Re: [Lib2geom-devel] Subpath from path by length?

[mathog <ma...@ca...>]

On 04-Sep-2012 13:24, Krzysztof Kosiński wrote:
> 2012/9/4 mathog <ma...@ca...>:
>> I don't see what a 0->1 "t" could be in this situation other than by
>> first calculating the length of P and then
>> making it a fraction of that length.
>
> For paths, the 't' parameter goes not from 0 to 1 but from 0 to N,
> where N is the number of curves in the path.


Ok, that makes sense.

Here is a particularly nasty typo, which compiled without even a 
warning:

        Geom::Piecewise<Geom::D2<Geom::SBasis> > tmp_pathpw;
        for (unsigned int i=0; i < pathv.size(); i++) {
           tmp_pathpw.concat(pathv[i].toPwSb());
        }
        Geom::PathVector out_pathv = 
Geom::path_from_piecewise(tmp_pathpw, 0,01);
        print_pathv(out_pathv, tf);

but exploded when it ran.  Change "0,01" to "0.01" and it works as 
expected.

Thanks,

David Mathog
ma...@ca...
Manager, Sequence Analysis Facility, Biology Division, Caltech