Moving the map causes random zoom

[ocobacho]

I have the same problem on ubuntu and android I thinks is related to performance and workload because it tends to happen more on high zoom where more tiles are displayed and also if I have a lot of markers or things going on. When reducing MAX_WORKERS it tends to happen less. So it probably happens in the RPi 3b because of the low resources. Is there a way to optimize this?

Originally posted by @ocobacho in kivy-garden/garden.mapview#69 (comment)

[KhDenys]

@AndreMiras @tshirtman @zworkb @tito Hi. I also have this problem on ubuntu, mac os and android. I tried debug it and found some mistake in on_transform method:

def on_transform(self, *args):
        self._invalid_scale = True
        if self._transform_lock:
            return
        self._transform_lock = True
        # recalculate viewport
        map_source = self.map_source
        zoom = self._zoom
        scatter = self._scatter
        scale = scatter.scale  # here!!!
        if scale >= 2.:
            zoom += 1
            scale /= 2.
        elif scale < 1:
            zoom -= 1
            scale *= 2.
        ...

scatter.scale returns value >= 2 without any tries to change zoom. I think it is a problem in kivy.uix.scatter.Scatter

[michaelu123]

The random zoom goes away if you change the two if statements above to
if (scale - 2.0) > 0.01:
and
elif (scale - 1.0) < -0.01:

[michaelu123]

Or, of course, if scale >2.01, elif scale <0.99

[KhDenys]

@michaelu123 Thanks for info. I'll try it ASAP.

[michaelu123]

Better look at #33 where I make more suggestions. Von: KhDenys [mailto:[email protected]] Gesendet: Mittwoch, 20. Mai 2020 00:22 An: kivy-garden/mapview <[email protected]> Cc: ADFC Michael Uhlenberg <[email protected]>; Mention <[email protected]> Betreff: Re: [kivy-garden/mapview] Moving the map causes random zoom (#22) @michaelu123<https://github.com/michaelu123> Thanks for info. I'll try it ASAP. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub<#22 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AF2755RYJEDTFSF3M5EIYCTRSMBANANCNFSM4MLRCC7A>.