topic Re: Moving and Rotating Multiple Polygons in ArcGIS API for Silverlight Questions

Moving and Rotating Multiple Polygons

JeremyBanner — Tue, 06 Dec 2011 17:43:10 GMT

I'm working with a layer of building sketches (polygons) that are composed of several different polygons each. I want the user to be able to select all the polygons for a building at once and then rotate and move all the parts together. It appears that the built in tools will only move and rotate one polygon at a time. I have been working with the editgeometry and editor classes and I can select several polygons together and move them by iterating through all the points in all the rings and moving them with mouse move events. My problem is that I can't get the edits to save either by calling SaveEdits on the editgeometry or editor.Save.Execute on the editor. Any ideas?

Re: Moving and Rotating Multiple Polygons

JenniferNery — Wed, 14 Dec 2011 18:50:25 GMT

If you are using Editor.EditVertices, I don't see a reason why edits are not saved since geometries are first simplified before it overwrites your geometry. If you are using EditGeometry, you may need to simplify the geometry first: http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#Simplify. Kindly check Fiddler when saving this edit, SpatialReference on Geometry might be missing. If so, we have logged this bug in EditGeometry.

Re: Moving and Rotating Multiple Polygons

JeremyBanner — Sun, 12 Dec 2021 01:12:22 GMT

If you are using Editor.EditVertices, I don't see a reason why edits are not saved since geometries are first simplified before it overwrites your geometry. If you are using EditGeometry, you may need to simplify the geometry first: http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#Simplify. Kindly check Fiddler when saving this edit, SpatialReference on Geometry might be missing. If so, we have logged this bug in EditGeometry.

Jennifer,
Thank you for your reply. I was trying to edit each selected Graphic.Geometry object directly and change it's vertices. But when I tried to save the changes were lost. What did work was making a clone of the geometry, editing the vertices, and then assigning the clone back to the Graphic.Geometry object. Now I can move and rotate groups of polygons together. Here's the code I used to move polygons.

 
            foreach (var graphic in flayer.SelectedGraphics)
            {
                _edit_Geometry.StartEdit(graphic);
                ESRI.ArcGIS.Client.Geometry.Geometry geom = 
                    ESRI.ArcGIS.Client.Geometry.Geometry.Clone(graphic.Geometry);
                ESRI.ArcGIS.Client.Geometry.Polygon polygon = geom as ESRI.ArcGIS.Client.Geometry.Polygon;
                if (polygon != null)
                {
                    foreach (var ring in polygon.Rings)
                    {
                        IEnumerator<MapPoint> points = ring.GetEnumerator();
                        while (points.MoveNext())
                        {
                            points.Current.X = points.Current.X + changeinX;
                            points.Current.Y = points.Current.Y + changeinY;
                        }
                    }
                }
                graphic.Geometry = geom;
                _edit_Geometry.StopEdit();
                
            }

Re: Moving and Rotating Multiple Polygons

BrettBattles1 — Sun, 12 Dec 2021 01:12:25 GMT

This thread is pretty old... 🙂

I could not figure out how to get the geometry edits to persist until i tried the method described below with the Geometry.Clone method. (In my case, I did not have to use the edit geometry StartEdit/StopEdit methods.)

Thank you!!

 
            foreach (var graphic in flayer.SelectedGraphics)
            {
                _edit_Geometry.StartEdit(graphic);
                ESRI.ArcGIS.Client.Geometry.Geometry geom = 
                    ESRI.ArcGIS.Client.Geometry.Geometry.Clone(graphic.Geometry);
                ESRI.ArcGIS.Client.Geometry.Polygon polygon = geom as ESRI.ArcGIS.Client.Geometry.Polygon;
                if (polygon != null)
                {
                    foreach (var ring in polygon.Rings)
                    {
                        IEnumerator<MapPoint> points = ring.GetEnumerator();
                        while (points.MoveNext())
                        {
                            points.Current.X = points.Current.X + changeinX;
                            points.Current.Y = points.Current.Y + changeinY;
                        }
                    }
                }
                graphic.Geometry = geom;
                _edit_Geometry.StopEdit();
                
            }