topic Re: Reshape overlapping polygons after editing vertices in ArcGIS API for Silverlight Questions

Reshape overlapping polygons after editing vertices

ArtUllman — Tue, 22 Nov 2011 15:19:36 GMT

I am working on an application that allows users to update polygons using the Editor Class (not the Editorwidget) and the EditVertices function. After a user updates a polygon, they may overlap an adjoining polygon. I take the resulting geometry and query for all polygons that overlap. I would like to use the Reshape Function to reshape these overlapping polygons based on the new geometry. How can I call call the reshape function in code to modify these overlapping polygons.

I would think this is something that alot of developers would need to do in an online editing situation.

Thanks.

Re: Reshape overlapping polygons after editing vertices

WeifengHe — Tue, 22 Nov 2011 16:55:25 GMT

If you have an array of polygons need to be reshaped, call IGeometryServer2.Reshape method will do the job, using the boundary of the new polygon as input polyline.

You can also call ITopologicalOperator.Difference to work on one polygon at a time.

Re: Reshape overlapping polygons after editing vertices

ArtUllman — Tue, 22 Nov 2011 17:10:09 GMT

I am coding in a silverlight application, so I do not have access to arcobjects classes. Geometry services have a reshape function, which I was going to try. However, I know that the Editor class in Silverlight has a Reshape tool, but I am looking for some information on how to use it to reshape one polygon after changing another polygon using editvertices.

Here is what I am trying to figure out. Editor has a Reshape ICommand property. I can't find any sample or documentation showing how to call Reshape from code.

Re: Reshape overlapping polygons after editing vertices

JenniferNery — Wed, 23 Nov 2011 03:31:31 GMT

You can look at the following SDK sample: http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#Reshape.
You might also want to check AutoComplete: http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#AutoComplete

The interactive way to reshape or auto complete a polygon would be to use Editor.Reshape or Add command, respectively. http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#EditToolsAutoSave. If AutoSelect is checked or after you have made selections, you can add near the selected feature and auto-complete against the selected feature. You can also reshape selected feature by drawing a polyline cutter.

Re: Reshape overlapping polygons after editing vertices

ArtUllman — Wed, 23 Nov 2011 13:00:23 GMT

Thanks. I am going to call the Geometry Service as described in the sample. I was thinking that I could use the Editor class in code rather than interactively, but I can not find any good explanation of how to do this. The geometry service should do the trick.

Re: Reshape overlapping polygons after editing vertices

JenniferNery — Sat, 11 Dec 2021 21:24:22 GMT

You can call Reshape in code-behind, but drawing the cutter is still interactive.

if(editor.Reshape.CanExecute(null)) // this is true if there are selected features
    editor.Reshape.Execute(null); // activates Reshape, you can begin drawing the cutter.

If you already have the cutter, you can use GeometryService to do Reshape.

Re: Reshape overlapping polygons after editing vertices

ArtUllman — Wed, 23 Nov 2011 17:29:36 GMT

Thanks. I wrote a solution using the geometry service. I want the operation to run without user interaction. I was curious if I could run the editor.Reshape without user interaction and you answered my question. Thank you for your assistance.