Using a HeatMap renderer on a GraphicsLayer

TomSellsted — Sun, 12 Dec 2021 07:37:49 GMT

Greetings,

I have created an app that we use for public safety public disclosure requests. The app uses a geoprocessing script that queries a database (not geodatabase) that returns rows that have lat/lon coordinates. Points are then created with the attributes and added to a GraphicsLayer and drawing the layer with a SimpleRenderer to begin with. I have added a couple of buttons that allow the user to change how the points are displayed. This displays fine with a SimpleRenderer or UniqueValueRenderer, but won't work with a HeatmapRenderer. There are no errors in the console, just a blank map.

I have read the documentation and there isn't anything that says a HeatmapRenderer won't work with GraphicsLayer. I have seen some similar posts that don't actually answer this question. The code for this seems pretty straightforward. Here are some snippets for changing the renderers:

function displayBasicPoints() {

     var marker = new SimpleMarkerSymbol();
     marker.setColor(new Color([168, 0, 0, 0.25]));

     var resultsRenderer = new SimpleRenderer(marker);
     resultsLayer.setRenderer(resultsRenderer);
     resultsLayer.refresh();

}

function displayHeatmap() {
     resultsLayer.spatialReference = map.spatialReference;
     var hr = new HeatmapRenderer();
     resultsLayer.setRenderer(hr);
     
     resultsLayer.refresh();
     
}‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

You can also view the app at: DEX Queries

Thanks very much for any help!

Regards,

Tom

Re: Using a HeatMap renderer on a GraphicsLayer

TomSellsted — Wed, 19 Apr 2017 18:36:41 GMT

Greetings,

I ended up contacting support to see why this wasn't possible. The answer was that this was by design. The renderer for a heatmap requires a schema for possible weighting fields and uses the geometry type as set in a featurelayer. Support was also adding a documentation enhancement that would better describe that the renderer should be used with a featurelayer.

I did find that you can use a unique value renderer with a graphicslayer, so this does seem a bit inconsistent. It would be nice to render a heatmap in a graphicslayer just based on the geometry and without the ability to use a weight field.

I am going to work on moving my table data into a feature collection that can be used with a featurelayer so it can render a heatmap. Support pointed me to an example that will be helpful. Feature collection | ArcGIS API for JavaScript 3.20

Regards,

Tom

topic Using a HeatMap renderer on a GraphicsLayer in ArcGIS JavaScript Maps SDK Questions

Using a HeatMap renderer on a GraphicsLayer

Re: Using a HeatMap renderer on a GraphicsLayer