Hi all I have changed the definition from area blocks and inserted a variable "distance" like in the example "AREA BLOCK + density adjust (distance) Stefan Oswald" you can find here: http://therion.speleo.sk/wiki/doku.php/metapost?s[]=area&s[]=blocks&s[]=density#cave_symbol_size_and_density_examples
This is working well in the map but there is a little other problem now. Depending on the "distance" (e.g. I use 1.8) the field in the legend for this area is empty now. If I use other numbers I can find a part of a block in the legend symbol or just one small or .... Is there any chance to influence the field or let's say the "filling" of this field independend from the area itself? Does anyone have this problem as well? Is there any solution for that? Thanks for your help, Torsten