Re: [MacPerl-Toolbox] How does MacPerl Know to set up PICT environment?

[Matthias Neeracher <neeri@iis.ee.ethz.ch>]

In article <3820A733.670A74B6@becktek.com>, Stephen Beck <beck@becktek.com> writes:

> I've been poring over the sample progs in MPPE, e.g.:

Ah! Powerful MPPE is! Much knowledge poring over it brings!

> sub draw_it {
>  PaintOval()
>  ...
> }

> QuickDraw.pm and .xs, Inside Macintosh, and MacPerl source code,
> and now have decided I should ask:

> How does MacPerl know it needs to set up the PICT environment to
> handle the QuickDraw calls appearing in the draw_it routine?

These calls are not part of a picture. They draw directly, in reponse to an
update event. The propagation of the update event into the draw_it call is
done by the MacWindow framework in reponse to a

$win->sethook("redraw", \&draw_it)

call.

Matthias

-- 
Matthias Neeracher   <neeri@iis.ee.ethz.ch>   http://www.iis.ee.ethz.ch/~neeri
  "And that's why I am going to turn this world upside down, and make
   of it a fire so *bright* that someone real will notice"
                                -- Vernor Vinge, _Tatja Grimm's World_

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