AW: [mapserver-dev] RFC49: mapfile simplifications and symbologyenhancements

Karsten Hoffmann khoffmann at
Thu Dec 4 05:45:39 EST 2008

Dear developers,

I would like to ask for another feature which could be perhaps included in
this RFC.

Since version 5.2 it’s possible to bind the size of pie charts to an
attribute (
PROCESSING "CHART_SIZE_RANGE=itemname minsize maxsize minval maxval"

This would also be useful for point symbols as simple diagrams without
slices or bars. The idea is to have a symbol, let’s say a filled circle or
square, which varies continuously in size. The size is bound to an attribute
for example the absolute number of habitants of different countries.

This would be a useful feature for thematic mapping. Is it possible to
implement this?

Best regards
Karsten Hoffmann

-----Ursprüngliche Nachricht-----
Von: mapserver-dev-bounces at
[mailto:mapserver-dev-bounces at] Im Auftrag von thomas bonfort
Gesendet: Donnerstag, 4. Dezember 2008 11:18
An: mapserver-dev Mailing List
Betreff: [mapserver-dev] RFC49: mapfile simplifications and


Not sure if the changes warrant a full blown RFC, but as there quite a
number of them I've regrouped them.

These changes are/were all in RFC45, but were extracted to keep things
moving on as some of the stuff in rfc45 lacks funding in the near

You can see it in action here on openstreetmap data:
nothing that's impossible to do with the current mapfile keywords
(except for polygon label placement, and thin lines thanks to
fractional size/widths), but the mapfile maintainance and creation is
greatly simplified, as e.g. roads are mostly defined with a single
class whatever the scale (using a combination of sizeunits at the
layer level, and min/max width and min/max scale at the style level)

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