[Therion] How to avoid that symbol-colour area blocks fills the blocks with chosen color

[Bruce]

Oh to be proficient in metapost!
Martin, that may be the tip I have been looking for.  I will experiment with
this sometime.  It also depends on how various pdf readers and printer
drivers interpret the different approaches.

I presume your recommendation applies to areas defined using
drawing/clipping to the path, and not areas defined using patterns?

And is it better to use
 drawoptions();
or
 thdrawoptions();
?

Bruce

-----Original Message-----
From: therion-bounces at speleo.sk [mailto:therion-bounces at speleo.sk] On Behalf
Of Martin Budaj
Sent: Tuesday, 6 November 2012 6:39 a.m.
To: List for Therion users
Subject: Re: [Therion] How to avoid that symbol-colour area blocks fills the
blocks with chosen color

Another solution is to leave "thclean qq" on its original position and
change

  clip tmp_pic to p;
  draw tmp_pic;

to

  clip tmp_pic to p;
  drawoptions();
  draw tmp_pic;

at the end of the macro definition. This approach preserves filling
the blocks with a background colour. I think all built-in symbols
should be updated in this way.

Martin