Re: [ANN] Lua Cario binding

[Sam Roberts <sroberts@...>]

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

Just throwing ideas out.

Cheers,
Sam