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

[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 "="). The last 
part above is also wrong and
push_back causes:

splivarot.cpp: In function ‘Geom::PathVector sp_pathvector_boolop(const 
PathVector&, const PathVector&, bool_op, fill_typ, fill_typ)’:
splivarot.cpp:319:27: error: no matching function for call to 
‘std::vector<Geom::Path>::push_back(std::vector<Geom::Path>::const_iterator&)’
splivarot.cpp:319:27: note: candidate is:
/usr/include/c++/4.6/bits/stl_vector.h:826:7: note: void 
std::vector<_Tp, _Alloc>::push_back(const value_type&) [with _Tp = 
Geom::Path, _Alloc = std::allocator<Geom::Path>, std::vector<_Tp, 
_Alloc>::value_type = Geom::Path]
/usr/include/c++/4.6/bits/stl_vector.h:826:7: note:   no known 
conversion for argument 1 from ‘std::vector<Geom::Path>::const_iterator 
{aka __gnu_cxx::__normal_iterator<const Geom::Path*, 
std::vector<Geom::Path> >}’ to ‘const value_type& {aka const 
Geom::Path&}’

So what is the proper syntax to get from tpathv to outres???

Thanks,

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