[Roadster] Cairo question

[Ian McIntosh]

Ehud,

Carl's right about the hack that Roadster uses.  It's a complicated
problem with a simple solution.

And it works equally well in GDK rendering as well (just doesn't look as
nice!).

-Ian

El lun, 29-08-2005 a las 09:49 -0700, Carl Worth escribió:
> On Sat, 27 Aug 2005 18:17:50 +0300, Ehud Shabtai wrote:
> > Looking at the screenshots, roadster seems to be able to draw roads
> > which are bound by a thin black line. How can that be done with cairo?
> > Are there any settings which cause cairo to draw the bounding lines
> > automatically or does roadster draws the roads as thick lines and then
> > manually draws the bounding thin lines?
> 
> The roadster hack is even simpler than that. I believe it first draws
> a thick stroke, and then afterwards draws a very-slightly-less-thick
> stroke in a different color, leaving only a thin portion of the
> original stroke color visible.
> 
> That's a pretty cute hack for some missing functionality in
> cairo. We've had an item on our TODO list for quite some time which is
> to add a new call:
> 
> 	void
> 	cairo_stroke_to_path (cairo_t *cr);
> 
> which will replace the current path with a path that follows the
> outline that would be made by calling cairo_stroke. This new function
> will allow much more general effects, (such as stroking the outline of
> a wide stroke but without disturbing the interior regions of the wide
> stroke).
> 
> -Carl
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