You just need to remove filling from symbol definition.<div><br></div><div>In your layout, try to use for example this code:</div><div><br></div><div>code metapost</div><div><div>def a_blocks (expr p) =</div><div>  T:=identity;</div>

<div>  pickup PenC;</div><div>  path q, qq; q = bbox p;</div><div>  picture tmp_pic; </div><div>  uu := max(u, (xpart urcorner q - xpart llcorner q)/100, (ypart urcorner q - ypart llcorner q)/100);</div><div>  tmp_pic := image(</div>

<div>    for i = xpart llcorner q step 2uu until xpart urcorner q:</div><div>      for j = ypart llcorner q step 2uu until ypart urcorner q:</div><div>        qq := punked (((-.5uu,-.5uu)--(.5uu,-.5uu)--(.5uu,.5uu)--(-.5uu,.5uu)--cycle) </div>

<div><span class="" style="white-space:pre">	</span>     randomized (uu/2))</div><div>             rotated uniformdeviate(360) </div><div>             shifted ((i,j) randomized 1.6uu);</div><div><span class="" style="white-space:pre">	</span>if xpart (p intersectiontimes qq) &lt; 0:</div>

<div><span class="" style="white-space:pre">	</span>  thdraw qq;<br></div><div><span class="" style="white-space:pre">	</span>fi;</div><div>      endfor;  </div><div>    endfor;</div><div>  );</div><div>  clip tmp_pic to p;</div>

<div>  draw tmp_pic;</div><div>enddef;</div></div><div><br></div><div>This is modified a_blocks_SKBB definition with &quot;thclean qq;&quot; statement removed.</div><div><br></div><div>S.</div><div class="gmail_extra"><br>

<br><div class="gmail_quote">On 4 November 2012 19:37, Bruce <span dir="ltr">&lt;<a href="mailto:bruce@tomo.co.nz" target="_blank">bruce@tomo.co.nz</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">

<div class="im">&gt; How can I get use &quot;area blocks&quot; to behave like other sediments when I<br>
want colors (and no filling)?<br>
<br>
Torstein<br>
<br>
</div>You will need to either choose a predefined &#39;area blocks&#39; that does not have<br>
a solid fill from the standards available - currently AUT and SKBB are the<br>
only unique ones I think - and quite possibly they are both filled.<br>
<br>
Or you will need to modify the existing definitions.<br>
<br>
I have no time to check just now, but you might like to have a look at what<br>
I did here <a href="http://therion.speleo.sk/wiki/doku.php/examples" target="_blank">http://therion.speleo.sk/wiki/doku.php/examples</a> (Sample dataset<br>
at the top of the page) and modify it a bit to see how it behaves with<br>
colour assignments.<br>
<br>
Bruce<br>
<br>
<br>
<br>
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</blockquote></div><br></div>