On Fri, Mar 25, 2011 at 05:09, ekspiulo <[email protected]> wrote:
> I think I'm 80% of the way toward understanding how this should work, but my
> test case never calls apply_transform, so I don't know what exactly it does.
> When exactly is this function called, and am I handling it right here? My
> print(...) statement never prints, so I don't think its even being called.
> What am I doing wrong here?
This works here, but you need to prepend do_ to the name of your vfunc override:
def do_apply_transform(self, matrix):
print("applying")
Clutter.Actor.do_apply_transform(self, matrix)
matrix.translate(5.0, 10.0, 0.0)
> I'm using Clutter through Python with GObject introspection.
Make sure you are using recent versions of those (latest stable
releases should be enough).
Regards,
Tomeu
> Thanks,
>
> Brian
>
> from gi.repository import Clutter
> from gi.repository import Cogl
>
> class GridView(Clutter.Rectangle):
> """A 2D plane of rectangular items."""
>
> def __init__(self, width=100, height=100):
> Clutter.Rectangle.__init__(self)
> self.set_size(width, height)
> self.set_color(Clutter.Color.new(64, 64, 64, 255))
>
>
> def apply_transform(self):
> print("applying")
> Clutter.Actor.apply_transform(self, matrix)
> matrix.translate(5.0, 10.0, 0.0)
>
> if __name__ == "__main__":
> Clutter.init([])
> stage = Clutter.Stage()
> stage.set_size(600,600)
> grid = GridView()
> grid.set_position(0,0)
> stage.add_actor(grid)
> stage.connect('destroy', lambda *x: Clutter.main_quit())
> stage.show_all()
> Clutter.main()
>
> On 03/24/2011 08:19 AM, Emmanuele Bassi wrote:
>>
>> On 2011-03-23 at 13:47, ekspiulo wrote:
>>>
>>> Hello all,
>>>
>>> I'm planning to write a GTK application containing a big google maps
>>> style pan& zoom view of a finite and reasonably sized clutter
>>> stage, and all of the tutorials and such seem to recommend using
>>> GtkClutterViewport, which makes sense given that a GtkViewport is
>>> the standard method of viewing something larger than space in the
>>> UI; however, it looks like this was recently removed. . .
>>>
>>> Is there new pattern for constructing such a veiwport in a gtk&
>>> clutter application?
>>
>> the GtkClutterViewport actor was removed because it was not as useful or
>> as flexible as it looked like.
>>
>> you can easily implement the same functionality in a custom Actor
>> sub-class overriding the apply_transform() virtual function, and calling
>> cogl_matrix_translate() on the passed transformation matrix; the offsets
>> can come from a MxAdjustment, a GtkAdjustment or two properties bound to
>> any model.
>>
>> ciao,
>> Emmanuele.
>>
>
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