topic Re: Renderer polygon rings as points in ArcGIS JavaScript Maps SDK Questions

Renderer polygon rings as points

MariusPikzirnis — Mon, 25 Jul 2022 11:58:32 GMT

Hello,

I have polygons with multiple rings. At some zoom level I am rendering polygons to points, but only one point is rendered to multi polygons.

Is it possible to render points for each ring?

Re: Renderer polygon rings as points

ReneRubalcava — Mon, 25 Jul 2022 15:14:53 GMT

Do you want to render the vertices of the polygon to points? Or the center of the polygons to points?

You would need to break the polygon into polylines and the polylines into points. I have a utility you can use for that.
https://github.com/odoe/explode/

For the render to polygon to points, you can define the renderer to display points and it will use the centroid of the polygon.

https://developers.arcgis.com/javascript/latest/api-reference/esri-renderers-SimpleRenderer.html

The center can be a little off if it's an oddly shaped polygon, like a horse shoe or something.

Re: Renderer polygon rings as points

MariusPikzirnis — Tue, 26 Jul 2022 05:06:56 GMT

I have objects with multiple drawn polygons to them. I am using a feature service. These polygons are all around the city.

If I change the renderer to simple-marker it only renders one polygon to point and that's it.

Re: Renderer polygon rings as points

ReneRubalcava — Tue, 26 Jul 2022 14:39:31 GMT

That's expected. So you want to show the vertices of the polygon as points? You'll need to break it down to points using something like the explode utility I linked above. Polygons -> Polylines -> Points