You just need to remove filling from symbol definition.

In your layout, try to use for example this code:

code metapost

def a_blocks (expr p) =

  T:=identity;

  pickup PenC;

  path q, qq; q = bbox p;

  picture tmp_pic; 

  uu := max(u, (xpart urcorner q - xpart llcorner q)/100, (ypart urcorner q - ypart llcorner q)/100);

  tmp_pic := image(

    for i = xpart llcorner q step 2uu until xpart urcorner q:

      for j = ypart llcorner q step 2uu until ypart urcorner q:

        qq := punked (((-.5uu,-.5uu)--(.5uu,-.5uu)--(.5uu,.5uu)--(-.5uu,.5uu)--cycle) 

    randomized (uu/2))

             rotated uniformdeviate(360) 

             shifted ((i,j) randomized 1.6uu);

if xpart (p intersectiontimes qq) < 0:

 thdraw qq;

fi;

      endfor;  

    endfor;

  );

  clip tmp_pic to p;

  draw tmp_pic;

enddef;

This is modified a_blocks_SKBB definition with "thclean qq;" statement removed.

S.

On 4 November 2012 19:37, Bruce <bruce@tomo.co.nz> wrote:

> How can I get use "area blocks" to behave like other sediments when I
want colors (and no filling)?

Torstein

You will need to either choose a predefined 'area blocks' that does not have
a solid fill from the standards available - currently AUT and SKBB are the
only unique ones I think - and quite possibly they are both filled.

Or you will need to modify the existing definitions.

I have no time to check just now, but you might like to have a look at what
I did here http://therion.speleo.sk/wiki/doku.php/examples (Sample dataset
at the top of the page) and modify it a bit to see how it behaves with
colour assignments.

Bruce



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