Not all tiles are loading if i use Zoom Levels like 14.7 #605

eazy2x · 2020-04-27T22:42:56Z

1st, forgive me if the problem is on my side, still new in programming/flutter.

I am trying to build a Map view, which whereever you are (Latitude - north/south) always displays the same distance (in meter) on the screen, with fixed zoom Level. Seeing that Zoom Level ist a double, i thought, cool no big deal, but now if i set it to 14.7 as an example this happens:

The tiles at the corners wont load until you move a bit closer to them in the map view, any way to trigger them loading a bit earlier or maybe fix that (if thats really an "issue")?

Oh and i use Mapbox, 'mapbox.dark', dont mind the Hexagons on top of the map they are markers.

johnpryan · 2020-04-27T22:51:08Z

This looks like a bug to me, do you have a lat/long and and size to reproduce the issue?

ibrierley · 2020-04-28T06:16:35Z

Reminds me a bit of this bug #525 but I think the latest version superceded, but that code is still in there if someone else is using it.

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On Mon, Apr 27, 2020 at 11:51 PM John Ryan ***@***.***> wrote: This looks like a bug to me, do you have a lat/long and and size to reproduce the issue? — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#605 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AA5YN5LNOSFWGVBG4BGKRB3ROYD6VANCNFSM4MSKH6AA> .

eazy2x · 2020-04-28T07:30:33Z

This happens anywhere, anytime (if you havent cached the map arround) but just with 14.7 zoom set (zoom, maxzoom and minzoom) i noticed it. Some decimals like 15.2 work fine, seems only the last bit until you reach the next Level? This example anyway is at LatLng(64.137125, -21.902071); (iceland)

Might also be different depending on phone screen size/ratio? I am using Nexus 6 api 28 for the emulator.

ibrierley · 2020-04-28T07:34:06Z

I have a pull request in that link above, it's only one tiny change in a file you could temp try and then restore to original. It would be interesting to see if you can try it and see if it helps at all. Ian

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On Tue, Apr 28, 2020 at 8:30 AM eazy2x ***@***.***> wrote: This happens anywhere, anytime (if you havent cached the map arround) but just with 14.7 zoom set (zoom, maxzoom and minzoom) i noticed it. Some decimals like 15.2 work fine, seems only the last bit until you reach the next Level? This example anyway is at LatLng(64.137125, -21.902071); (island) Might also be different depending on phone screen size/ratio? I am using Nexus 6 api 28 for the emulator. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#605 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AA5YN5O6OHGWWZLMRL5LEYTRO2A2RANCNFSM4MSKH6AA> .

eazy2x · 2020-04-28T07:45:47Z

sorry accidently closed

eazy2x · 2020-04-28T08:09:52Z

i tested 0.8.2 now (changed yaml file/pub get) which should revert that (and other stuff) but same issue, using 14.7 zoom wont load tiles if they are at the edges of the screen.

ibrierley · 2020-04-28T08:24:56Z

any way for you to have a minimal example that breaks it that people could try ?

eazy2x · 2020-04-28T08:31:45Z

Basicly used the "on_tap" page in examples, using that and set all zoom levels to 14.7 should do the trick. And i removed AppBar, even hide status bar, not sure if that has an effect (but even sides left/rigth wont load if it's just a bit in the screen)

ibrierley · 2020-04-28T08:38:47Z

Have you tried 0.9.0 ?

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On Tue, Apr 28, 2020 at 9:32 AM eazy2x ***@***.***> wrote: Basicly used the "on_tap" page in examples, using that and set all zoom levels to 14.7 should do the trick. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#605 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AA5YN5I4MHQHIUKREIKBRNLRO2IABANCNFSM4MSKH6AA> .

eazy2x · 2020-04-28T08:41:44Z

did some testings:

it is worst at 14.5 getting better slowly until 15 is fine. Then 15.0 - 15.49 has no problem at all (same as 14.0 - 14.49 has no issue)

so just the .5 to .99 range is causing the problem

eazy2x · 2020-04-28T08:44:33Z

Have you tried 0.9.0 ?
…

sure, before i used "any" so should have been, going back to 0.8.2 was my quick way to test the package before your pull (checked dates) as i have no clue how to change it manually.

ibrierley · 2020-04-28T08:48:35Z

Works fine for me at that zoom level 14.7, but may be you need to be more specific with the code changes (latlngs and if it's just the flutter_map zoom to 14.7 or whatever) to replicate.

