topic Re: How calculate polygon dimensions in Geoprocessing Questions

How calculate polygon dimensions

NajdALHanahnah — Tue, 19 Aug 2014 06:09:46 GMT

Dear All

There is a way to calculate polygon dimensions (Side) , if i ma working on ArcObject (Java or .NET) any suggestions ...

especially with complex polygon

Thanks

Re: How calculate polygon dimensions

DanPatterson_Retired — Tue, 19 Aug 2014 06:33:40 GMT

I think the term is "perimeter" that you are looking for. Did you do a search using arcobjects perimeter first?

Re: How calculate polygon dimensions

NajdALHanahnah — Tue, 19 Aug 2014 07:05:30 GMT

Dear Mr.Dan

I am not looking for perimeter i am looking for dimensions for each side ...

see what i meant >>>

Re: How calculate polygon dimensions

nicogis — Tue, 19 Aug 2014 09:55:21 GMT

you can see code in this link : IPolygon4.ExteriorRingBag Property (ArcObjects .NET 10 SDK)‌

in this code when you loop on points you can get distance from point(i) to point(i+1) ...

Re: How calculate polygon dimensions

nicogis — Tue, 19 Aug 2014 10:00:49 GMT

... if your polygons are composed from only lines ...

Re: How calculate polygon dimensions

RiyasDeen — Tue, 19 Aug 2014 13:36:09 GMT

Below my suggestion, never implemented this scenario personally before just a possible solution

Cast your polygon to ISegmentCollection
Iterate through each segment
Use ReturnTurnDirection ArcObjects 10 .NET SDK Help‌ on your segments
If No Turn returned ArcObjects 10 .NET SDK Help then sum your segment length
Whenever there is a turn break your summation and restart
At the end you loop you would have got your dimensions.

Re: How calculate polygon dimensions

NajdALHanahnah — Tue, 19 Aug 2014 20:19:30 GMT

Thanks Riyas for your post , i saw what you put and really interesting idea , but how i can do that in coding level , if

you have any idea plz help me ...thanks

Re: How calculate polygon dimensions

RiyasDeen — Wed, 20 Aug 2014 01:06:29 GMT

Hi Najd,

Try below code.

Note: Even if there is a suttle change in direction between segments (i.e. not exactly 180 degree), it'll be treated as change and gets counted as different section.

Do post back if this worked.

                        ISegmentCollection segments = (ISegmentCollection)lta.Shape;
                        List<double> dimensions = new List<double>();
                        if (segments != null)
                        {
                            double length = 0;
                            for (int idx = 0; idx < segments.SegmentCount; idx++)
                            {
                                ISegment currentSegemnt = segments.get_Segment(idx);
                                
                                if (idx + 1 < segments.SegmentCount)
                                {
                                    ISegment otherSegment = segments.get_Segment(idx + 1);


                                    if (currentSegemnt.ReturnTurnDirection(otherSegment) != 1)
                                    {
                                        dimensions.Add(length);
                                        length = 0;
                                    }
                                }
                                else
                                {
                                    dimensions.Add(length);
                                }
                            }
                        }

Re: How calculate polygon dimensions

NajdALHanahnah — Wed, 20 Aug 2014 05:53:23 GMT

Hi Riyas

Thanks for your post , really appropriate that m, let me test it today and i will give you the feedback ...

thanks