[mapserver-users] Label size proportion to geometry size

[Steve Grey]

Jackey,

If it can't be achieved in Map Server settings, it might be possible to
accomplish if your data is in PostGIS and you can get your data from a
database function rather than a table/view as your data source.  In that
case, and if appropriate arguments can be sent to a PostGIS function, the
dynamic part can be taken care of as part of the select.  You'll then have
to optimise the speed/structure in the PostGIS side.

I have no idea if this might work!

Steve



On 13 April 2010 09:45, Jackey Cheung <cheung.jackey at gmail.com> wrote:

> Hi all,
>
> Say, I have two polygon in the same layer, and they are at the same logical
> group/level on the map. Means that both feature should be drawn and labeled
> at the same scale. However, one polygon is much larger than (say 10 times
> larger) than the other. Currently, I let MapServer to handle the scaling
> automatically, so that in a display scale, the label of the larger one looks
> too small while the larger one looks gigantic.
>
> My thought is straight forward: tie the font size to the size of the
> polygon. However, since the label must be scaled with respect to the map
> display scale, it has to be dynamic; further, since they belongs to the same
> logical group, they'll eventually be in the same size when zoomed in enough.
> My first thought is to bind the MINSIZE to a data attribute, so that they
> start with different font sizes and eventually scaled to the same MAXSIZE.
> But the MINSIZE/MAXSIZE cannot be used in this way.
>
> Any suggestions?
>
> P.S. I'm not using mapscript, just map file.
>
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