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On Tue, Apr 28, 2020 at 9:44 AM eazy2x ***@***.***> wrote: Have you tried 0.9.0 ? … <#m_-5830518606377145422_> sure, before i used "any" so should have been, going back to 0.8.2 was my quick way to test the package before your pull (checked dates) as i have no clue how to change it manually. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#605 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AA5YN5KTE5SG2T6CAAUKK5LRO2JP7ANCNFSM4MSKH6AA> .

eazy2x · 2020-04-28T08:51:16Z

oh and i think it depends on the latitude you are on, swapped to Singapore (near 0) and at 14.5 i have barely an issue (just a tiny bit), so issue seems to come with the stretch factor of the map, going nort/south

the very problem i am working on right now (to show fixed size window with same meters)
working formulas i foud here:
https://gis.stackexchange.com/questions/110730/mercator-scale-factor-is-changed-along-the-meridians-as-a-function-of-latitude

eazy2x · 2020-04-28T08:56:40Z

Really just use the on_tap just added my hexagon "markers" as i have to learn it by starting with something that works.

My quick test start points: (and as said using mapbox.dark)

// static LatLng startPoint = LatLng(71.167802, 25.782208); //Nordkap
// static LatLng startPoint = LatLng(64.137125, -21.902071); // Island
// static LatLng startPoint = LatLng(34.031037, -5.002876); // Marokko
static LatLng startPoint = LatLng( 1.329646, 103.840275); // Singapur

center: startPoint,
zoom: fixedZoom,
maxZoom: fixedZoom,
minZoom: fixedZoom,

and fixed zoom i just set by hand to test some samples, now i want to compute it, using the formulas in that stack link and break it down to mapzoom using log2

so at Singapore, barely an issue, but up north and biggest problem at .5 levels, no issue at .0-.49

eazy2x · 2020-04-28T09:06:39Z

to compare: singapore at 14.5 lvl (thats the worst i can get it to by slowly moving map)

vs cape north, again worst case by slowly moving map

eazy2x · 2020-04-28T09:10:47Z

from math aspect, i guess the error is no counting in the stretch of the map projection, to dig/dive into the code of package i am not able at this point, even struggle to understand basic stuff, but hope my observations may help you guys, probably not many testing uneven zoom levels up north lol

ibrierley · 2020-04-28T10:07:52Z

As mentioned, I can't replicate the problem, but maybe someone else can spot it. But it would be useful to have a specific example people can add to check to see if they get the same problem. Ian

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On Tue, Apr 28, 2020 at 10:11 AM eazy2x ***@***.***> wrote: from math aspect, i guess the error is no counting in the stretch of the map projection, to dig/dive into the code of package i am not able at this point, even struggle to understand basic stuff, but hope my observations my help you guys, probably not many testing uneven zoom levels up north lol — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#605 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AA5YN5OKPO4ZZERZ6HNVFFDRO2MSNANCNFSM4MSKH6AA> .

eazy2x · 2020-04-28T10:25:28Z

i will try to put an example together, tried OSM now as provider, tiles are smaller compared to mapbox, issue still there but not that obvious as the width of possible missing tiles area is cut by / 2

eazy2x · 2020-04-28T11:20:00Z

Now i am confused, trying to rebuild, all works fine, removed paddings, column/flex/deleted app bar, also hide status bar, all works in this sample app as usual.

Last difference i can spot: i also did remove that "drawer: ..." as i only use 1 screen (but i dont really know what this is doing) could it be the issue? sorry for wasting your time :/

could send you my //spaghetti// code i am not to proud of

maRci002 · 2020-04-28T16:00:36Z

Unreproducible, tested with this code:

class OnTapPage extends StatelessWidget {
  static const String route = 'on_tap';

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      // appBar: AppBar(title: Text('OnTap')),
      drawer: buildDrawer(context, OnTapPage.route),
      body: FlutterMap(
        options: MapOptions(
          center: LatLng(51.5, -0.09),
          zoom: 14.7,
          maxZoom: 15.0,
          minZoom: 3.0,
          onTap: print,
        ),
        layers: [
          TileLayerOptions(
            urlTemplate: 'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
            subdomains: ['a', 'b', 'c'],
          ),
        ],
      ),
    );
  }
}

github-actions · 2021-03-28T02:23:58Z

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 5 days.

github-actions · 2021-04-02T02:34:43Z

This issue was closed because it has been stalled for 5 days with no activity.

eazy2x closed this as completed Apr 28, 2020

eazy2x reopened this Apr 28, 2020

github-actions bot added the Stale label Mar 28, 2021

github-actions bot closed this as completed Apr 2, 2021

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Not all tiles are loading if i use Zoom Levels like 14.7 #605

Not all tiles are loading if i use Zoom Levels like 14.7 #605

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Not all tiles are loading if i use Zoom Levels like 14.7 #605

Not all tiles are loading if i use Zoom Levels like 14.7 #605

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