[cairo] help with cairo_scale

[Andrea Cimitan]

On Thu, Dec 16, 2010 at 9:45 PM, Andrea Canciani <ranma42 at gmail.com> wrote:
> On Thu, Dec 16, 2010 at 8:11 PM, Andrea Cimitan
> <andrea.cimitan at gmail.com> wrote:
>> Hi guys, I'm playing with the new gtk-style-context code for a new
>> theming engine.
>> I'm trying to grab a cairo_pattern_t, which is given to me in a 1x1
>> format, so I need to scale it to my context and paint it.
>> I'm encountering some difficulties, even if it seems simple (might be
>> late for my brain :))
>>
>> so, with cairo_t* cr the context, cairo_pattern_t* pat as the pattern,
>> x, y, width, height the dimensions, I was doing
>>
>> cairo_rectangle (cr,  x, y, width, height);
>>
>> cairo_save (cr);
>>
>> cairo_scale (cr, width, height);
>> cairo_set_source (cr, pat);
>> cairo_stroke (cr);
>>
>> cairo_restore (cr);
>>
>> but the line width is all messed up, because it's scaled as well :(
>>
>> what am I doing wrong?
>
> You probably want to do:
> cairo_rectangle (cr,  x, y, width, height);
>
> cairo_save (cr);
> cairo_scale (cr, width, height);
> cairo_set_source (cr, pat);
> cairo_restore (cr);
>
> cairo_stroke (cr);
>
>
> See http://www.cairographics.org/manual/cairo-cairo-t.html#cairo-set-line-width
> for an explanatio of what is happening to your line width.
>
> Andrea
>
Already tried before, the problem is that it's like it's no applied,
because of the save & restore?


-- 
Andrea Cimitan - http://www.cimitan.com