topic Add Shapefile widget in Web AppBuilder Custom Widgets Questions

Add Shapefile widget

DiegoLlamas — Wed, 20 Jan 2016 15:33:11 GMT

Hi,

I am using the "add Shapefile Widget" that someone here helped to create. Now that I am using it and checking the behavior I notice that the polygons that compose the shapefile, after adding it to WAB app the polygons do not respect the original forms, they have a distotion very significant.

First I thought it was because AGOL use Web Mercator Coordinates system. Here in Puerto Rico we use Nad83 Projected Coordinate system So I added on parcel example in Nad83 and I notice the distortion, after that I added the same chunk of parcels projected to Web Mercator and I had the exact same distortion in the same parcels.

My question is, Do you know why could it be happening? dos anybody knows is someone notice the same behavior? is there a new version of this widget for WAB 1.3? how could i solve this problem? this problem also happend in WAB 1.2

Thanks,

Diego Llamas

Re: Add Shapefile widget

MonikaHonkova2 — Fri, 29 Jan 2016 15:46:45 GMT

Hi Diego,

have you looked into the code widget.js? It generalizes features on the fly:

//generalize features for display Here we generalize at 1:40,000 which is approx 10 meters

//This should work well when using web mercator.

var extent = scaleUtils.getExtentForScale(widgetMap, 40000);

var resolution = extent.getWidth() / widgetMap.width;

params.generalize = true;

params.maxAllowableOffset = resolution;

params.reducePrecision = true;

params.numberOfDigitsAfterDecimal = 0;

Personally, I don't want the shapes to be generalized (e.g. a round circle is after generalization not that round anymore as vertices are removed) , so I commented out these few lines of code...

Monika

Re: Add Shapefile widget

DiegoLlamas — Fri, 29 Jan 2016 18:09:55 GMT

Monika,

Thank you for your help!