Re: Playing an image sequence in reverse

[Urs H. <ur...@an...>]

Hi

> I'm trying to run a JPEG image sequence in reverse order, but am
> running into problems:
> 
> Code:
> [...]
> animpos = math.mod(animpos - 1, 101)
> [...]

I guess this line is the problem. According to the Lua 5.0 reference, 
math.mod just uses the mod operator from ANSI C. If I remember 
correctly, ANSI C does define the result of it on a negative number as 
implementation specific, so, depending on the plattform the software 
runs on, math.mod(-1, 101) could be -1 or 100.

By replacing the above line with
if animpos < 0 then animpos = 100 end
should give what you want.

However, because of laziness, I have not tested it!

Greetings
Urs