[cairo] set_matrix affect stroke?

[Jerónimo Barraco]

that was nice info, though i think the context allows a method called  
init_matrix()
but i have no idea if it's better/faster. maybe you should take into  
account that using python maybe there's an overhead with the object  
creation (the empty matrix)

so instead of
cairo_ctx.set_matrix(cairo.Matrix())
you could use
cairo_ctx.init_matrix()

at least that's what i've been using.

c ya.

On Thu, 13 May 2010 15:31:20 -0300, Stuart Axon <stuaxo2 at yahoo.com> wrote:

>> On Wed, 12 May 2010, Stuart Axon wrote:
>>
>> > I'm still getting a weird error where I get a really fat stroke.
>>
>> The line width of a stroke is set in userspace units in effect at
>> cairo_stroke() time.  One tip for getting consistent line widths is to
>> reset the matrix to a constant state and set the line width just
>> before the cairo_stroke() call.
>>
> Cheers, this was exactly what I needed to do, for anyone googling
> this, my draw function now looks like this:
>
>         # Go to initial point (CORNER or CENTER):
>         transform = self._call_transform_mode(self._transform)
>         cairo_ctx.set_matrix(transform)
>         # Run the path commands on the cairo context:
>         self._traverse(cairo_ctx)
>         ## Matrix affects stroke, so we need to reset it:
>         cairo_ctx.set_matrix(cairo.Matrix())
>         if self._fillcolor:
>             cairo_ctx.set_source_rgba(*self._fillcolor)
>             if self._strokecolor:
>                 cairo_ctx.fill_preserve()
>             else:
>                 cairo_ctx.fill()
>         if self._strokecolor:
>             cairo_ctx.set_line_width(self._strokewidth)
>             cairo_ctx.set_source_rgba(*self._strokecolor)
>             cairo_ctx.stroke()
>
>
>
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