topic Re: Detect if the line segment is of type "ICurve" in ArcObjects SDK Questions

Detect if the line segment is of type "ICurve"

HaythamAbdel-Rahman — Mon, 13 Jan 2014 12:45:53 GMT

I'm using ArcGIS 10.1, and I have polyline feature Class, some of it's features have curves in it, how can I detect these features?

Re: Detect if the line segment is of type "ICurve"

NeilClemmons — Mon, 13 Jan 2014 14:34:36 GMT

You'll have to loop through the segment collection of each feature's geometry. Use TypeOf (VB.NET) or Is (C#) to see if a segment implements one of the interfaces associated with curves (i.e. ICircularArc, IEllipticArc, etc). Unless they've added some new types recently, pretty much anything that isn't a Line is a curve of some type. So, you could just test the segment to see if it isn't ILine.

Re: Detect if the line segment is of type "ICurve"

LeoDonahue — Mon, 13 Jan 2014 15:27:11 GMT

I'm not sure it's that easy to just test whether it implements ICurve. You can see that even ILine implements ICurve.

As Neil suggested, you might want to test for the types of Curves you think your polyline featureclass contains. You will have test each feature in your featureclass.

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Re: Detect if the line segment is of type "ICurve"

LeoDonahue — Mon, 13 Jan 2014 15:41:42 GMT

What if you got the first and last points in the segment and created a new line segment then tested whether any of the middle points intersect that line?

[edit]
That won't work either, depending on how the feature was digitzed. I'm no help. 🙂

Re: Detect if the line segment is of type "ICurve"

Anonymous User — Mon, 13 Jan 2014 16:08:53 GMT

The easier way to check is to cast each feature into a segment collection then use the ISegmentCollection.HasNonLinearSegments Method.

Re: Detect if the line segment is of type "ICurve"

LeoDonahue — Mon, 13 Jan 2014 16:12:01 GMT

Sean,

Would the ITopologicalOperater isSimple() give you the same result?

Re: Detect if the line segment is of type "ICurve"

Anonymous User — Mon, 13 Jan 2014 16:45:55 GMT

Would the ITopologicalOperater isSimple() give you the same result?

Not really in this case. isSimple will just tell you if a geometry is topological correct regardless of the geometry type, whereas the original question was more about 'does my feature have any curves in it.

Re: Detect if the line segment is of type "ICurve"

HaythamAbdel-Rahman — Tue, 14 Jan 2014 03:40:18 GMT

Thanks a lot guys for the two solutions, i'll try both and tell you the results. Thanks again.

Re: Detect if the line segment is of type "ICurve"

WeifengHe — Tue, 14 Jan 2014 22:31:51 GMT

If you want to know which type of curve in your geometry, get the GeometryType property of ISegment.