Re: [Lib2geom-devel] lib2geom basics: define pathvector, define ellipse, define intersection

[Krzysztof K. <twe...@gm...>]

2012/9/7 mathog <ma...@ca...>:
> On 04-Sep-2012 18:02, Krzysztof Kosiński wrote:
>> 2012/9/5 mathog <ma...@ca...>:
>
>>> Can livarot be used that way?
>>
>> Not without modifications.
>>
>> The relevant function is in splivarot.cpp, lines 115-602. You can try
>> to take everything after the input validation bits (they end around
>> line 239) and turn that into a new function that will take
>> pathvectors, then call this new function from the original.
>
> I tried that today and got it to the point where it would compile and
> create result of type "Path" (livarot Path, not Geom Path) containing
> the result.
> I can see this as
>
> std::cout << "result is: " << res->svg_dump_path() << std::endl;
>
> at that point shows a reasonable looking string for an SVG path for the
> test case:
>
>   M 135.09375 531.25 L 135.09375 799.8125 C 135.09375 799.8125 148.51709
> 791.90059 169.90625 782.96875 L 169.90625 531.25 L 135.09375 531.25 z
>
> However there seems to be no method in livarot to convert livarot Path
> to Geom::Path. So
> I went looking for methods to convert that SVG text string to
> Geom::PathVector directly
> and came up empty.  The best I have come up with so far (and this will
> not compile):
>
>      Geom::PathVector outres;
>      std::vector<Geom::Path> tpathv =
> Geom::parse_svg_path(res->svg_dump_path());
>      for (std::vector<Geom::Path>::const_iterator pit = tpathv.begin();
> pit != tpathv.end(); ++pit){
>        outres.push_back(pit);
>      }
>
> I thought Geom::PathVector was actually the same thing as
> std::vector<Geom::Path>>, but
>    outres = tpathv;
> is not accepted (it doesn't know what to do with the "=").

IIRC that's because Geom::Path is not assignable.
You are missing a dereference:

outres.push_back(*pit);

Regards, Krzysztof