I want to test polylines for closed polylines. Is there a transformer or easy way to do this? I realize that I can extract the points in the polylines with the vertex extractor and turn them into a list with the ListBuilder, but I can't figure out how to compare _list{0}._x with _list{-1}._x. The Tester does not allow _list{-1}._x. There is also no "ListPopper" that I can see.
Thanks
+17you can also extract the first and last (say x0 y0 and x1 y1) vertices instead of the list option and use the tester.
+17another option is to pass the lines into the areabuilder without any snapping.
Closed poly lines will be transformed into polygons not closed ones will be rejected.
Hope this helps.
+39Or use a geometry coercer, closed lines can be coerced into polygons, other lines will be output via the untouched port
Here's using a Tester and a formula entered into the arithmetic editor:
Closing polylines will be output as Passed.
You could also start with a Snapper with a Group By on the OBJECTID (or similar) and a tiny tolerance, if needed.
Or use a geometry coercer, closed lines can be coerced into polygons, other lines will be output via the untouched port
+39If you want to just do the coordinate comparison you can use two coordinate extractors one to get the start and one to get the end and then compare these two values, e.g.
I've put an idea forward for the coordinate extractor to be able to extract first and last coordinates only which would be useful for situations like this
https://knowledge.safe.com/idea/39951/coordinate-extractor-first-and-last-coordinates-on.html
Although after reading the answer from @david_r it's probably not necessary as I realise you could do this in a single transformer using the syntax suggested
+17Here's using a Tester and a formula entered into the arithmetic editor:
Closing polylines will be output as Passed.
You could also start with a Snapper with a Group By on the OBJECTID (or similar) and a tiny tolerance, if needed.
another option is to pass the lines into the areabuilder without any snapping.
Closed poly lines will be transformed into polygons not closed ones will be rejected.
Hope this helps.
+39
Here's using a Tester and a formula entered into the arithmetic editor:
Closing polylines will be output as Passed.
You could also start with a Snapper with a Group By on the OBJECTID (or similar) and a tiny tolerance, if needed.
If you want to just do the coordinate comparison you can use two coordinate extractors one to get the start and one to get the end and then compare these two values, e.g.
I've put an idea forward for the coordinate extractor to be able to extract first and last coordinates only which would be useful for situations like this
https://knowledge.safe.com/idea/39951/coordinate-extractor-first-and-last-coordinates-on.html
Although after reading the answer from @david_r it's probably not necessary as I realise you could do this in a single transformer using the syntax suggested
+39
If you want to just do the coordinate comparison you can use two coordinate extractors one to get the start and one to get the end and then compare these two values, e.g.
I've put an idea forward for the coordinate extractor to be able to extract first and last coordinates only which would be useful for situations like this
https://knowledge.safe.com/idea/39951/coordinate-extractor-first-and-last-coordinates-on.html
Although after reading the answer from @david_r it's probably not necessary as I realise you could do this in a single transformer using the syntax suggested
Hi there, why not use the ClosedCurveFilter transformer?
Hi there, why not use the ClosedCurveFilter transformer?
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.
