I'm not sure if I exactly understand your request. I assume you mean
that a polygon layer should be split in classes (visualized with
different patterns) based on the values from 3 fields. This should be a
standard setting using Mapserver definition of classes for the map file,
like
LAYER
...
CLASS
NAME "class_1"
EXPRESSION ('[founded]'='pottery' AND '[earth]'='sand'
AND '[stones]'='travertinic')
END
CLASS
NAME "class_2"
EXPRESSION ('[founded]'='pottery' AND '[earth]'='clay'
AND '[stones]'='granite')
END
END #Layer
with the EXPRESSION in 1 line.
It's also possible to use regular expressions. There is a how-to on the
MS homepage about expressions.
Note however, that the database fields must be included in the shapefile
attributes which makes it a bit static (maybe one can use OGR virtual
layers, but I've never tested them with p.mapper). Or use
Postgres/Postgis to store both geometry and attribute info.
armin
Emanuel Demetrescu wrote:
> Dear Armin,
>
>
> your work is great !! I use pmapper since 2005 but only as a hobby and
> scholarship user. Now I need to look for a solution to automatically
> draw patterns in a webgis.
>
>
> I explain: I am an archaeologist and I use gis platform to represent the
> archaeological stratigrafy. Each polygon has a database-record with
> three columns that describe the stratum: objects founded, kind of earh,
> small stones.
>
>
> I need each polygon to have a pattern that is the amount of three
> patterns, i.e. :
>
>
> objects founded=pottery, kind of earth=sand, stones=travertinic stone
>
>
> the pattern has to be the amount of all the three patterns above.
>
>
> How can I obtain it ?? Is it only a patterns matter ? Is it possible
> with pmapper ? Is a limitation of the map file ?
>
>
> I prefer to use an open solution and I am looking for a platform that
> allow an accurate pattern restitution.
>
>
> Thanks !! Emanuel
>
>
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