[cairo] set_matrix affect stroke?

[Stuart Axon]

> 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()