topic Displaying Geodesic Ellipse with Graphics Layer in Qt Maps SDK Questions

Displaying Geodesic Ellipse with Graphics Layer

MichaelGreene2 — Sun, 12 Dec 2021 16:20:27 GMT

I'm trying to write a simple function that draws ellipses at certain device locations as seen in my code below.

void theellipse(const mn:: Point deviceLocation,mn::SceneGraphicsView* m_sceneView,QColor lineColor,mn::GraphicsOverlay* ellipseGraphicOverlay, MapRay *thisF)

    const mn::Point normalizedPt = mn::GeometryEngine::normalizeCentralMeridian(deviceLocation);

    mn::GeodesicEllipseParameters parameters(/*angle*/90,mn::AngularUnit(mn::AngularUnitId::Degrees),normalizedPt,

                   /*unit*/ mn::LinearUnit(mn::LinearUnitId::Kilometers),

                  /*maxpointCount*/10,

                 /*maxSegmentLength*/10000,

                /*geometryType*/mn::GeometryType::Polygon,

               /*SemiAxislength*/120,

              /*SemiAxisLength*/210);

ellipseGraphicOverlay->sceneProperties().setSurfacePlacement(mn::SurfacePlacement::Draped);

m_sceneView->graphicsOverlays()->append(ellipseGraphicOverlay);

mn::PolygonBuilder PolygonBuilder(m_sceneView->spatialReference());

PolygonBuilder.addPoint(deviceLocation);

mn::Polygon ellipse1= mn::GeometryEngine::ellipseGeodesic(parameters);


It's not clear for me through looking at documentation how to turn geodesic ellipse parameters into scene symbols that are graphic layers.  
Any help would be much appreciated. Thanks.

~mike

Re: Displaying Geodesic Ellipse with Graphics Layer

LukeSmallwood — Wed, 19 Apr 2017 13:02:47 GMT

Hi Mike,

You can use the type returned by ellipseGeodesic (in this case a Polygon) as the geometry for a Graphic and then add the graphic to the GraphicsOverlay. To symbolise the graphic in the overlay you can either set a Symbol directly or set a Renderer using a symbol for the entire overlay.

If you take a look at these two samples from our github repository you should see some examples of different approaches to displaying graphics:

- arcgis-runtime-samples-qt/ArcGISRuntimeSDKQt_CppSamples/DisplayInformation/Simple_Renderer at v.next · Esri/arcgis-runti…

- arcgis-runtime-samples-qt/ArcGISRuntimeSDKQt_CppSamples/DisplayInformation/Simple_Marker_Symbol at v.next · Esri/arcgis-…

this sample shows the use of symbols in a scene:

arcgis-runtime-samples-qt/ArcGISRuntimeSDKQt_CppSamples/Scenes/Symbols at v.next · Esri/arcgis-runtime-samples-qt · GitH…

I hope that helps,

Luke

Re: Displaying Geodesic Ellipse with Graphics Layer

MichaelGreene2 — Wed, 19 Apr 2017 16:12:24 GMT

I will look into this.

Thanks Luke,

Mike