How to make a symbol render with real world units?

Question

Hello, I have a new task and I'm not sure if this is possible with the Pro SDK. My goal is to create a PointSymbol either from a picture or a character marker which represents a real world object of known size and to make the symbol show the object in natural size in scale range from 1:1 to 1:100. In theory, if I look at the API, it should be enouth to set: symbol.UseRealWorldSymbolSizes = true; symbol.SetSize(23.75); If map is set to meters, it should render the symbol with 23.75 m (map units) but when I zoom out, I would now expect the icon to stay at 23.75m and therefore to shrink appropriately. But it still holds its size at any zoom level. This is my complete snippet: CIMCharacterMarker marker = SymbolFactory.Instance.ConstructMarker( 66, "Schiff_real", "Regular", _config.ShipIconSize, ColorFactory.Instance.BlackRGB) as CIMCharacterMarker; var symbol = SymbolFactory.Instance.ConstructPointSymbol(marker); symbol.UseRealWorldSymbolSizes = true; symbol.SetSize(23.75); return symbol;‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ Can someone please help me?

RichardReinicke · Answer

Hello Uma,

okay no problem. It's good to know that it doesn't depend on my code. When I think about it closer, the behaviour is also clear to me. The MapOverlay seems to be nothing more than that a map overlay so however it is created, it will be placed like that above the map and will not change. A FeatureLayer however is part of the map itself and therefore reacts and changes with the map renderer.

For now, I will try a InMemory FeatureLayer with a single Feature in it. The problem is that our feature gets update quite often so it probably takes much resources to edit a data source instead of adding a 'simple' overlay.

Thank you once again for checking this!

UmaHarano · Answer

Hi Richard

Thank you for the clear explanation on what you are trying to accomplish. I was able to see the issue once I changed my code to use Map overlays.  Look like Overlay graphics don't resize with the map reference scale.

I will update this post once I have some information as to when this will be implemented.

Thanks

Uma

RichardReinicke · Answer

Hello Uma, thank you for your code! I'm glad to see that symbols react to reference scale but for some reason it doesn't do in my case: Can you please have a look if you see some problem with my code? I first create a single SymbolReference on add-in start: _gpsPositionSymbol = await CreateGpsPositionSymbolReference().ContinueWith(result => result.Result); private Task<CIMSymbolReference> CreateGpsPositionSymbolReference() { return QueuedTask.Run(() => { CIMCharacterMarker marker = SymbolFactory.Instance.ConstructMarker( 66, "Schiff_real", "Regular", _config.ShipIconSize, ColorFactory.Instance.BlackRGB) as CIMCharacterMarker; var symbol = SymbolFactory.Instance.ConstructPointSymbol(marker); symbol.SetRealWorldUnits(true); symbol.SetSize(23.75); // Kormoran ship size in real units? return symbol.MakeSymbolReference(); }); }‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ Also I react on MapView initialized event and set the reference scale once: // Do not wonder I have a custom class that listens to Map and MapView events and // provides some more specific events private async void MapViewInitialized(MapViewEventArgs eventArgs) { // Do something in main app when map view is loaded await QueuedTask.Run(() => { MapView.Active.Map.SetReferenceScale(4000); }); }‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ Later in my code I have a MapOverlay with a single point which is regularly updated per second. I set the symbol rotation to a specific angle: ((CIMPointSymbol)_gpsPositionSymbol.Symbol).SetAngle(targetCourseAngle);‍‍ Then I create or update my overlay: if (_gpsPositionOverlay == null) { _gpsPositionOverlay = MapView.Active.AddOverlay(mapPoint, _gpsPositionSymbol); } else { MapView.Active.UpdateOverlay(_gpsPositionOverlay, mapPoint, _gpsPositionSymbol); }‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ My symbol still holds size after each zoom. BBicking1_0-1727723937167.png