Re: lua cairo

[Hakki Dogusan <dogusanh@...>]

Hi,

Philippe Lhoste wrote:
> On 15/11/2007 02:03, Hakki Dogusan wrote:
> > You may get it here:
> > http://www.dogusan.net/dogusanh/download/luacairo-0.7.zip (~3.5Mb)
>
> I am testing it right now, starting by playing the demos and tests, of 
> course.
> They work fine, I think I will have some fun soon...
>
> BUT (there is often a but, no?) two demos fail after spitting out a 
> number of files:
>
> C:\PrgCmdLine\luacairo
>  > lua5.1.exe draw.c.lua
> lua5.1.exe: draw.c.lua:297: bad argument #2 to 'font_extents' 
> (cairo.FontExtents.mt expected, got table)
> stack traceback:
>         [C]: in function 'font_extents'
>         draw.c.lua:297: in function 'draw_textextents'
>         draw.c.lua:402: in function 'draw_diagram'
>         draw.c.lua:440: in function 'diagram'
>         draw.c.lua:466: in function 'main'
>         draw.c.lua:472: in main chunk
>         [C]: ?
>
> C:\PrgCmdLine\luacairo
>  > lua5.1.exe diagram.c.lua
> lua5.1.exe: diagram.c.lua:420: bad argument #1 to 'matrix_init' 
> (cairo.Matrix.mt expected, got table)
> stack traceback:
>         [C]: in function 'matrix_init'
>         diagram.c.lua:420: in function 'diagram'
>         diagram.c.lua:478: in function 'main'
>         diagram.c.lua:504: in main chunk
>         [C]: ?
>
> Running on WinXP Pro SP2.

Thanks for reporting.

My fault. I forgot to update these samples. Now, cairo_matrix_t, 
cairo_text_extents_t, cairo_fontt_extents_t are implemented as userdata 
(previosly they were tables).

You may get modified samples from 
http://www.dogusan.net/dogusanh/download.html#luacairo

luacairo-src.zip includes them too (111 Kb)


> Good work, anyway!

Thanks.

> PS.: don't search specifically, I did it and didn't find a clear answer. 
> But if you know a way to make animated Gifs with Cairo, I would be glad.
> Otherwise, I suppose I will generate a bunch of files and some tool to 
> assemble them in Gif format.
>
> Too bad MNG never took off.

As I see, there is no GIF surface in Cairo API (1.4.10).
There are only following configuration flags for surfaces:
CAIRO_HAS_SVG_SURFACE, CAIRO_HAS_PDF_SURFACE,
CAIRO_HAS_PS_SURFACE, CAIRO_HAS_XCB_SURFACE, CAIRO_HAS_XLIB_SURFACE, 
CAIRO_HAS_WIN32_SURFACE, CAIRO_HAS_BEOS_SURFACE, 
CAIRO_HAS_DIRECTFB_SURFACE, CAIRO_HAS_OS2_SURFACE, 
CAIRO_HAS_GLITZ_SURFACE, CAIRO_HAS_QUARTZ_SURFACE



--
Regards,
Hakki Dogusan