The only case in which depth would be identical for
two movieclips is if they both were contained in
different parent movieclips.
In that case, check the parent's depth, and use that
to resolve the conflict. If both of those are the
same, continue going up until the conflict is
resolved.
--- Vishal Kapur <[EMAIL PROTECTED]> wrote:
> It looks like you spent some time on this response,
> I really
> appreciate that. As I mentioned in my first mail,
> depth, _visible and
> _alpha are the properties I'm checking right now to
> resolve conflicts.
> So my code looks very similar to your code below.
> This works
> sometimes, but I've run into cases where there are 2
> movieclips for
> which hitTest() is true, _visible is true, _alpha is
> 100, and the
> depths are identical. One of the movieclips is
> obscured behind the
> other; there must be some way to distinguish them.
> Are there any
> other properties on movieclips (maybe hidden ones)
> that might be of
> use? The Flash runtime must be doing this
> internally for onRollOver
> event firing; anyone know how this works?
>
> Thanks,
> Vishal
>
>
>
> On 2/7/07, Karina Steffens <[EMAIL PROTECTED]>
> wrote:
> > Ok, I see your problem, so lets think what else
> you can do with the hitTest
> > approach...
> > First of all, you can set the shape flag to true,
> so that the hit test will
> > only return true if there's something there (as
> opposed to the entire
> > bounding rect).
> > Then you can test for _alpha (you might want to
> test for _visible also),
> > thus eliminating invisible buttons, such as your
> big rectangle that obscures
> > the rest.
> >
> > Finally, checking for different depths - I
> recently discovered that if you
> > loop through a clip, it starts at the highest
> depth, even on the same layer:
> > for (var i in _root) {
> > trace(i + " " +_root[i].getDepth());
> > }
> >
> > $version
> > clip3 -16379
> > clip2 -16381
> > clip1 -16383
> >
> > So now you know which one has the highest depth:
> clip3, which also comes
> > first in the loop.
> > At this point, you can break the loop. If you need
> to go deeper, you can
> > then recurse within that clip, and see if it has
> any child mcs, which one of
> > those scores the highest hitTest and if that one
> has any children - etc.
> >
> > Here's some quick&dirty code:
> >
> > for (var i in _root) {
> > trace(i + " " +_root[i].getDepth());
> > }
> >
> > _root.onEnterFrame = function() {
> > for (var i in this) {
> > var clip = this[i];
> > if (!(clip instanceof MovieClip))
> {
> > continue;
> > }
> > if (clip._alpha == 0 ||
> clip._visible == 0) {
> > continue;
> > }
> > if (clip.hitTest(_root._xmouse,
> _root._ymouse, true)) {
> > trace(clip);
> > break;
> > }
> > }
> > };
> >
> > On the timeline, I placed three circular clips
> overlapping eachother, so
> > that clip1 is at the lowest depth and clip3 at the
> highest. I made clip3
> > invisible by setting it's alpha to 0.
> >
> > After moving my mouse over the clips, starting
> from the third, the trace
> > result was:
> >
> > $version
> > clip3 -16379
> > clip2 -16381
> > clip1 -16383
> > _level0.clip2
> > _level0.clip2
> > _level0.clip2
> > _level0.clip2
> > _level0.clip2
> > _level0.clip2
> > _level0.clip2
> > _level0.clip1
> > _level0.clip1
> > _level0.clip1
> >
> > Each time the trace picked out the highest visible
> part of a clip, thus
> > resolving any conflicts.
> >
> > Hope this helps to point you in the right
> direction.
> > Karina
> >
> >
> > > -----Original Message-----
> > > From: Vishal Kapur [mailto:[EMAIL PROTECTED]
> > > Sent: 07 February 2007 20:29
> > > To: Flashcoders mailing list
> > > Subject: Re: [Flashcoders] determining which
> object is
> > > displayed at agivenpoint
> > >
> > > To respond to the recent activity on this
> thread:
> > > Erik, the core functionality that I need really
> does need to
> > > be comprehensive and fairly generic: so, given
> any 3rd party
> > > swf which I don't have a priori knowledge of,
> determine which
> > > object is currently underneath the mouse. It
> needs to work
> > > for any movieclip or TextField object. It's
> proprietary so I
> > > can't really disclose why I need it.
> > > You mention that implementing this would be
> process
> > > intensive: this is ok to start. The way I would
> like to
> > > tackle this problem is to get it working
> functionally, and
> > > worry about performance later.
> > >
> > > Karina, Jason, the approaches you are suggesting
> of looping
> > > through all the movieclips and calling hitTest()
> on each one
> > > is exactly what my first approach was (see my
> first email in
> > > this thread). The problem is that very often
> multiple
> > > movieclips will return hitTest()==true for a
> given mouse
> > > position (clips at different depths, clips
> obscuring others,
> > > etc). That's what I meant by "2 conflicting
> objects" in my
> > > first mail. I'm trying to find an algorithm to
> resolve conflicts.
> > >
> > > There is another approach which Erik mentioned,
> which is to
> > > define/override the onRollOver callback for
> every object that
> > > I care about, and set some variable that keeps
> track of the
> > > last object that invoked onRollOver. I have
> tried this
> > > before, and I ditched it because I couldn't find
> a way to get
> > > TextField objects to invoke an onRollOver
> callback (or to
> > > otherwise respond to a 'roll over' event).
> > > Any ideas on this?
> > >
> > > Thanks,
> > > Vishal
> > >
> > >
> > >
> > > On 2/7/07, Jason Boyd <[EMAIL PROTECTED]> wrote:
> > > > I've been following this thread and am just
> curious --
> > > everyone seems
> > > > to be assuming that looping through all clips
> and doing
> > > hitTest() is
> > > > inefficient, but presumably this is exactly
> what the Flash
> > > player is
>
=== message truncated ===
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