topic Cut Geometry method causing multipart feature in ArcGIS Runtime SDK for iOS Questions

Cut Geometry method causing multipart feature

JeffGiesler — Mon, 27 Aug 2012 18:38:53 GMT

Hey Everyone,
I am trying to use the cut geometry method using the geometry engine. If I cross the feature once with the cutting geometry I get to different features as expected but if I cross the feature twice then I still only get two feature with the one being a multipart feature. Does anyone know how to fix this or prevent it from happening? If I am not clear in my explaination let me know and I will draw something to explain it better.
Cheers,
Jeff

Re: Cut Geometry method causing multipart feature

NimeshJarecha — Mon, 27 Aug 2012 20:00:05 GMT

Please go through information in geometry operations doc. If this does not answer your question then please explain more.

Regards,
Nimesh

Re: Cut Geometry method causing multipart feature

JeffGiesler — Tue, 28 Aug 2012 14:37:43 GMT

Nimesh,
Unfortunately the documentation doesn't answer my question. I have attached a pdf that shows the results that I am getting and what I would like to get. If the results I want are not possible,thats fine I will just need to limit what the user can do. I hope this make my question more clear.
Cheers,
Jeff

Re: Cut Geometry method causing multipart feature

NimeshJarecha — Tue, 28 Aug 2012 15:17:51 GMT

The result of cut will always have TWO geometries (right side and left side of cutter geometry). Unfortunately, it is not possible to have THREE geometries you are expecting.

Hope this answers your question.

Regards,
Nimesh

Re: Cut Geometry method causing multipart feature

JeffGiesler — Fri, 31 Aug 2012 18:49:47 GMT

Nimesh,
This certainly answers my question. Not the answer I had hoped for. I guess is there a way to break apart multipart features then?
Cheers,
Jeff

Re: Cut Geometry method causing multipart feature

NimeshJarecha — Wed, 05 Sep 2012 19:44:06 GMT

Unfortunately, there is no tool/operation to convert multipart geometry into multiple single part geometries.

Regards,
Nimesh

Re: Cut Geometry method causing multipart feature

DiveshGoyal — Fri, 07 Sep 2012 16:55:51 GMT

As a workaround, you can loop through the rings of the multipart polygon (or paths of a multipart polyline) and create a separate geometry for each part.

Re: Cut Geometry method causing multipart feature

JeffGiesler — Tue, 11 Sep 2012 19:19:50 GMT

Divesh,
That sounds like a very plausible idea but I seem to be failing in how to find a way to loop through the ring or paths. do you have any idea how to get them.
cheers,
Jeff

Re: Cut Geometry method causing multipart feature

ParmeswarGiri — Fri, 30 Nov 2012 09:05:07 GMT

Hey Everyone,
I am trying to use the cut geometry method using the geometry engine. If I cross the feature once with the cutting geometry I get to different features as expected but if I cross the feature twice then I still only get two feature with the one being a multipart feature. Does anyone know how to fix this or prevent it from happening? If I am not clear in my explaination let me know and I will draw something to explain it better.
Cheers,
Jeff

Hi jeff,

I am having problem with left geomentry and right geomentry. Please explain me how to define the left geomentry and right geomenty of polyline in topologicalOperator cut method.

Giri

Re: Cut Geometry method causing multipart feature

ParmeswarGiri — Fri, 30 Nov 2012 13:07:40 GMT

Dear all,

Can anyone explain me how to define left geomentry and right geomentry in cut geomentry method.

Thanks

Giri

Re: Cut Geometry method causing multipart feature

JeffGiesler — Sat, 08 Dec 2012 16:42:50 GMT

Giri,
I am not sure I understand your question clearly. ItopologicalOperator is ArcObjects and this is an IOS forum but I will see if I can help you anyway. I have limited use of this operation but I think this is how it works and this is I have worked with other Itopologicaloperator operations. First create your topologicaloperator, create an IGoemetry for both you left and right geometry, then run the operation. I think it should look something like this (not tested) and I haven't worked in ArcObjects in awhile.

IPolyline CuttingLine = (IPolyline)CuttingFeature.Shape:ITopologicalOperator topo = ITopologicalOperator)shape; // IPolygon or IPolygon of the feature you want to cut
IGeometry LeftGeo = null;
IGeometry RightGeo = null;
topo.cut(CuttingLine, ref LeftGeo, ref RightGeo);

Here is the link to the to the API Reference for the operation http://resources.arcgis.com/en/help/arcobjects-net/componenthelp/index.html#/Cut_Method/002m000003vq000000/. It can help explain further if you need it.

Hope this helps or you have found your answer.

Cheers,
Jeff