Re: [Lib2geom-devel] Generate SVG paths from Geom::PathVector

[Vinícius d. S. O. <vin...@gm...>]

Em Qui, 2013-08-15 às 02:48 +0200, Krzysztof Kosiński escreveu:

> 2013/8/13 Vinícius dos Santos Oliveira <vin...@gm...>
> > Anyway, what I need is to do the other way back (generate a SVG file
> from some Geom::PathVector). The only code I found related to this
> functionality lies in the toys (not part of the lib) and uses a
> complicated scheme involving cairo and a lot of virtual func calls. Is
> there another way? If there is not, I want to implement it and I want
> to implement it fast. Would be possible to release another lib2geom
> version fast if code goes okay?
> 
> This functionality is already present in Inkscape, see
> src/svg/path-string.cpp. However, it would be a good idea to move it
> into 2Geom. Here is the optimal plan:


Should Inkscape::SVG::PathString become a wrapper around the
Geom::PathSink... like SPCurve is a wrapper around Geom::PathVector?


> 1. Make a method on SVGPathSink to output a PathVector into it. You
> can copy the relevant code with some modification from Inkscape, see
> src/svg/svg-path.cpp, or generalize the output_svg_path function.


I'm not sure if I understood what you mean. What I understood:

class SVGPathSink {
public:
    // ...

    // This function will read \p svgpath and make some calls to the
virtual methods
    // moveTo, hlineTo, vlineTo...
    void read(const Geom::PathVector &svgpath);
}


> 2. Derive from SVGPathSink and implement SVGPathDataBuilder, a class
> based on the code in src/svg/path-string.cpp.


I'll start from this.

The name DataBuilder is a bit generic. What do you think about
SVGPathTextBuilder? The name clearly exposes the intent.


-- 
Vinícius dos Santos Oliveira
https://about.me/vinipsmaker