Re: [ANN] Lua Cario binding

[Hakki Dogusan <dogusanh@...>]

Hi,

Sam Roberts yazmış:
> On Fri, May 25, 2007 at 01:35:16AM +0300, Hakki Dogusan wrote:
> > I need your advice for cairo_matrix_t; It is declared as:
> >
> > typedef struct _cairo_matrix {
> >     double xx; double yx;
> >     double xy; double yy;
> >     double x0; double y0;
> > } cairo_matrix_t;
> >
> > And usage is like:
> >
> > cairo_matrix_t   matrix;
> > cairo_matrix_init_scale (&matrix, w * 5., h * 5.);
> > cairo_pattern_set_matrix (pattern, &matrix);
> >
> > Which one of the following is "Lua way"/practical?
> >
> > - named fields,ie:
> >   matrix = {xx=.5, yx=1.0, xy=.9, yy=.3, x0=.3, y0=.2}
>
> It looks like named fields would allow something more like:
>
>   matrix = cairo.matrix{scalex=0.5, scaley=0.5}
>   matrix = cairo.matrix{rotate=-0.2}
>
>   ... similarly with the various _init() functions from
>   ... http://cairographics.org/manual/cairo-cairo-matrix-t.html
>
>   ... then operate on it like:
>   m0 = matrix:translate{tx=4} -- ty = 0, by default
>
>   m = m0 * matrix

But this requires a user type. Being new to Cairo (and it's concepts), I 
thought, it is more meaningful to make a one-to-one binding first, then 
create Lua types on -or in addition to- it. Using Lunar is just habit, a 
simple namespace table would suffice. BTW, while translating snippets, 
it seemed two table would be more practical, ie:

Now:
C    cairo_set_operator (cr, CAIRO_OPERATOR_IN);
Lua  cairo:set_operator (cr, Cairo.OPERATOR_IN)

Better:
C    cairo_set_operator (cr, CAIRO_OPERATOR_IN);
Lua  cairo:set_operator (cr, CAIRO.OPERATOR_IN)


> Just throwing ideas out.

I appreciate, thank you!

> Cheers,
> Sam


--
Regards,
Hakki Dogusan