[GRASS-user] How one can find the starting and end point of a line in a vector file or how one can connect two line end to end using C code

[ivan marchesini]

don't know if can help but v.to.db give you coordinates of starting and
ending points of vector lines

to connect them I use v.edit

this is my pythin code

    startc=grass.read_command("v.to.db", flags="p", map="myline",
type="line", option="start", units="meters" , quiet=True)
    startx=float(startc.split("|")[1])
    starty=float(startc.split("|")[2])
    startz=float(startc.split("|")[3])
    endc=grass.read_command("v.to.db", flags="p", map="myline",
type="line", option="end", units="meters")	
    endx=float(endc.split("|")[1])
    endy=float(endc.split("|")[2])
    endz=float(endc.split("|")[3])

    tmpfile = grass.tempfile()
    pfile = open(tmpfile, 'w')
    print>> pfile, "L", "2", "1"
    print>> pfile, startx, starty, startz
    print>> pfile, endx, endy, endz
    print>> pfile, "1", i
    pfile.close()
    grass.run_command("v.edit", input=tmpfile, flags="n", tool="add",
map="mynewline", snap="node", thresh="1")


hope this help

Ivan


Il giorno sab, 03/03/2012 alle 11.24 +0530, SWAPAN GHOSH ha scritto:
> Hello,
>  
> Any one can solve me the problem like-" How one can find the starting
> and end point of a line in a vector file or how one can connect two
> line end to end using C code". If there is any change needed in code
> like C or  Python Script please suggest me. How I can do it.
>  
> Regards,
>  
> Swapan
> _______________________________________________
> grass-user mailing list
> grass-user at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/grass-user

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Ivan Marchesini
Perugia (Italy)
Socio fondatore GFOSS "Geospatial Free and Open Source Software" http://www.gfoss.it
e-mail: ivan.marchesini at irpi.cnr.it
        ivan.marchesini at gmail.com
fax (mailfax): +39 1782092534
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skype: geoivan73
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