http://prosit.ticalc.org
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