Re: How to do animations in 1.16

[Alessandro Re <ale ale-re net>]

Hello,

On Wed, Oct 16, 2013 at 12:39 AM, Emmanuele Bassi <ebassi gmail com> wrote:
> the only thing that should be noted is that
> Clutter.Transition.set_animatable() should never be used directly with
> actors: you should use Clutter.Actor.add_transition(), which handles a
> lot of the internal state, like signal emissions and automatic
> collection of stopped/completed transitions, and allows you to access
> transitions from the actor instead of keeping the instance around.
> Clutter.Transition.set_animatable() is just a bit of implementation
> that I had to let escape, in order to allow external implementations
> for non-actor types.

Roger! If you don't mind, I'll add this note to the tutorial :)

> On 15 October 2013 23:32, Bastian Winkler <buz netbuz org> wrote:

> > Apart from the deprecated methods (Actor.animate(), Animator, State) you
> > have two different APIs for animations, implicit and explicit.
> > Both ways are documented here:
> > https://developer.gnome.org/clutter/stable/ClutterActor.html#ClutterActor-animation

Uh, thanks for this. I thought (for some obscure reason) that implicit
animation was indissolubly related to ClutterAnimation and with its
deprecation the implicit method was also deprecated. Good to know it
is not!

> > True again, ClutterTransition is an abstract class. This should be
> > really mentioned in the docs. Would you mind to open a bug report?

I don't mind. Bug 710232 opened.

> > You have to prefix names of the virtual methods with 'do_'. PyGObject
> > restriction...

Oh, thanks. (I really have to take a look at GObject)

> > Well, the :position property uses ClutterPoint, but you're setting
> > integer values... :)

Ouch :( sorry. Anyway, no error is printed about this (is it ok?)
Using the following it works:

    start_pt = clu.Point()
    end_pt = clu.Point()
    start_pt.x, start_pt.y = 0, 0
    end_pt.x, end_pt.y = 100, 100
    transition.set_from(start_pt)
    transition.set_to(end_pt)

but the code is a bit verbose... Is there a method to create directly
a point with given x and y?
In general, I'm still not sure about how Clutter structures should/can
be created and initialized in python... I remember I found something
on the doc about this topic, but I found it inconsistent with code
experiments, so I just started trying.

> > > I do not know where to go from here.
> > > Can someone please help me?
> >
> > from gi.repository import Clutter
> > ...
> > Clutter.main()

This is going to help a lot! Many thanks!

> > PS: I don't want to sound rude, but would you mind to use 'Clutter'
> > instead of 'clu' in your tutorial? The former is the usual way for
> > PyGObject projects, so it would be 'easier' to read for people that are
> > used to it :)

Of course I don't mind; already modified (with search and replace,
hope it's fine).

Thanks again
~Ale