topic Re: Line feature - get number of vertices in Python Questions

Line feature - get number of vertices

OlivierOlivier — Sun, 01 Jan 2012 17:38:47 GMT

Hi,

I'm searching a way to get the number of vertices composing a line, without counting them. I have not many experiences in Python, but unless I missed something searching forums and documentation, it seems that it's not a feature property as I expected. Am I right ?

Thanks to all answers

Olivier

Re: Line feature - get number of vertices

FrédéricPRALLY — Sat, 11 Dec 2021 07:12:16 GMT

Hi Olivier,

To calculate the number of vertices composing a line, you can use calculate fields using logic with Python.

See sample below:

Parser:
Python

Expression:
getNumberOfVertices( !Shape!)

Code Block:
def getNumberOfVertices(feature):
    partnum = 0
    vertices = []
    while partnum < feature.partCount:
        part = feature.getPart(partnum)
        pnt = part.next()
        pntcount = 0
        while pnt:
            vertices.append(pntcount)
            pnt = part.next()
            pntcount+=1
        partnum+=1
        
    return len(vertices)

or load getNumberOfVertices.cal in joined file.

Have a good day,

Best regards,

Fred

Re: Line feature - get number of vertices

OlivierOlivier — Mon, 02 Jan 2012 09:09:26 GMT

Hi Frederic,

Thanks for this kind answer, it will improve my basic python knowledge. I hoped that vertices would be an attribute of each line feature but it amazingly seems that it's not the case.

Happy New Year,

Olivier