[cairo] Answering my own queston - Region_t - Re: one question answered, and another comes (Re: FT_Bitmap_Convert, and FreeType's bitmap format vs Cairo's)
htl10 at users.sourceforge.net
Tue Apr 25 13:27:26 UTC 2017
To answer my own question again - cairo has a cairo_region_intersect() and cairo_region_intersect_rectangle().
This is almost as good as the numpy vector sum. (the vector sum can pack tighter).
Unfortunately these are only exposed to python via either a python3-specific custom patch which Ubuntu/Debian carries
(Fedora certainly does not), or use the recently merged pycairo 1.11 released a couple of weeks ago.
(or qahirah). I'll go the pycairo 1.11+ path.
Not quite sorry for the noise - Google doesn't really have answers to these :-).
On Tue, 25/4/17, Hin-Tak Leung <htl10 at users.sourceforge.net> wrote:
One of freetype-py's drawing example
uses a vector sum between a clip of the drawing surface with
the current drawing pattern to see if we are drawing over
something that's already drawn in this single line:
x-w//2:x-w//2+w,0] * L).sum() == 0:
i.e. this calculates if L will draw on
anything previously drawn in I. I am trying to figure out
how to do this in cairo.
How does one check if two shapes
overlap, or two paths intersect, in cairo?
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