Create a polygon using FeaturesCollection

[Aramis_Garcia]

That would be using bloks not using features collection and geoJson.
By the way, I don´t find Call Map1.AddPolygon block.

[Spicy_Topics]

@Aramis_Garcia

Map1.AddPolygon

I guess it was in other platform

Ok try this

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {
        "Description": "Polígono Irregular en Camagüey",
        "FillColor": "#4488004e",
        "StrokeColor": "#000000",
        "StrokeWidth": 2
      },
      "geometry": {
        "type": "Polygon",
        "coordinates": [
          [
            [-77.90744304656984, 21.393422951386587],
            [-77.90880560874939, 21.395840413279284],
            [-77.91027545928956, 21.398257835208145],
            [-77.91045784950258, 21.401584222359443],
            [-77.90774345397949, 21.4008150644897],
            [-77.90516853332521, 21.400415500362858],
            [-77.90319442749023, 21.400375543890117],
            [-77.90160655975343, 21.40141440863241],
            [-77.89980411529542, 21.40089497718403],
            [-77.89834499359131, 21.39981615212504],
            [-77.89873123168947, 21.397818306921025],
            [-77.90744304656984, 21.393422951386587]
          ]
        ]
      }
    }
  ]
}

[Aramis_Garcia]

No way... still the same error: An internal error has occurred. Report a bug?

Only title and coordinates are acceptable for geojson in app inventor. All other properties returns error.

Thanks

[Aramis_Garcia]

Mmmmm....
Changing properties after creating polygons...

[TIMAI2]

Are you working on Android or iOS ?

For iOS

FeaturesFromGeoJSON are not yet functional

[Aramis_Garcia]

I´m using Android.

But not clear yet on how to use it. I can not achieve the results I want, that is to load all polygon´s properties from FeartureCollection.

Could you, please , provide a functional example of a GeoJson with Title, Coordinates and all possible Properties? I have done many attempts but always failed.

[Aramis_Garcia]

I don´t know what happen. I paste this geojson on FeaturesFromGeoJSON
and works once, showing solid green polygons. I deleted the featureCollection and created again. When paste the same geojson, it creates solid red polygons in companion, not functional at all. No posible to change properties.

[Aramis_Garcia]

This is the result
Is like a red layer over all polygons.
I dragged a polygon in designer and was shown as it should in companion.

[Aramis_Garcia]

Now I loaded a polygons.json file and it´s functional again...
Can someone help me to understand?

[TIMAI2]

First problem, this:

"FillColor": "#4488004e"

what is this meant to be?

[Aramis_Garcia]

I tryed fillcolor and fill for the inner color of polygon
None of those works
#4488004e was the value of one of many atempts

[TIMAI2]

For me, some of the properties just do not seem to be working.

You may have to "translate" (back) some of the properties names, see here:

https://ai2.appinventor.mit.edu/reference/components/maps.html#FeatureCollection

@SteveJG may have a better idea of what is happening.

[SteveJG]

@Aramis_Garcia

-77.90744304656984, 21.393422951386587

The json posted is for a single polygon. It renders green with no problem. I can change it's color easily. His image with the red polygons contains 32 or more polygons. @Aramis_Garcia did not provide the entire json file so I only have the single json to work with.

I suspect his issue when the entire set of Features is loaded and he may not have a robust internet.

When i worked a project that has 258 polygons, it wouldn't load on the main server but did on the code server and took a long time . There may be a similar issue on Aramis' data. Does he load a large file or a bunch of small files to features one at a time.

Aramis', you might post all the json.

Steve

[Aramis_Garcia]

rGeoJson.json (164.2 KB)
This is my full geojson.
I put it iin app inventor as a file and works fine, and put it in app inventor as plain text in FeaturesFromGeoJSON and got the issue I posted before.
But... BUT... It could be I do not have a robust internet. The first time I loaded data as plain text it was successful, but not the second time I did it. I remember first time it took a long time before companion shows app interface.
By the other hand... why the red layer? When I dragged a polygon out off red layer, polygon came to light and works as it is supposed to be.

[Aramis_Garcia]

Result: The same red solid polygons, not useful.

[TIMAI2]

If working with the FeaturesCollection component is just not happening, you could always workaround this by parsing the geojson file and generating runtime polygons, with all your properties, using blocks:

Here is an example - with a couple of random polygons added.
geojson.aia (6.8 KB)

(I included a hexToColour procedure which you will need if setting the FIllColor,StrokeColour etc.)

Blocks

[SteveJG]

I can get this

I'll experiment some more.

[Aramis_Garcia]

@SteveJG

@SteveJG

I'll experiment some more.

Yes, I got the same result, but only when loading the json file, not using plain text in FeaturesFromGeoJSON nor loading from url.

[Aramis_Garcia]

@TIMAI2
That is amazing!!!
Thanks!! Thanks!!
Those blocks recharged my optimism again

@SteveJG
It would be very good if FeaturesCollection works as it is suposed to work.