Latest Contributions by MarkBaird

Hi JC, So to make  your app more usable you have some options to build upon the scale thresholds you've set up. Probably the easiest improvement is to seek some data which works at a more zoomed out scale.  Is there some vector data you have access too which would provide you with an outline of country boundaries for example?  This could give your application some better spatial context whilst you are zoomed out.  A basemap would also potentially give you the same. If the RPF data is the only thing you have, then building pyramids on the data will make it perform better when you are zoomed out.  Basically building pyramids on a raster dataset gives you lower resolution versions of the data which are displayed as you zoom out.  This reduces the amount of data we need to display and hence it will perform much faster.  Building Pyramids is something you can do in ArcGIS Pro or ArcMap.  Once you've got pyramids built, you will be able to view the data in a much wider range of scales without it working your app very hard to display the data. Here is some background information to explain what pyramids are about: https://pro.arcgis.com/en/pro-app/latest/help/data/imagery/raster-pyramids.htm The other thing you ask is what is a map scale?  In your code you've set the min scale to 1001.  This means you've set the scale to 1:1001.  It's never completely accurate on a monitor, but this basically means that something measure 1 metre on the screen represents something which in reality is 1001 metres.   ... View more

@MarylynAlaso I can see you have posted this question in the ArcGIS Runtime for Java area so I'm assuming you are writing a JavaFX application. When you are working with any types of features regardless on if it comes from OGC data, feature layers, or in your case shapefiles, you can perform a programatic "identify" operation.  This basically allows you to get geometry and attribute information from the item you have just clicked on. I've not used your specific data, but I've built upon an existing samples we have in git: https://github.com/Esri/arcgis-runtime-samples-java/tree/master/feature_layers/feature-layer-shapefile I've added some extra code to listen into mouse click events and use that point to perform an identify operation.  In its current form, the code just outputs text to the console, but it should help you to develop the next stage of your application. // add the feature layer to the map map.getOperationalLayers().add(featureLayer); // listen into clicks and identify results mapView.setOnMouseClicked(event -> { System.out.println("clicked"); Point2D clickedPoint = new Point2D(event.getX(), event.getY()); // listenable future for waiting for results from identify on layer ListenableFuture<IdentifyLayerResult> resultFuture = mapView.identifyLayerAsync(featureLayer,clickedPoint,10,false); resultFuture.addDoneListener(() -> { System.out.println("got result"); try { // get the results from the future IdentifyLayerResult result = resultFuture.get(); // loop through each element (probably only 1) and get the attributes for (GeoElement element : result.getElements()) { Map<String, Object> attributes = element.getAttributes(); System.out.println("attributes " + attributes); } } catch (InterruptedException e) { e.printStackTrace(); } catch (ExecutionException e) { e.printStackTrace(); } }); });  Does this help? ... View more

There is no API for moving a polygon as they are immutable.  You have to create a new one which is the workflow I was showing in my code example.  Remember that Graphics can be updated with a new geometry, which is how you create an updating graphics view of your world.     So if each ship you are tracking has a different radius, you need to store this somewhere.  Although in my example I've shown a graphic consisting of a geometry and a symbol, they can also have attributes which could be used to store your extra information. You could look into using the moveGeodesic methods to help you constrict a new geometry from an existing set of points from an old geometry GeometryEngine (ArcGIS Runtime SDK for Java 100.9.0) , but its probably easer to call your ellipseGeodesic method again. ... View more