At 09:33 PM 11/7/00, Steven Sacks wrote:
>Hello. I need some math help.
>
>I need to compute remaining time based on
>a total frame count compared to the current frame.
>It's a 10fps movie.
>
>Here's the elapsed time script.
Here's one way:
on computeTime totalFrames, rate
unitsLeft = totalFrames - the frame
secs = 0
mins = 0
secs = unitsLeft / rate
if secs >= 60 then
mins = secs / 60
secs = secs mod 60
end if
mins = string(mins)
secs = string(secs)
if mins.char.count < 2 then mins = "0" &mins
if secs.char.count < 2 then secs = "0" &secs
return mins &":" &secs
end
put computeTime(the lastFrame,10)
-- "00:20"
But this reminds me that some years ago, I wrote a somewhat intricate set
of handlers to allow a user to convert frames to SMPTE time & back again
with a simple calculator thrown in. Then somebody happened to mention
Lingo's framesToHMS and HMStoFrames functions. I went back to that older
version of Dir & sure enough, those commands were available even then!
So . . .
on computeTimeLeft totalFrames, rate
framesLeft = totalFrames - the frame
return framesToHMS(framesLeft,rate,0,1)
end
put computeTimeLeft(the lastFrame,10)
-- " 00:00:20.02 "
It even has a DROP FRAME switch!!!
--
Mark A. Boyd
Keep-On-Learnin' :)
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