Re: Playing an image sequence in reverse

[James W. <jfc...@ya...>]

Thanks!
However, I still got the same output when I used this, Pipmak tried to find "an_anim_-1" and so on.
 
Here's my new code:
 
CODE*****************************************************************
 
cubic { "dummy1024.png", "dummy.png","dummy.png", "dummy.png", "dummy.png", "dummy.png"  }

local an_linkingBook = patch {face=1, x = 0, y = 0, image = "an_linkingBook/an_linkingBook_0.jpg" }
local animpos = 100

hotspotmap "hotspotmap.png"

hotspot {
  onmousedown = function()
    if animpos == 0 then 
      animpos = 100 
    else
      pipmak.schedule(
   0.04,
   function()
           animpos = math.mod(animpos - 1, 100) 
    an_linkingBook:setimage ("an_linkingBook/an_linkingBook_"  .. animpos .. ".jpg")
                                return 0.04
                        end
                )
      end
  end
}

CODE*****************************************************************
 
Does anyone see the problem? I sure can't.
 
Thanks,
  James
--- On Sun, 9/27/09, Urs Holzer <ur...@an...> wrote:


From: Urs Holzer <ur...@an...>
Subject: Re: Playing an image sequence in reverse
To: pip...@li...
Date: Sunday, September 27, 2009, 5:59 AM


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



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