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 at 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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> Therion at speleo.sk
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>
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