topic Re: Saving polygon graphics to shapefile in Qt Maps SDK Questions

Saving polygon graphics to shapefile

FatmaAkdemir — Fri, 02 Sep 2022 08:05:42 GMT

We have a map application where user defines several polygons with mouse. We want to save these polygon Graphics (which are obviously created with PolygonBuilder class) to a shapefile. After the application is restarted by user, we want to reload these polygons on to the map. Are there any coding examples regarding this issue?

Re: Saving polygon graphics to shapefile

GuillaumeBelz — Thu, 08 Sep 2022 17:48:35 GMT

Hello,

You can use ShapefileFeatureTable to load and save shapefile. There is an example in samples here: https://github.com/Esri/arcgis-runtime-samples-qt/tree/main/ArcGISRuntimeSDKQt_CppSamples/Layers/FeatureLayerShapefile. And you can use addFeature to add feature on table https://github.com/Esri/arcgis-runtime-samples-qt/tree/main/ArcGISRuntimeSDKQt_QMLSamples/EditData/AddFeaturesFeatureService

Re: Saving polygon graphics to shapefile

FatmaAkdemir — Fri, 09 Sep 2022 06:18:00 GMT

Hi @GuillaumeBelz , thank you for your answer! I looked at those examples and I think they are a little bit different from what I need actually. What I need is to extract polygons from shapefile as a Geometry and add these geometries to a GraphicsOverlay and vice versa. If I extract the geometries as a Feature, is there a way to convert them to Geometry?

Re: Saving polygon graphics to shapefile

GuillaumeBelz — Tue, 13 Sep 2022 16:21:57 GMT

Hi.

Yes, there are setter and getter for geometry in Feature class: https://developers.arcgis.com/qt/cpp/api-reference/esri-arcgisruntime-feature.html#geometry