[Therion] Hatching profiles and extended elevations

[Martin Sluka]

> 19. 4. 2020 v 13:46, Roger Schuster <roger at r-schuster.de>:
> 
> Hi all,
> 
> thank you for your answer. The problem with the direction arrow at section lines is solved. I had missed the explanation in the Therion book because I always just checked the documentation in foot note 27.
> 
> Last night I had the idea to solve the problem with hatching using an area. If I draw one invisible border (with -clip off) around the profile and use this as area (type water for example, with -clip off) the pattern also fills the inner part of the profile which I don't like to have. Next I tried to draw a second invisible border just outside of the profile and applied the area to the "gap" between the inner and outer border but this results in really weird patterns. I guess it's because the inner border behaves like a pillar. Of course I played around with different orientations of the borders. It never works as expected.

Check attached images. The trick is, the real scrap (section in this case) is filled by a colour white in this case). So the upper scrap clip the underlying background scrap. And I use wall:invisible as border for background scrap. I apologize myself, but it is 7 years now.

Martin

hatch.thconfig:

layout hatch

code metapost 

beginpattern(pattern_hatch);
    draw origin--10up withpen pensquare scaled (0.02u);
    patternxstep(.18u);
    patterntransform(identity rotated 125);
endpattern;

def a_u_hatch (expr Path) =
  T:=identity;
  thclean Path;
  thfill Path withpattern pattern_hatch;
enddef;

def a_u_white (expr p) =
      T:=identity;
      thfill p withcolor (1, 1, 1);
 enddef;

endlayout

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