Huub,
Sorry, I got mixed up about the frame numbers. I meant it went to the right
between 50 and 100. You can see what my swftools installation outputs at:
www.peachcobbler.uni.cc/changenegativebug.swf
I haven't been able to test it on 0.9 since I'm using windows and can't get it
to compile.
Huub Schaeks <[EMAIL PROTECTED]> wrote: .hmmessage P { margin:0px;
padding:0px } body.hmmessage { FONT-SIZE: 10pt; FONT-FAMILY:Tahoma } Jon
Looking at your example .sc file the box should move to the left between frame
1 and frame 50 then just a little bit more to the left until frame 100 then
just a little back to the right until frame 150 and to the right again back to
it's starting position. If I read your description correctly that is exactly
what it does.
The code you would like to patch actually works correctly. If I insert your
numbers I find:
p.x = (2 - 1) * 0.5 + 1 = 1.5
p.x = (-1.5 - (-1)) * 0.5 + (-1) = -1.25
There are some situations where the interpolation will fail in version 0.8.1
(resulting in some jittering).
Please use a more recent build than version 0.8.1 if possible. The
interpolation code for changing properties of objects in swfc has been
completely replaced.
Thanks for your time and effort.
Regards,
Huub
---------------------------------
Date: Sun, 6 Apr 2008 19:21:09 -0700
From: [EMAIL PROTECTED]
To: [email protected]
Subject: [Swftools-common] Bug in 0.8.1 with negative x/y changes < 1
First, thanks to Matthias and the rest of the coders for making swftools. It's
the most useful open-source software I've found for making flash files.
--bug:--
I've found that when you specify e.g.: ".change (object) x=-1.5" that it's
actually animated to where -0.5 would be on the x axis.
Example code:
.flash name="changenegativebug.swf" fps=50
.box b1 10 10 fill=white color=white
.put b1 x=0
.frame 50
.change b1 x=-3
.frame 100
.change b1 x=-3.5
.frame 150
.change b1 x=-3
.frame 200
.change b1 x=0
.end
Instead of moving the box just a little to the left between frames 100 and 150,
it moves it to the right.
--problem:--
I do some programming (mostly web programming -- PHP, CSS, HTML...) but I
looked through the source code for 0.8.1 and I'm guessing that this is the
problem is in swfc.c in the "parameters_t s_interpolate" function. (Lines 1856
& 1857) The current code is:
p.x = (p2->x-p1->x)*ratio + p1->x;
p.y = (p2->y-p1->y)*ratio + p1->y;
so:
if p2->x = 2 and p1->x = 1 and ratio=0.5 then p.x = 1.5
if p2->x = -1.5 and p1-> = -1 and ratio=0.5 then p.x = -0.75 (!)
--patch:--
I don't do any C programming, and this is probably not the most elegant
solution, but it demonstrates (I think) how to fix it:
if ((p2->x-p1->x)*ratio<0) {
p.x = (p2->x-p1->x)*ratio*-1 + p1->x;
} else {
p.x = (p2->x-p1->x)*ratio + p1->x;
}
if ((p2->y-p1->y)*ratio<0) {
p.y = (p2->y-p1->y)*ratio*-1 + p1->y;
} else {
p.y = (p2->y-p1->y)*ratio + p1->y;
}
Hopefully this very verbose (maybe too verbose) bug report helps.
Thanks again for the awesome swf tools.
Jon
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