GraphicsOverlay remove automatically points

Juance20 — Wed, 24 Feb 2021 09:43:17 GMT

Hi, how are you?

I have one pointcollection with 1742863 points, when add it to GraphicsOverlay:

graphicsOverlay.getGraphics().addAll(pointcollection);

The MapView (with resolution 2614x1469) reflect the drawing, but almost seconds later several points (I ignore amount) are removed and not showing.

This has to do with performance and equipment ? I have one equipment with 16gb ram and intel processor i5-7400.

Re: GraphicsOverlay remove automatically points

MarkBaird — Wed, 24 Feb 2021 10:31:30 GMT

There are 2 rendering modes for graphics overlays. The default is "Dynamic" which gives you a nice user experience when zooming in and out where the symbol size is animated as you change scale. This is however expensive on GPU resources so if you've got almost 2 million graphics you will run out of resources. The other mode is "Static" which I recommend if you have very large numbers of graphics. It doesn't look as nice when you zoom in or out, but it makes better use of our hardware resources.

I've tried this out in a little app I've written just now. In dynamic mode it failed to render all points correctly, but switching to static makes it draw correctly.

private void addLotsOfGraphics() { // static rendering is best for very large number of graphics graphicsOverlay = new GraphicsOverlay(GraphicsOverlay.RenderingMode.STATIC); mapView.getGraphicsOverlays().add(graphicsOverlay); Collection pointsList = new ArrayList<>(); Random random = new Random(); // using a simple marker symbol and applying this to a renderer for graphics overlay SimpleMarkerSymbol simpleMarkerSymbol = new SimpleMarkerSymbol(SimpleMarkerSymbol.Style.CIRCLE, 0xFF00FF00, 10); SimpleRenderer simpleRenderer = new SimpleRenderer(simpleMarkerSymbol); graphicsOverlay.setRenderer(simpleRenderer); // add lots of graphics in random places for (int i=1; i<2000000; i++) { // random point Point point = new Point(random.nextDouble() * 10000000, random.nextDouble() * 10000000); Graphic graphic = new Graphic(point); pointsList.add(graphic); } // add the graphics to the graphics overlay graphicsOverlay.getGraphics().addAll(pointsList); }

Does this help?

Re: GraphicsOverlay remove automatically points

Juance20 — Sat, 27 Feb 2021 17:07:05 GMT

Thanks, works perfectilly. Did not know the rendering modes.

topic Re: GraphicsOverlay remove automatically points in Java Maps SDK Questions

GraphicsOverlay remove automatically points

Re: GraphicsOverlay remove automatically points

Re: GraphicsOverlay remove automatically points