[swfmill] swf2xml question

[Sebastian Lucas]

Hi Dan,
Thank you so much for your reply and yes... it explains everything. =)

Again, thank you so much.
Sebastian.

On Mon, Oct 19, 2009 at 7:21 PM, Daniel Cassidy <mail at danielcassidy.me.uk>wrote:

> Hi Sebastian,
>
> 2009/10/19 Sebastian Lucas <delsilucas at gmail.com>:
> > I was doing a tool in C with OpenGL to show simple animations on the
> screen.
> >
> > So far I've got some animations working on it.
> > What I do to show them it's to parse the xml generated by swfmill.
> > It's good speed and it works perfect but I've a problem.
> > What does it mean the attributes "replace" and "morph" on the
> PlaceObject2
> > tag?
>
> They mean different things depending on context.
>
> replace="1" means:
>  * If objectId is also set: Replace the object at the specified depth
> with the object referenced by objectId. However, this doesn't work if
> the object to be replaced is a sprite (symbol, i.e. defined with
> DefineSprite*), as opposed to a shape (see below).
>  * If objectID is not set: Change the attributes of the object at the
> specified depth. For example, in the snippet posted above, change the
> transformation matrix of the object at the specified depth.
>
> morph means:
>  * If the object is a morph shape (tween, i.e. defined with
> DefineMorphShape*): how far the morph has progressed, 0=start of the
> morph, 65535=end of the morph.
>  * Otherwise: Used to make looping, gotoAndStop etc. work correctly in
> conjunction with RemoveObject2 (see below).
>
>
> Usually when replacing an object at a particular depth, it is
> sufficient to say <PlaceObject2 replace="1" ...>. However, for some
> reason this doesn't work for sprites, so it is necessary to use
> <RemoveObject2> followed by <PlaceObject2>. However, in this case, the
> Flash Player is no longer able to return to a frame once it has
> entered a subsequent frame, so looping/gotoAndStop etc. don't work.
>
> To fix this, it is necessary to use an incrementing morph attribute on
> each PlaceObject2 tag as follows (transforms omitted for brevity):
>
> <!-- Frame 1: Just place an object. Morph tag is required to make
> looping work. -->
> <PlaceObject2 replace="0" depth="1" objectID="1" morph="0"/>
> <ShowFrame/>
>
> <!-- Frame 2: Remove the previous object. Place replacement with
> incremented morph tag. -->
> <RemoveObject2 depth="1"/>
> <PlaceObject2 replace="0" depth="1" objectID="2" morph="1"/>
>
> <!-- Frame 3: Same again. -->
> <RemoveObject2 depth="1"/>
> <PlaceObject2 replace="0" depth="1" objectID="3" morph="2"/>
>
> <!-- And so on. -->
>
> This weird requirement is imposed by the Flash Player; it disagrees
> with the SWF specification published by Adobe. The official spec says
> that replace="1" (called "PlaceFlagMove" in the spec) should work for
> sprites, and it says nothing of this alternative use of the morph
> attribute (called "ratio" in the official spec).
>
> See also this bug: https://bugs.launchpad.net/swfmill/+bug/409165
>
>
> > ---- example start ----
> > <PlaceObject2 replace="0" depth="1" objectID="4" morph="1">
> >             <transform>
> >               <Transform transX="-4280" transY="-6429"/>
> >             </transform>
> >           </PlaceObject2>
> >           <ShowFrame/>
> >           <RemoveObject2 depth="1"/>
> >           <PlaceObject2 replace="0" depth="1" objectID="10" morph="2">
> >             <transform>
> >               <Transform transX="2" transY="-262"/>
> >             </transform>
> >           </PlaceObject2>
> >           <ShowFrame/>
> >           <PlaceObject2 replace="1" depth="1">
> >             <transform>
> >               <Transform transX="-1" transY="-359"/>
> >             </transform>
> >           </PlaceObject2>
> >           <ShowFrame/>
> >           <PlaceObject2 replace="1" depth="1">
> >             <transform>
> >               <Transform transX="-4" transY="-456"/>
> >             </transform>
> >           </PlaceObject2>
> >           <ShowFrame/>
> > ---- end of example ----
> > This is just a simple tween action of the same MovieClip.
> > I thought that when Flash compiles an swf movie he writes something
> > like "tween from frame 1 to 40 on the object xx, from x,y to x,y" but it
> > seems like me and my pal were completely wrong.
> > For what I understand from that xml the positions of the whole tween are
> > there frame by frame.
>
> I don't think that there are any tweens in the snippet you posted. I
> would hazard a guess that the object with ID 4 is a sprite, so that
> may internally reference some tweened shapes. The other objects are
> replaced with <PlaceObject replace="1">, so they must be plain old
> shapes, without tweens. However, it is also possible and indeed quite
> likely that I am wrong. The SWF format is quite baroque in places and
> there are sure to be constructions that I haven't seen before. It's
> hard to be sure without the rest of the file.
>
>
> > So that's my second question...
> > Is this something related to swfmill or flash?
>
> I'm not sure how to answer this except to refer you to everything I've
> said above :).
>
> Hope this helps,
> Dan.
>
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