[cairo] cairo_clip()-related question

[Alexei Babich]

Hello, all.

The sample file is here attended.
In the end of the file there are some commented lines.
Running the program as it is the drawing appears. In case the lines are uncommented no drawing appears, unless it's expected to.
Can someone suppose where I am wrong?

Thank you.
-- 
Regards,
Alexei Babich, circuit engineer, OOO NPP "Rezonans", Chelyabinsk, Russia
http://www.rez.ru
Jabber ID: impatt at jabber.ru
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