topic Re: How can I Split A polygon and how can I merge serveral polygon in ArcGIS JavaScript Maps SDK Questions

How can I Split A polygon and how can I merge serveral polygon

xiaoyunnsongb — Tue, 12 Aug 2014 09:18:49 GMT

Dear superiors:

Now I have a question to request ,please lost several minutes.

Q1: How can i split a polygon

now there is a polygon A,when i draw a line, then the polygon split to two (A1,A2).

pic one

pic two

Q2:How can i merge serveral polygon to one

now there is two or more than two polygons next (A1,A2) ,when I press Ctrl key ,then the polygons all be choiced ,how can I merge then to one(A)

like the picture up pic two ------> pic one

Re: How can I Split A polygon and how can I merge serveral polygon

BartSmit — Tue, 12 Aug 2014 09:21:38 GMT

there should be a 'merge' option in the menu on your editor toolbar. Make sure you have only features selected from the same layer otherwise the merge will not work.

Re: How can I Split A polygon and how can I merge serveral polygon

xiaoyunnsongb — Tue, 12 Aug 2014 09:27:38 GMT

Dear Mr Bart Smit:

Thanks very much.

Is it esri/dijit/editing/Editor? Yes in a layer, How can i split the polygon?

Best wishes

Re: How can I Split A polygon and how can I merge serveral polygon

BartSmit — Tue, 12 Aug 2014 09:47:03 GMT

hhm, I'm afraid I spoke too soon. I can't find any code that has merge/split. All I can find is vertex/move/snap etc .. It might have been a geoprocessing service that offered that functionality. Or it might not have been esri stuff.. I can't recall the example. I'm sorry.

Re: How can I Split A polygon and how can I merge serveral polygon

xiaoyunnsongb — Wed, 13 Aug 2014 08:22:34 GMT

Dear Bart Smit：

Also thanks to you。

Re: How can I Split A polygon and how can I merge serveral polygon

xiaoyunnsongb — Wed, 13 Aug 2014 08:25:26 GMT

Superiors：

My function is in javascript Of html ，not desktop， thanks very much。

Re: How can I Split A polygon and how can I merge serveral polygon

MonyrothLy — Wed, 13 Aug 2014 08:36:32 GMT

U can use the cut polygon tool

Re: How can I Split A polygon and how can I merge serveral polygon

xiaoyunnsongb — Wed, 13 Aug 2014 08:50:04 GMT

Dear monyrothly：

Thanks very much. But I still not understand, Can you give the component in esri,

Wish you happy every day.

Re: How can I Split A polygon and how can I merge serveral polygon

JoshHevenor — Wed, 13 Aug 2014 17:49:33 GMT

You'll need the geometryService:

geometryservice-amd | API Reference | ArcGIS API for JavaScript‌

This will get you geometries and you can update/create your features for saving as required. Here's how I've done this.

Split:

- Start with a selected polygon (know what you're splitting)

- Use the draw toolbar to get a line (onDrawEnd Event)

- I use the GeometryService->trimExtend to make sure the line will cut completely

- Use geometryService->cut([selectedPoly], newLine, ...) to get two new polys

- save the new polys (add two new and delete old, or whatever works for your data)

Merge

- Select multiple polygons

- geometryService->union([selectedPolys]) to get one poly

- save the new poly (delete the old, add new, etc).

I haven't touched on managing the attributes, but that shouldn't be bad once you have the geometries: