topic Line with an arrow head in Java Maps SDK Questions

Line with an arrow head

VanyaIvanov — Thu, 11 Nov 2021 07:14:35 GMT

I want to draw a line with an arrow on the end.

            PointCollection polylinePoints = new PointCollection(SpatialReferences.getWgs84());
            polylinePoints.add(new Point(10, 10));
            polylinePoints.add(new Point(20, 20));

            Polyline polyline = new Polyline(polylinePoints);

                    SimpleLineSymbol lineSymbol = new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID,
                    0xFF0063FF, 7, SimpleLineSymbol.MarkerStyle.ARROW, SimpleLineSymbol.MarkerPlacement.END);
 
            Graphic polylineGraphic = new Graphic(polyline, lineSymbol);
           
            //as i read the sceneView should be in Static rendering mode for using  SimpleLineSymbol.MarkerStyle.ARROW
            sceneView.getArcGISScene().getLoadSettings().setPreferredPolylineFeatureRenderingMode(FeatureLayer.RenderingMode.STATIC);
            sceneView.getArcGISScene().getLoadSettings().setPreferredPointFeatureRenderingMode(FeatureLayer.RenderingMode.STATIC);
            sceneView.getArcGISScene().getLoadSettings().setPreferredPolygonFeatureRenderingMode(FeatureLayer.RenderingMode.STATIC);

            graphicsOverlay.getGraphics().add(polylineGraphic);

But it doen't work. Line is drawn but without arrow on its head

How to draw a line with an arrow on the Scene using arcgis runtime api for Java?

Re: Line with an arrow head

MarkBaird — Thu, 11 Nov 2021 10:49:45 GMT

I can see the problem here, the rendering mode for a GraphicsOverlay is set when you instantiate it. The default constructor will set it in DYNAMIC, but there is an overload which allows you to set this yourself.

The code you've written for changing the rendering mode is for feature layers.

Using the following code, I've managed to render your arrowhead:

PointCollection polylinePoints = new PointCollection(SpatialReferences.getWgs84()); polylinePoints.add(new Point(10, 10)); polylinePoints.add(new Point(20, 20)); Polyline polyline = new Polyline(polylinePoints); SimpleLineSymbol lineSymbol = new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, 0xFF0063FF, 7, SimpleLineSymbol.MarkerStyle.ARROW, SimpleLineSymbol.MarkerPlacement.END); Graphic polylineGraphic = new Graphic(polyline, lineSymbol); GraphicsOverlay graphicsOverlay = new GraphicsOverlay(GraphicsOverlay.RenderingMode.STATIC); sceneView.getGraphicsOverlays().add(graphicsOverlay); graphicsOverlay.getGraphics().add(polylineGraphic);

I am however going to look at making the arrow head to render in the dynamic rendering mode for a future release.

Does this help?

Re: Line with an arrow head

VanyaIvanov — Thu, 11 Nov 2021 11:38:59 GMT

Thank you Mark! it works!